Would turn over ~ but no spark or fuel no start?

Tiny
MITSU2CARPORS
  • MEMBER
  • 1998 MITSUBISHI DIAMANTE
  • 3.5L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 185,000 MILES
Willing to donate ~ but seriously gun shy from other online advice experiences !

Car sat idle for about 4 weeks NOV/DEC 14 parked front downhill at slight angle. Would turn over ~ but no spark or fuel no start.

Got car on level pulled distributor cover cleaned any moisture and light corrosion off rotor & cap/plug contacts. Started ! Let it idle for 15-20 minutes ~ added Heet/10 gal of no ethanol gas with marine stabil over course of working at getting it started.

4 hours later, hopped in started & drove about.5 mile when it started cough/miss/hesitate, as if water in fuel ~ then evened out. In 100 yds started up small hill ~ cough/miss/hesitate/rough time with power loss. Sputtered to top of hill. On flat shifted to N engine evened out reved without hesitation shift to D and on our way until half way up next hill repeated cough, etc. With increasing power loss, then died. Noted whitish exhaust and uncharacteristic smell from exhaust or engine after raised the hood.

Turns over no spark no fuel. All fuses checked & ok. No other obvious wiring burns/damage evident. Jumper test of fuel pump activates fuel pump. Replaced paired fuel pump & MFI ( multiport fuel injector ) relay and can feel/hear them click ~ no power to fuel pump.

Hope you can help !
Thursday, January 22nd, 2015 AT 2:27 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try resetting your security system something may be wrong with your security system.
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Thursday, January 22nd, 2015 AT 3:05 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,356 POSTS
That will not cause the engine to stall without fuel or spark. To me it sounds like the multi-port control relay (MFI) is overheating and shutting down which is common with these cars. Here is the location so you can swap it out which should fix the problem. It should say the MFI relay on the lid of the fuse panel. Check out the images (below). Please let us know what happens.
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Thursday, October 3rd, 2024 AT 3:40 PM

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