96 jimmy long start

mywintertruck · #1 10-09-2006, 01:27 PM

hi again. once again i searched and didnt find anything related to my problem. this has been happing almost a year now. when we start the truck cold or even ten minutes after it has been driven for awhile, it seeems to take like anywhere from 5 to 12 seconds to start. however every once in a great while when then engine is warm and its hot outside it will start right up. we replaced the fuel filter this summer thinking it was that.. nope. i dont think its the fuel pump because it runs perfect after its started, plus i would think it would have taken a crap on me in the past year. i could be wrong about the pump, but hopefully not. someone said maybe a fuel pressure regulator?
i have no clue what that is, or where its at. if anyone knows from experience about this or knows whats wrong, pls let me know.

thanks
phil

Robert72380 · #2 10-11-2006, 08:21 AM

Ok I really can't help you there but I can tell you that I have the same problem but it got worse last night. First of all had pully go bad on the alt. so replaced alt. Everything fine until I decide to floor it to test it out and the truck took off when it hit 45 mph the new alt died (I think) Voltage dropped to 12 and battery light came on and the truck wouldn't go past 45 mph no matter how much gas I gave it. At first I thought it was the fuel pump but was told it couldn't be it. After last night thought it was electrical but now think the power loss has nothing to do with truck bogging down could it be the fuel pressure regulator? I have a chilton manual but it really doesn't help with troubleshooting especially since my check engine light isn't on.

Robert72380 · #3 10-11-2006, 08:26 AM

fuel pressure regulator is under the upper intake manifold assembly

Robert72380 · #4 10-11-2006, 08:27 AM

Ok I really can't help you there but I can tell you that I have the same problem but it got worse last night. First of all had pully go bad on the alt. so replaced alt. Everything fine until I decide to floor it to test it out and the truck took off when it hit 45 mph the new alt died (I think) Voltage dropped to 12 and battery light came on and the truck wouldn't go past 45 mph no matter how much gas I gave it. At first I thought it was the fuel pump but was told it couldn't be it. After last night thought it was electrical but now think the power loss has nothing to do with truck bogging down could it be the fuel pressure regulator? I have a chilton manual but it really doesn't help with troubleshooting especially since my check engine light isn't on.

BlazerLT · #5 10-11-2006, 08:45 AM

How about doing a tuneup?

Cap & Rotor
AC Delco Platinum Plugs
Plug Wires
PCV valve
Air Filter

Those are more than likely your problem.

Robert72380 · #6 10-11-2006, 09:22 AM

I see where you are coming from there but if it needed tune up wouldn't it give more of a warning before it basically crapped out? I have had vehicals that needed tune ups and none of them acted like this.

MT-2500 · #7 10-11-2006, 09:38 AM

Quote:

Originally Posted by Robert72380

I see where you are coming from there but if it needed tune up wouldn't it give more of a warning before it basically crapped out? I have had vehicals that needed tune ups and none of them acted like this.

As said tune up is first place to start.
How many miles on tune up and what engine?
Also

Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
Post back fuel pressure readings.
MT

Robert72380 · #8 10-11-2006, 10:36 AM

thats all good man but my starting problem wasn't as bad as his, mine would only be a problem when it was not ran for over 8 hours and recently it had gotten better up until last night the truck ran fine. Any ideas as to what could have failed to make the truck suddenly run like crap? My engine is the 4.3 V6 W code. Like I said it may even an electrical since I floored it and both the alt. crapped out the same time the truck bogged down. And I know the alt didn't cause it to bog down because I have driven it with a bad alt before.

MT-2500 · #9 10-11-2006, 10:44 AM

Quote:

Originally Posted by Robert72380

thats all good man but my starting problem wasn't as bad as his, mine would only be a problem when it was not ran for over 8 hours and recently it had gotten better up until last night the truck ran fine. Any ideas as to what could have failed to make the truck suddenly run like crap? My engine is the 4.3 V6 W code. Like I said it may even an electrical since I floored it and both the alt. crapped out the same time the truck bogged down. And I know the alt didn't cause it to bog down because I have driven it with a bad alt before.

How is your tune up end?
On fuel pressure it needs proper testing along with proper tune up.
MT

BlazerLT · #10 10-11-2006, 11:09 AM

Quote:

Originally Posted by Robert72380

thats all good man but my starting problem wasn't as bad as his, mine would only be a problem when it was not ran for over 8 hours and recently it had gotten better up until last night the truck ran fine. Any ideas as to what could have failed to make the truck suddenly run like crap? My engine is the 4.3 V6 W code. Like I said it may even an electrical since I floored it and both the alt. crapped out the same time the truck bogged down. And I know the alt didn't cause it to bog down because I have driven it with a bad alt before.

Seriously, why are you asking us again when we have already posed what to do?

Do a tuneup, check the fuel pressure.

I don't get why you asked only to ignore the advice we have geven.

alblogg · #11 10-11-2006, 12:00 PM

Quote:

Originally Posted by mywintertruck

hi again. once again i searched and didnt find anything related to my problem. this has been happing almost a year now. when we start the truck cold or even ten minutes after it has been driven for awhile, it seeems to take like anywhere from 5 to 12 seconds to start. however every once in a great while when then engine is warm and its hot outside it will start right up. we replaced the fuel filter this summer thinking it was that.. nope. i dont think its the fuel pump because it runs perfect after its started, plus i would think it would have taken a crap on me in the past year. i could be wrong about the pump, but hopefully not. someone said maybe a fuel pressure regulator?
i have no clue what that is, or where its at. if anyone knows from experience about this or knows whats wrong, pls let me know.

thanks
phil

My friend it could be the pump. Mine did the same thing for about a year. You would have to crank on it two or three times like you said for it to fire but after it started it would hit as soon as you turned the key. Let it sit about two hours the same thing had to crank it two or more times. I thought it was my kill switch on my Viper system going bad and was about to take it out until that morning my Wife went out to leave and it never did start. It was the pump the whole time. Compared to the old way it seems to start before the key is all the way turned now.

mywintertruck · #12 10-11-2006, 01:35 PM

alright thanks everyone, ill give it a tune up this weekend. if that don't work, ill see if my friend can do a fuel pressure test

1996LTOwner · #13 10-12-2006, 01:13 AM

I had intermittant starting problems with my 96 Blazer. Most of the time it would start fine, others I'd have to hold the start switch for several seconds. I replaced the fuel pressure regulator on the back of the spider valve assembly under the intake manifold per the advise of my brother who is a twenty+ year mechanic. Actually, his advise was to replace the whole spider assembly since I was going to have it open, but I wasn't willing to spend the $400.00+ at the time. That fixed the start problem. Hope this helps.

mywintertruck · #14 10-12-2006, 01:22 AM

Quote:

Originally Posted by 1996LTOwner

I had intermittant starting problems with my 96 Blazer. Most of the time it would start fine, others I'd have to hold the start switch for several seconds. I replaced the fuel pressure regulator on the back of the spider valve assembly under the intake manifold per the advise of my brother who is a twenty+ year mechanic. Actually, his advise was to replace the whole spider assembly since I was going to have it open, but I wasn't willing to spend the $400.00+ at the time. That fixed the start problem. Hope this helps.

hey thanks, about what was the price of the regulator?

BlazerLT · #15 10-12-2006, 03:41 AM

Quote:

Originally Posted by mywintertruck

hey thanks, about what was the price of the regulator?

Check you local autozone, it shouldn't be much.

Also, don't ignore the fact you still have to do a tuneup. This has to be done as well, it is mandatory.

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