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Old 10-30-2008, 06:22 PM   #1
SionGrey66
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Cold start issues

Background: 98 GST, stock turbo (no shaftplay), bolt ons. Timing is dead on, no boost leaks.

The car has been having some issues starting on cold mornings. However, this ONLY happens when you let it sit overnight. If you start it and let it idle, shut if off, and try to turn it on it turns on just fine (even if its 5 degrees out.) Similarly, if it sits overnight but its warm in the morning (above 40) it still starts just fine. The issue arises when it sits overnight and its cold outside. The car cranks just fine but never seem to catch just right, it tries to turn on but it dies. You can get it to stay alive with the gas and after a few seconds, it acts fine. If you don't give it gas though it dies. Even with no gas, if you start it a few times (3-4 times) it is eventually able to catch itself and acts fine. Other than this issue, the car runs flawless.

I'm assuming its one of two things: Spark or fuel. I think the spark is fine (new NGK 6's, NGK wires, plugs gapped correctly, coils test fine) so i'm assuming its the fuel. My first thought is the fuel filter, i'll be replacing it this weekend.

Any thoughts on what it could be? Any help is greatly apreciated.
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Old 10-30-2008, 10:12 PM   #2
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Re: Cold start issues

coolant temp sensor.
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Old 10-30-2008, 10:19 PM   #3
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Re: Cold start issues

It's a bit early for this comment, but if after everything you still can't find the cause of the problem, get a heat gun and warm up a section of the engine bay every morning you know it's going to have this problem. That should be able to help you narrow down where the problem is coming from.

I'm going to guess the IAC.
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Old 10-30-2008, 10:22 PM   #4
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Re: Cold start issues

The IAC is not going to cause this. But a faulty coolant temp sensor will.
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Old 10-31-2008, 07:20 AM   #5
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Re: Cold start issues

I have the exact same issue with my 1.8. I too suspect fuel or spark. Its not my coolant temp sensor because I'm on my 3rd one

Its cheap enough for you to try tho... Like I said: I tried 3.
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Old 10-31-2008, 08:36 PM   #6
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Re: Cold start issues

Coolant temp sensor? I have logged coolant temps many times (recently) and it all looks normal, nothing abnormal. I'm assuming as long as it outputs normal temp. signals then it should not be a problem.

I'm swapping fuel filters tomorrow morning, i'll update then.
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Old 11-02-2008, 08:34 PM   #7
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Re: Cold start issues

Update: I replaced the filter on saturday but did not get to drive until today. So, the issue is still there as far as I can tell, the car had a very hard start today. However, it was not very cold out at all (probably low 50's) so its possible the hard start was because I had to relive the fuel pressure saturday for the filter install.

Either way though, I'm wondering if it is possible for the coolant temp sensor to be bad if you can still read the temp. from a datalogger. I checked on my logger and the temps show up fine, the coolant temps start in the 40's on a day like today and go up as the car heats up. I'm assuming if the temperatures are normal then it should not be a problem, correct?
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Old 11-03-2008, 09:03 AM   #8
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Re: Cold start issues

Did you check your fuel injectors, or fuel rail it might be loose. Or the throttle body.
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Old 11-03-2008, 09:45 AM   #9
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Re: Cold start issues

How would a loose throttle body/injectors/rail cause a ONLY cold start issue? I would assume those would cause issues constantly, not only when its cold.

To answer your question though, throttle body has been cleaned, fuel injectors/rail are stock with new o-rings on the injectors. Everythings in tight, car runs 100% other than the cold start issue.
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Old 11-03-2008, 01:51 PM   #10
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Re: Cold start issues

You may have too cold of a plug..im not sure if you specified what you are using..i had a similar problem..i was using platinum plugs that were too cold of a heat range..cold startups sucked..i replaced them with a hotter plug and the startup issue is non existent..
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Old 11-04-2008, 05:41 AM   #11
SionGrey66
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Re: Cold start issues

NGK 6's, i'm on the stock turbo so there's no point to use the 7's. They're gapped correctly as well.
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Old 11-04-2008, 09:54 AM   #12
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Re: Cold start issues

hmm. have you checked the small inlline filter? by the driver rear wheel?
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Old 11-04-2008, 01:35 PM   #13
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Re: Cold start issues

I live in montana, and I just got my 95 gsx this summer. I too have noticed on the couple really cold mornings we have had that I had to almost floor my gas and it seemed as if it were running on 1 or two cylinders for a few seconds. Then it ran fine after the initial hickuping.
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Old 11-04-2008, 05:07 PM   #14
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Re: Cold start issues

Yup Velcro, it's exactly the same situation. It did this last year but on the very cold days it was just a rough start. It got worse and worse throughout the winter but stopped as soon as it got warm so I didn't worry too much. This year though, it started bad and has just gotten much worse.
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Old 11-04-2008, 08:45 PM   #15
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Re: Cold start issues

Hey mine had similar issues and it turned out to be the idle speed contoller, when they fail it makes it hard to start and causes ecu failure. Hope this helps you.
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