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01-29-2018, 06:24 PM
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#1 |
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Registered User
Join Date: Jul 2011
Location: El Campo, Tx
Posts: 1,246
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Runs fine for 15 seconds then dies and won’t start
97 Chevy with the vortec V6. Truck sat for few years and then got running again. Due to sitting for so long etc went ahead and put the MPI system on to replace the spider. Cleaned out old gas and everything. Now when it starts up it will run perfectly fine to 3000 rpms for about 15-30 seconds and then it dies. If u try to restart it immediately it will backfire and cough but will not start. Come back 15 minutes later and fires right up and runs good for another 15 seconds and then dies. Any ideas???
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02-02-2018, 01:44 PM
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#2 |
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Registered User
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,501
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Re: Runs fine for 15 seconds then dies and won’t start
Find out what the fuel pressure is doing. Sounds to me like your fuel sock could be partially or mostly blocked so the pump starves for fuel in a short period of time. After it sits for while under vacuum it eventually fills the fuel line up again.
If you don't have a fuel pressure gauge and don't want to buy one, see if you can borrow one from the tool loaner section of the local auto parts store. |
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02-04-2018, 11:15 AM
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#3 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,620
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Re: Runs fine for 15 seconds then dies and won’t start
Possible ignition module failure.
__________________
For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. |
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02-04-2018, 01:23 PM
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#4 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,259
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Re: Runs fine for 15 seconds then dies and won’t start
im betting its fuel related id check the pressure like the other guy said
__________________
Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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02-08-2018, 09:40 PM
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#5 |
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Registered User
Join Date: Jul 2011
Location: El Campo, Tx
Posts: 1,246
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Re: Runs fine for 15 seconds then dies and won’t start
Checked fuel pressure and as soon as truck is cranked it jumps up to right around 55 and hold solid even as truck dies. Then continues holding for minutes after dead. Thinking it probably is the ignition module, havent had a chance to test it yet but that is my next step.
__________________
72 Chevy blue LWB, 99% original Oklahoma truck, 28,000 miles 72 Chevy SWB: http://67-72chevytrucks.com/vboard/s...d.php?t=486626 (Attempt/Mistake #2) 2003 Harley Davidson Dyna Superglide with 2007 Street Bob front end 2000 Ford F350 Powerstroke 4WD CCLB, 310,000 miles running great (STOLEN St. Patricks Day 2014 AND NEVER RECOVERED) 2002 Ford F250 Powerstroke 4WD CCLB (To replace stolen one) Hook em Horns!!! |
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02-11-2018, 01:05 AM
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#6 |
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Registered User
 
Join Date: Jun 2011
Location: Bradenton, Fla.
Posts: 1,100
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Re: Runs fine for 15 seconds then dies and won’t start
some years ago I had a similar symptom. Not only was my ICM bad, but along with it was a bad coil. ...and both were not that old!!
__________________
'70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018) |
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02-12-2018, 06:51 PM
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#7 |
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Registered User
Join Date: Jun 2012
Location: west mi.
Posts: 84
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Re: Runs fine for 15 seconds then dies and won’t start
When you start the truck does it not turn the fuel pump on with
a cranking relay then switch to a oil pressure switch to run the pump? Or is that tbi only? |
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02-23-2018, 01:39 AM
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#8 |
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Registered User
Join Date: Jul 2011
Location: El Campo, Tx
Posts: 1,246
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Re: Runs fine for 15 seconds then dies and won’t start
So I didn’t actually do the work on this truck but when I laid eyes on it within 3 minutes had problem fixed. The mechanic that redid spider neglected to put air intake tube back on and of course the mass airflow sensor was killing it. Put it back on and runs perfectly! Now my problems is with the brakes not wanting to be bled but that’s another thread
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