Well after a few thousand miles I can report it was definitely the MAF. Running lovely now and fuel trims are back to sensible if not optimal values (+-20% of 0). I’m guessing this is because I have an unknown mileage 3.9 running on a 4.2 tune with no catalyst in the cats. Thanks for the help...

Hi all, Posted on car and classic but thought I’d put an ad here too if that’s ok? £2500. Nottingham England 98 Tdi ES Auto with 203500miles. Really good clean car that I’ve done 13000 miles in since 2021 and loved but don’t have need for now my Range Rover is finished. It’s not perfect and...

So the discovery is tentatively up for sale. As much as I’d like to take the time to finish it, we’d like to buy a house, three cars on the driveway here is tight, and I don’t really have the motivation at the moment to take it apart. Ad here And on this forum If the right buyer doesn’t come...

You've got me wondering now. I know mine were definitely reset yesterday and updated while it was idling after I swapped the AFM. Rich

Hitting the button in RoverGauge to clear the fault codes seems to reset it all too even if there aren’t any codes I think.

Just because it was playing on my mind, I had to go back out there and repeat another test I've done before. AFM diagnostic procedures. The AFM on the car was an unlabelled one with no cap on the idle CO screw. I've set this back to 1.8V before as it's supposedly meant to be for Lambda...

Thanks for the input. Done a little more diagnosing over an early lunch break... I've gone through the ETM diagnostic procedures for the oxygen sensors. I've verified that the fuel pump relay is working correctly on both the lambda heater and fuel pump circuits, and is of the correct type...

Thanks for the comment. I’m going to test the pressure again when I’ve run this tank down to see if there’s any difference in pressure. If so I’d guess that it’s an issue with the pick up in the tank drawing air or something perhaps. At the moment I’m leaning towards placebo to be honest on that...

Ok, so I’ve acquired a better manifold and swapped that with new gaskets to the head and down pipe - no more leak there. Lambda signals still haywire and idle no better. May actually be worse to be honest. Filled with fuel which I have noticed seems to make it a little better. Goes from about to...

I think you’re right that I should deal with the known issue first. It’s the logical way to move forward. I have a friend who’s main earner used to be motorsport exhausts and manifolds who recons we might be able to reface the manifold just with a linisher if it’s not too corroded. I’m using the...

Both were new genuine parts during the rebuild so less than 3500miles ago. I hope they’re ok. I have a fuel pressure testing kit arriving today so hopefully I can check the pump and regulator next. Manifold I think is a good next place to sort and then see where I go from there as you say...

Oh, I thought that the ground straps were more an indication of heat range and the ring around the top of the threads showed more about mixture. As I've probably said before I'm more comfortable with diesels to be honest. As for the manifold, I don't think it's so much warped as eroded...

Hi All, Been putting it off due to the photo upload issue but I've discovered a work around today by pasting into the editor rather than using the 'upload a file' button. Soon after my last message it got a 300 mile service. Oil, Filter etc and a little more. I stripped the entire inlet...

8 - 6 - 4 - 2 1 - 3 - 5 - 7 I dropped 3 on the floor and managed to smudge the ground strap. Must have landed strap up as the gap wasn't affected. Looking a touch rich? Rich

Well I've received a compression tester today - Mityvac MV5530 kit from Amazon - feels very good quality if anyone is on the lookout for one. Run a test this afternoon and the results are as follows... 1 - 170psi 2 - 165psi 3 - 160psi 4 - 170psi 5 - 145psi 6 - 160psi 7 - 170psi 8 - 165psi I...

Compression test may well be worth while then! If there’s anything up with the engine then it will be unceremoniously dumped and replaced with a 4.6. It’s already the wrong engine for the car so I’m not going to waste too much effort on it. Someone correct me if I’m wrong but I’m not aware of...

I think doing a compression and fuel pressure test might be worthwhile so I know a bit more what I’m working with wouldn’t it. I’m still 99% certain it’s an injection issue and 99.999% certain that it’s not ignition so you can guarantee that the engine itself will be in fine health and there...

Hi, Thanks for the message back. When I said id checked the MAF voltages I meant both the output and CO trim. Apparently the CO trim should be set to a specific voltage on lambda cars and have an anti-tamper cover. Mine doesn’t have this so I checked and set it to whatever it was meant to be...

Hi all, Still trying to get to the bottom of my running issues. Hotwire 3.9 V8 in a ‘93 Vogue LSE. Symptoms are rough running / stumble / intermittent random misfire at idle, rich smelling exhaust at idle and big mixture corrections. Runs pretty nice I think under any load. Reving cleanly and...

Well. Not been on here much in the last month really. Range Rover has been the sole vehicle in the house for most of December as my wife's car was written off. It's not had the care I'd have liked but it's kept going. Desperately need to get the alternator swapped over, deal with the swivel...