Thread: Severely Delayed Throttle Response - 2000 Disco 2 TD5 Auto

What are the m & s lights doing whilst you've got poor throttle response ? With SWMBO's D2a flashing m &s lights meant the xyz switch (inhibitor switch) on the transmission had failed. In 275 000 KM we've replaced it approx. five times .

Deano

Originally Posted by DeanoH

What are the m & s lights doing whilst you've got poor throttle response ? With SWMBO's D2a flashing m &s lights meant the xyz switch (inhibitor switch) on the transmission had failed. In 275 000 KM we've replaced it approx. five times .

Thanks for the reply Wow, 5 times, that's bad!

The M and S lights are almost certainly unrelated to the throttle situation. The first time we had the problem with the M and S lights flashing, I pulled the XYZ switch out and pulled it apart. It didn't appear to have any water inside it, but I cleaned it out anyway and sealed it back up with silicone, so there's definitely no water inside it. It was all working fine after that, but a few months later the M and S lights came back on.

The M/S lights show no relation to the delayed throttle response whatsoever. We've had the delayed throttle as far back as I can remember, and we've own the car for several years now. The M/S lights issue is comparatively recent (within the last year or so) and the delayed throttle still occurs regardless of the M/S light status.

David

You might need to find another member with a Nanocom to read any codes.What location are you in? So that someone might read the codes for you.

Yes I'd be checking the MAF sensor as first port of call.

It is found on the engine side of the air filter box. A quick test is to unplug the electrical connector attached to it and take the car for a run. If it goes ok then it is likely to be the sensor. From there getting access to a nanocom and looking at the airflow readings and/or testing MAF resistances with a multimeter, will confirm the diagnosis.

It also never hurts to check the wiring from the sensor to the ecu for damage either.

Cheers

Steve.

Also if the wiring across the front of the head has lost its insulation then the power wire for the MAF may have shorted and blown the fuse.

Originally Posted by SPROVER

You might need to find another member with a Nanocom to read any codes.What location are you in? So that someone might read the codes for you.

Northern Tablelands, NSW, around half way between Glen Innes and Tenterfield. We've been considering purchasing a Nanocom ourselves with the amount of faults we've had, but they're awfully expensive

Originally Posted by Rok_Dr

Yes I'd be checking the MAF sensor as first port of call.

It is found on the engine side of the air filter box. A quick test is to unplug the electrical connector attached to it and take the car for a run. If it goes ok then it is likely to be the sensor. From there getting access to a nanocom and looking at the airflow readings and/or testing MAF resistances with a multimeter, will confirm the diagnosis.

It also never hurts to check the wiring from the sensor to the ecu for damage either.

Excellent, thanks. I'll give that a go tomorrow morning right after we finish stripping the tailgate latch mechanism apart, fixing it and putting it back together

Originally Posted by Graeme

Also if the wiring across the front of the head has lost its insulation then the power wire for the MAF may have shorted and blown the fuse.

That's a possibility, but even if that is the case (that the insulation has rubbed through), it probably hasn't blown a fuse because just occasionally everything works and there's no delay in the throttle. I'll certainly give a good going-over, though.

Thanks for all the help, guys! I'll see if I can't get our wonderful Land Rover working like new tomorrow

I wonder if you have 2 separate problems. the M&S lights are transmission related, but can be affected by the MAF.
The delay to me could be a dirty MAP sensor. This sensor is located on the inlet manifold and tells the ECU how much boost is being developed and if dirty could become sticky. It is easy to get at by taking off the engine cover undoing 2 screws and a plug. Spray some electronic cleaner into it but do not attempt to dig out the carbon that comes from the EGR with anything solid.
It costs nothing and takes 10 minutes so is worth doing.
Regards Philip A.

Originally Posted by PhilipA

I wonder if you have 2 separate problems. the M&S lights are transmission related, but can be affected by the MAF.

That's what I assumed, but I put the information about the M&S lights in there in case there was the unlikely possibility they were related to the delayed throttle somehow.

Originally Posted by PhilipA

The delay to me could be a dirty MAP sensor. This sensor is located on the inlet manifold and tells the ECU how much boost is being developed and if dirty could become sticky. It is easy to get at by taking off the engine cover undoing 2 screws and a plug. Spray some electronic cleaner into it but do not attempt to dig out the carbon that comes from the EGR with anything solid.
It costs nothing and takes 10 minutes so is worth doing.

Hmm...so there's two possible sensors that could be causing the issue. The MAF and the MAP (which I assume stands for manifold pressure). Excellent, gives me something to check right now; I can only check the MAF by starting the car and taking it for a test run, which I can't do right now with the tailgate latch in pieces

So the MAP sensor can be damaged easily with physical cleaning, then? Just in case I happen to break it, what prices would I be looking at for a new MAP?

David