Misfire at 5000 revs
Discussion
Hi all was there a definitive answer to the misfire/backfire at around 5000 revs? I saw a thread when I googled it from a few years back where an Ecu change worked but hadn't previously but I think someone also fixed it with a new coil.
My 4.0 has started having this problem a few wks back, would obviously be nice not to replace stuff unnecessarily
My 4.0 has started having this problem a few wks back, would obviously be nice not to replace stuff unnecessarily
Tomm3 said:
Thanks, it's under load. Looks like I'll try a new coil.
I have a new spare, as well as a known working one. I must have the ignition amplifier too, as I recently changed to coil packsI see you live in Cambs and will be in Cambs myself on Monday and Wednesday, if you fancy trying one without having to lash out the cash. .
Email me if you want to meet up.
Tomm3 said:
Hi all was there a definitive answer to the misfire/backfire at around 5000 revs? I saw a thread when I googled it from a few years back where an Ecu change worked but hadn't previously but I think someone also fixed it with a new coil.
My 4.0 has started having this problem a few wks back, would obviously be nice not to replace stuff unnecessarily
I had that on my previous Grif it was cam lobe worn pulled ok up to about 5000 then broke down with a misfire.My 4.0 has started having this problem a few wks back, would obviously be nice not to replace stuff unnecessarily
Hope for you its just electrical and a cheap fix.
Have a look at the fuel pressure regulator as that what the issue was on mine, can't remember the figs now but on tinternet somewhere?
I've also had issues with the battery breaking down internally as the accumate charger seemed (used) to fry them after 2 winters on trickle charge?? No probs since swapped to very clever CTEK unit......
Cheers
E
I've also had issues with the battery breaking down internally as the accumate charger seemed (used) to fry them after 2 winters on trickle charge?? No probs since swapped to very clever CTEK unit......
Cheers
E
So the moral of the story is the system requires perfect connection when at its highest demands as in 5500 revs and anything that creates resistance is likely to be found out.
A partial connection will cause sparks and burn off the coating on plug lead ends. Often seen because they have gone rusty which always suggests a bad connection. if this arcing has damaged the leads they should be changed.
A partial connection will cause sparks and burn off the coating on plug lead ends. Often seen because they have gone rusty which always suggests a bad connection. if this arcing has damaged the leads they should be changed.
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