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noobie. 1999 grand prix gtp hard to start issues. Need help!!!!!!!

C

curticra

New member
Hello all,
I am rather new to the post. I have visited a few times over the years and found all of you to be very educated about the scenarios that come up which helped me fix my issues. I have had this car for 12yrs (has 150k) and have always kept everything in tip top shape.
My issues is a doozie and I need some help because I am at lost. Dealership(s) have no idea


Issue:
car starts up fine when cold or sits overnight. When I drive it for a while and then immediately start again it fires right up. When I drive for 20 mins or longer and then let it sit and try to start I have to crank it for a long while to get it to start and it stutters for few seconds then idles back to normal. Exhaust is really rich fuel smell. Once running it runs great. In the past year had tune up/spark plugs, fuel filter, MAF, fuel pressure regulator, Tbi cleaned. Tried seafoam to help clean as well.
I travel a lot for work so took to the dealership while out of town back in Oct and they had off and on for 2 weeks. they did fuel pressure test a dozen times, spark test and gosh knows what else. Dealership was able to reproduce the problem and said believe to be the fuel pump so replaced fuel pump, but still same problem. I don't have tools to do my own test nor time right now. I am thinking it is temp related since fires up on cold start but when engine sits but still warm it requires a lot to turn over. Could it be the temp coolant sensor? Other note is have had remote start on the car for 8 years and always started up but now it won't turn over. Could it be the crank shaft sensor? Need help!!!!!!!!!!!!!!!!!
 


Sorry for the delay. I didn't drive car enough over the holidays to put up posts with a yes it worked or no it didn't till now. I did install the Idle air control valve and didn't appear to fix the problem. Still hard to start after been driving for a while and then when try and start again have to crank it for a while to start. Any other ideas?
To recap dealership did fuel pressure test a dozen times, spark test and gosh knows what else. Dealership was able to reproduce the problem and said believe to be the fuel pump so replaced fuel pump, but still same problem. I don't have tools to do my own test nor time right now. MAF was replaced, fuel pump. spark plugs/wires done, fuel pressure regulator, fuel filter, tbi cleaned
 
what I did do while home for the holidays was go down the garage and cold start the car each day several times for 4 days (live in MA where it is cold right now). It started right up each time. Remote start worked perfect too.
When I drive it it runs beautiful just not when driven and then let sit for a while and try and restart.
 
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