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Asked by Dukeofearle Nov 09, 2014 at 12:57 PM about the 1991 Mitsubishi 3000GT SL FWD

Question type: Maintenance & Repair

I have a 91' 3000 GT SL with 51,800 miles.  Have had problems for a long time with engine intermittently missing.....drives ok for a while then takes a nose dive and looses power and wants to stall....kinda feels like the engine is running on less than 6 cylinders (as if someone pulled a couple plug wires while running).....if I play with throttle, the engine will sometimes come back....other times not.  The tach wildly jumps between 0 and 7000 RPM while it misfires.  I replaced the PTU and all three coils with NOS parts as I was getting error codes of 52 and 53....trhat made sense to me because the PTU feeds the tach.  Ran ok for a while than did the same thing again.  Took the coils and PTU out again and bench tested to be sure they were OK....then put back in the car.  Each time I did this, I took the neg battery cable off to be sure I didn't short anything.  The second replacement I did I noticed a "click" when I put the neg cable back on....sounded like a relay switching or a fuse link or fuse blowing.  This time the engine turned over but wouldn't start.  I checked all the fuses under the hood and dash and all fuses look good.  I'm not a total gear head but I can follow directions and can figure things out.  Can anyone give me some help with this???

5 Answers
199,735

dandyoun answered 9 years ago

Have you checked your ignition relay? Mounted under carpet passenger side of center console. Have you checked for fuel pressure?

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199,735

dandyoun answered 9 years ago

Also check your negative battery connections on the frame and motor. These cars are known to do all sorts of weird things when grounds are not perfect.

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Dukeofearle answered 9 years ago

I did check grounds on transmission and the two on the firewall (first one to the ground side of battery and second one from firewall to motor) they were OK. When I heard the click is sounded like it came from the top or rear of the engine and the more I think about it I think it sounded like a relay or spark jump. I will pull the ignition relay.....is there a bench test to check for defects???

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30,130

mikeatpriestlake answered 9 years ago

yes, go to you tube and type in "how to test automotive relays". also, ericthecarguy.com has a vid or 2 on this subject.

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