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Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 6957
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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It runs really rough when it warms up but will run fine with

Customer Question

it runs really rough when it warms up but will run fine with full boost
JA: What is the model/year of your Mitsubishi?
Customer: eclipse 1995
JA: Are you fixing your Eclipse yourself? What have you tried so far?
Customer: yes i am and ive tried replacing the fuel pump which made it run better but then after it warms up it starts stuttering and running terribly
JA: Have you ever replaced the fuel pump, or is this the original?
Customer: yes i replaced it
JA: Anything else you want the mechanic to know before I connect you?
Customer: when it runs rough the rpms shoot down to 0 on the tachometer and runs over a 17.9 AF ratio
Submitted: 11 months ago.
Category: Mitsubishi
Customer: replied 11 months ago.
the car is a 95 eclipse gsx with a first generation gsx "6 bolt" engine in it. when it starts running harsh it sounds as if its timing is off or as if its missing but it isnt missing. and at idle when it runs rough it shoots down the RPMs down to 0. the AF ratio is at 18 when runing rough but the exhaust smells rich
Expert:  K. Wiggins replied 11 months ago.

Have you been able to pull any codes?

Customer: replied 11 months ago.
The check engine light doesn't come on so I haven't tried yet
Customer: replied 10 months ago.
Thanks for nothing