1997 chevy truck won't start after hot.

[mikepmcs]

My buddy has  1997 Chevy PU.  You start it, drive it, shut it off and it won't start again for like 45 min.  Then it fires right up and do it all over again.

He says it's been doing it for a while now.  I imagine it's a fuel issue or a relay sticking somewhere, but I'm just wondering if anyone has had any experience with this problem(as in.. commonality of the problem and the cure).

Thanks

v/r
Mike

[Charger1973]

My friends S10 was doing that for the longest time.  I think it stopped after they replaced the EGR valve. 

[andy74]

typically on chevies when they act like that its the starter solenoid-its mounted right on the starter,and they get hot from the exhaust-its called heat soak

[Charger1973]

typically on chevies when they act like that its the starter solenoid-its mounted right on the starter,and they get hot from the exhaust-its called heat soak

Heard of that happening before too.

[DodgeChargerNeeded]

Fuel Pump is gonna go out soon. Same thing happened to my 97 Chevy and I also had a 95 s-10 do that. Fuel pump both times.

[mikepmcs]

typically on chevies when they act like that its the starter solenoid-its mounted right on the starter,and they get hot from the exhaust-its called heat soak

it does crank though, it just doesn't fire. 

thanks for the replies thus far.  The only reason i haven't jumped on the fuel pump yet is because of the fact that it will run all day long and never cough spit, hesitate etc...  but once you turn her off and try to start it again you're screwed for a certain amount of time.  thats why my mind goes to a relay or something to that effect.

keep em coming, all suggestions/advice is appreciated and taken into consideration.

as I always i appreciate everyone's time.
v/r
Mike

[DodgeChargerNeeded]

Yup same thing as long as you left it running it was fine. You shut it off and the fuel pump wouldn't turn back on for a while. I didn't go for the fuel pump at first either so I checked a bunch of other stuff and then changed the fuel pump and never had another problem as long as I owned it.

[Charger_Fan]

It could very possibly be the ignition module wearing out, they can become heat sensitive after a while.
Have you checked for spark when it dies?

[mikepmcs]

Not yet on the spark thing, just because it's his truck and he just recently decided to ask for my help cause i'm guessing he's had enough. 

I'll go ahead and check spark just cause it's an easy/free thing to do.   I'm really starting to lean towards the fuel pump idea.  That was my initial thought to begin with.

No hurry though cause he has a company truck, so i'll keep taking suggestions so i have a bunch of ideas the day he decides to want to work on it again.

thanks
v/r
Mike

[67_Dodge_Charger]

I had a problem with my 94 Chevy a year ago.  It may be the pickup coil in the distributor.  My truck would run fine but would quit if I let of the gas pedal.....  I thought the fuel system was faulty.  I changed everything but the fuel pump.  I did not have the space to pull the fuel tank so I took it to my mechanic.  He diagnosed the problem and had my truck running in no time.  The pickup coil will run intermittently and fail to operate when the computer does not advance the timing curve. 

good luck

Robert

[firefighter3931]

I had a problem with my 94 Chevy a year ago.  It may be the pickup coil in the distributor.  My truck would run fine but would quit if I let of the gas pedal.....  I thought the fuel system was faulty.  I changed everything but the fuel pump.  I did not have the space to pull the fuel tank so I took it to my mechanic.  He diagnosed the problem and had my truck running in no time.  The pickup coil will run intermittently and fail to operate when the computer does not advance the timing curve. 

good luck

Robert

The other thing to look at is the coil. Often when they get old and tired the engine heat will create hot re-start problems. Next time this happens check fo spark : both going in and coming out of the distributor cap. 


Another thing to look at is the oil pressure switch. GM trucks have the fuel pump tied into the oil pressure switch and if the switch reads low pressure it will cut off power to the electric fuel pump. I found this out the hard way after screwing around for several hours on my old pickup. Pump worked fine when i hotwired it to the battery but wouldn't work through the ignition circuit. The oil pressure switch wasn't reading enough pressure as the engine rolled over (cranking) and no juice to the pump.  Popped a new switch on there and it fired right up.

I'm not saying this is the issue in this particular case....just something to be aware of. 



Ron

[no318]

96 & up GM have a VORTEC engine with Sequential Injectors that deliver fuel through an injector to a spring loaded poppet nozzle.  If the pressure is not high enough, even though the injectors are triggering, there is not enough pressure to open the poppet and no fuel gets into the engine.  It is possible  (and I've seen it alot of times) to have an engine run normal at 57-58psi and not start at all on 55 psi.  It ususally shows up as a long crank or no start.  Once they start, they run fine.  Get someone to check fuel pressure AND volume on the pump.  58-64psi ( I think, going off of memory) and ATLEAST a pint in 15 seconds of volume.  That is where I would start at.

[Back N Black]

Its going to be very hard to diagnosis until you hook it up to a scanner,to pull out the the codes,check the data stream,use the snap shop mode to see when this is happening etc.
My guess,because it happen to me would be check the MAP sensor ? I could start it up cold,but when it reached operating temp.no start,let it cool down a little it would start up.

[mikepmcs]

wow all great ideas.  I will definitely be trying most of them due to the fact that a fuel pump for his chevy will cost him over $4 bills.   

I have an OBD II but couldn't pull any codes.  It was clean.   Now this isn't a high tech one, it's the actron CP9125 pocket scan.  But it has paid for itself already with my H2 i used to have and I just fixed a mountaineer with it 10 minutes ago.  I imagine he will have to go to the dealer to get the big diagnostic machine on it if some of these great ideas don't get me anywhere.

thanks again.

v/r
Mike

[jgbailey57]

fuel pump.  listen to what no318 said.  truck had about 55 psi but wasn't enough to fire the injectors.  found out later (after many replaced parts) pressure was supposed to be 60~65 if i remember right.

[Brock Samson]

here's "fullsizechevy" a site i just joined, they may be able to help...

http://www.fullsizechevy.com/

[Charger1973]

My vote goes to the starter

[mikepmcs]

Charger1973.

Just a question, if it was the starter wouldn't it not turn over though???  It cranks all day just no fire, fuel etc....

[Charger1973]

I couldnt tell you exactly what the deal was but what andy74 was saying sounds exactly like a problem a friend had.  It seems like he pulled it apart and replaced something in the solenoid but I wasnt there.  He said at first he didnt think it came apart but he found a way and im not sure what he did/replaced but whatever it was worked. 


By the way this is the friend I mentioned before the EGR valve wasnt the problem, that needed replaced too but it was only making it run rough, the starter is what was causing it to not start after it was hot.  And this was a 1989 Chevy S10 4.3L