Need a pic of the FIAV blocked off

[4g63tcrazy]

Good idea, I'll go do that in a little bit. I have a spare one with me too I could try. I did notice there is rtv around it from the guy before me so maybe he lost the little o-ring for it.

[Shane@DBPerformance]

If there is 1 good coil in each of those ISC motors you have, then you could build one good one, if that is the problem. It's common for 1 coil to go bad and then it don't work so good,

[4g63tcrazy]

Ok cool, I did try unplugging the isc while it was idle surging and nothing happened. Then I loosened up the idle switch and the idle went up to 2000. (Cause the ecu no longer knows the car is idling.) Then put it back on and it went back to surging from 1100 to like 1400. If the isc ohms out good I may try adjusting the biss screw, I might have it out too far.

[Halon]

Man I just started the car. The thing idled right away without any warming up. I think I'm going to like having the ISC back in.

Do you know the proper way to set your idle? If you don't, check out VFAQ or plymouthlaser.com. Also, I have an ISC here with 1 good coil if you need any parts. If you need help soldering in the new coil or anything, let me know. I also have a spare good Black ISC sitting here if you need one. It works fine, but is the loudest ISC I've ever heard.

Also, if you have a blown ISC, there is a chance it may have damaged the ISC chip/circuit in your ECU. Something to just keep in mind.

[4g63tcrazy]

Yeah just I got inside from testing it. They tested out at 30.1 ohms so they are good. I turned the biss screw all the way in and it still idle surges once it's warmed up. So I must have air getting in somewhere.. I'll post a pic of where a put the rtv so you guys can tell me if I put it in the right spot or not..

[Halon]

Did you set the idle the correct way? There are 2 points that you need to ground before adjusting the BISS screw.

[4g63tcrazy]

Ok.. after looking at the pic of which ones to block off I forgot to block off one passage..:punch:

I got it blocked off now but I'll probably just wait til tomorrow morning to let the rtv dry.

Brandon I haven't set the idle the correct way. The general rule is turn it in all the way and turn it out 2 1/4 - 2 1/2 turns and I've always gone by that and it seemed to work well on my last 3 dsm's.

It should be good to go tomorrow morning though! I'll post the results.

[4g63tcrazy]

Well I decided to start it up tonight. Wanted to die a little at startup like it should. Then as it warmed up it started to idle surge.... Fuck me. So I let it warm up. Shut it off started it back up, then it reved to like 2200rpm's and dropped down quickly and continue with the idle surge. I tried messing with the biss and it changed NOTHING. Idled the same no matter what. It's acting like there is a huge ass hole after the maf. So I might mess with it a little more but I wont really be doing anything worth while til I do a boost leak test.

[niterydr]

Do you have a boost leak? What is the base timing? It sounds like it could be lean at idle, that is why it cannot generate enough torque to develop a solid idle? (Idle consists of two things, airflow and torque management).

Which car is this?

[4g63tcrazy]

This is on my white one. 91 tsi, auto, stock. I can't do a boost leak test til I come back home to MN which is in 2 weeks. The car does run lean at idle. I'm pretty sure I need a new fuel filter cause at light loads (driving up a hill) I'll feel a big loss of power and the wide band goes to about 17.5 a/f. Or I was thinking it's the fpr. But that is a different problem. I can't really do anything til I boost leak test it otherwise I'll just be going in circles. And I don't know if base timing is set correctly but the car idled fine before, except it idle surged as it warmed up. But once it was warm it was absolutly perfect. Now that I blocked off the FIAV it does the opposite..