I'm Back! '90 GTUs

project86 · 01-12-2017, 10:42 AM

Slow going but i replaced plugs and wires last night. Seemed to help a bit but still no dice. AFM next? Coils?

djmtsu · 01-12-2017, 10:45 AM

Quote:

Originally Posted by project86

Slow going but i replaced plugs and wires last night. Seemed to help a bit but still no dice. AFM next? Coils?

We have some coils we can swap in. Also, unhook the AFM from the airbox and have someone push the cone in a little when you start the car. If that makes a drastic difference, we might have found a winner. I think you can also unplug it altogether, and if it idles, but doesn't rev, it's also bad.

Pete_89T2 · 01-12-2017, 10:56 AM

Quote:

Originally Posted by djmtsu

We have some coils we can swap in. Also, unhook the AFM from the airbox and have someone push the cone in a little when you start the car. If that makes a drastic difference, we might have found a winner. I think you can also unplug it altogether, and if it idles, but doesn't rev, it's also bad.

Great suggestion, but he doesn't even need to go that far. Just remove the airbox lid, remove panel filter (assuming still all stock airbox & filter). Then he can reach in with a finger & move the AFM cone.

You don't want to move it all that much - if you push it too far in, the car should go pig rich & stall if it's idling.

An S5 won't run with the AFM unplugged; not sure if it will even start that way.

***TitaniumTT*** · 01-12-2017, 11:23 AM

Quote:

Originally Posted by project86

So... I have the VDI open now. I thought that would help. Doesn't seem to have done anything for me. I just did a little looking around on the other forum and found out that the VDI doesn't have to be open all the time anyway.

The only other thing I found is that there is a vacuum nipple for the injectors that is supposed to help with atomization. I can't recall if I have that connected to a vac source or not though but im not sure that would cause my issues.

I'm truly at a loss now.

If that is left open, it'll cause a vac leak which could be the problem

Quote:

Originally Posted by project86

Slow going but i replaced plugs and wires last night. Seemed to help a bit but still no dice. AFM next? Coils?

Not to be the bearer of bad news but after seeing those plugs, it's time for a compression test.