Now then everyone, first of all i'm new to this forum and new to the world of the 300ZX, so let me excuse my lack of knowledge to start with (not a complete novice, pretty handy with spanners, hammers.. well especially hammers..)

 

The car i'm asking about is a 1993 TT Auto, with a few mods, including an apexi boost controller and afm enrichment, which I do not fully understand, but have a good idea of

 

I have searched and searched for this issue i'm having and so far drawn a blank. I've seen a few posts and threads that are similar, but none quite cutting the mustard.

 

The problem I have with mine is it will sometimes fire straight up but mainly it will take a good few seconds / a couple attempts of cranking before it actually fires. As far as I can see, the fuel pressure solenoid has been bypassed so I don't think that is the issue. A little lumpy when it first fires up, rough idle for a couple seconds, but once it is running it is fine, no misfires or anything. Pulls like it should and what not. It's more often than not cranking for a while before it roars into life. I can't work out if keeping my foot hard down on the go-faster pedal helps it start or not.

 

I've read all kinds of horror stories about replacing the CAS if that is faulty, like not getting it right and struggling to get it running again.

 

Any help / advise will be greatly appreciated . I haven't yet checked for codes, but shall be doing shortly

 

Cheers!

 

Eddie

Hi Eddie and welcome, I wouldn't think it would be CAS personally as then it would be a permanent problem not intermittent but I hope you find your answer.

Thanks Alic, I want to get it sorted as I have a feeling I will be somewhere far away with it and it won't start at all

Welcome to the club Eddie and hope you get it sorted.

As above, welcome.

First couple of questions, does the issue still exist when the motor is fully warmed up?

Or only when cold?

Edited October 24, 20169 yr by redwine300

Hello guys and thank you.

The problem is both when it is hot and cold

Cranking the engine over a few times before it runs is not a big issue is it?

I've heard many modified engines take a few turns to burst into life.

Best to get a zed friend to check it over if ur worried

Hello guys and thank you.

The problem is both when it is hot and cold

Yeah I'm just scared it will let me down one day. I agree yes it's not a huge issue. Also haven't got a print out on the power it's kicking out. Should find out really

Eddie, like many new z owners u buy it, but it needs a proper look over!

That means someone who knows about these beasts!

Get it to one if its a problem ! There is so much u can check & not be near!!

Hi Eddie have listed the important points and answered accordingly:

 

 

1) The car i'm asking about is a 1993 TT Auto, with a few mods, including an apexi boost controller and afm enrichment,

 

 

2) The problem I have with mine is it will sometimes fire straight up but mainly it will take a good few seconds / a couple attempts of cranking before it actually fires. + rough idle for a couple seconds, but once it is running it is fine, no misfires or anything.

 

 

3) As far as I can see, the fuel pressure solenoid has been bypassed so I don't think that is the issue.

.

 

4) I can't work out if keeping my foot hard down on the go-faster pedal helps it start or not.

 

5) I've read all kinds of horror stories about replacing the CAS if that is faulty, like not getting it right and struggling to get it running again.

 

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

 

1) The afm enrichment device is old hat these days and could have some impact on the problem your having, either way better to get rid and get a correct chip ( eprom ) fitted to work with the extra boost.

 

2) Many things of a service nature can contribute to poor starting, including spark plugs, air filters and air leaks

 

3) Fuel pressure solenoid missing is odd, could cause loss of pressure when switched off, requiring the fuel pressure to build when starting, saying that the fuel pump primes when ignition is switched on, would think about refitting the pressure regulator.

 

4) The engine should start with no need to touch the accelerator

 

5) Cas unit will not be the issue, and even so is easy to change and get timed up?

 

 

So I would start with some basis checks on vacuum pipes, plugs, fuel filter, air filter and timing, the set up you have sounds like an older tuning method, I would guess the chip in the ecu is standard and just using the enrichment device for addition fuel to match the extra turbo boost, well .....sort of.

 

Be better to get the ecu chipped and dump the AFM controller, all that does is crudely fool the ecu into adding fuel, does nothing for the timing, vvt or rev limit etc. also check the connections to the temperature sensor and afm as part of the basic checks.

