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.
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.
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.
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?
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..
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.
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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