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[dopey]

Hi guys

New here and could do with some 2nd opinions if you have the time.

Approx 3 months ago I got the heater bypass valve changed.

Pretty much instantly the car developed a wicked miss-fire, sounded like a traction engine with a bunch of spanners lobbed in.

The miss-fire has remained but is inconsistent - it is generally there on start up but then usually clears after a few miles/mins.

Then the other day I was in the fast lane of the M1 and the engine just died.  Electrics and everything else fine, starter motor fine etc.

Long story short - it starts when its cooled down, but is now rougher than a rough thing.

Reading other posts it looks to be crank sensor, so I did pedal test which seems to concur.  However, it also kicked up a 560-system voltage and 230-fuel pump circuit error.

Just wanted to check if crank shaft sensor could have caused all of these issues or if maybe the ECU is playing up etc

Any advice would be V helpful

[tunnie]

HBV has nothing to do with engine firing. Assuming the garage did the work? Do you know if they messed around with the HT leads?

[pedroMV6]

HBV - near the dispack, innit?
Knocked a lead or the 12V cable?

[dopey]

They accessed the HBV by taking the top part of the engine off (plenum?)  the 4 leads out of the back of it were dotted up with numbers on the case and leads, so looks like they matched everything up.

Apologies for the lack of knowledge on the engine setup - fine on bikes but this V6 is a different kettle of fish.

[tunnie]

the fact this just started as soon as the HBV was changed suggests the garage messed up the order of the HT leads

[dopey]

If the ht leads were in the wrong order, would the car not be running rough all of the time rather than just initially?

[tunnie]

If the ht leads were in the wrong order, would the car not be running rough all of the time rather than just initially?

They might not have pushed it home all the way?

Crank sensor would cause the car to die on the motorway, then start later. Normally i would say crank, but the fact this started as soon as the HBV was changed makes me think the garage did something.

Do a pedal test to get the codes

[CaptainZok]

Think I'd be changing the crank sensor if it's showing up a fault code then see how it is.
The pedal test may be showing some old codes that have since cleared but are still stored in the ecu.

[dopey]

I got 335 - crank sensor, 560 - system voltage and 230 fuel pump.

So suggests crank sensor - but agree with you that timing of the problem seems a bit of a coincidence.  Plus not sure what the other codes mean in idiot-speak and whether they are related or not.

The nice AA chap ran the codes stored at the time and they were general misfire codes, so he cleared them out.  The 3 codes above have cropped up in following the last start up attempt after the codes were cleared.

[tunnie]

crank sensor is a code 19, double check those codes again....

But your right get the crank sensor changed, but i think there maybe other issues here as well.

[dopey]

Was using the codes taken from

http://www.omegaowners.com/forum/YaBB.pl?num=1220619694

Should I be using different codes?  Its a 2001 2.6 V6.

[CaptainZok]

Err just a point chaps, how many plug leads does a 2.6 have?

[dopey]

Thumbing through haynes manual as I type - dont think those 4 leads are actually the plug leads. 

As I say - apologies for lack of grasp of V6.  Trying to get up to speed with it, though Haynes don't make it easy!!

[tunnie]

Err just a point chaps, how many plug leads does a 2.6 have?

Good point 

[CaptainZok]

Err just a point chaps, how many plug leads does a 2.6 have?

Good point 

They tend to be a bit light on dis packs too.