‘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]

Is the cylinder head temp sensor the one on top of the right bank next to the distributor? Aka single wire connector?

I did my one obligatory cold start this evening to see if fixing the connectors on the dual relay changed anything… it didn’t.

That said, when it’s warm it hums a long real nice and the decel valve is working like a champ.

[wonkipop]

Is the cylinder head temp sensor the one on top of the right bank next to the distributor? Aka single wire connector?

I did my one obligatory cold start this evening to see if fixing the connectors on the dual relay changed anything… it didn’t.

That said, when it’s warm it hums a long real nice and the decel valve is working like a champ.

the CHT is further back on the right bank, hidden under the rear most intake manifold pipe.

the circular one in the engine tin nextto the distributor is the oil pressure switch.
it goes straight into the engine block just near where the oil cooler is.

i'm sure you have spotted the thermo switch connection to the cold start valve.
the thermoswitch is tucked under the plenum near the front right hand intake runner.

the CHT is a tricky thing to get out.
i'll try and find the page in the manual and post it up for you.

and i'm trying to remember where i got my factory manuals from as a download.
it was 10 years ago but i have a vague memory it might have been from the wonderful 914/6 GT website a guy folks in the USA must know. i think it was there. i could try and go have a look again. it was some kind of 914 resources site i found.