RR classic EFi 3.9 'dies' temporarily on kickdown

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joe1972

joe1972

Well-Known Member
Posts
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Location
Manchester
Hi folks,

Not long bought my second Range Rover. This one's a bodtailed pickup type with lots of off-roading prep done on it, though weirdly it has the auto box (would've thought a manual make more sense for off road??). However, I feel I got a real bargain.

The only thing wrong is the engine dies where the other RR classic i got would go into kickdown. The engine runs well and smooth and if I lift off after it picks back up again as if it's not died.

I'm guessing kickdown relay?? Don't know where it is, or if indeed it is this relay. It's seems odd that the engine starts runs and pulls fine. I can drive around the kickdown issue, particularly as the tyres are such high profile with aggressive tread, and the car has bags of suspension lift done to it, but would be nice to have that kickdown if ever needed.

Would appreciate any help & advice?

cheers,
Joe
 
It's a 3.9EFi The intake ducting between airbox and plenum has recently been replaced as I thought it might be this myself. Its the only 'actual' thing I've done, but hasn't seemed to have changed it, other than replace filter and check snorkle to airbox connection.
Are there any other areas I should also look at?
thanks Derek.

cheers,
Joe
 
It's late. I didn't 'see' the 'Classic EFI 3.9.....:rolleyes:

The only other immediate thing that comes to mind is cleaning the MAF using carb cleaner. Not something I've ever done on mine so I can't tell you how to do it (other than squirting the stuff in there) but previous posts on here have reported an improvement when they've had problems. These have usually been 'rough' running problems though rather than a flat spot. The other culprit of course could be the TPS - throttle position sensor. At full throttle, the injection system should give a greatly enriched mixture by lengthening the injection pulse. Possible flat spot here if this wasn't happening? No idea how much these are but it may be one of the cheapest things to try.
 
I'll give the MAF a clean in the morning. Not done a RR one before though have cleaning Vauxhall ones. I hadn't done this as I didn't think this would affect the problem....its not really a flat-spot like I've felt before, it actually feels like someones turned the ignition key or pulled the dizzy cap off.
 
check yer timing too, can cause a nast flat spot if its off.

also how is the kick down cable? is it adjusted correctly?
 
Thanks guys...

Just come in for a cuppa. The MAF is now clean, timing is now spot on. No difference (although generally more responsive as the timing was off slightly and distributor was in need of lubrication)
Next thing to check is kickdown cable. Will let you know.

cheers
 
Cheers. Looks like it was the cable. Problem solved....though I go distracted with other jobs. The distributor needed some TLC anyway, hence why I checked and adjusted the timing. Just replaced the belts too....then went on to the manifolds (blowing at the downpipe join, one was damaged around the area and the other only had two studs). Replaced them, got halfway through the job then remembered that whilst I have new manifold-head gaskets I didn't have any manifold-downpipe gaskets. :doh: Well, bolted it together dry anyway, still better than it was, and will get some ordered.
...getting there with it. Next job (once downpipe gaskets sorted), wheel bearings (the last owner said he'd done the front ones, but one front wheel has play, so hell knows what he's done)
 
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