Astra H unstable erratic idle

[pugbug]

Hi, i wonder if anyone could help me with this problem.

I have an astra h z14xep that will not idle stable, i have thus far changed the throttle body, coilpack, spark plugs, replaced the ecu for a known working one, checked the wiring all over, checked for vac leaks.

I've now ran out of ideas, the eml does not come on but if any throttle input does not stabilise.

I have both tech2 and opcom, the only value that i can see that sticks out is throttle position pwm, that fluctuates a lot, and calculated throttle position changes from 2-4-6% when there is no throttle input, but it clearly says idle on tech2.

I have attached some photos, if anyone can help with id really appreciate, thx

[autoden]

Unmetered air! What are fuel trims like? Try smoke machine. Sometimes its around swirl flap actuator. maybe......

[Stelaras26]

I dont know if its related,but,you should check compression too,if car has many kms/miles.
Also,try unplugging sensors,to see if idle is stabilising.

[Meat-Head]

Try stuffing air intake up

jobs like these I just stuff my willy in airflow meter, see if it stalls

ON TOPIC:-

oil cap, must must must seal, see if it sucks down when engine running

[Dunbar]

And if the oil cap does suck down when running?

[CBR_bl]

Chk fuel trims.

[radiosolutions]

Hi, i wonder if anyone could help me with this problem.

I have an astra h z14xep that will not idle stable, i have thus far changed the throttle body, coilpack, spark plugs, replaced the ecu for a known working one, checked the wiring all over, checked for vac leaks.

I've now ran out of ideas, the eml does not come on but if any throttle input does not stabilise.

I have both tech2 and opcom, the only value that i can see that sticks out is throttle position pwm, that fluctuates a lot, and calculated throttle position changes from 2-4-6% when there is no throttle input, but it clearly says idle on tech2.

I have attached some photos, if anyone can help with id really appreciate, thx

Disconnect throttle body start up the car. Cut it out and connect throttle body back up. Done a few of these and it cures it.