Petrol Diagnostics

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Mazda 6 2.0 2007 Petrol - Part load surging between 2500 / 4000 rpm #

Posted by Damian Daize on November 22, 2011, 5:19 pm

Year of Manufacture *: 2007
Engine Size and Code *: 2.0 i LF
( Optional ) Scanner Used: Launch,Multiscan,Solus
( Optional) Fault Codes: None

Hi
Can anyone shed any light on this one or advise, Above vehicle has developed a fault where it surges sharply on light throttle.You can also get it but not as bad when revving it stationary. No trouble codes stored. Live data looks ok ,Still Tried another maf sensor. have tried resetting ecu by battery disconection to no avail , o2 sensor switching, cannot see any air leaks and basics look fine,If we lengthen the injector pulse width it runs fine instantly. Dealer has told us there are no known issues or software updates.
TIA

Re: Mazda 6 2.0 Petrol Part load surging between 2500/4000 rpm

Posted by Sean Mc Gettigan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5291' width='330' height='300' border=0 style='border:none;'> on November 23, 2011, 7:47 am, in reply to "Mazda 6 2.0 Petrol Part load surging between 2500/4000 rpm"
Sean McGettigan

Does this have EGR Damian?

Regards
Sean

Re: Mazda 6 2.0 Petrol Part load surging between 2500/4000 rpm

Posted by damian daize <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5217' width='330' height='300' border=0 style='border:none;'> on November 23, 2011, 8:05 am, in reply to "Re: Mazda 6 2.0 Petrol Part load surging between 2500/4000 rpm"

Hi Sean
Yes it does. If we manually operate it via scan tool it does seem to work .
The way it drives really surprised the EML not coming on?
Damian

Re: Mazda 6 2.0 Petrol Part load surging between 2500/4000 rpm

Posted by lee mackintosh <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1348' width='330' height='300' border=0 style='border:none;'> on November 23, 2011, 7:52 pm, in reply to "Re: Mazda 6 2.0 Petrol Part load surging between 2500/4000 rpm"
Lee Mackintosh

I had a mazda 6 in with very similar problems to yours, if i disconnected the Pre CAT 02 sensor then it would drive fine, this also had no fault codes logged.

This had a different sensor to normal (wideband i think its called) that works with switching a currnet and voltage feedback.

I attempted to scope the current output and signal voltage but as i don't have a micro amps clamp it wasn't that easy but did manage by looping the wire around my low amps clamp.

I came to the conclusion that the 02 sensor was lazy but at nearly £300 didn't want to take the risk so advised to take it to a dealer.

The outcome was a new 02 sensor and a MAF meter, i scoped the MAF as well whcih in my opinion worked very well.

Re: Mazda 6 2.0 Petrol Part load surging between 2500/4000 rpm

Posted by Sean Mc Gettigan <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT5291' width='330' height='300' border=0 style='border:none;'> on November 23, 2011, 8:38 pm, in reply to "Re: Mazda 6 2.0 Petrol Part load surging between 2500/4000 rpm"
Sean McGettigan

Monitor the EGR data when the fault is occurring Damian, see if there is a link.

Hth
Sean

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