here is the result..

 

1. Diagnostics

Autobox OK

Engine :code 34 - det sensor cicuit (sensor or wiring)

Car running in safeboost mode

 

Both O2 sensors dead (no response)

 

Hicas Pump - lines dosed and leaking (needs investigation)

 

Coolant sniff test - Clear

 

Coolant sensor (Gauge) - inoperative

 

Coolant sensor (Ecu) - inoperative

 

Coolant - Needs flushed and replaced

 

Thermostat - replace

 

Waterpump - possible replacement needed

 

Coolant leak fron rear of engine - possible Hose (needs investigation)

 

Front Bumper - Wrong type fitted (N/A)

 

Engine oil leak front lower - possible FMS or Sump

 

Engine oil leak Rear - Possible Rear crankseal or Sump

 

Engine oil leak Nearside upper - possible turbo feed (investigate)

 

Exhaust system - Still running original system and Cats

(Blocked cats maybe causing possible restriction)

 

Body - Underseal required

 

Suspension - OK

 

How bad is this? is it even worth keeping the car?

How much am i looking in parts?

 

Please give me some advice i am so so crossed for buying a car like this!

All the sensor problems will most likley be connectors that have corroded and require cleaning, Code 34 requires the 1meg resister treatment, Check that your not detting first!! O2 sensors are a pig to change but clean the connector first, bad conections due to corrosion is very common.

 

Hope this helps

 

Allan

Thanks gruntpa64.

I most check that over the weekand but theres far more then just bad sensors and my mechanics knowledge is very limited thats why not to sure what to do coz a specialist will charge me a fortune to fix all this which unfortenly i can't pay :(

All the sensor problems will most likley be connectors that have corroded and require cleaning, Code 34 requires the 1meg resister treatment, Check that your not detting first!! O2 sensors are a pig to change but clean the connector first, bad conections due to corrosion is very common.

 

Hope this helps

 

Allan

try to fix it before going down the resister route!! as it might be the wiring to the dett sensor rather than the actual sensor....i too have this code with a new dett sensor fitted so will be checking the wiring asap...

here is the result..

 

1. Diagnostics

Autobox OK

Engine :code 34 - det sensor cicuit (sensor or wiring)

Car running in safeboost mode

 

Both O2 sensors dead (no response)

 

Hicas Pump - lines dosed and leaking (needs investigation)

 

Coolant sniff test - Clear

 

Coolant sensor (Gauge) - inoperative

 

Coolant sensor (Ecu) - inoperative

 

Coolant - Needs flushed and replaced

 

Thermostat - replace

 

Waterpump - possible replacement needed

 

Coolant leak fron rear of engine - possible Hose (needs investigation)

 

Front Bumper - Wrong type fitted (N/A)

 

Engine oil leak front lower - possible FMS or Sump

 

Engine oil leak Rear - Possible Rear crankseal or Sump

 

Engine oil leak Nearside upper - possible turbo feed (investigate)

 

Exhaust system - Still running original system and Cats

(Blocked cats maybe causing possible restriction)

 

Body - Underseal required

 

Suspension - OK

 

How bad is this? is it even worth keeping the car?

How much am i looking in parts?

 

Please give me some advice i am so so crossed for buying a car like this!

 

the main probs seem to be the oil leaks! there gonna be the worst to fix imho...not sure but think its engine out job!!! which isnt as bad as it sounds if you got the tools ?

thats the problem mate i dont have the tools and even if i want to sell it the way it is nobody will touch it.

the thing is, is it worth fix it?

Im not an expert at all but from the list i can see at list £1500 to fix it or maybe im wrong?

