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06-24-2012, 08:13 PM
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#1 |
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Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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88 GMC problems
Hey y'all, I finally got my truck going (swapped a 89 engine and trans in)
It has been running fine up until the past few days, here are the symptoms It usually starts fine but takes a lil more cranking then I feel it should, sometimes after its warm it will start then imediately die, may take about 3 tries before it stays running, idle doesn't really surge like the iac is bad but it does fluctuate about 100 rpm or less, when accelerating it sometimes has no power and stumbles / hunts, but under wot it runs fine, also ses comes and goes but can't really tell a difference in running with on vs it off and it's random I don't have acces to a fuel pressure gauge, but I would think since wot is ok that it's not a lack of fuel, I cleaned the iac and checked my grounds, but nothing has seemed bad, also had it scanned at Oriellys and it didnt show any codes Can someon point me in a good direction or am I gonna have to check all the sensors with a vom ? Any help would be great, I need to leave for Oklahoma in the next day or so Also it has new: cap, rotor, plugs / wires, air filter, and fuel filter Posted via Mobile Device |
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06-24-2012, 08:29 PM
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#2 |
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Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: 88 GMC problems
It sure sounds like low fuel pressure.
TBI trucks with low fuel pressure have more problems with idle, then at wide open throttle. I know it seem backwards but that's the way they act.
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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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06-24-2012, 10:15 PM
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#3 |
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Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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Re: 88 GMC problems
Seems backwards to me also, but that was my first thought since I've had about 4 go out on me in differnt trucks
Posted via Mobile Device |
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06-24-2012, 10:58 PM
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#4 |
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Texas Big Wig
Join Date: Jan 2007
Location: Mineola, Texas
Posts: 5,620
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Re: 88 GMC problems
This is a vid of the tach during idle
Im with ChevyTech on this tho, I know its the fuel pump just by the way it acts, Ive had too many go out on me for it to be something else |
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06-25-2012, 06:51 AM
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#5 |
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Registered User
Join Date: Jul 2011
Location: Phoenix,Arizona
Posts: 23
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Re: 88 GMC problems
Sounds exactly like my 89 K1500 few weeks ago.Fuel pressure would jump from 10 to 7 psi, was fine at WOT. Replaced fuel pump, intake manifold gasket and TBI gasket. Egr ports plugged solid with carbon.Truck has never ran better...you guys are great posting all this valuable info to help keep my baby running!
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