Question about 1991 GMC Sonoma

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My 91 gmc sonoma 2.8L wont run I have gas, compression, spark timing seems to be on but cant figure out why it wont run. just need some direction

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Check the coil for spark. If weak or dead it will not start.

Posted on Feb 01, 2010

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91 gmc sonoma running rich


is the ignition tuned--cud be weak coil pruducin bad spark or the alternator havin issues-----------the float level is off if carburated-----the injectors not putting out balance-- get vehicle on a diagnostic scan from a private mechanic--it displays values of systems sensors etc. make sure air cleaner is good--pollen cant be seen! Try disconnectn computer and cleanin the plug then hook up and see if car reboots to norml. Its a shortcut used w older cars cause connections erode w age

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How to tell if the timing is out on a 1997 gmc sonoma 4.3 vortec


That popping - backfiring sound would indicate the spark is not in time with the cylinders. Why is another question.
The distributor cap could be cracked or defective, the timing chain could have failed, or something going on with the ignition module among other things.
A mechanic would run a compression test or otherwise make sure the timing chain is ok before proceeding.

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Is a 1993 gmc 2.8 an interferenc engine


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Getting spark getting gas but will not start


If you have spark, the valves may not be working due to a break in the timing belt, chain, or gear. Some of these engines get a timing pulse from a Crankshaft sensor and it does not mean the Cam is turning.

If your sparkplugs are easy to reach, you can try removing one to see if you have compression when the engine is turned over. If no compression, then the Cam most likely is not turning. If you have a Distributor and have spark, then check to see if the engine has fire to the coil in the RUN position.

Your Ignition key has 2 positions which deliver spark, the Starting position and the RUN position. You can have spark when you crank, but can lose spark when you release the Key to the run position.

You may also have insufficient fuel pressure although you have fuel. What you are seeing may be residual gas from before when the fuel pump circuit failed.

Thats' all I have for now.

Dec 31, 2011 | 1991 GMC Sonoma

1 Answer

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Aug 29, 2009 | 1991 GMC Sonoma

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Ok..after starting with fuses then cap and rotor..it turns out the 5 month old rotor was fried!! so problemo fixed.. thanks for suggestions. and to my mechanic friend who told me to start from scratch!

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any spark at the plugs could be a crank sensor gone

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1 Answer

1991 Sonoma Idles high and somtimes wont idle


Check the fuel filter-they had a recall on replacement filters(fram?-just google GMC Recalls) or go to 91 GMC Sonoma Repair=many sites to tell you and download manuel. Then the library has books if you dont. Good luck and God bless1
Scoyboy

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