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If it is stuck stepper it might rev to about 2k. I can't see how it could go higher if the throttle butterfly is closing properly. If you suspect stuck stepper I think I would be inclined to suggest you take off and clean the plenum and ram housing, while you're about it, check the throttle...

No, swapping them over won't allow it to start because if one is faulty you'll remove power from the fuel pump or from the ECU. Both need power for the engine to run. Pull the relays out and rig up a couple of test leads and put power on them and check for switching. The relays failing is not...

3AM MAF can be checked/tested using a digital volt meter. Do this first. The later 5AM air flow meter should be alright to use. I can confirm that it is possible for the ECU to have a fault that means it doesn't read the air flow meter in which case you will need a replacement ECU. Also, is your...

Before you jump in to code readers and diagnostics I would recommend learning to use a digital volt meter to check the EFI components and the ignition system. As for a code reader, search for Ecumate, great piece of kit imho.

Absolutely! My '91 breezes the emissions test, passed again just last week. You would need a noticeable engine/injection and/or ignition problem not to pass the basic emissions test but no way can you get the emissions to meet catalyst test limits, I tried just for a giggle and was close but...

An ignition problem could cause a lambda problem but there would be other running problems. The OP doesn't say if there is a notable misfire or stumble or even if it idles well or otherwise so it is (like so many) a bit of a needle hunt in the proverbial haystack. I would have to admit that...

If I understand what you have said, I think you have an O2 sensor problem and it is likely you have replaced loads of bits unnecessarily. I know you say you have new lambda sensors but have you checked they are actually working? The Lambda 100% trim is the clue. I recently helped a guy with a...

For what its worth I've had my '91 RRC for about 9 years now. It has been abused but it keeps going. Rust is the biggest issue, look carefully inner wings, A post, B post and C post. Check rear cross member, boot floor, front footwells. Check the electrics work. As for on road manners, never...

Dunno if this will help answer the question https://www.landyzone.co.uk/land-rover/time-for-surgery.296902/ but as already said, not really a difficult job but are you sure you need to do it?

I think it would be quite involved. I would think the whole heater box needs to come out and be swapped. Also, I think you need to look at the ECU for the fuel injection because the A/C load is supposed to cause the ECU to raise the idle speed slightly. Additionally, the A/C condenser fans need...

Just catching up on this one! Glad to hear it has been sorted and without the expense of a garage visit. Did you remember to reset your ecu? Just unplug it for a couple of seconds then reconnect or disconnect the battery if you fancy.

Let us know what they say. My heart tells me it is a small inlet leak somewhere.

Forgot to say, leaking exhaust might also cause o2 sensor to tell ecu it is too lean so dump in more fuel but that shouldn't cause stalling or idle problem when cold as the ecu doesn't look at o2 until warmed up a bit. Also, puzzled how your V8 can run for 10min with fuel pump switched off...

Back up a bit!!! Symptoms sound exactly like an inlet air leak somewhere. What happens is that it will fire up then the mixture goes lean so it dies, add a bit of throttle and the effect of the air leak is less pronounced so it will run with a bit of throttle if you see what I mean. I would be...

If I was only going to waste it by using it only on road then probably a V8. Personally I don't care if manual or auto. If I went for a Defender to play in the mud then I would think 300 TDi and probably manual.

All true! BUT........ they are enormous fun, simple to fix and keep you entertained for ages if your idea of fun is poking around for hours with a multimeter to find some obscure electrical glitch.

Hahahahahahahahaha, thanks Rod, glad I could help you out. Good luck with the IVA.

Sooooo..... went over to see Rod today, very interesting. He's got a really great car, a genuine Westfield V8, it has a bit of a back story but essentially it is as new, about 5 miles on the clock and to date has not been through its IVA. As he originally posted, there were idle issues and so...

Adri, I have been abusing my RRC for years and I know what does and doesn't work. If you search you'll find many will agree only genuine ignition parts will do, I don't know why exactly but pattern parts just don't do the job and can cause a variety of odd running problems. A compression test...

Clearly you no longer want or need my help. Hope it works out.