Cold start Idle issues after P12 install.

[HelmHoltz]

I have a problem with my Idle going up and down until warm-up. Yes I replaced the FITV with a new one from the dealer! Is there any fix or do I need to live with this if I want to run the P12?

[1990exr]

My p12 runs fine on my a4, I would try spraying a flammable spray around your
vacuum lines to check for a vacuum leak of any kind.

[HelmHoltz]

My p12 runs fine on my a4, I would try spraying a flammable spray around your
vacuum lines to check for a vacuum leak of any kind.

Not sure if it makes a difference, but my P12 came out of an Automatic and I have a manual. I dont have the problem with my stock ECU? I will take your suggestion though.

It only acts up until warm-up then it is smooth as a kitten.

[dj_ender]

Not sure if it makes a difference, but my P12 came out of an Automatic and I have a manual. I dont have the problem with my stock ECU? I will take your suggestion though.

It only acts up until warm-up then it is smooth as a kitten.

Lol, you answered my question. Yes, that is exactly your issue. When I installed my auto PT6 into my manual A1, I had idle issues, both at cold start and at lights. The idle also "stepped down" from 1k to 750 RPMs when I drive around. I even noticed a mpg drop as well.

[HelmHoltz]

Lol, you answered my question. Yes, that is exactly your issue. When I installed my auto PT6 into my manual A1, I had idle issues, both at cold start and at lights. The idle also "stepped down" from 1k to 750 RPMs when I drive around. I even noticed a mpg drop as well.

Well then I will need to keep checking Pick-in-Pull weekly and grab a P12. The go very quick once the Prelude hits the ground. Most of the preludes are SI versions.

[dj_ender]

Well then I will need to keep checking Pick-in-Pull weekly and grab a P12. The go very quick once the Prelude hits the ground. Most of the preludes are SI versions.

They tend to go fairly quickly around here too.

[1990exr]

It is also possible to convert an auto ecu to a manual ecu, as long as you're able to solder and have the proper tools. Just look up p12 auto to manual conversion. I've read a little bit about this and the info I've read says that it's just as easy as converting a p13 from auto to manual, if it is an auto ecu it should have a jumper at rp11 and manual needs to have it at rp12.

[HelmHoltz]

It is also possible to convert an auto ecu to a manual ecu, as long as you're able to solder and have the proper tools. Just look up p12 auto to manual conversion. I've read a little bit about this and the info I've read says that it's just as easy as converting a p13 from auto to manual, if it is an auto ecu it should have a jumper at rp11 and manual needs to have it at rp12.

Wow I will look at the ecu tonight! Thanks Found it! http://wikitest.pgmfi.org/twiki/bin/...1P13AutoManual

Most Auto Ecus have a jumper at RP11 and have a blank space at RP12. Move RP11 to RP12 and you now have a Manual ECU. Here a closeup of the JDM Jumper configuration: Auto Jumpers


R96, C49 and R82 seem to be related to some Auto trans controls but can be left in place.

Some ECUs (Like the JDM P13-900) have resistors in both places. You can just remove both of them and replace RP12 with a jumper wire.

This applies to all ECUs that share the same board (P11, P12, P13, P14 and P39)

http://wikitest.pgmfi.org/twiki/pub/...-resistors.jpg



Update: Moved jumper runs amazing, idle issue is solved. Thanks for the help.