Starting Problems
25

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
199,805

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?

2 people found this helpful.
Mark helpful
199,805

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.

1 people found this helpful.
Mark helpful
25

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???

2 people found this helpful.
Mark helpful
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.

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

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:

Shortcuts

Search Mitsubishi 3000GT Questions

CarGurus Experts

  • #1
    dandyoun
    Reputation
    3,920
  • #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
9 listings starting at $6,995
Used Mitsubishi Lancer Evolution
10 listings starting at $19,998
Used Ford Mustang
35 Great Deals out of 1,585 listings starting at $5,977
Used Toyota Supra
3 Great Deals out of 46 listings starting at $50,500
Used Chevrolet Corvette
23 Great Deals out of 767 listings starting at $18,999
Used Mazda RX-7
1 listing
Used Honda S2000
19 listings starting at $24,991
Used Nissan 300ZX
4 listings
Used BMW M3
6 Great Deals out of 74 listings starting at $14,995
Used Acura NSX
12 listings starting at $65,000
Used Mazda MX-5 Miata
166 listings starting at $8,496

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.