RR V8 Lumpy Tickover !!

My 2002 V8 petrol is a bit lumpy on tickover , previous V8s that i have had were really smooth so I was wondering if anybody had any ideas ........ it's also a wee bit "jerky" at constant slow speeds .

During idle, I noticed a slight rattle occasionally from one of the 'cats ( nothing really noisy , just an occasional "tinny" rattle) and I am wondering if that is the problem .
Apart from that the performance is great and it accelerates reall well ......................
any assistance would be welcome

As a 2002 car it could be a P38 or an L322 - which is it ?

oops ! IT'S A P38a

thanks

OK,with a P38 the condition of plugs and leads is very important.A fresh set of genuine leads and new NGK BPR6ES plugs will do wonders for smooth running.

Thanks , I'll check them out..........

I read somewhere, when fitting new plugs to 99MY engines ,you must not adjust the gap !!
Is this correct & if not what should the gap be ??

I am presuming 99MY is year of manufacture .............. or is it ?

mallard

I have checked my spark plugs and they are new ( just been replaced on a service by the stealer ) they are NGK PFR 6N ............. But I have been informed that they should be NGK BPR 6ES, Should I replace the PFR 6N ............( 2002 p38 4.0 ) ????

another question from a newbie >>>> what does 99my stand for ,as I have seen it where applicable, for certain spares etc ??

Might be worth a look at my post here on another forum. But as mentioned plugs and leads are definatley a good place to start. Check for arcing on the leads when she is running by parking up somewhere realy dark and having a good look around the coil packs. A mirror on a stick will help.

99MY stands for 1999 Model Year. In the Rangies case, it's when they changed a few things on the car from major such as the intake and injection system (from 'GEMS' to 'THOR') to minor such as the make of stereo (from Clarion to Alpine). Probably a host of other things as well I'm not aware of. It was all done at the end of 1998 / beginning of 1999, hence the term.

Thanks for the info , I will investigate further

BUT does any body know the difference between NGK PFR 6N & NGK BPR 6ES and which ones should I use ????

Thanks in advance

after 99 it was the pfr 6 n before 99 it was the bpr, i dont know the difference but there you go!!!

data is here...

the gap on the bpr is .9mm and on the others is pre set!!

and MHM is a fuk nut!!!

The PFR # is for a Platinum plug,the BPR # is a standard NGK plug - which is all you need,if the original PFR plugs are worn out just use the BPR's.They may not last the 72k miles that the service interval asks for but they wont weld themselves into the thread either.Another plus is the smaller gap requires less voltage to fire so puts less strain on the leads/coils etc.

Many thanks .............. all clear now