4.0 Random misfiring on 4 cylinders

Iaranicki · Jul 30, 2012

Hi,
Here's the new problem.
I have my RR that runs on 4 cylinders but with no particular reason would return to normal 8 cyl firing.
My first suspicion was on the coils but they were changed few months ago
is it possible thant the ECM is the cause?
Any suggestion is welcome
Ivan

Saint.V8 · Jul 30, 2012

What are the symptoms??

How do you know it is missing on 4?

Which 4??

One whole bank, opposing cylinders, random cylinders, 3 on one and 1 on the other ??

Which year? GEMS or THOR?

fix it · Jul 30, 2012

Its the gogo valve change that n itll all be fine

Planny · Jul 30, 2012

Or Gangle pin causing flow to the wrong bank causing the other bank to get messed up & going AWOL

Iaranicki · Jul 31, 2012

Saint.V8 said:
What are the symptoms??

How do you know it is missing on 4?

Which 4??

One whole bank, opposing cylinders, random cylinders, 3 on one and 1 on the other ??

Which year? GEMS or THOR?

Tested the sparks it is not firinf the 2 center on the RH and first and last on LH.
It is a 1995 Gems
Ivan

StuckAgainSteve · Jul 31, 2012

Iaranicki said:
Tested the sparks it is not firinf the 2 center on the RH and first and last on LH.
It is a 1995 Gems
Ivan

If you mean RH as looking at the engine from the bonnet then coils 2 and 4 are not firing. If you mean RH as in driver's side, then coils 1 and 3 are not firing.

stopover · Jul 31, 2012

Iaranicki said:
Hi,
Here's the new problem.
I have my RR that runs on 4 cylinders but with no particular reason would return to normal 8 cyl firing.
My first suspicion was on the coils but they were changed few months ago
is it possible thant the ECM is the cause?
Any suggestion is welcome
Ivan

Ignition coil multiplug not pushed all the way in?

stopover · Jul 31, 2012

Iaranicki said:
Hi,
Here's the new problem.
I have my RR that runs on 4 cylinders but with no particular reason would return to normal 8 cyl firing.
My first suspicion was on the coils but they were changed few months ago
is it possible thant the ECM is the cause?
Any suggestion is welcome
Ivan

Ignition coil multiplug not pushed all the way in? if its a gems? Same thing on a Thor, but there are two multiplugs, one to each coil block.

stopover · Aug 21, 2012

Iaranicki said:
Hi,
Here's the new problem.
I have my RR that runs on 4 cylinders but with no particular reason would return to normal 8 cyl firing.
My first suspicion was on the coils but they were changed few months ago
is it possible thant the ECM is the cause?
Any suggestion is welcome
Ivan

So did you fix it?

4.0 Random misfiring on 4 cylinders

Iaranicki

New Member

Saint.V8

Dyed-in-the-wool 100% RR Junkie

fix it

New Member

Planny

New Member

Iaranicki

New Member

StuckAgainSteve

Well-Known Member

stopover

Active Member

stopover

Active Member

stopover

Active Member

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