wont run on petrol but will on gas??

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pkr03

New Member

Posts

11

• Oct 22, 2010

• #1

well the title says it all... have a 1993 4.2 lse that wont run on petrol but will on gas!! the injectors are not pulsing..fitted new ecu and changed main relay...still nothing! any ideas???

 

lowfat

Active Member

Posts

427

Location

Cornishwall

• Oct 22, 2010

• #2

Is the pump running?

 

P

pkr03

New Member

Posts

11

• Oct 22, 2010

• #3

yes the pump's running and fuel is getting to the rail.

 

Derek Ward

Active Member

Posts

798

Location

Happily Ex Blackburn, Now Blairmore, Argyll & Bute

• Oct 22, 2010

• #4

Does it start on petrol? If it does, once it's started, disconnect the MAF or if it starts on gas, disconnect it and then switch to petrol. Reason I say this is my 3.9 will start and run for 4 or 5 minutes and then stop and will not restart until stone cold again. If I disconnect the MAF once it's started from cold, it'll continue to run. It won't however start again with the MAF disconnected.

 

classic kev

Well-Known Member

Posts

3,506

Location

on the side of a hill near Nannerch, N.Wales

• Oct 22, 2010

• #5

pkr03 said:

well the title says it all... have a 1993 4.2 lse that wont run on petrol but will on gas!! the injectors are not pulsing..fitted new ecu and changed main relay...still nothing! any ideas???

Click to expand...

Injectors are on a switched earth. Check, clean and re-check all earth points, especially on the injection loom. Maybe try a continuity test on the injector part of the loom.

Thre was a similar problem posted not that long ago, if I remember well that was a fault in the injector loom. Do a search for details.