My truck ran yesterday, but not today

imakeorphans · 2011-10-13T23:15:37+00:00

My truck ran fine yesterday. It has a fresh tune up, good spark, fuel pressure at 36psi with vacuum hose attatched, and proper timing. I had my truck in storage for 2 years with gas stabilizer and decided to empty the tank and add fresh gas. Now it won't start. The truck will fire intermittently while trying to start and produces black smoke. The engine is flooding at startup and the spark plugs were a wet black color. I cleaned the spark plugs with acetone and it still runs the same. I noticed that the throttle position sensor was disconnected so I reconnected it and pulled the ecm fuses to clear the code. There was no change. Unfortunately, I cannot get the truck running long enough to set any trouble codes if there is one. Please give me and idea what to check next.

1992 GMC TYPHOON

83,000 MILES

SATURNTECH9

✓Experienced Mechanic
30,869 POSTS

Your welcome that would have caused a running issue lets play it by ear from here in out on how it runs.

Nov 21, 2011 at 5:15 PM

IMAKEORPHANS

MEMBER
24 POSTS

Hi saturntech9, I forgot to update you about what was wrong with my truck. It turns out that the ground wire to my ecm was corroded and provided groungd intermittently. I replaced the wire and the problem dissappeared. Thanks again and I hope this helps anybody with a similar problem.

Jun 8, 2012 at 4:16 AM

SATURNTECH9

✓Experienced Mechanic
30,869 POSTS

Thanks for the update glad you got it figures out.I knew it had to be something intermintant.

Jun 8, 2012 at 7:51 AM

WRENCHTECH

✓Experienced Mechanic
20,761 POSTS

The correct fuel pressure for that truck is 38 to 42 PSI with the engine off.

Jun 8, 2012 at 8:29 AM

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