I dont know im so fustrated i cant even think straight mate :(

1. Diagnostics

Autobox OK

Engine :code 34 - det sensor cicuit (sensor or wiring)

Car running in safeboost mode

 

= If DET sensor is shorting / not responding then your car will go into safety boost as grumpa says. Clean the connectors

 

Both O2 sensors dead (no response)

 

= Try cleaning the connectors or you can buy some universal ones from ebay very cheap!!Click Here

 

Hicas Pump - lines dosed and leaking (needs investigation)

 

= Get rid of it, get an hicas removal kit from drift works or something, its not worth the hassive in my opinion of repairing... Click Here

 

Coolant sniff test - Clear

 

Coolant sensor (Gauge) - inoperative & Coolant sensor (Ecu) - inoperative

 

= Im not sure on this one... new thermal sensor? (guys correct me if im wrong!)

 

Thermostat - replace

 

= Use Traders on this Forum, they will be able to acquire you the parts needed

 

Waterpump - possible replacement needed

 

= You should really get a service done when replacing the water pump, it comes with the 60K and the 120K service kit. Both traders can supply it for you!

 

Coolant leak fron rear of engine - possible Hose (needs investigation)

 

= Check all hoses, might be an engine out as some pipes (i believe) are hidden near the back and are too hard to get to.

 

Front Bumper - Wrong type fitted (N/A)

 

= There are penty of breaks are this forum who are breaking 300zx's at the moment, look in the for sale posts!

 

Engine oil leak front lower - possible FMS or Sump

 

Engine oil leak Rear - Possible Rear crankseal or Sump

 

Engine oil leak Nearside upper - possible turbo feed (investigate)

 

Exhaust system - Still running original system and Cats

(Blocked cats maybe causing possible restriction)

 

= Get a replacement exhaust, be careful thou as when you change the back pressure you can blow out the turbo seals = replacement turbo seals = engine out job and the need to recondition the turbo's!!

 

Im no way an expert or even good at fixing these cars, that's only my advice above. There will be pros along soon to help you out!

thats the problem mate i dont have the tools and even if i want to sell it the way it is nobody will touch it.

the thing is, is it worth fix it?

Im not an expert at all but from the list i can see at list £1500 to fix it or maybe im wrong?

I dont know im so fustrated i cant even think straight mate :(

 

think your right about the price, cos if a good zed garrage done it they would do a full 60k service while the engine was out & seeing as u need a new stat & water pump your half way there!!!

 

it boils down to how much the car is worth when its all done?...

is the car in good condition apart from the engine probs,?

is it worth spending money on this car or break it & buy another one,?

 

we just rebuilt my tt engine but the car only cost £700 so it was worth it

& including buying the car along with the rebuild & some other bits eg bodykit etc the car still only stands me at £1300 to date!

so if you got your car cheap it might be worth it????

Code 34 is not faulty det sensor, it is a harness fault.

Code 34 is not faulty det sensor, it is a harness fault.

 

I thought the definition was "detonation sensor circuit" as in it could be either - in fact it must be, as the ecu has no way of knowing whether it's the loom or sensor that's open/ faulty.

Code 34 is not faulty det sensor, it is a harness fault.

 

ECU cant get a reading from the det sensor so it means either the Harness or the Sensor itself.

well murt i have to say you got a good deal..

I got mine 4 weeks ago and only had a proper drive since then.

mine was double the price of yours and spending that amount again will make it a 3k car which nobody will give me if ever want to sell.

I knew i would have to spend money on her but no this much at a time you know.

I would really like an opinion form jeff (zedworld)

thanks very much for the posts its nearly making me consider but still not convinced its worth the hassle.

i serviced the car,well just the basics not a full 60k service coz i wouldnt know where to start but at list a few things are done already,bumper arrived today,have put it £300 EBC brakes and pads and if i sell the car as it is i wont make the 600 i already put in it plus would feel really guilt for selling it as it is..

anyway ill try my best to try and save the zed..

here is the result..

 

1. Diagnostics

Autobox OK

Engine :code 34 - det sensor cicuit (sensor or wiring)

Car running in safeboost mode

Replacement Sensor and Loom - Budget for £300 to replace or £1 to bypass.

