Baldwin02002 wrote:Hi, there is couple of things that might be causing this. I once had the same problem with one of my customers. The idling was bad and the TB could not be adapted. Only to find out that an accelerator cable adjustment was too tight on the TB. I had to loosen it a bit so that the TPS motor can run a test on the TB when you switch on the engine and that is an ADP RUN. Then i could run an Adaptation and the problem was resolved. But clear all the errors first so that new errors could be registered.
If the above is not an issue he needs to go to Engine adaption before doing anything to monitor TB angle and manifold pressure, enter 00 then save the adaption to reset all the engine devices to the defaults. Then measure groups. He should check the TB angle. I think on idle it should be on +-6 degrees and it should show 880 or 920 rpm which is normal on MP9. Then he should also check the manifold pressure if it is on the same level. I can’t remember the actual value on the pressure as it depends on the engine size.
Let the car idle until the cooling fan turns. Groups to monitor this shoud be between 0 and 20. The timing angle should read 6.5 degrees. Rev the engine and check if the TB angle will go down to the right idling degrees. Also monitor the manifold pressure to check if it will rise and go back to the right idling manifold pressure. If the manifold pressure is giving you different values it might be a leak or the throttle body. If the TB angles are changing constatly it should also be changed. Run TB adaption to see if it will fail before changing the TB. Also monitor inlet manifold temperature and the coolant temperature. TB adaptation adaptation group is 98 on MP9 and 60 on most newer cars.
Hope this will help....
Correct , a cable that is too tight can sometimes prevent the throttle plate from moving back and forth ..
You clear all errrors first so that you can perform adaptions - otherwise you wont be able to adapt at all.
You dont need to reset all the internal memory registers.
One can not look at timing on idle nor TPS position
MP9 idles at 920 +/- 20 rpm
Manifold pressure at idle depends on the camshaft/camshaft timing ie valve overlap at TDC