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2002 Pontiac Grand Am won't start when hot
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mboucher1978 Offline
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Post: #1
2002 Pontiac Grand Am won't start when hot
I have a 2002 pontiac grand am. I have recently started to have a problem with it starting when it has run for awhile. It starts fine when it has sat for awhile. But if we stop for a few minutes and need to start it back up again, it does not want to start. we have to keep trying to hear the fuel pump turn on before it will actually start. We have changed the battery and the fuel filter. We have also checked the relays for the fuel pump. Could this be a fuel pump problem? or is there something else we should be looking at.
03-21-2006 08:54 PM
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re-tired Offline
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Post: #2
 
verify spark at ends of plug wires . if ok verify fuel press using fuel press gauge that your gonna buy. let us know results.

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03-21-2006 11:45 PM
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mboucher1978 Offline
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Post: #3
 
the spark plugs have spark and there is fuel pressure getting to the engine. we are thinking it might be the coolant temperature sensor.
03-22-2006 09:34 PM
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mboucher1978 Offline
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we replaced the temperature sensor and that was not it. so we took the car to the dealer to do a diagnostic test and they found nothing in the computer. now the cooling fan works once in awhile but it doesn't work all the time. any ideas?
04-08-2006 06:40 PM
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Flexo Offline
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Post: #5
 
there are some p0200 codes in obd11 that relate to the fuel pump but your dealer didn't find any ,,so why not try changing the fuel pump relay and see if thats it. sounds like an elec prob, to me and the relay is a prime suspect.
04-08-2006 07:59 PM
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mboucher1978 Offline
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Post: #6
 
we replaced the fuel pump relay and that didn't change anything. I drove the car to work this morning and it ran fine. when i went out after work to start it up, it sill not start up now. you can not even hear the fuel pump turn on. it try's to, but it groans. now we are not sure what is going on.
04-10-2006 08:51 PM
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Flexo Offline
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Post: #7
 
I suggest you get you a spray can of starting fluid. The next time the car gives you this trouble open the hood and spray some down its throat. If you get any kind of a pop at all then you know its the fuel pump. Maybe the thing is wearing out and working sometimes yes and sometimes no. just my idea because you keep coming up with the fuel pump noise thing.
04-10-2006 09:09 PM
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mboucher1978 Offline
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Post: #8
 
we are going to try that with the starting fluid tomorrow. one thing that we noticed is that whe the temperature outside is cool, the car will start fine, but once the temerature goes up and it gets warm outside, the car will not start at all. we have to wait for it to cool down outside before it will run again.
04-11-2006 08:26 PM
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mboucher1978 Offline
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Post: #9
 
we tried the starting fluid and once we sprayed that in there it started right up but there was no pop. it stayed running once it was going. we shut it off again and tried to start it up and it wouldn't start again. so we put the original coolant temperature sensor back in the car just to see what would happen and it started up. so we don't know if maybe we got a bad sensor when we replaced the original.
04-13-2006 08:11 AM
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Flexo Offline
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Post: #10
 
Dontcha just love the word ' electronic'??
04-13-2006 08:38 AM
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mboucher1978 Offline
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Post: #11
 
no i really don't like that word anymore. i tried to start it when i got home from work and it started up without a problem. but it is not really as warm as it has been. i guess the true test will be when it warms up a little bit more and we will have to see what happens. thanks for everyone's help. if things still are the same i will probably be back again.
04-13-2006 01:50 PM
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way2old Offline
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Post: #12
 
re-tired Wrote:verify spark at ends of plug wires . if ok verify fuel press using fuel press gauge that your gonna buy. let us know results.

Have you done this yet? You will need to check fuel pressure during no start. GM pumps are known for shutting down while hot.

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04-13-2006 10:32 PM
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mboucher1978 Offline
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Post: #13
 
no we haven't tried that yet, but we will the next time it happens. thanks a lot.
04-14-2006 08:50 AM
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mboucher1978 Offline
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Post: #14
 
well we tried to start the car today while it was warm outside and it didn't want to start. so we checked the fuel pressure while it was trying to start and there wasn't any. well the car just left and got towed to get checked out. fortunetly we still have a warranty that covers most things. i guess we will have to find out.
04-18-2006 03:53 PM
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mboucher1978 Offline
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Post: #15
 
the dealership that we bought the car at checked the car out today. they said that the problem was the ignition switch. does this sound right or are they pulling one over on us :?:
04-19-2006 08:11 PM
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Post: #16
 
WaytooOld and retired kept leaning on the fuel pump. Unless there is a completely separate wire going to the fuel pump from the ignition switch.
What do the pros, think?
04-19-2006 09:20 PM
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re-tired Offline
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Post: #17
 
The first thing to check when testing for bad pump is to verify pwr to it. If no pwr at pump u correct that first. Then verify pump operation i.e. ,no excessive amps that could cause elect probs. I thought that myself & way2 old were considered pros ? :oops: :lol: :lol:

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04-19-2006 10:23 PM
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Post: #18
 
I [u]did [/u]mean you two guys.

But he went to some dealer at got some story about an ignition switch and then he didn't even mention whether or not the dealer guy even tested around the fuel pump. But he paid his money. And that can be rather irksome if it turns out that's not the cause and all he gets is a car with a brandy new ignition switch and the next time the dealer finds "something else" also wrong with the car.
04-20-2006 03:23 PM
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re-tired Offline
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Post: #19
 
Thanks for the vote of confidence :wink: We are diagnosing by mouse ,its not an x-zak method of trouble shooting . the mechanics with their hands on the car have the advantage.

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04-20-2006 03:59 PM
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mboucher1978 Offline
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Post: #20
 
well we got the car back from the dealership a couple of day ago and it is running great now. they replaced the ignition switch and it turns on all the time now. must be they were not pulling our leg. thanks for all the help.
04-22-2006 08:28 AM
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