 

Lots of info on bypassing for pros and cons - search forum

 

Both O2 sensors dead (no response)

Ignore that for the minute, as the det sensor and no coolant temp sensor reading will be making it extremely rich, so the sensors may be sitting there showing a full rich reading. Check them again after other faults fixed.

Hicas Pump - lines dosed and leaking (needs investigation)

Coolant sniff test - Clear

 

Coolant sensor (Gauge) - inoperative

 

Coolant sensor (Ecu) - inoperative

Check the 2 connectors on the top water pipe between the radiator and engine. Left is ECU temp sender, right is gauge temp sender. The connectors themselves are probably corroded/dirty. Clean them and file away any corrosion. Then check again

 

If it is sensors then they are about £30

Coolant - Needs flushed and replaced

 

Thermostat - replace

 

Waterpump - possible replacement needed

Have a 60k service done which will replace cambelt, waterpump and thermostats - £500'ish from a Zed specialist

Coolant leak fron rear of engine - possible Hose (needs investigation)

Front Bumper - Wrong type fitted (N/A)

TT bumper - £50 2nd hand + delivery from Z breakers

Engine oil leak front lower - possible FMS or Sump

Can be done at same time as 60k service

Engine oil leak Rear - Possible Rear crankseal or Sump

Gearbox off to replace unfortunatly. £15 part, £200 labour

Engine oil leak Nearside upper - possible turbo feed (investigate)

Relatively simple for a garage to fix - oil feed either needs tightening or replacing. Could potentially be rocker cover gaskets though, which is a plenum off job so about £200-£300 labour if it is that.

Body - Underseal required

They are undersealed as standard, but that can get chipped/scratched away in places over time. You could do it yourself with a £10 can of underseal

Suspension - OK

How bad is this? is it even worth keeping the car?

How much am i looking in parts?

 

Please give me some advice i am so so crossed for buying a car like this!

I would say your looking at about £700-£1000 for a garage to do all the work for you. If you want to get your own hands dirty then maybe a couple of hundred in parts and a weekend working on her.

 

None of the problems are unusual, most zed's will have to have all of the above done at some point, and these problems are very typical of a lot of poorly maintained lower price Z's out there unfortunatly.

 

I guess you need to decide wether the car is worth it personally to you.

Edited February 6, 200916 yr by Yowser

I really hope you get your car sorted without to much fuss but unfortunately this is the problem with buying these cars on the cheap as there is nothing cheap about them. It's false economy, save up and buy one thats had all the work done, full history etc, especially at the prices they are at the moment. I've lost count of the amount of new owners coming on the site saying 'I've just bought a 300ZX as a project, it needs a bit of work but I got it cheap'. Two months down the line they've sold up and are well out of pocket.

Thanks Legrath that as helped me alot.

I will try do most of it myself think i will take a chance and fix it and hope she goes on well after.

If it was for me i would fix it all in a garage but the pressure at home is bad (misses) she doesnt fancy the money spent on cars lol..

sorry to hear your zed needs a lot of work my only advice is bite the bullit and get it fixed even spread the work out to minimise a big bill or sell it on and take the financial loss like Glen said these are high performance cars and need proper and regular servises any bought cheaply with problems can be a false economy so many of these cars are being broken for parts because owners can not put the money into fixing them. I hope you can get your zed sorted at least when all the work is finished you should have a well sorted zed which will give you a lot of pleasure to drive, good luck and keep us posted on your zed.

Hello, right first the assessment in my view is incomplete in its detail and for this reason you are second guessing many "fault issues" a shame because an assesment should give you the answers not just pose more questions.

 

Many of the guys here are on the right track and as Legrath explained justifying any repair cost is up to how you value the car personally not in ££££sss.

 

Right looking at what we from the "assessment" I believe you have a set of faults that may well have a single cause, this has mudded the water a little and is often the case with wiring/ connection issues.

