range rover p38

[simon smith]

ive got this prob when driving along , its like a little miss fire slow on power , like a lead has fell of . its worst on gas , cant get any speed up ....its a 4.0 v8 bosch engine on a t reg and clues

[miniman]

I used to have a teacher called Simon Smith.

Anyway, I digress. How recently has this started happening? If recent, have you whipped the dizzy cap off and hosed it all down (leads included) with WD40

[lost in espace]

Check the airbox lid is tight.

[BLUETHUNDER]

miniman said:

I used to have a teacher called Simon Smith.

Anyway, I digress. How recently has this started happening? If recent, have you whipped the dizzy cap off and hosed it all down (leads included) with WD40

There isn't a distributor. They have coil packs.

[plasticpig]

MAF sensor is a possibility.

[10mpg]

Coilpacks are a known problem on all P38's worth getting someone with testbook to read the fault codes, but the Bosch enegined ones had a specific problem with the HT leads causing mifiring, was the subject of a recall if i remember correctly..

I'd replace them as a matter of course if they are more than a few years old, but like i say get the codes read first (you will need a RR specialist with testbook to do this) most generic fault code readers won't tell you anything usefull.

If you're keen on doing a few things yourself first then clean the MAF with carb cleaner and inspect the coil packs for damage they often visibly crack on the base of the unit and leak what looks like melted plastic when they die, you can feel this if you stick your hand underneath them..

[simon smith]

hello . i have put new spark plugs in today but still the same prob , i will try out the other things tomoz and let you know . cheers simon.