super4 wrote:

do you think EAS v4 it can do things like reset idle of the TPS ?

The blurb clearly states that it can reset adaptive fuel values so if it can't reset the TPS, I'd ask for my money back. TPS idle voltage is one of the adaptive values along with long and short term fuel trims.

GEMS (Lucas Generic Engine Management System) is only partially OBD compliant so doesn't log misfire codes so the EAS V4, Nanocom or a generic code reader won't show them. It might report too rich or too lean codes as a result of a misfire but that is about all. As full OBD compliance didn't become mandatory in the EU until 2000 I strongly suspect that is why the Thor version was developed with an ECU that is fully compliant.

When the throttle is fully closed the butterfly should be exactly at right angles to the intake so it is closing it off fully (or as best it can). If the stop or part of the linkage that bears against the stop wears, it will allow it to go beyond fully closed so start opening the opposite way. So you will have a partially open throttle which, as you press the pedal will first of all close before it starts to open again. Nothing, other than your right foot, controls the throttle opening. Idle speed is controlled by the ECU so with the throttle closed so no air passing through it and the closed throttle voltage from the TPS being correct, it will adjust the IAV to get the idle speed correct. If there is air getting through the throttle butterfly it will simply close the IAV a bit more to keep the idle where it should be (RAVE says idle on a GEMS should be 700 +- 20 rpm but reading the settings on mine, the ECU is set for a base idle of 625 rpm). As you open the throttle, the butterfly starts to open up, the TPS voltage rises and the ECU tells the IAV to open to give instant throttle response. If the butterfly has gone over centre, the throttle is actually closing initially but the TPS voltage is rising so the IAV has to be opened much further to try to get the revs where the ECU is trying to get them to. Then you get a slight hesitation on tiny throttle openings before the revs rise further and you'll find it virtually impossible to hold the revs at 1,000 rpm for instance, it will be at idle or higher than that as you can't balance the butterfly opening and TPS voltage to achieve those revs. Admittedly, at 120k miles, I wouldn't expect the stop to have worn but you never know.

and of course you aren't programming the fob to match the car but programming the car to match the fob(s) so you'd have to swap the blades over and you'd never be able to get a replacement fob if you ever needed one as it would no longer match the VIN. As Marty says, it can be done but is probably likely to cause further problems down the line.

Steam cleaning the engine is possible and shouldn't harm any of the sensors if you are careful. Where you don't want any damp is in the fusebox or ECU.

The main dealer were probably assuming the high idle was due to the throttle butterfly either sticking open or the stop having worn and allowed it to go over centre. In the case of the latter you get a flat spot at very small throttle openings as it is fractionally open, then closes before opening again. There's nothing about it in the P38 version of RAVE but there is in that for the Classic. I had to give mine a tweak at around 300,000 miles. The stop is loctited in so takes a lot of force (feeling like too much) to get it to move and it is only a tiny hex (2mm from memory but maybe 3mm). Page from the Classic manual is below but bear in mind if you do decide to do it, you'll need to reset the TPS again.

The gasket is only a thin paper one to prevent an air leak. I've never had one either and just put a smear of grease on the back of the TPS.

No, I got it the wrong way round. Zirconia are standard 0-1V and used on the Thor, Titania are 5-0V and used on GEMS. Chris needs Zirconia, so needs to have a black, a grey and two white wires. What confuses me at times is that my GEMS has both, the two standard 5-0V Titania to drive the petrol system and a 0-1V Zirconia to drive the LPG system. Confusing but it at least means I have two totally independent fuel systems so if one packs up it doesn't affect the other.

Dave, if it's an early latch with the three separate switches, CPC Farnell do them but, as Marty say's, if it's the later one with all three potted together as a block, then you'd need to improvise. If it's a drivers latch you have, one from an MGF is the same and interchangeable. The Ascot had burnt out central locking motors on both front doors and I got a pair of latches from an MG to cannibalise. Passenger one is different and only has one microswitch but the drivers one is only slightly different (one extra wire which you can snip off and ignore) but will fit and work fine.

If the sensors have a black, a grey and two white wires, they are Zirconia and only suitable for GEMS, if they have a black, a yellow, a red and a white, they are Titania and suitable for a Thor. If you've got the wrong ones in it will have detected sensor values that are out of spec and be running a default (rich) fuel map. When you come to the MoT, the emissions will be high so a fail.

