‘74 1.8L L-Jetronic Cold Start Low Idle, Mystery solved! Options

[Van B]

Ok fellas, here’s the run down Aux Air Regulator (AAR) and Cold Start Valve (CSV)/injector both work fine. Many of you have also been keeping up with my high idle issue that we figured out.

But yet, when the car is cold, i.e. room temp, I don’t get the high idle I should on start-up. Instead she cranks a bit and then lumbers to life. Idle lopes around 700-800rpm and then smooths out as it warms.

In all other aspects of operation, the engine seems to be pretty happy.

Thoughts? Experience? (IMG:style_emoticons/default/confused24.gif)

-Van

See post #419 on page 14 for a synopsis of the outcome.

[wonkipop]

i also have just had one other thought for Van B.

i don't know why i did not think of it earlier.
probably because i never think of it.

the thermostat and cooling duct flaps for fast warm up.

i don't have them hooked up.
maybe he doesn't either?

you plain don't need that heath robinson contraption in australia.
everybody has always unhooked them on all VWs in australia since the year dot.
i know there are purists who say the opposite (but we don't live in antarctica here).
despite what the purists say they can jam in the close position.
its rare for a thermo to fail that way but its not unheard of or wasn't unheard of in the old days. if it does it will hold the flaps shut and.........

mine have been unhooked for 30 odd years.
but i have only been having the weaker start up since recommission and a little more weaker gradually more recently.

i think my AAV was always up to the job for the first 15 years back in aus in the 90s.
but now its weaker. now it can barely cope without those fast warm up flaps as well?

its a thought.

Van B will have to sniff around his thermo stat under the car and see if the flaps are all still connected to it and what state the thermo itself is in.
that might help him get his desired factory fast warm up he is after.

given the number of crappy chinese products around these days i'd be looking real hard at any thermo i bought to make sure it was the real deal and up to it.