1990 k1500 problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

88 gmc · 05-09-2006, 02:31 PM

OK i bought this truck about 2 weeks ago i did a tune up fuel filter ignition coil ,ignition module,tps,egr,exhaust,oil change,map,new tb base gsk and it still has a hesitation like it's missfiring but if i let off the gas and accelerate agian it's fine .the truck is a 305 could it be the the fuel pressure regulator or fuel injectors the timing is also correct as i checked that.Any help would be great

88 gmc · 05-09-2006, 02:56 PM

also the truck idles fine until put into drive

88 gmc · 05-09-2006, 06:42 PM

nobody has any input for me

cantburn · 05-09-2006, 08:34 PM

Mine had hesitation problems and I changed all the sensors etc. Could not for the life of me figure out what was causing this problem. What I did do that finally changed the way the truck drove, I replaced the injectors, the fuel pump along with the sending unit and what made a big difference was the coolant sensors located on the intake by the water neck and the one on the driver's side of the block above the exhaust manifold. I also installed a JET performance chip in the ECM. As I said before I replaced alot of things including the entire ignition circuit from the spark plugs to the entire distributer. I replaced every sensor on and around the engine, put a TBI spacer in and an AIR RAID intake. I put in a set of shorty headers with O2 sensor and run 87 octane. I have heard though that if you run 92 octane, alot of these hesitation problems disappear. Good luck, Chip

88 gmc · 05-10-2006, 08:47 AM

thanks chip i will be trying new fuel inj. and a temp sensor i don't believe i'll be changing the oil pressure sensor as that seems to work great

05-09-2006, 02:31 PM	#1
88 gmc Registered User Join Date: Apr 2006 Location: ma. Posts: 9	1990 k1500 problems OK i bought this truck about 2 weeks ago i did a tune up fuel filter ignition coil ,ignition module,tps,egr,exhaust,oil change,map,new tb base gsk and it still has a hesitation like it's missfiring but if i let off the gas and accelerate agian it's fine .the truck is a 305 could it be the the fuel pressure regulator or fuel injectors the timing is also correct as i checked that.Any help would be great

05-09-2006, 02:56 PM	#2
88 gmc Registered User Join Date: Apr 2006 Location: ma. Posts: 9	Re: 1990 k1500 problems also the truck idles fine until put into drive

05-09-2006, 06:42 PM	#3
88 gmc Registered User Join Date: Apr 2006 Location: ma. Posts: 9	Re: 1990 k1500 problems nobody has any input for me

05-09-2006, 08:34 PM	#4
cantburn ParrotHead Parts Join Date: Mar 2005 Location: Port St Lucie, Florida Posts: 218	Re: 1990 k1500 problems Mine had hesitation problems and I changed all the sensors etc. Could not for the life of me figure out what was causing this problem. What I did do that finally changed the way the truck drove, I replaced the injectors, the fuel pump along with the sending unit and what made a big difference was the coolant sensors located on the intake by the water neck and the one on the driver's side of the block above the exhaust manifold. I also installed a JET performance chip in the ECM. As I said before I replaced alot of things including the entire ignition circuit from the spark plugs to the entire distributer. I replaced every sensor on and around the engine, put a TBI spacer in and an AIR RAID intake. I put in a set of shorty headers with O2 sensor and run 87 octane. I have heard though that if you run 92 octane, alot of these hesitation problems disappear. Good luck, Chip __________________ "I Love the Smell of a Salvage Yard in the Morning" 1992 GMC K1500; The best projects are those still in progress. (Paypal verified 100% positive feedback);

05-10-2006, 08:47 AM	#5
88 gmc Registered User Join Date: Apr 2006 Location: ma. Posts: 9	Re: 1990 k1500 problems thanks chip i will be trying new fuel inj. and a temp sensor i don't believe i'll be changing the oil pressure sensor as that seems to work great



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