‘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.

[Van B]

Well, now that I have four plugs that fit, the car definitely runs better. I’m still so pissed that a guy who sells himself on being a classic Porsche specialist could miss something so damn basic.

I also replaced the temp II sensor. No change on cold start, but it was pretty warm here today so I didn’t expect the computer to go into cold start mode based on readings from the temp switch anyway.
It does make me think about finding a temp switch that has a much higher temp window. I think modern knowledge of engine wear has taught us that getting the oil pressure up as quickly as you can provides a huge benefit to engine longevity. The reasoning of the 914 era was to overcome cold engine/oil friction so the car would stay running. Thus, it makes sense they would choose a 15C/55F temp switch.

[emerygt350]

getting the oil pressure up as quickly as you can provides a huge benefit to engine longevity. The reasoning of the 914 era was to overcome cold engine/oil friction so the car would stay running. Thus, it makes sense they would choose a 15C/55F temp switch.

Oil pressure while cold should peg to 60 at idle almost immediately.

You are still having low cold idle? Did you pull the aar hose off the plenum yet while it is running low and cold?