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

It sounds like the ignition timing is way off.

1 people found this helpful.
625

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

Your Answer:

3000GT

Looking for a Used 3000GT in your area?

CarGurus has thousands of nationwide listings and the tools to find you a great deal.

Postal Code:

CarGurus Experts

  • #1
    dandyoun
    Reputation
    3,930
  • #2
    Daniel Foster
    Reputation
    1,740
  • #3
    David Girard
    Reputation
    440
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Mitsubishi Eclipse
13 listings starting at $4,998
Used Mitsubishi Lancer Evolution
3 Great Deals out of 13 listings starting at $21,995
Used Chevrolet Corvette
28 Great Deals out of 1,058 listings starting at $15,871
Used Dodge Stealth
2 listings
Used Ford Mustang
65 Great Deals out of 1,258 listings starting at $4,995
Used Toyota Supra
62 listings starting at $51,977
Used Nissan 300ZX
5 listings
Used Chevrolet Camaro
16 Great Deals out of 307 listings starting at $9,995
Used Acura Integra
5 Great Deals out of 172 listings starting at $30,990

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.