righto, i've had this up before but nothing seems to have worked.

 

It started about 50miles after a spin off with no impact damage to anything further forward than the doors(no fuel lines crimped). thought may be completly nonrelated.

 

It just didnt want to accelerate, put-put-putting under power.

took it home and tried it a couple of days later and all seemed well untill after about 50 miles it started to do the same, but not as bad as before, could still accelerate but only gently.

Went out in it a couple of other times and it was on the whole fine (mabe a single misfire once evry now and again)untill...

i was out in it most of the day without many problems and got into town and it would barely manage to pull away from a set of lights or up a hill.

Took it home. Left it to cool (2hours max) and it was fine untill it got hot, now it has started to do it as soon as it is warm.

 

i have changed the oil, all filters (air, oil and fuel), spark plugs, cleaned the temp sensor (little yellow plug at center front) and changed the coil pack plugs as these were brittle and shaking loose. I have also put a new exhaust, cats back, on since if it makes any difference.

 

now it all goes a little over my head with injectors and god knows what else that may be wrong. However as it only seems to happen under full throttle and when warm which would suggest to me some sort of sensory fault. Possibly one of the coil packs is caput, how would i go about checking this and what is the likleyhood?

 

please help as this has me on my knees close to tears:headvswal

 

also if anybody knows a good garage for 300s in edinbugh as the one listed's knoledge of the car was, no offence, thouroughly pants.

 

Cheers, Jamie.

Edited July 29, 200817 yr by chunder

sorry, forgot to add there is white smoke coming out of mainly the driver's side exhaust for a couple of mins on a cold start, i know its fairly common and probably ok but don't know it it has any relevance.

Hi mate, if you have posted this up before can you link us to the thread or at least tell us what you have tried.

 

My first impression is Series 1 ptu. If you haven't tried this already swap your ptu over for another one if that works invest some money into a series two ptu.

 

If not then try cleaning or replacing your temp sensor.

 

The symptoms fit both of these solutions.

I would guess a faulty coilpack - have seen this before. Blag another one and swap it around each in turn, hopefully the problem will disappear when you find the right one.

Hi mate, if you have posted this up before can you link us to the thread or at least tell us what you have tried.

 

My first impression is Series 1 ptu. If you haven't tried this already swap your ptu over for another one if that works invest some money into a series two ptu.

 

If not then try cleaning or replacing your temp sensor.

 

The symptoms fit both of these solutions.

 

right, there is a wee bit on these two

 

http://www.300zx.co.uk/forums/showthread.php?t=112281&page=2

 

 

and the other one dosn't seem to want to hiper link but there is nothing of any use there (search "missfires and spoilers" by chunder" if you realy want to see it

 

 

as for what i have done

"i have changed the oil, all filters (air, oil and fuel), spark plugs, cleaned the temp sensor (little yellow plug at center front) and changed the coil pack plugs as these were brittle and shaking loose. I have also put a new exhaust, cats back, on since if it makes any difference"

 

 

will need to make some friends with zeds

nice one. Jamie.

ok where are you based mate, this may help as someone may be near you that some come over and take a look.

 

Might be worth getting it to cough and splutter, then pull over and unplug one coil pack at a time to see if the tone of the engine changes.

lovin' the reply speed!

 

i am based between Edinburgh and North Berwick, a wee toon called Haddington.

 

any assistance would be awsome! but in the mean time im not sure that taking the coil pack out at rest would show anything as it it fine at idle, only when it is being asked to nail it and sometimes just general acceleration (when it has been on the go for a while) will it misfire.

 

taa, also what is a stage 1 and 2 pcu and prices?

ptu not pcu

ptu not pcu

 

Take a flat bladed screwdriver and place it on the top of each injector, put your ear on the handle of the screwdriver and listen for the clicking sound to indicate the injector (engine running) is working, if no sound it could be a faulty injector (block your other ear to eliminate sound). I have about 12 coilpacks so if you can make it over to my house we could swap them about and try to eliminate this also. I also have 3 Series 1 PTU's so we could try them also to see if thats the prob. Try and find some one with a Datascan or Consult they could hook up to you car for a diagnostic.

 

taa, also what is a stage 1 and 2 pcu and prices?

 

Hi Jamie,

 

The PTU is the Power Transistor Unit and is located just to the right of the driver side throttle body (on the front of the cambelt cover). The PTU regulates the firing and frequency of firing of the coil packs. The Series 1 PTU is known to have problems (especially after being on the car for over 13 years ...) and is now commonly replaced with a Series 2 PTU. This is much more reliable. You won't be able to find a new Series 1 PTU but I do have one Series 2 PTU left in stock - price = £140 + £5.85 postage.

 

Based on the symptoms I've seen above I would suggest you try and change the coil packs first and then think of replacing the PTU for good measure and to eliminate any future problems.

 

HTH

 

Dan

Thanks Dan. Ill let you know if and when i need this to see if you still got it in stock.

 

BIGSSS; If that offer still stands that would be brilliant. My tax runs out by the end of the month so if i could pop round before that it would be perfect, if not, dosn't matter, ill have to renew at some point anyway. I don't have any commitments over the next couple of weeks i can't escape from ( can get out of work with minimal notice). So as i said, if you are still ok with it whenever would suit you!

 

ill put a shout up on for someone with a diognistic machine.

