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Vauxhall Corsa C 1.2 16v Z12XEP 2005 - Misfire detection P0300, P0301 & P0304 - Fixed #

Posted by Norman Shelmerdine on February 11, 2011, 4:57 pm

Year of Manufacture *: 2005
Engine Size and Code *: 1.2 16V Z12XEP

hello can anyone help me with this?
intermittent misfire logs codes p0300/p0301/p0304
tests and checks performed as follows......
primary coil signals scoped
secondary signals scoped and peaks @25kv
injectors scoped
induction system smoke pro tested
egr tested and closed @.94v on feedback sensor
o2 sensor closed loop
fuel pressure @4 bar
ecu software up to date
air mass no symptoms and changed
ignition coil and plugs changed
moved injectors 1&4 to cylinders 2&3
compressions 4@160psi
have seen no.4 cylinder misfire at idle with good injector scope pattern and good kv at spark plug,ecu will then turn off injector for cat protection logging misfire codes.switching ignition off and on will reinstate injector.
had new valves/guides and hydraulic lifters.
same fault & codes.
no hair left and not sleeping at night now!!
thanks norman.

Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION

Posted by Kevin Apps <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2589' width='330' height='300' border=0 style='border:none;'> on February 11, 2011, 7:21 pm, in reply to "CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
Kevin Apps

Norman
What is the software version number ?
Kev.

Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION

Posted by Norman Shelmerdine <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5325' width='330' height='300' border=0 style='border:none;'> on February 11, 2011, 7:47 pm, in reply to "Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
Norman Shelmerdine

Hi not sure of software version at moment but vauxhall dealer checked it out with tech 2 and told us it was the latest version
Thanks for your reply

Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION

Posted by John Ritchie <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2638' width='330' height='300' border=0 style='border:none;'> on February 11, 2011, 8:58 pm, in reply to "Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
John Ritchie

Hi Norman ,
If it was my job (so glad it isn't) i would go back to basics , check what is going on with the old vacuum guage to make sure you don't have a sticky valve , tappet jacking etc , check fuel flow , cylinder leakage etc. I assume engine performance is ok ?.
What make of coil pack did you fit ?

Hope this is of some use

Regards
John

Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION

Posted by Mark Carter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on February 11, 2011, 9:49 pm, in reply to "Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
Mark Carter

Hi, What are the fuel trims telling you ?

Regards Mark

Modern cars, Its all wizardry and witchcraft

Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION

Posted by Jon Morgan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3190' width='330' height='300' border=0 style='border:none;'> on February 11, 2011, 10:29 pm, in reply to "CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
Jonathan Morgan

Evening Norman,
When does this misfire? - is it totally sporadic or does it only occur when the engine is hot?
If it is only on a hot engine, is this the one with the ECU on the back of the engine & if so can you spray it with freeze your nuts off to see if the misfire abates.

Have you scoped the Cam & Crank sensors, are they installed correctly (as per Dannies Vectra) - with the correct gap etc...

ECU coil driver fault?

Jon

Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION

Posted by Jon Morgan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3190' width='330' height='300' border=0 style='border:none;'> on February 12, 2011, 6:57 pm, in reply to "Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
Jonathan Morgan

Just had a chat with an ex vauxhall chap.
check the plug gaps are spot on - he'd been down a similar route with one of these, only to find the plug gaps were out by 0.1mm, reset & cured.

Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION

Posted by Bryan Smith <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5330' width='330' height='300' border=0 style='border:none;'> on February 13, 2011, 1:33 pm, in reply to "CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
Bryan Smith

Hi Norman,
Have you got access to a pressure transducer? Checking exhaust and inlet as well as vacuum near to the fuel pressure regulator diaphragm may give you some clues. Come to think of it, I don't think you have mentioned an inlet vacuum test. Another thought is a low amps clamp on the fuel pump just to see if it has any hiccups.
Glad it's not my job. Best of luck with this one.
Regards, Bryan.

Fixed #

Posted by Norman Shelmerdine on February 14, 2011, 9:23 am, in reply to "Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
Message modified by board administrator February 14, 2011, 3:43 pm

thanks to everyone who replied!
had another look at this on Saturday, started from cold and it missed on cyl 4 with injector switching and good kv.
removed spark plugs to inspect in cylinders and found water droplets in cyl 4.
took fuel sample and found water in fuel,empty fuel tank/rail and refill with new filter.
12 mile road test and all is well.

thanks norman.

Fixed #

Posted by Norman Shelmerdine on February 14, 2011, 5:52 pm, in reply to "Re: CORSA C P0300/P0301/P0304 MISSFIRE DETECTION"
Message modified by board administrator February 17, 2011, 3:25 pm

thanks to everyone who replied!
had another look at this on Saturday, started from cold and it missed on cyl 4 with injector switching and good kv.
removed spark plugs to inspect in cylinders and found water droplets in cyl 4.
took fuel sample and found water in fuel,empty fuel tank/rail and refill with new fuel filter.The water appears to be coming in through the charcoal filter new one fitted.
12 mile road test and all is well.

thanks again norman.

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