94 . RUNS FINE, WHEN 1ST STARTED. BEGINS TO REQUIRE HIGH REVVS TO RUN, ESPECIALLY ON TAKE-OFF.

1994 Geo Tracker

Tiny

Mack

May, 16, 2012 AT 10:51 PM

If turned off for a short time, gas pedal has to be floored. Runs very "doggily" until revvs built up & belches black smoke. If turned off longer time (hr+) starts normally & runs o.K. For a while. Tried replacing ECM. Ran fine for a couple of dsys, then back to problem. ECM has been tested by 2 re-builders who say it tests o.K.
"What's up w/ that?"
Thanx, Mack

FOUND 4250 RELATED QUESTIONS

1 Answer

Tiny

ASEMaster6371

May, 16, 2012 AT 11:25 PM

I would have a back pressure test done on the cat converter. It may be clogged or a piece may be clogging the outlet.

Roy

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