Mechanics

CHEVROLET SILVERADO EXHAUST PROBLEM

1994 Chevrolet Silverado • 142,000 miles

350TBI engine.

The truck's idle is a little rough but not bad. Driving the truck at 45mph or slower is not a problem as long as we are easy on the pedal. If we try to give it gas as to pull into traffic or drive any faster that 45ish, it sputters and bucks and seems to be missing severely. It has no power really. We have already changed the ECT sensor and tried a few different MAP sensors with no luck. We test the TPS with a multimeter and it appears to be functioning properly and now we are at a loss. Gas mileage is bad, no power and its occasionally smoking black.
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Tristanboyd
January 13, 2013.



I bet you have a bad cat converter.

Have the back pressure checked.

Roy

ASEMaster6371
Jan 13, 2013.
Forgot to mention, there is no cat on this truck.

Tiny
Tristanboyd
Jan 13, 2013.
Ok, still look for exhaust restriction in the system

Roy

ASEMaster6371
Jan 14, 2013.
We couldn't find any restricitions in the exhaust. Free flowing and loud like always. Gotta love a catless system with flowmasters. Anywho, what would you suggest us trying next?

Tiny
Tristanboyd
Jan 17, 2013.
Lets start with basics. Compression, fuel pressure and spark.

Verify all 3 are good and we go from there

Roy

ASEMaster6371
Jan 17, 2013.