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Vauxhall Zafira 2.0 2004 GSI - Ignition timing request drop out - Fixed #

Posted by Craig Shiraz on November 3, 2012, 11:49 am

Year of Manufacture *: 2004
Engine Size and Code *: 2000cc z20let
( Optional ) Scanner Used: modis
( Optional) Fault Codes: none

Hi guys

Had a Zafira GSI in for some power testing yesturday and noticed that under part throttle, between 2-3krpm steady state, the ignition timing request from ECU was dropping out and causing hesitation and engine note change.

No fault codes present

Cam sensor changed, individually scoped at sensor and signal was correct and repeatable

Crank sensor scoped at sensor and waveform appeared correct

Knock sensor showing no activity on logger

MAF sensor unplugged - fault still present.

I still suspect a cam sensor/crank sensor or a sync issue, the car is due back in Wednesday and i will scope and overlay cam signal against crank signal at ECU, but im also looking for other suggestions?

Re: Vauxhall Zafira 2.0 2004 GSI - Ignition timing request drop out #

Posted by Mark Carter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on November 5, 2012, 7:47 am, in reply to "Vauxhall Zafira 2.0 2004 GSI - Ignition timing request drop out #"
Mark Carter

What's the history on the vehicle?

Mark

Modern cars, Its all wizardry and witchcraft

Re: Vauxhall Zafira 2.0 2004 GSI - Ignition timing request drop out #

Posted by Craig Shiraz <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3492' width='330' height='300' border=0 style='border:none;'> on November 5, 2012, 11:56 am, in reply to "Re: Vauxhall Zafira 2.0 2004 GSI - Ignition timing request drop out #"

Hi Mark

A bit of an unknown, 120,000 miles.

Customer informed us that he had it remapped at a reputable company originally, then for some reason 'his mate had a go'. Apparently the problem has been there for some time, but I take this with a pinch of salt.
Cam/Crank sensors both allegedly replaced ( we changed cam sensor ), but no sub harness on the cam.

Im just trying to rule out any other ECU inputs that will influence the ECU ignition request in this fashion, then rule out cam/crank at ECU before condemning ECU itself.

Any suggestions appreciated, car is due back in this week for further diagnostic.

Re: Vauxhall Zafira 2.0 2004 GSI - Ignition timing request drop out #

Posted by Mark Carter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on November 5, 2012, 3:40 pm, in reply to "Re: Vauxhall Zafira 2.0 2004 GSI - Ignition timing request drop out #"
Mark Carter

>>> Customer informed us that he had it remapped at a reputable company originally <<<

Has the company got the OE map saved and if so your first port of call may be to re-work as OE and move forward from there.

mark

Modern cars, Its all wizardry and witchcraft

Fixed #

Posted by Craig Shiraz on November 15, 2012, 11:41 pm, in reply to "Re: Vauxhall Zafira 2.0 2004 GSI - Ignition timing request drop out #"
Message modified by board administrator November 16, 2012, 3:15 pm

ECU replaced

Thanks for the help Mark

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