1G 4000 idle upon start up

[Ganmne]

Alright here's the deal I bought this 93 Talon TSI awd this summer. It started life as a turbo awd, but when I obtained it the car had a n/a six bolt and a 1990 harness. So I've went about getting all the necessary parts to take it back to turbo, and now that it is all back together I'm having problems.

When I start the car up it shoots up to 4k rpms(if I hit the gas pedal it acts like it is hitting a wall and won't go past 4500, but when the idle starts to fall I can hit the gas pedal and it will shoot back up to 4k rpms) and will fall all the way down and die. I have all the vacuum lines ran properly, and so far I haven't been able to find any leaks. I'm getting a new throttle body come Tuesday to test with so hopefully that will do the job but if you have any suggestions let me know.

Thanks
Nathan

 

[92AWDHX40]

Yes check the throttle cable it maybe binding or to tight, or loose.

 

[jayson427]

Are you using a n/t ecu? That might be your problem or you have a huge vacuum leak.

 

[okcummins]

It sounds like your throttle cable is set to tight or your idle switch is set to high. Something's got to be holding the throttle plate open. I don't think its possible for it to rev that high with the throttle plate closed.

 

[Ganmne]

No but I did more research and I need to switch to ecu pins and the cable is adjusted properly I did that yesterday

Two ecu pins*

 

[Ganmne]

An update I went over to swap the two ecu pins number 6 and 14, but come to find out I'm missing the wire to the ecu for Idle switch input would that have anything to do with this issue?

 

[Ganmne]

By replacing the throttle body gasket I got a different response, it now starts up goes to 3k rpm and then just dies any ideas?

 

[ra_guy]

I'm having a fairly similar experience, albeit on e85 and 1300cc injectors, and am curious how you were able to remedy your situation... Could you provide some input?

 

[chacedog1]

By replacing the throttle body gasket I got a different response, it now starts up goes to 3k rpm and then just dies any ideas?

do a boost leak test sounds like you've got a massive air leak.is your biss screw set properly?