gymguy

Hello everyone been looking in the forum and found one topic that is the same problem with no answer, and that was 2 years ago. I have a 99 grandam gt with about 94,000 miles if i start it up cold its fine but if i drive it for 15 or more minutes (like going to the store or getting gas) and turn it off when i go to restart it it starts then almost always stalls. Sometimes it will stay started but my rpm will be bouncing all over the place from around 400 to 900. If i hold my foot on the gas about half way down it starts up always just my rpm is up there.Any help would be great, thanks everyone.

GTP Dad

Welcome to AF!!

There are a couple of possible solutions. First, check the fuel pressure on the car when cold and then hot. I suspect you either have a problem with the fuel pressure due to a bad regulator or you have a problem with the fuel pump itself. One of the first places to start is with the fuel filter. Make sure it is new especially if you haven't changed it in a long time.

The other possibility is a problem with the ignition module overheating. The could cause the issue with the rpm's but I think you will find a problem with the fuel pressure is the true issue.

gymguy

Thanks for the welcome. I have just changed the fuel filter when i did my last oil change and air filter.I'll look into the fuel pressure. How do i check the pressure, is this something i should have the shop do? Thanks for the input.

Gir-_-

yea most shops are going to be ABLE to do it, its just a pain in the butt in yours ... namely price being an issue

__________________
99' GRAND AM SE V6H.O. 188fwhp and climbing!

jeffk388

This may be a temporay trick. I think it happens either due to leaking injectors or bad pressure regulator. When you drive it and park on a warm day, the temperature in the engine room is very high and this heat make the fuel in the fuel rail vaporied if the fuel pressure is not kept high enough due to bad part(s). If the fuel in the rail is mixture of liquid and vapor, the actully injected feul into a cylinder could varys injection-to-injection and/or cyl-to-cyl. This may lead to engine stall. When this happen again, try to cool down the rail by spraying some water. Avoid spraying cold water on hot parts like engine block or cyliner head.

tipzy

Hi! I just bought a 99 grand am GT about a month ago. It currently has 107k miles on it. I am having the same exact problem. I start the car and it's fine, but it does not like to be started and shut off and then restarted. It has stalled on me a few times, and other times it just won't start for me. I was starting to think my car just hated me.

I'm afraid it is the fuel pump. We replaced the fuel filter when I noted I was having problems, and after the first stall, I got a service engine soon light.

so I replaced the co detector. Unfortunately, it did not solve the problem. My friend has one of those crazy contraptions to find the code on the service engine soon light, and it happened to be like co detector. This car has pretty much OEM everything... like I bought it at 106k and it had the original air filter. My air condensor works, but makes a terrible nose when it's not running, so I always have it running.

I think it is the fuel pump because my gas gauge does not always work. Sometimes I will be driving and it will randomly beep at me that I have no gas. And I'm like hello I just filled you up yesterday.

I thought it was dirty injectors. I ran some of that cleaner out, because I am starting to have rough idling, too.

I am kind of limited budget wise, considering that I just bought it and I'm paying it off, so I am really, really hoping it isn't the fuel pump.

IF it is, does it really cause any problems? Other than the occasional annoyance of it not starting?

Oh yeah, it I turn the key long enough, sometimes it will start, it just sounds like it's not happy with that. And other times, if I push the gas pedal down, it'll catch, but just barely.

Othertimes I start my car and it pulls my car forward. It's strange, really.