Question about 1990 Chevrolet C1500

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1990 chevy c1500 hesitation and stumbling during acceleration

Unresponsive to gas peddle at times and has major dead spots. not sure if its the injectors or the timing or if i need a tps sensor

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  • carlo tucarella Dec 04, 2012

    all new spark plugs and wires tho spark plugs show that truck is running lean and hot. checked timing and its off tho when i ****** it to where it should be the truck sputters and dies. fuel pump and fuel filter are both new. electronic connection for fuel injectors looks like it has been replaced previously but looks to be gummed up

  • carlo tucarella Dec 10, 2012

    changed both injectors, seals and gaskets changed the TPS, IAC, MAP, and ECM engine runs now but doesnt stay running, idles rough. next on my list to check is first the ESC or if the timing chain slipped a tooth. really not looking fwd to having to tare the engine apart to get to the chain hoping the new ESC will do the trick any other ideas as to what i can check would be greatly appreciated

  • carlo tucarella Dec 10, 2012

    problems so far: injectors shot turck was pissing gas the second the lines pressurized. 2. TPS code 22 low voltage 3. MAP code 34 low voltage. 4. IAC valve stuck. 5. timing is off. problems fixed so far. 1. started with the injectors. at the time that was the only problem the truck still ran tho there were dead spots and no power behind the pedal so i replaced them and the TPS. after that the truck ran great..for about 24 hours after the initial run the truck degraded at a rapid pace soon there was little to no power behind the pedal and idled badly then the morning after it wouldnt stay running. and all the other problems i listed before started to present themselves. i figure the reason for fast paced degradation could be one of two things or both 1. because of the bad injectors the low amount of fuel delivery was just enough to match closely the ratio needed for combustion (14.7 parts air 1 part fuel) since air flow was a problem as well then when injectors were corrected the ratio was no longer correct or near enough to produce proper combustion. now i fixed the air problem as well as fuel yet still the truck does not stay running which leads me to suspect another possibility which is were my thought to change the ESC comes in. with the fuel and air delivery systems repaired the only hindrance in that area would have to be lack of or improper spark no? that is just about everything i know so far and where i am currently at i hope iv given enough info to help someone narrow down possibilities for me or confirm thoughts of my own

  • carlo tucarella Dec 10, 2012

    next to replace is the ERG valve



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  • 21,873 Answers

Based on what you said, I would say the engine is starving for fuel.
The computer has to be disabled to set timing - there should be a procedure for that.
I would start with checking fuel pressure at the throttle body. If the TPS is faulty you should have a fault code in the computer.
If the fuel pressure is ok and there are no codes, I would suspect the injectors.

Posted on Dec 04, 2012

  •  Stephen
    Stephen Dec 10, 2012

    I would probably need to be there in person to go forward. You should be able to disconnect the vac to the egr and cut it out of the equation. It is either open or closed, or leaking vac. Try not to tackle too many things at once. Go down the list one at a time. If the timing chain were off the dist would be off too, too much to just move the dist in most cases.



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SOURCE: 1995 chevy silverado 350 TBI V8 standard powerloss

have you checked the filter, i know you state the fuel lines are clear though. likely fuel injectors have lost flow. the TBI injectors can be cleaned, but i usually just replace them. but check them using a timing light hooked to the coil wire for timing of each injector spray. the pattern under the light should be even and conical shape, no major spatter. if one shows low volume, the other one should be replaced at same time, it will save you having to change it when you put brand new next to old one a have same problem again. only replace with brand new, i've had 7 bad remanufactured injectors on one truck at one point in time, only replace with new!

Posted on Jul 08, 2010

  • 231 Answers

SOURCE: 1990 chevrolet c1500 silverado

Things to check
ignition system: coil, plugs,rotor,cap, lead wires
dirty injectors
fuel pressure
air filterfuel filter
EGR system
air leaks at throttle body and manifold

Posted on Oct 09, 2008

  • 12 Answers

SOURCE: No fuel to the injectors on a 1997 Chevy c1500.

can be the distributor or maybe the fuel pump let the truck sit and then turn key almost on but not enough to initiate start up and see if you hear pump in the gas tank and if thats not it, it could very well be your distributor it might  be moist in the cap or button area

Posted on Dec 11, 2008

  • 175 Answers

SOURCE: 2001 chevy monte carlo hesitates or stumble on acceleration

try to clean the MAF which locat on the throtel and check the spark plugs from miss fire

Posted on Mar 14, 2009

  • 4 Answers

SOURCE: hesitates on acceleration

Does the car always hesitate during acceleration? If it ALWAYS struggles when it starts or ALWAYS hesitates on acceleration then I would say the issue is fuel delivery. If the problems are more intermittent and come-and-go then it could be an electrical issue.

I would start by changing the fuel filter. Changing plugs, wires, cap, and rotor are all good things to do as your budget will allow. I doubt you will have to change your injectors.

If you end up replacing any rubber fuel line, be sure to use the high-pressure stuff made for use on fuel injected cars.

I hope this helps! -Nick

Posted on Apr 10, 2009

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