"94 Geo Tracker. Runs fine, when 1st started. Begins to require high revvs to run, especially on take-off.

1994 GEO TRACKER
300,000 MILES • 4 CYL • 4WD • MANUAL
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MACK
  • MEMBER
  • 15 POSTS
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
May 16, 2012 at 10:51 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
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
May 16, 2012 at 11:25 PM
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