Rough idle, flames from exhaust

Asked by Will Oct 25, 2016 at 10:38 AM about the 1994 Mitsubishi 3000GT SL FWD

Question type: Maintenance & Repair

I recently replaced the motor in my 3000gt after a
mechanic said I bent 8 valves in the orginal motor.
After dropping the motor in, making sure that
everything was hooked up (minus the egr valve and
sensor that is not on this motor) I got her started
but she back fires and runs rough. While working
on it the other night the wife said that she seen a
glow coming from the exhaust when I revved it,
looking for myself I noticed a 6inch flame shooting
out of the exhaust and both cats glowing bright.
What could be causing this? How can I fix it?

3 Answers

F_O_R answered 8 years ago

It sounds like the ignition timing is way off.

1 people found this helpful.
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overload answered 7 years ago

Hot dam! Son u got a fast n furious car. Running way rich timing off by a lot! Something is hooked up wrong! You need a odb scan tool to make sure everything is in order before you blow it up

Mark helpful

Your Answer:

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