Question about 1994 GMC Sonoma

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Hi i have 94 sonoma 2 wh drive 4 cyln.just did tune up plugs wire pcv valve.engine has a studder or skip under acceleration and some losse of power when this happens.but doesnt happen all the time.spark plugs color was white upon removel.notor running lean can ui help

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  • Ben Oct 03, 2010

    this truck has 2 ignition coils insted of a distributor.i didnt gap the plugs im not sure if that could cause my problem.but i know it was running fine when i got the truck and foe a couple months after .then the skipping started.thanks for your help.

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Im a chevy guy but i also know a bit about gmc and the one thing i can tell you is that both have problems with the distributer having to much play in it to check it you just pull off the cap and leave the rotor on and see if you cna move the shaft to either side replace it if it has play also check to make sure you have the gap in the plugs set right if its a sencer problem your check engine light will come on.

Posted on Oct 02, 2010

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1 Answer

Need transmission, center console, and floor mats for 2001 Sonoma SLS...


is this an extended cab ,4wd,automatic or manual transmission ,,studdering can be anything from needing a tune up --tires balanced -motor mount-suspension- c/v axle --u-joints torque converter-rear -transmission clutch-4wd components etc

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Where is the throttle body located?


old post , and great question

the TB is a thing that contains the AIR throttle, the body holds

that TV throttle valve (or some call it a TP throttle plate)

this car has 6 engines, and varies by country. what country>?

what engine? (USA cars have a hood EPA tag, it states the engine)



sure cleaning it can help and for sure with throttle by wire.

the body gets full of EGR/PCV crap. (called GUNK) and if not

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why not scan the PCM and SEE ALL DTC errors.

that be first. !!!



loose power has many causes, up to 50.

why not scan it first, (the CEL lamp to me is useless , unless stuck on)

scan it first.

this engine has many limphome modes (suzuki failsafe)

and will run slow. in limp mode.

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the TBW , throttle by wire has it\'s own limp mode.

the transmission too, and others.



The TBW has up to 4 TPS sensors. 2 on the foot and 2 in the TB

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I suggest a full tune up.

1. Air filter.
2. Fuel filter, carbureted engine filter is located inside the line fitting where it attaches to the carburetor. Fuel injected engine filter is located in-line under the truck near the tank.
3. Oil and filter.
4. Spark plugs and wires.
5. Distributor cap and rotor if applicable.
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1 Answer

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1 Answer

I have 4 cyln 5 speed gmc .truck just started skipping or motor hesitation under acceleration,i changed plug, wires,pcv valve.old plugs r white on the heads.i know its lean.please help .has anyone had same...


I hear you!

Bad input = Bad output

Start testing the computer inputs -

1) Air Charge Sensor (Resistance measurement - OHM meter needed)

2) Coolant Temp Sensor (Resistance measurement - OHM meter needed)

3) Crankshaft Sensor (Test procedures off the ignition amplifier)

4) Detonation Knock Sensor (This can cause your symptoms if there are any rattles in the motor or exhaust pipe - like a loose heat shield or bracket causing the rattle will be picked up by the knock sensor - which in turn retards the timing causing a stumble and hesitation)

5) MAP (Manifold Absolute Pressure) Sensor (make sure the plug contacts to it AND all of your other inputs are not corroded - also check the vacuum line going to the MAP and make sure there are no leaks, cracks....)

6) O2 Sensor (Would normally show up on computer as needing replacement - not always though )

7) Throttle Position Sensor (this is a variable resistor, which can and does get wear spots on it - sending incorrect voltages to computer causing your stated symptoms too. A good analog meter would be nice to test this. engine off, key on - You can tap into the voltage side and watch the needle carefully while slowly opening throttle to wide - and back to close. If the needle on the meter moves smoothly from one side to the other without and dips or jerking motions, then the TPS is fine - of course the voltages need to be within parameters)

You can find all of the testing procedures and vehicle specific data at alldatadiy.com

Good Luck.

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1 Answer

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Hello,
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