bsowers206

Today I installed a new vacuum servo for the center diff. And when I went to start the car again, it was idling at 500ish rpm and when I tried to rev the engine up it shuttered and backfired through the throttle body. I checked my vacuum lines and distributor cap and they all seemed fine. I noticed that the idle air pump hose was collapsing when I got on the gas. I did the job at my friends house and had to drive it home. It didn't stall but it had absolutely NO power and the only way I could accelerate was to up shift. Has anyone had this problem ? hall sender? o2 sensor? idle stabilization valve?

Sorry for the long post, I'm very frustrated. Any help was be awesome!

Thanks

Tony Hoffman-4000Q

So, start by looking for a vacuum leak, then perhaps something you bumped or umplugged that might affect mixture.

Tony Hoffman

bsowers206

thanks tony, so i've got it figured out...so if you look at the fuse box, there are 6 fuses along the bottom edge, they are 23 through 28. 5 of those slots are open one of them is the cis-e power supply. i pulled it out and put it in my power mirror slot. thinking it was a spare fuse. long story short cis-e works better when it has power. i do think it's pretty silly that audi would put only one fuse in the middle of a bunch of open fuse slots. thanks for comments.

Brent

Tony Hoffman-4000Q

I've bought a 4000Q and the recent 80 cheap because of this. I was told the 80 needed a new Hall sender, diagnosed by a shop. It's amazing how much better it works with power, also!!

Glad you got it sorted out,
Tony Hoffman