 

The fuel regulator missing is an odd ball and would be replacing that and remove the afm enrichment device whilst turning the boost controller down or off until you get a better chip in there, needs checking out on a ConZult really, give Jimmer a call at Power Zed.

 

Jeff

Edited October 24, 20169 yr by JeffTT

And there Eddie u have it from a Z guru !

Hi welcome to the club. I had a similar problem for a couple of years, hard to start hot or cold it finally turned out to be the fuel pipes under the throttle cable in between throttle bodies had looked at them many times and never saw a leak until it got very bad.

Wow thanks Jeff, plenty for me to go at for the time being. I'm not sure if the chip is stock or not, it does rev to 8 thou if the loud pedal is flat knacker. Excuse my lack of knowledge, but what is a ConZult? Whatever it is, it sounds expensive!

 

Bones thank you I will also check those

Wow thanks Jeff, plenty for me to go at for the time being. I'm not sure if the chip is stock or not, it does rev to 8 thou if the loud pedal is flat knacker. Excuse my lack of knowledge, but what is a ConZult? Whatever it is, it sounds expensive!

 

Bones thank you I will also check those

Wow thanks Jeff, plenty for me to go at for the time being. I'm not sure if the chip is stock or not, it does rev to 8 thou if the loud pedal is flat knacker. Excuse my lack of knowledge, but what is a ConZult? Whatever it is, it sounds expensive!

 

Bones thank you I will also check those

You already posted that btw. The ConZult is the software/computer for scanning these car's ECUs and getting all fault codes and sensor information and what not. The cable is quite cheap on ebay but I don't know if it actually works properly or does what an actual conzult II is mean to do.

Where can I get the software for reading codes ect? I've done a few searches and trawled through Google, but not getting a certain answer. Don't want to be paying £250 for something I will hardly use

Where can I get the software for reading codes ect? I've done a few searches and trawled through Google, but not getting a certain answer. Don't want to be paying £250 for something I will hardly use

You don't need software do pull codes.

 

There is also this

http://m.ebay.co.uk/itm/New-14-Pin-Consult-II-OBD-DDL-Mini-USB-Diagnostics-Tool-For-Nissan-Z32-1989-2000-/281595813506?hash=item41906b1e82%3Ag%3A128AAOSwBahVeR5N&_trkparms=pageci%253A1d65aab6-9b5b-11e6-bc42-74dbd1800bbd%257Cparentrq%253A003b3c461580a2a405af841efff8eabd%257Ciid%253A1

But I have 0 idea if it actually works

Edited October 26, 20169 yr by Alic

The first link doesn't work i'm afraid Alic. Foe £15 I will chance the diagnostic tool + cd ect off fleabay. Will report back when I have done some tests, tinkering and what not.

 

Once again, thank you one and all for your help and guidance!

The first link doesn't work i'm afraid Alic. Foe £15 I will chance the diagnostic tool + cd ect off fleabay. Will report back when I have done some tests, tinkering and what not.

 

Once again, thank you one and all for your help and guidance!

Youre right, was on mobile and should have checked. This was it

Ahh yes. I had seen that, did question it abit when I saw it, but if it works it works

Ahh yes I had seen that. I did question it abit when I saw it at first, but hey if it works it works

Be careful taking tech advice from a 10 year old with access to Google, Eddie... ;)

 

If you fancy a run up to County Durham, I have the full Consult software here so we could plug your Zed in and see what's what.

Be careful taking tech advice from a 10 year old with access to Google, Eddie... ;)

 

If you fancy a run up to County Durham, I have the full Consult software here so we could plug your Zed in and see what's what.

Would you prefer if it came from JeffTT, because that's where the info came from.

 

Eddie I did some digging and came up with this from the ebay cable:

Comes with the free version of Nissan Consult which is limited but still useful. The full version doesn't cost much anyways.

Worked fine for me and has been helpful.

You can also load Nissan Datascan with it and it works.

Edited October 26, 20169 yr by Alic

Would you prefer if it came from JeffTT, because that's where the info came from.

 

In all honesty, I'd much prefer you leaving the tech advice to people who have knowledge regarding what they're talking about. :thumbup1:

In all honesty, I'd much prefer you leaving the tech advice to people who have knowledge regarding what they're talking about. :thumbup1:

Can you fault what ive added to this thread?