Engine stalls shortly before reaching operating temperature

Hello everyone,

"For the past few days, my engine has been turning off when I come to a stop, for example at a traffic light, and it won't start again."

After approximately 1.5 to 2 hours of cooling down, it can be started normally again. Once the engine reaches its operating temperature, the problem seems to disappear. However, when I'm driving and the temperature returns to its normal level, there's a brief hesitation or jerk, and then it runs normally as if nothing happened.

However, if I stop and then try to restart the engine after a while (about 30 minutes), it won't start either. It will only start again once it has completely cooled down.

"Yes, it sounds like when it turns off, it's as if someone is switching off the ignition, and inside the car, I can hear a few relays clicking."

I've read a lot of posts, but I mostly only come across information about diesel engines with this problem, or gasoline-powered Fabias with a different engine.

So far, I have done the following:

Throttle body removed and cleaned.

Spark plugs replaced.

Ignition coil replaced.

Air filter replaced (was due).

All relays were disassembled and checked for cold solder joints or contact defects.

Hall sensor for camshaft replaced.

Control unit replaced.

The switches on the clutch and brake pedals were tested, disassembled, and cleaned.

I hope I haven't forgotten anything after trying out all those things.


The error memory was also empty. Only after he was dead and I had tried to start the engine a few times did the error message "Crankshaft sensor G28 - no signal" appear.

Could the potentiometer in the throttle valve be causing this problem?

Maybe one of you has another idea?

Okay, and my details are still missing: 1.8L engine, 125 horsepower, engine code AGN, first registration date 10/98, manual transmission.

It might not be a diesel issue, but maybe someone here can still help me?

I'm so tired of taking the bus.

Best regards.
from Hamburg

Alf.

"If it's not starting, you might want to check the crankshaft position sensor. It could be faulty, or perhaps the temperature sensor is the problem."

...I suspect it's the Hall sensor (the KLIMP diagnostic tool isn't showing anything)...it was the same with my old Escort...it would intermittently stop working, then more frequently...until it completely failed...I replaced the Hall sensor in the distributor...and it started right up...

...guess how many problems Opel is having with its camshaft sensors...

Greetings, Styrian.

I had a similar problem with an Audi A8 4.2.
The engine would always stall after the electric fan had been running for a while; it seemed to be disabling the electronics somehow.

Best regards,
wob-in

...which I had forgotten to mention: I've already checked all the ground connections for corrosion/damage... if the relays you described are "chattering"...

Is the onboard voltage okay???

Does the starter motor spin normally or slower in the event of a fault?

Greetings, Styrian.

Hello, I had the same problem with a Ford Focus. In that case, it was the camshaft position sensor. But you said you already replaced it. What worries me is the relays. We need to figure out whether the relays fail first and then the motor shuts off, or whether the motor shuts off first and then the relays fail.
Also, try testing the dual-temperature sensor using a VAG-*** diagnostic tool. It might be malfunctioning. Alternatively, simply disconnect the connector; the engine should then run and not stall (for testing purposes only!).

Thank you for your tips.

The car is running again. It was the crankshaft position sensor. It failed to engage when the engine was warm.

Best regards from Hamburg.

Alf Stingray.