Starting Problems

25

Asked by Nov 09, 2014 at 12:57 PM about the 1991 Mitsubishi 3000GT 2 Dr SL Hatchback

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

11,900

thats a toughie, i would look for vacuum leaks to start with.

114,275

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

1 of 1 people found this helpful.
114,275

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 of 1 people found this helpful.
25

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 of 2 people found this helpful.
11,900

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 of 1 people found this helpful.

Your Answer

3000GT

Looking for a Used 3000GT in your area?

CarGurus has 94 nationwide 3000GT listings starting at $2,999.

ZIP:

Mitsubishi 3000GT Experts

  • #1
    dandyoun
    Reputation
    2,550
  • #2
    Daniel Foster
    Reputation
    970
  • #3
    T_S_T
    Reputation
    260
View All

Related Models For Sale

Used Mitsubishi Eclipse
18 Great Deals out of 1,193 listings starting at $1,795
Used Ford Mustang
724 Great Deals out of 38,098 listings starting at $895
Used Nissan 300ZX
141 listings starting at $3,995
Used Mitsubishi Lancer Evolution
19 Great Deals out of 575 listings starting at $14,000
Used Toyota Supra
68 listings
Used Chevrolet Camaro
416 Great Deals out of 30,919 listings starting at $3,550
Used Dodge Stealth
41 listings starting at $4,900
Used Chevrolet Corvette
298 Great Deals out of 20,672 listings starting at $2,990
Used Mazda RX-7
71 listings
Used BMW M3
46 Great Deals out of 1,811 listings starting at $5,995
Used Nissan 240SX
11 listings

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.