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z31 Turbo needs help


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#1 Chris Laswell

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Posted 26 October 2014 - 03:01 PM

I have an 87 300zx turbo that is having some running problems, I'm not sure if it is all related or not. 

 

Cold Starts:

Cranks over, fires a few cylinders, then dies. This will repeat for a few times but eventually it'll start then keep on running. 

 

Once running/warm starts:

hesitation/misfire all over the rpm range. 

 

I thought the problem was ignition, so I replaced the cap,rotor,wires,and plugs. Didn't Fix the problem. 

 

Anyone have Ideas?

 

 



#2 NewZed

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Posted 26 October 2014 - 03:49 PM

Give some history on the car.  It could be an old turd that's been sitting for 12 years, or a daily driver that ran perfectly until you started having problems.

 

Vacuum leaks fit the second symptom.  FPR or fuel pump leaking down, the first.



#3 G-E

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Posted 26 October 2014 - 09:56 PM

First thing is CHTS... changing cold/warm it's likely the culprit.



#4 Chris Laswell

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Posted 27 October 2014 - 03:49 AM

update.... now the car won't even run. I tried starting it this morning and it'll just fire on a few cylinders then quit.

 

I can hear the pump prime the system when the ignition is on, and also keep on running for a few seconds after the engine dies. 

 

History:

had it for about a week now. bought it off of a guy who didn't  know much about cars. Problems were the same with him. 

 

I'm going to check the fuel pressure/ filter and rail and see whats going on. I'm thinking that it primes the system, runs, fuel pressure drops, then it dies.... sound logical?



#5 Chris Laswell

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Posted 27 October 2014 - 12:31 PM

Update: found out that the problem was the MAF. I'm still going to text all injector OHMS and see if I can find the source to the misfire that still persists. 



#6 NewZed

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Posted 27 October 2014 - 12:58 PM

1987 has self-diagnostics with trouble codes.  Pretty easy and might hep.  EFEC.

 

http://www.nicoclub....service-manuals



#7 G-E

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Posted 27 October 2014 - 02:06 PM

While you're at it, check/adjust the TPS, and your injectors should all be about 2.4-2.6ohm.



#8 85zxt

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Posted 16 September 2015 - 01:01 PM

Replace the Chts and it's harness - use Nissan parts - had similar problem - replaced the harness $23 - $37 for the chts - Courtesy Nissan lists these in their popular parts section on their site. + shipping/handling. 


If it ain't broke give it time!





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