Question about 1987 GMC Suburban
I can see the injectors spitting gas into the throttle body, but it won't start. It occasionally backfires through the throttle body
I had a similar problem, what happened for me is this. i live in the mountains where it snows a lot. the thermostat is designed to not let the engine start if it is to cold inside the engine. sometimes when that thermostat gets that cold it will stick. so that when it warms up the thermo still thinks its frozen. unplug the thermostat, located on the top of the engine near the throttle body. that worked for me. after it fired up i plugged it back in and i was ready to rock and roll
Posted on Nov 29, 2008
That does not sound good. It seems that you may have broken or worn rings or pistons. You could try timing the engine and see if that is not a problem but I think it is a bad piston and rings.
Posted on Nov 14, 2008
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Posted on Jan 02, 2017
SOURCE: doesn't start
All an engine needs to run is air, fuel, spark, and timing. You appear to be getting fuel. Pull a plug and reconnect it to the plug wire. Ground it to the engine away from gas and fumes and see if you get a good hot blue spark. If so cover the intake with your hand and turn the engine over. If you feel vacuum then you are probably getting air. If all of these things are okay then you are most likey looking for a timing issue. This could be mechanical like the timing belt or chain, valve train and cam(s), etc... It could also be the engine management systems including camshaft positoin sensor, mass airflow sensor, etc... I am assuming the van has the 4.3 Liter V-6 common for that model.
If it backfires it is probably getting spark maybe not at the right time. If these simple checks pan out you probably need to refer this problem to a mechanic.
Posted on Nov 14, 2008
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