760 GLE V6 missfire

griffin35 · Sep 7th, 2007, 22:30

Hi all need some help on my old 760GLE auto V6!
On start up engine is fine, in under a minute theres a lumpy-ness
like a missfire that begins. car drives fine and no water /oil loss,
or real difference in fuel economy but failed the MOT on emissions!

I've changed so far

lugs, leads, cap, rotor arm, even tried from my spares collection a different Air Mass meter and ECU with no joy..
I've had a compression test done which is also fine????
unplugged most sensors and injectors which dont seem to change it?
Pretty sure its electrical and must be heat related.???

Any idea's?

It's a good old bus and really to good to scrap!

Cheers

Mark

760 GLE Auto V6 - 1990

Jim760 · Sep 8th, 2007, 01:05

a misfire and you thinking of scraping it? lol.

sounds sounds like you have covered msot things, id be looking at the injectors now,, have you tryed a new air filter? and a good bloody blasting!

griffin35 · Sep 8th, 2007, 10:13

Thanks Jim,
Yeah she's too good to scrap!!!

Have unplugged each injector in turn, but the miss seems
to travel around the engine like the compression test which was spot on,
and didnt change on any injector being unplugged???
To me thats what confirms heat and electrical as the issue???

Air filter is good and it starts up fine - but I'll disconnect it and give a try.

Cheers

Mark

Sep 7th, 2007, 22:30	#1
griffin35 New Member Last Online: Sep 8th, 2007 21:01 Join Date: Jul 2007 Location: trowbridge	760 GLE V6 missfire Hi all need some help on my old 760GLE auto V6! On start up engine is fine, in under a minute theres a lumpy-ness like a missfire that begins. car drives fine and no water /oil loss, or real difference in fuel economy but failed the MOT on emissions! I've changed so farlugs, leads, cap, rotor arm, even tried from my spares collection a different Air Mass meter and ECU with no joy.. I've had a compression test done which is also fine???? unplugged most sensors and injectors which dont seem to change it? Pretty sure its electrical and must be heat related.??? Any idea's? It's a good old bus and really to good to scrap! Cheers Mark 760 GLE Auto V6 - 1990

Sep 8th, 2007, 01:05	#2
Jim760 Mr G Last Online: Jun 12th, 2020 19:11 Join Date: May 2007 Location: north yorkshire	a misfire and you thinking of scraping it? lol. sounds sounds like you have covered msot things, id be looking at the injectors now,, have you tryed a new air filter? and a good bloody blasting! __________________ will the jimousine ride again? previous models 940 TDI360 GLT 480 ES 740 GLE 940 SE 760 Executive 940 GL 850 GL 760 TIC V70 Torslanda

Sep 8th, 2007, 10:13	#3
griffin35 New Member Last Online: Sep 8th, 2007 21:01 Join Date: Jul 2007 Location: trowbridge	Thanks Jim, Yeah she's too good to scrap!!! Have unplugged each injector in turn, but the miss seems to travel around the engine like the compression test which was spot on, and didnt change on any injector being unplugged??? To me thats what confirms heat and electrical as the issue??? Air filter is good and it starts up fine - but I'll disconnect it and give a try. Cheers Mark

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)