If it isn't, elongate them further. It needs to move clockwise as you look at it from the front.

They mount using the studs straight through the mounting plate on the chassis with a couple of nuts (which invariably have to be cut off with the angle grinder if you want to change one). The studs are usually just bolts pressed through the plastic so could probably be pressed out if you had to. The instructions would be far clearer with a picture.....

It clearly says that it will do the adaptive reset but what it doesn't say it will do is show live data so you can't see the lambda sensors flip flopping as they should, you can't have a readout of revs against air flow, etc, all useful things to have when trying to do diagnostics on a modern fuel injected car. I've owned my P38 for 7 years now and for the first 5 I used the free EASUnlock software and a generic code reader, which would do live data, before buying the Nanocom. I bought it solely because it could reset the adaptive values (so I could set my TPS back where it should be and not twisted round on elongated mounting holes to get round the very same problem you currently have) and also read faults on the HEVAC, ABS, SRS and BeCM.

The problem you have currently is that when you first start it the idle air valve is at the default position for idle, then it reads from the TPS, sees a higher voltage, assumes you have given it a bit of throttle and opens it up to give you the high idle. Stop procrastinating and take a drill to the mounting holes. You can always reset it back to where it should be once you have the ability to reset the values.

He's not got duff readings so gearshift won't be affected. His readings are correct other than the minimum value expected can't be achieved by the TPS so while the ECU is expecting to see something in the region of 0.4 - 5.0V it can only output 0.7 - 5.0V so at idle it's wrong but correct everywhere else. What he will find is that with a high idle, downshifts will be clunky.

Lpgc wrote:

Curious then, does disconnecting the battery on Gems reset some adaptive values?

No, as said, all it resets is the windows, sunroof and radio, adaptive values stored in the GEMS unit are stored end of. Holding the throttle open won't do anything either as the problem is a high idle not low. The TPS value stored for closed throttle has remained but by mucking around with an incompatible TPS he's caused the value at closed throttle to be set lower than the TPS is capable of supplying. So GEMS thinks the throttle is partially open all the time and is opening the IAV to act as a progression jet. I caused the same problem by starting the car with the TPS disconnected so it saved the low value (i.e. zero) as closed throttle so as soon as I plugged it back in the 0.7V was seen as throttle open. Seems it will self adapt downwards but not upwards.

I doubt it as that is just an RS232 to OBD cable with no active components at all. I suppose it's always possible that the interface in the cable is just a USB to serial adapter built in but I doubt it or you could use a straight cable and separate adapter. It's probably very similar to the Chinese copy Opcom unit I've got to talk to Vauxhall/Opel cars and the similar one I've got for Vagcom (VW/Audi) and they aren't interchangeable.

The cable shown on his website does appear to be a USB to OBD cable with the built in interface and it does say that it is a specifically designed hardware and software product so I suspect it won't work without the cable.

Direct from Storey http://www.rswsolutions.com/index.php/range-rover-p38a/range-rover-p38a-eas-unlock-v3

Comes with the required cable but that will be sent by post so might arrive before Christmas.....

Orangebean wrote:

WTF didn't Mr Tune Right plug in and reset there and then?

Because like everyone else, he can read and reset fault codes but almost certainly can't reset the adaptive values. But you would have expected him to have plugged in his machine and proved he can't do it*. As OB says disconnecting with battery and leaving it for a minute, a day or even a millennium won't reset anything other than the windows, sunroof and radio. Get the drill out and elongate the mounting holes in the TPS so you can turn it. It WILL work guaranteed.

• In saying that, I got an email from Mymystery yesterday. She's just outside Paris so in what you would consider to be a reasonably civilised area but it's only taken 3 months of cancelled appointments and excuses as to why they can't do it that day to get her wheels balanced FFS.......

I've found that a microswitch that is on it's way out will fail more often in hot weather. Probably something to do with thermal expansion. Until I changed the microswitches in my drivers latch I used to get dancing locks but only when it was very hot.

Doesn't explain problems in Yorkshire though.....

Maintained and in great mechanical condition is normal for piece of mind, leak free is like wishing for a white Christmas, it may happen once in a while but it'll never last and you certainly can't rely on it.