 

Smashing! jamie.

Thanks Dan. Ill let you know if and when i need this to see if you still got it in stock.

 

BIGSSS; If that offer still stands that would be brilliant. My tax runs out by the end of the month so if i could pop round before that it would be perfect, if not, dosn't matter, ill have to renew at some point anyway. I don't have any commitments over the next couple of weeks i can't escape from ( can get out of work with minimal notice). So as i said, if you are still ok with it whenever would suit you!

 

ill put a shout up on for someone with a diognistic machine.

 

Smashing! jamie.

 

I completely forgot about this lol, it was my anniverary yesterday so had a few beers.

Yes the offer is open anytime you want to swing by, just post up your number and i'll give you a bell as i can't PM you, or if you subscribe i'll be able to contact you and its worth while;)

I completely forgot about this lol, it was my anniverary yesterday so had a few beers.

Yes the offer is open anytime you want to swing by, just post up your number and i'll give you a bell as i can't PM you, or if you subscribe i'll be able to contact you and its worth while;)

 

haha, righto. ill try to get it done tomorrow as i need the pm function to get hold of the chap wth the data scan thingamy as well.

Up date:

 

ok things that it is not - temp sensor, injectors, faulty spark plugs, coil packs & plugs, ptu, ecu, afm, air/oil/fuel filters

 

The plugs/coils were & injectors have only been tested at idle but car is deffo running on all cylinders untill asked for full boost where all cylinders seem to fail and loads of fuel is dumped into the exhaust system and it goes 'pop'

 

 

please, please, please any suggestions?

 

anybody around the Lothians with a diognostic machine and a bit of spair time would be a massive help!

 

Also id like to extend my massive appreciation to BIGSSS who was awsome. Extremly generouse with his time, tools, experience and bits for the car. After spending alot of today fettling, swapping bits over we have at least eliminated a big stack of things. Top man!

 

nice one, Jamie.

Up date:

 

ok things that it is not - temp sensor, injectors, faulty spark plugs, coil packs & plugs, ptu, ecu, afm, air/oil/fuel filters

 

The plugs/coils were & injectors have only been tested at idle but car is deffo running on all cylinders untill asked for full boost where all cylinders seem to fail and loads of fuel is dumped into the exhaust system and it goes 'pop'

 

 

please, please, please any suggestions?

 

anybody around the Lothians with a diognostic machine and a bit of spair time would be a massive help!

 

Also id like to extend my massive appreciation to BIGSSS who was awsome. Extremly generouse with his time, tools, experience and bits for the car. After spending alot of today fettling, swapping bits over we have at least eliminated a big stack of things. Top man!

 

nice one, Jamie.

 

Glad to help out mate, anytime you need a hand just give me a shout.

The neighbours have been asking when your coming back lol.:mac1:

Could be a fault with the main engine harness but you would expect something to show up on idle too, have you checked the ecu for any fault codes ?

 

Have you checked for any boost leaks ???

Could be a fault with the main engine harness but you would expect something to show up on idle too, have you checked the ecu for any fault codes ?

 

Have you checked for any boost leaks ???

 

We tried the ECU from my car but it was still the same, hopefully Datascan will come up with something.

Fuel pressure regulator problem ?

Stupid question, but is the timing ok ?

 

 

Alan...........

Fuel pressure regulator problem ?

Stupid question, but is the timing ok ?

 

 

Alan...........

 

I said the same thing Alan about the timing. The car ran fine but its been sat idle for months. Also it drives fine in normal conditions but its only when you try to boot it a bit it seems like its missfiring, thats why i thought timing.

Could over fueling cause this as it does backfire when you put your foot down.

I would check the timing, just to be sure.

Had a Firebird that was way out on the timing and ran fine, until you gave it full throttle and then she was drowning in fuel !

 

Alan...........

I would check the timing, just to be sure.

Had a Firebird that was way out on the timing and ran fine, until you gave it full throttle and then she was drowning in fuel !

 

Alan...........

 

I think Berrica is going to check it out on the Conzult or Datascan for Jamie, i have Datascan but my lead is a serial connection and my laptop doesn't support it.

Should have called you first but your too busy with your yank friends lol.

Only kidding your still the man:duffer:

I think Berrica is going to check it out on the Conzult or Datascan for Jamie, i have Datascan but my lead is a serial connection and my laptop doesn't support it.

Should have called you first but your too busy with your yank friends lol.

Only kidding your still the man:duffer:

 

HeeHee,

Will bring the Maro over on open pipes and really let your neighbours ken I am there !!!

Any ways, this thread has been hi-jacked

 

I would check the timing is ok, Sounds like over fuelling ? Too much going in or not being burnt properly ?

Might even be a coil pack going AWOL when its warmed up ? Missed a meet at Falkirk Wheel with this problem. Would have thought if it was a faulty coil pack, it would illuminate the Cat over heat light ?

 

Alan.............

Did you check for fault codes on the ecu, not just replacing the ecu, could also be fuel pump giving up on longer runs and on higher demand

Did you check for fault codes on the ecu, not just replacing the ecu, could also be fuel pump giving up on longer runs and on higher demand

 

There's no LED in the ECU? Thats why we tried mine but still the same.

sticky valves or bad compression maybe ?. If you've tried averything else you should do a compression check.