 

The following items 1 to 4 have common return earth shielding and although I would be fairly certain no 1 the det sensor circuit is at fault, the following items are highly unlikely to all have individial faults this is most likely a problem with the aformentioned earth shielding been damaged and leading to cross sensor faults on 2, 3 & 4

 

1)Engine :code 34 - det sensor

 

2)Both O2 sensors dead (no response)

3)Coolant sensor (Gauge) - inoperative

4)Coolant sensor (Ecu) - inoperative

 

5)Engine oil leak front lower - possible FMS or Sump

 

6)Engine oil leak Rear - Possible Rear crankseal or Sump

7)Engine oil leak Nearside upper - possible turbo feed

 

8)Exhaust system - (Blocked cats maybe causing possible restriction)

 

9)Body - Underseal required

 

10)Hicas Pump - lines leaking

 

Service items

Coolant - Needs flushed and replaced

Thermostat - replace

Waterpump - possible replacement needed

Coolant leak front rear of engine - possible Hose (needs investigation)

 

........................................................................................................

 

Oil leaks, yes well they are less than desirable but not the end of the world,

 

No 5 Most likely is connected with the leaking steering pipe from the steering pump and in fact are most likely from the same source ie the high pressue steering pipe, confused for engine oil is common as although power steering fluid is cherry red by the time its splashed around dirty undertray etc it looks like oil, high pressue pipe easy to change and more cost effective to replace with rebuilt item rather than a new one from Nissan dealer

 

No 6 rear cranks seal, very likely this is one item correctly assessed, saying that its dead easy to see!

 

No 7 Turbo oil pipe leaking...well most likely not as said by Legrath the rocker covers are the likely culprit with the oil running down on to the turbo / manifold area, although a large amount of stripping is required to replace the sealant on the outer covers its easy enough and some other worth while jobs can be done at the same time such as plenum water by pass and maybe the det sensor so with all those cross over jobs it could be quite cost effective.

 

No 8 Exhausts blocked, highly unlikely,often used as a sales technique to sell exhausts!

 

No 9 a tin of underseal repair paint and a brush...easy.

 

No10 See No 5

 

The remaining items you listed are service issues that would be covered by a cambelt and pump swap....easy.

 

There is nothing of major worries with the list, granted it lookes daunting but the slight mis-diagnosis has added to that.

 

Well good luck with whatever you decide, maybe time to subscribe and get the fuller benefits of the club such as free specialist assessments:rolleyes:

 

 

Jeff TT

Edited February 6, 200916 yr by JeffTT

not to mention the satisfaction of a solid car at the end of it

well that was magic to read jeffTT if that dont deserve a drink i dont know what does well done you!:duffer:

 

dan.:D

Jeff and Legrath very appreciated for your attention.

Jeff, how do you find time to work on Zeds when your on here giving advise??

 

Your a legend fella! :bow:

I think JEff and Legrath give excellent advice as always :bow:

 

I'm not mechanic but I can say the following with certainty - when you are not an expert you can sometimes over react to what in reality are not huge issues. On one of my cars, the power steering went, made a roaring noise and became heavy. There was oil everywhere. I thought the pump was knackered until I really investigated it. Filled it with AT oil and tested it. Just a loose pipe with a damaged rubber o-ring seal. 20cent repair job. So sometimes you see a list and you think, Christ what have I done? Am I a lamb that is just after getting slaughtered by E-Bay? It mightn't be that bad, but that said, these things cost money to maintain. Its an aging high performance sports car after all. Clarkson said once about maintaining a Lambourghini was like trying to feed an elephant with a serious cocaine habit. I think the original phrase might have been about a Zed instead of Lambourghini :)

 

The main question I would have for you, and I think it was touched upon by others is - considering how you feel now, can you grow to love that particular car? If the answer to that is price dependant, get a quote on getting everything tidied up by an expert and decide then. If the answer is no, then cut your losses and get shot of it, because no matter what you do, the minute something else goes wrong even something minor like a light bulb, the old memories of the pain suffered will flood back in. At least it did with me and a Merc that my wife had. There are some really good cars for sale through this club from members and owners who have looked after them. Use the proceeds from the sale against one of those.

