Vehicle & Technical > Range Rover

low rev stutters, p38 4.0

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woz:
I have a 99 p38 4.0 ex police rangie. Its in good nick and runs well. BUT......
when on tickover, you can hear a Ticking noise, not the head gasket, but something like the manifold or a leak on the exhaust. When running it goes fine, but when in top gear, at 35mph or 40 mph, add a little gas to speed up, ( not kickdown)
the engine seems to stutter, and sometimes a small backfire can be heard. Once down a gear, or press further to kickdown, the stutter goes and the engine powers on as normal.
I am an amateur in these areas, i thought the manifold had a leak or the exhaust. but on further research could be the air flow meter or map sensor??? (not sure what that is).
Anyway, just wondered if anyone out there had the same problem or any ideas.
Any advice is greatly appreciated.
Cheers :huh:

Range Rover Blues:
Ticking noise amongst other things could be exhaust or head gasket leak, either of these would get worse when under load.

Not sure but a ticking noise could be a slipped liner, could also be a worn valve lifter.

Does it sound mechanical or like a high pressure leak (AIR JET)?

woz:
The ticking noise, sounds almost like 'tappets', i know that sounds crap, but once moving the noise fades.
i've briefly looked around the manifold gaskets, can't find a leak. I don't think its the head gasket, again no leak, i've seen a video on you tube with some guy whose 4.6 has a leaking HG, it doesn't sound like that at all.
There is a slight leak on the exhaust on the join just after the cats, but that shouldn't cause any problems??
I recently took the beauty down to cornwall on holiday and it went like a dream, but the slight ticking was always there.
Someone has looked after this car very well, the engine bay is very clean, no signs of anything leaking there.
Sorry if i'm a bit vague.
Thanks for replying.
Cheers

Range Rover Blues:
No No that's fine.  Tappets is another possiblity.  With hogh mileage camshaft the profile of the cam goes "off" because theyr are tappered slightly front to back.  thsi means the tappet runs on it;s edge against the back edge of the cam lobe so that it spins.  When the lobe wears it runs on the centre and doesn't spin, so it doesn't scavenge oil and therefore lifts slowly.

Does it drink a bit? high fuel consumption is a symptom.

Also could be a weka or broken valve spring, almost certainly a head off to fix job.

Now if it's present on over run as well as under load then it's truely mechanical, if it goes away when you lift off then it's something else possibly.

Loads of things it could be, hard to say without listening.

woz:
 To be honest its pretty good on the fuel (if thats possible!!!) when you lift off it doesn't stutter.
Starts ok after being left for a couple of days, and runs along ok.
Ill keep looking,i'll find out what it is eventually.
Thanks for the advice, much appreciated

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