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[jtypecav]

Right.

Today got cruise stalk and switch installed. Went to dealer and paid £30 to have the ECU told it's a manual again (remember that "faulty" ecu fixed by installing auto ECU last year?).

Cruise worked flawlessly on the way home. Until I revved to 4K, at which point the EML lit and the car killed two random cylinders (across both coil packs usually..)

This horrified me, as it was return of the problem that couldn't be identified last year. Basically, the car when correctly identified as a manual drives fine until 4K under load. In first gear, or de-clutched it will rev right round, smooth as anything.

If you rev to 4k you loose 2cyls, if you can struggle to 4k again you loose another two!!

But when designated as an auto (which we did by accident when I swapped the original out for an auto last summer - leading me to believe it was a faulty ECU!), the problem comes back again!

It's had crank sensor (difficult to get to one), and new coil packs recently.

I have to drive it 3K miles in less than a week, so have had to put it back to auto, now with the spanner lit up as it's looking for an autobox it doesn't have (but is driving fine!).

The dealer said it could be a software glitch and to check if there was an SBS for the car or similar and said they hadn't seen anything like this before and they are normally bullet proof!!

Help!

[biggriffin]

Me thinks you need to chat to fuse 18, 2woody or serek. They the auto to manwell experts. Check all the earths, believe there's one wire you have to earth out from auto to manwell conversion.

[jtypecav]

Thanks for the quick reply. However, the car was manual from factory, and unless I can get the spanner off I can't use cruise, it's not a conversion. Just something we fixed with an ECU that happened to be an auto. Turns out to be key to the issue!

What does a manual take account of that an auto doesn't?

[Kevin Wood]

Clutch switch?

Did you read the codes when it was playing up?

[jtypecav]

Was doing it before clutch switch was fitted back when I bought the car.

Read codes, no codes listed(!) Gives generic / multiple random misfire.

Can't diagnose again now as went back and had it set from manual to auto again.
No cruise now either (which worked flawlessly till I hit 4k revs!)

[TheBoy]

I watch with interest, shame you're not closer, as I'd love to get my teeth stuck into one like this.

[TheBoy]

Ah shit, except I don't have a Tech2 anymore 

[jtypecav]

Right now, I'll take time off work and drive anywhere that can sort it!!

[jtypecav]

What about ABS?

Are the tractions profiles different for auto / vs. manual?

[TheBoy]

What about ABS?

Are the tractions profiles different for auto / vs. manual?

Doubt it. ABS will attempt brake first, then simply ask engine to reduce power.s

[jtypecav]

The thing is, I can't even diagnose it as I've had to get it switched back to auto, so it doesn't kill cylinders off. So basically I'll have to pay vauxhall to make it not run properly again when I'm back from Europe. But *REALLY* wanted to be able to rest my right foot after 18 hours... 

[AndyStobbs]

Struggling to make sense of the original post. When you say the problem comes back when designated as an auto - should that not be it goes away when designated as an auto?
Also you say you've had crank sensor replaced - the difficult to get to one, there is only one crank sensor but the way I've interpreted the post its as if there are multiple crank sensors.

Has this problem always existed during you ownership?
Auto's have a kick down feature which manuals don't. I've no experience of coding from auto to manual (yet) so don't know how much relavance there is in the kickdown but on A DBW system the Engine ECU must send the signal to the Gbox ECU to kick down

[TheBoy]

What is the ABS programmed for (auto/manual)

[jtypecav]

Sorry for any confusion.. on laptop now not phone..

The problem goes away when erroneously told it's an auto - the spanner comes on, and it drives beautifully.

When it's told it's a manual, which it's always been since factory, it behaves like described, killing injectors (I guess) at 4k. Yup, it's always behaved like this, I'll find the original thread.

I changed the crank sensor down the back when first trying to get to bottom of this. Any more q's I'll reply to asap!

[jtypecav]

What is the ABS programmed for (auto/manual)

I only swapped out the ecu completely with ring and chips, didn't change anything else when it resolved the problem (but lit the spanner) originally.

So guessing manual still, but car drives fine with wrong ecu. Only starts playing up when told what it really is! (The master tech tried FULL conversion and partial designation - not sure what this meant, but only full designation back to auto got rid of the gremlins again..)