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[malcy_p]

Evening guys/gals

My 3.0l manual estate has developed a fault this afternoon/evening. Drove to work fine this morning, then this afternoon drove out of the hospital car park and nearly stalled pulling away, shortly followed by the TC light coming on and the rev counter playing silly buggers jumping up and down with no relation to engine speed. Pulled over, stopped the engine, started her again  and she was fine until the next roundabout where the same thing happened... 

This time I didn't stop and the 20 mile drive home was fine. Had a look on the forum at home and decided to change the crank sensor - having had several Omegas I have learned to keep a spare in the garage...! 

All done I headed out to see the g/f and a mile from home the same thing happened. Boo.

Now, it *seems* like when the misfire is happening, the rev counter only reads true when the throttle is more than half open, backing off again causes the misfire and weird rev counter thing.

A bit of history - last Wednesday I swapped the ABS/TC ECU for a unit sourced via the forum, but I'm tending to think that is not the problem as I must have done nearly 200 miles since then with if working fine... and I don't think the ABS/TC would affect the rev counter, but I might be wrong.

I've not read the codes yet, but has anyone got any bright ideas? 

Thanks,

/malc.

[malcy_p]

Oh, should say she's a FL 2001 ex plod beast with 150,000 under her belt - no spring chicken but (usually) a reliable old girl.

/m.

[dbug]

Evening guys/gals

My 3.0l manual estate has developed a fault this afternoon/evening. Drove to work fine this morning, then this afternoon drove out of the hospital car park and nearly stalled pulling away, shortly followed by the TC light coming on and the rev counter playing silly buggers jumping up and down with no relation to engine speed. Pulled over, stopped the engine, started her again  and she was fine until the next roundabout where the same thing happened... 

This time I didn't stop and the 20 mile drive home was fine. Had a look on the forum at home and decided to change the crank sensor - having had several Omegas I have learned to keep a spare in the garage...! 

All done I headed out to see the g/f and a mile from home the same thing happened. Boo.

Now, it *seems* like when the misfire is happening, the rev counter only reads true when the throttle is more than half open, backing off again causes the misfire and weird rev counter thing.

A bit of history - last Wednesday I swapped the ABS/TC ECU for a unit sourced via the forum, but I'm tending to think that is not the problem as I must have done nearly 200 miles since then with if working fine... and I don't think the ABS/TC would affect the rev counter, but I might be wrong.

I've not read the codes yet, but has anyone got any bright ideas? 

Thanks,

/malc.

Agreed

[malcy_p]

Could it be the DIS module? I've had her for 5 years and not changed the DIS pack in that time which thinking about it is a good run for one of these...

Meh - I hate cars when they play up... 

/m.

[RobG]

Read the codes, although you`ve changed the crank sensor symptoms still point to it

[Johnny English]

First of all check the stored fault codes as IRW without correct rpm signal engine doesn't run at all. I would suggest you reading of live data at a proper garage...

[malcy_p]

Al-righty!

It's a bit late, but I've just got home. Misfire is still the same... mostly ok but worst at low rpm on a light throttle.

Anyhoo - codes without the engine running:
12 - 12 -12 - 19 - 19 - 19 - 12 - 12 - 12 - 19 - 19  - 19 - 12.... which is an Incorrect RPM Signal, but not the 31 No RPM Signal. Hmmmm.

If a picture paints a thousand words, how many does a video paint? Well, here an example of my rev counter oddness. The first two times the engine stops it is because it died. After that it ran on and off throttle until I switched it off at the end.

Watch in awe and possible boredom here --> http://youtu.be/quz54rqVmvg

Night night - let me know what you think?

/malc.

[albitz]

Code 19 - crank sensor. New genuine sensor required imo.

[malcy_p]

Roger that... The one I used yesterday had been sat in the garage since 2009. 

/malc.

[malcy_p]

Ok guys, bad news again.

Called Vx this morning and ordered a proper genuine Bosch CAS. Picked it up this afternoon and fitted it when I got home...

Took her for a test drive. She starting fine, idled nicely for a few minutes whilst I locked up the house and garage, then 500 yards up the road the TC light came on, shortly followed by the misfire and the rev counter started jumping again.    

What next? DIS pack? Faulty earthing? Engine ECU? 

Any thoughts gratefully accepted.

/malc.

[Johnny English]

First of all check the stored fault codes as IRW without correct rpm signal engine doesn't run at all. I would suggest you reading of live data at a proper garage...

Live data reading may help you. 

[malcy_p]

First of all check the stored fault codes as IRW without correct rpm signal engine doesn't run at all. I would suggest you reading of live data at a proper garage...

Live data reading may help you. 

I guess that is a trip to Vauxhall then? From memory that's never a cheap day out... 

[Andy H]

Ok guys, bad news again.

Called Vx this morning and ordered a proper genuine Bosch CAS. Picked it up this afternoon and fitted it when I got home...

Took her for a test drive. She starting fine, idled nicely for a few minutes whilst I locked up the house and garage, then 500 yards up the road the TC light came on, shortly followed by the misfire and the rev counter started jumping again.    

What next? DIS pack? Faulty earthing? Engine ECU? 

Any thoughts gratefully accepted.

/malc.

My guess is that you disturbed something electrical while wrestling with the ABS ECU, possibly something connected to the battery or fuse carrier?

I seem to remember someone forgetting to tighten the locking ring on the big circular connecter and having odd intermittent problems after they replaced their ABS.

[Johnny English]

Life is expensive mate...

I guess that is a trip to Vauxhall then? From memory that's never a cheap day out... 

What next? DIS pack? Faulty earthing? Engine ECU? 

The phenomenon is starting all the time by TC light on, isn't it? Why? Get it checked !

[malcy_p]

My guess is that you disturbed something electrical while wrestling with the ABS ECU, possibly something connected to the battery or fuse carrier?

I seem to remember someone forgetting to tighten the locking ring on the big circular connecter and having odd intermittent problems after they replaced their ABS.

I have thought of that... This evening when changing the CAS (it's had three in two days!) I rechecked the ECU and circular pluggy thing and they seem OK. There was 6 days between changing the ABS ECU and the problem raising it's ugly head.

Would a faulty DIS module that's potentially internally shorting out cause these symptoms? I'm thinking that the DIS must be linked to the CAS/rev counter circuitary somehow deep in the bowels for the wiring loom...? If the DIS was playing up could that cause problems? For £40.00ish I'm tempted to try it..... 

/m.