1987 Suburban TBI not running right. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cheepin · 09-29-2010, 10:16 PM

So my 87 Sub has been hesitating when at partial throttle or when climbing hills.It doesn't do it all the time most of the time when it does it is like it isn't getting gas for a sec.Other times it backfires through the TBI.
I changed the fuel filter and the fuel pump is a GM one that is like 5yrs old.I did the carb cleaner trick and found the base gasket was leaking air in.Replaced it.
It is not throwing any codes.I was thinking Mas sensor or TPS.I don't just want to throw parts at it.Thanks in advance.

GmtGmt · 09-30-2010, 04:43 AM

try replacing the spark plugs and wires they can make a car hesitate some

cheepin · 10-05-2010, 10:52 PM

So no one else has any ideas.It acts like a bad accel pump on a carb.One other thing is it revs up fine when on the gas.It is only when at partial throttle.

09-29-2010, 10:16 PM	#1
cheepin Registered User Join Date: Nov 2009 Location: Parachute, CO Posts: 183	1987 Suburban TBI not running right. So my 87 Sub has been hesitating when at partial throttle or when climbing hills.It doesn't do it all the time most of the time when it does it is like it isn't getting gas for a sec.Other times it backfires through the TBI. I changed the fuel filter and the fuel pump is a GM one that is like 5yrs old.I did the carb cleaner trick and found the base gasket was leaking air in.Replaced it. It is not throwing any codes.I was thinking Mas sensor or TPS.I don't just want to throw parts at it.Thanks in advance. __________________ 1984 1ton 4x4 crew cab dually 6.2 diesel,465,205,D60,D70,1987 3/4ton 4x4 suburban 5.7 FI350,TH400,208,1985 CJ-7 FI406,465,205,D60,FF14, 1970 Jeepster 350,465,205,D44,FF14,

10-05-2010, 10:52 PM	#3
cheepin Registered User Join Date: Nov 2009 Location: Parachute, CO Posts: 183	Re: 1987 Suburban TBI not running right. So no one else has any ideas.It acts like a bad accel pump on a carb.One other thing is it revs up fine when on the gas.It is only when at partial throttle. __________________ 1984 1ton 4x4 crew cab dually 6.2 diesel,465,205,D60,D70,1987 3/4ton 4x4 suburban 5.7 FI350,TH400,208,1985 CJ-7 FI406,465,205,D60,FF14, 1970 Jeepster 350,465,205,D44,FF14,

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