Fuel Pump Problem? HELP! 91 Jetta

2ndly, mark where the idle screw is at. Now slowly turn it counterclockwise or clockwise but keep notes how many turns you make. What I found on my 89 with Digifant is the idle screw was completely in and the idle was just like yours. I started backing it out and after the 3rd complete turn the idle smoothed right out.....may work for you!

I'm betting you've got a 1.8l with Digifont, unless they did something funky with Canadian models that year?

If I'm wrong then please excuse (and ignore) this post.

It sounds like electronic gremlins. The process used to be called "setting to spec" by the dealers, and the starting price (with no parts, which never happened) was around $240. Some of the other guys here had quite long lists of proceedures for doing this. The process included a digital multitester, a CO sensor and a virgin willing to be sacrificed.

There is a "idler stabilizer" device on that car, if it's the one that I'm thinking of. It kinda looks like a silver marital aid, sitting on top of your valve cover, buzzing like a, well, cheap marital aid. Mine has lasted

Short of that, I'd do the basics -- make sure that all electrical connectors are clean, including grounds and the connections to the ECU. Make sure you've got good spark plugs, wires and rotor (squirt some water on the wires with a spray bottle and see what happens).

Anyone wanna post their "set to specs" docs?

Tim Wohlford

Before monkeying with screws, get a can of spray carb cleaner and clean the throttle body. You'll need a old tooth brush. Just remove the rubber boot and look inside at the crud. Get it good and clean. The engine will be hard to start the first time. If that doesn't help, then remove the idel screw count tuns from fully seated, and use the carb cleaner in there too. I've even used it on the "buzzer" ontop of the valve cover followed with somethinglike wd-40.

JoBo