How do you adjust idle on 1975 1.8L l-jetronic Options

[steveneashcraft]

Assuming that everything is right. Where is the idle adjustment on a 1975 Porsche 914 with a 1.8L engine with l-jetronic. Car is absolutely stock.

[messix]

i had this problem once and it was vacuum leaks on many hoses. replace them or trim them back a little of the hard crusty ends.

[double-a]

I recently performed some troubleshooting on my '75 1.8 and I thought I'd record my experience here for posterity! For months I've had to deal with dodgy idle, dying when rolling to a stop, random power surges at speed, and more. I replaced the AAR, which helped some, but didn't solve the problem.

The issues seemed completely random. Sometimes it would drop to idle perfectly, other times not. Sometimes there was plenty of power (for a 1.8), other times it was all over the place. Ran rich, with terrible gas mileage of course.

Timing was set correctly, vacuum lines were all checked and trimmed, then checked again. So what was it?

For my problem, the solution was ridiculously easy: a sticky AFM flap. Years of dirt, oil particles and other crap had accumulated on the smooth inner surfaces of the AFM, causing the flapper to stick at random times. An hour of my time and a cup of solvent was all it took to make the car fabulously fun to drive again.

So... like the others have said, check the most obvious stuff: timing, vacuum lines, etc., but also some that are less obvious.