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I'm changing out the throttle body on my 1999 C-4 with e-gas next week and was wondering what to expect. I looked in the DIY forum and here but did not see a posting that describes it. Can I re-use the bolts? Does the ECU (DME) need to re-learn the new throttle body? Any special tools needed? I'm changing it out because its making lots of funny noises and does not behave well when cold (surging hesitating) codes are P0102, P1503 and P1506, once it warms up all is fine. Already replaced MAF with no change. Any information is much appreciated.

Thanks, Jerry

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I'm changing out the throttle body on my 1999 C-4 with e-gas next week and was wondering what to expect. I looked in the DIY forum and here but did not see a posting that describes it. Can I re-use the bolts? Does the ECU (DME) need to re-learn the new throttle body? Any special tools needed? I'm changing it out because its making lots of funny noises and does not behave well when cold (surging hesitating) codes are P0102, P1503 and P1506, once it warms up all is fine. Already replaced MAF with no change. Any information is much appreciated.

Thanks, Jerry

I think that you already know all the answers that you need :) for sure I can tell you that you can keep your bolts!

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I'm changing out the throttle body on my 1999 C-4 with e-gas next week and was wondering what to expect. I looked in the DIY forum and here but did not see a posting that describes it. Can I re-use the bolts? Does the ECU (DME) need to re-learn the new throttle body? Any special tools needed? I'm changing it out because its making lots of funny noises and does not behave well when cold (surging hesitating) codes are P0102, P1503 and P1506, once it warms up all is fine. Already replaced MAF with no change. Any information is much appreciated.

Thanks, Jerry

In the category of "I am just guessing here": Are you sure that your Motronic 5.2.2 ECU is capable of handling the e-gas throttle body? I thought that e-gas was only supported on Motronic 7.2 and newer.

JP

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In the category of "I am just guessing here": Are you sure that your Motronic 5.2.2 ECU is capable of handling the e-gas throttle body? I thought that e-gas was only supported on Motronic 7.2 and newer.

JP

You are correct.

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Yes, it is a Carrera 4, so Motronic 7.2, I'm sorry if I wasn't clear enough. I swapped out the throttle body this afternoon, it took about 15 minutes and is a very straight forward swap. The gasket is also very simple to swap out. I drove the car this afternoon, it had been parked for four days and no surging or hesitation at all (first time in ages without cold start issues.) I will drive it in the AM when it will be around 45 degrees and see how it behaves but I believe the electronics (throttle jacking unit) incorporated in the throttle body was the culprit. The throttle body was actually reasonable for a porsche part, around $220. If I still have issues in the AM then I'll report back, if not, problem solved! Thanks for the input.

Jerry

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