 

I hope that bit of non technical advice helps

thanks chayden advice more then welcome.

to be honest with you i just want to sell it and buy a proper one so if i can get the money i already put in it ill be soon looking for a good one coz this one still as loads of original parts that soon will need replace like turbos for example the car as 78k and i believe it never was serviced properly apart from springs and cam belt plus all the rest i done so sell it is safer option so i will fix what i can and end of the story :(

Jeff, how do you find time to work on Zeds when your on here giving advise??

 

Your a legend fella! :bow:

 

 

 

Oh its all smoke and mirrors my friend :D

 

Jeff TT

Hello,

 

Im Marty, and its been many many moons from I was a member on this site.

I had a quick look over Nelsons car as someone here recommended me, even though Its been a few years from Ive worked on Z's. (Tulip if shes still around?) and i done it as a favour, unfortunately i have seen so many dogs in this part of the land its been heart breaking.

 

Unfortunately with falling prices, these cars have been passing hands from Non enthusiast to non enthusiast, people who dont realise they are still a supercar and hence need the care, attention and proper maintenance that a 300zx needs.

 

Again thanks to the traders for commenting, but id like to make a few things on the list a little more clear.

 

O2 Sesnors showed very very little activity at 1500rpms, there was activity but not enough activity so i pronounced them dead

 

ECU coolant temp read a constant 55 degrees with car hot or cold, resistance test failed on the sensor so i pronounced it dead

 

Gauge temp sensor - Although wiring bad, sensor is connection physically damaged internally

 

Oil leaks - Well the sump has been off the car, it had be damaged to the front nearside and had been rewelded. This could be the subject of leaks if it wasnt replaced correctly, but that does not rule out Front seal, until that is inspected.

 

Rear could be also the above, but as the rear seal is common we cant rule that out.

 

Turbo feed is wet, hence why i marked as furthur investigation

 

High pressure line IS leaking around pump area

 

Rear of bulk head - brown coolant stained, lower area of Heater pipes Brown stained

 

Cats - yes, i have seen blocked cats on 300zx's which inturn effected the turbo performance. I advised Nelson NOT TO FIT decats or even an exhaust system as the Turbos are the Original units and with the cars milage

this could lead to premature failure off the seals.

 

As said, i dont work on 300zx's anymore, and Have advised Nelson to sit down and decide if this car is for him. It will require work which he could carry out himself. I have pointed him in the Direction of traders such as

 

Paul at SWZ and

Smithy

 

if they are still around as a source of parts and that there are plently of guides and online help out there on the Net for the DIY'er.

 

I also advised him to sell, and consider spending a little extra on car which has been owned by a club member/enthusiast on this site, where he can check a bit on the history off the car/owner and maybe get himself a car he will enjoy owning and Driving.

 

Again, nice to pop back to the club, and as said, im a trader and looked at this car as a favour as i know nobody over here knows them, i didnt try and sell or recommend anything that wasnt needed, i give the owner practical non biased advice, and recommended the Traders on here any future business that Nelson may give if he decides to keep the car.

 

Marty

the main question i would have for you, and i think it was touched upon by others is - considering how you feel now, can you grow to love that particular car? If the answer to that is price dependant, get a quote on getting everything tidied up by an expert and decide then. If the answer is no, then cut your losses and get shot of it, because no matter what you do, the minute something else goes wrong even something minor like a light bulb, the old memories of the pain suffered will flood back in. At least it did with me and a merc that my wife had. There are some really good cars for sale through this club from members and owners who have looked after them. Use the proceeds from the sale against one of those.

 

I hope that bit of non technical advice helps

 

 

Now who is been the clever boy !! that is by far the best non technical reply/ answer I have read that covers the very essence of 300zx repair decisions both upbeat and detailed in approach but still firmly grounded advice.

 

I wish I had written that!! nice one chayden :bow:

 

Jeff TT