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[MonzaGSE]

Hi. My 95 Opel omega mv6 developed a new problem today. Upon overtaking a car it just gave up. Didnt accelerate more and just held 5500 rpm without the autobox changing gear. After i lifted off the throttle,(it was flat to the floor), the box changed up and i could accelerate again. After that it ran normal at cruising speeds and box changes ok. But when i use kickdown it starts shaking and jerking violently through the entire drivetrain and engine refuses to rev. Engine light comes on. If i release the throttle the car runs ok again and engine light comes off after about 30 sec of normal cruising. Try kickdown again an hell breaks loose all over again:p used paper clip method and got 19, 136, 73. Crank sensor, unknown driver output error and mass air flow sensor voltage low. Car was idling badly so guess that may cause 19? 136 someone said is a malfunction in the ecu. But had that one on and off for years without issues. 73 ive not seen before. Could defective airflow sensor cause this? Crank sensor is about 1 year old.

[Broomies Mate]

Was it a genuine Opel/Vauxhall sensor?

Does seem 'rev-range' related. 

[MonzaGSE]

Yes. Genuine GM sensor from Opel dealer. Might add that when driving home tonight(45km) car didnt miss a beat. Even pushed it to provoke something but the v6 pulled smoothly across the range. Dont Get it:p

[05omegav6]

How does it drive with the MAF unplugged?

[MonzaGSE]

Havent tested. Will try next time problem occurs and see.

[05omegav6]

Havent tested. Will try next time problem occurs and see.

Unplug it and see if it reoccurs

[Andy H]

Havent tested. Will try next time problem occurs and see.

Unplug it and see if it reoccurs

If you unplug the MAF it will run in 'limp mode' with the reduced rev limit. Can't remember what that limit is  but I think it is less than 5500rpm so it won't really help to diagnose the root problem.

[MonzaGSE]

Uncertain on this one. Car behaved much better today. But on the way home it did occasionaly stumble abit around 5000rpm. Tried unplugging the maf but pretty close to home so really didnt get to test it alot. But couldnt get it to miss/stumble with the maf unplugged the short while i tried. Engine revved quite happily past 6000rpm with maf unplugged though. Although eml light was on obviously. Will test again tomorrow, but leaning towards new maf.

[tunnie]

Am I the only one thinking HT lead(s) breaking down 

[05omegav6]

Uncertain on this one. Car behaved much better today. But on the way home it did occasionaly stumble abit around 5000rpm. Tried unplugging the maf but pretty close to home so really didnt get to test it alot. But couldnt get it to miss/stumble with the maf unplugged the short while i tried. Engine revved quite happily past 6000rpm with maf unplugged though. Although eml light was on obviously. Will test again tomorrow, but leaning towards new maf.

If unplugging it made it go better... There's only one solution... New, either Bosch or GM...

[MonzaGSE]

Update: read codes again some days later and that time only one code came up. Maf sensor. Ordered a used Bosch sensor from germany which arrived yesterday. Turned out the old maf was an aftermarket part. Used Bosch sensor seems to have done the trick:) car ran perfect today and yesterday:) Nice to get a result!

[Andy B]

Update: read codes again some days later and that time only one code came up. Maf sensor. Ordered a used Bosch sensor from germany which arrived yesterday. Turned out the old maf was an aftermarket part. Used Bosch sensor seems to have done the trick:) car ran perfect today and yesterday:) Nice to get a result!

  An easy fix