Check your 'full throttle enrichment switch'. If failed, it sends a
signal to the ECU for full rich.

Jim Arnott
WetWesties
Union, OR

VW Addict aka The Bus Nut wrote:
>
> Hello All,
>   Last week I asked about an emision problem I have, but now I have a worse
> problem. I will do my best to discribe my problem and what I have done so far.
> The van is an 85 with the stock 1.9L gas waterboxer, trans is auto, miles are
> 175K.
> What is happening is that it runs very rough off and on at idle. It continues
> as you try to accelerate. Sometimes it will smooth out and run great, other
> times you will fight it for several miles. It feels like I am loosing a
> cylinder. It smells rich and vibrates like a dead cylinder, but then it will
> smooth out and run great again. The problem is most common when its warm(engine
> temp). The temp gauge rises normally and never goes past the middle. I replaced
> the cap and rotor with good brass ones and installed a new air filter(old was
> real bad). I pulled and checked the plug wires with an DVOM and all were good,
> plugs all looked good. I tried unpluging the O2 sensor and it did not change.
> No lights are coming on on the dash, all looks normal. I have sprayed the
> engine vacuum lines with WD40 and found no leaks. This has happened with 3
> different tanks of gas from 2 states and 3 stations. First 2 tanks were burned
> to almost empty. It feels like a miss, but I have found no ignition defects.
> Were should I start looking? I am stumped. I do have a small exhaust leak, but
> it ran great before with an even bigger leak(I welded 99% of the leak closed).
> Please help. I do not have a Bentley for the van yet, I will be getting one
> soon, but am on limited funds right now. I am in Tacoma Wa if anyone has one to
> loan.
>