MBE Programming port

[Petrolhead]

Cheers for that Carl

 

How did he get round the problem of the r500 map being locked?

 

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[rj]

You can always load a new map into an 967 - much more difficult with the later ECUs

[Paul Deslandes]

Try 1111 as the access PIN. This won't work with CC sourced OE ECUs but usually gives you access to MBE units where the PIN has been set. As RJ says, you can reprogramme a 967 without the PIN but you have to entirely erase the existing map and have another one or copy to replace it with. Don't try this at home unless you know what you're doing 😳

 

With the engine at idle, the TPS voltage should be around 370mV although this can differ depending on who set up the ECU and the TPS Index curve. Whatever the voltage is, the TPS site number should be zero at idle and the voltage and the site number should remain stable and constant until you touch the throttle. If the voltage is noisy and the site number is varying to any degree then you may have a faulty or loose throttle pot which could explain your misfire and rich running symptoms. My first TPS lasted about 10 years and 30,000 miles so, at 75k, yours could be on its way out.

 

Paul

 

 

[Petrolhead]

Cheers Paul

 

75K, not sure where you get that from.

 

I belive the car has only dome about 5k on its current RB setup

 

Anyone got a spare tPS I can borrow?

 

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[Paul Deslandes]

no, I'm not sure either 😳, must have another thread I've been reading. It should be fine after only 5k miles but worth checking the idle settings and absence of fluctuation.

 

 

[Petrolhead]

I will check aqnd record it in action so you can have a look as well

 

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[Carl]

also try 8654 which seems to be the other regular code used.

[Petrolhead]

here is the small video

 

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[Paul Deslandes]

hard to be sure from the video as I can't make out the throttle pot voltage but the site value/dial looks to be jumping around rather a lot, suggesting a dodgy throttle pot. I assume that the early part was at idle and you then moved the throttle a bit to increase the revs. Did you note the tps voltage and by how much it was varying? If you can get hold of another pot to try it might be worth it. You will need to adjust it correctly so note the tps voltage with the engine not running but ignition on so you can adjust the new pot to the same static voltage. I'm assuming that your throttle pot is secured with two screws and can be rotated when these are loosened.

 

Paul

 

 

[Petrolhead]

Thanks

 

Two screws but the holes are not elongated

 

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[Paul Deslandes]

hmm. There must be a way of adjusting the TPS voltage at idle but I'm not familiar with the roller bodies so someone else will have to let us in on how its done. The standard throttle body TPS pot has elongated holes (slots) so that the body can be rotated through about 30deg for adjustment. Sounds as though the roller bodies may have a different arrangement.

 

here

 

Edited to say that maybe the pot body holes are elongated but the clamping plate on top isn't, and doesn't need to be as the pot rotates beneath it.

 

 

Edited by - Paul Deslandes on 14 Apr 2010 21:08:28

[rj]

Adjust the map to suit...

[Paul Deslandes]

yup, that's right. I checked with Steve G. yesterday and no adjustment apparently other than by shifting the index curve if necessary to match the closed throttle voltage to site 0.