RR 4.6 hesitation

[MOD500]

Hoping for some help from the PH massive please

RR 4.6 HSE, T-reg, 50k miles

Under constant throttle, e.g steady cruising, the engine has a slight misfire that can be felt as the engine hesitates for a split second.

Car had plugs changed 2k miles ago (plus service carried out), this issue has only surfaced in the last 800 miles or so. Was thinking maybe the leads need changing, and/or distributor cap?

Cheers


Martyn.

Edited by MOD500 on Wednesday 2nd January 10:00

[eliot]

It could be the leads.

[BLUETHUNDER]

MOD500 said:

Hoping for some help from the PH massive please

RR 4.6 HSE, T-reg, 50k miles

Under constant throttle, e.g steady cruising, the engine has a slight misfire that can be felt as the engine hesitates for a split second.

Car had plugs changed 2k miles ago (plus service carried out), this issue has only surfaced in the last 800 miles or so. Was thinking maybe the leads need changing, and/or distributor cap?

Cheers


Martyn.

Edited by MOD500 on Wednesday 2nd January 10:00

There is no distributor.They work on coil packs.Check the obvious lead,s,duff coil pack etc.If not then dig further check your water levels.I know you may think this sounds silly but when i had the porus block issue,the first sign was lumpy running.

[agent006]

Mine had a similar problem. Slight misfire to start with. The death sign on mine was the rev counter going silly during the misfire.

[MOD500]

Thanks for the replies

Hope it is the leads, a porous block sounds bad No excess water usage 'tho I don't think.

Will order some new leads from a specialist, any particular ones to go for, or are the OEM ones good enough?

Thanks again.


MOD.

Edited by MOD500 on Friday 4th January 13:12

[agent006]

MOD500 said:

Will order some new leads from a specialist, any particular ones to go for, or are the OEM ones good enough?

Magnecor. Bit more spendy but very good.

Edited by agent006 on Friday 4th January 13:37

[Bish]

Had the same problem on a P38 where the leads where shorting onto the block or some part of teh engine and causing it to run a little rough. Changed them and it made a huge difference to the smoothness of the engine.