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Vauxhall Vivaro 1.9 CDTi F9Q 760 2006 - Poor performance - Ongoing #

Posted by Andy Fowkes on December 9, 2012, 7:42 pm

Year of Manufacture *: 2006
Engine Size and Code *: F9Q 760

110,000 miles

Hi ya guys,
Van suffers poor performance below 2500rpm.
It does carry a lot of weight. Owner is a plumber, it's LWB and it's loaded to the hilt....This is fact is playing on my mind. Once it gets going, it goes ok though!

No codes.
Compressions fine (quickie Pico relative test).
All intake hoses and pipes good. They've been off, cleaned and smoked independently.
EGR all good and working fine. Surprising how little carbon build up there was....

System is Bosch CP3.
Idle to WOT (see below) is 1.5 secs. I thought this to be sluggish. Anyone care to comment on that?
1st image is MAF vs Rail pressure.
2nd is rail pressure on its own.

Thanks very much for any input,
Andy

Re: Vauxhall Vivaro 1.9 CDTi - poor performance

Posted by Mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on December 9, 2012, 8:04 pm, in reply to "Vauxhall Vivaro 1.9 CDTi - poor performance"
Mark Carter

What's live data telling you?

Actual over desired

AMM readings?

EGR issues?

Mark

Modern cars, Its all wizardry and witchcraft

Re: Vauxhall Vivaro 1.9 CDTi - poor performance

Posted by Andy Fowkes <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3340' width='330' height='300' border=0 style='border:none;'> on December 9, 2012, 8:53 pm, in reply to "Re: Vauxhall Vivaro 1.9 CDTi - poor performance"
Andrew Fowkes

The live data is in the images Mark.
Granted, I've cut the Volts scale off!
Idle rail pressure is 1.3V or 300 bar
WOT rail pressure is 4.3V
AMM is operating between 2V and 4.4V.
These are good readings.
It's that 1.5 secs it's taking to attain those WOT readings - I want to know if that's sluggish or normal.
~cheers!

Re: Vauxhall Vivaro 1.9 CDTi - poor performance

Posted by James Eardley <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3143' width='330' height='300' border=0 style='border:none;'> on December 9, 2012, 10:27 pm, in reply to "Re: Vauxhall Vivaro 1.9 CDTi - poor performance"

Hi Andy

Actual over desired readings give you an insite into how the ecu is coping to achieve the target fuel pressure and if the target pressure/airflow is lagging behind the desired targets.

Without a known good fuel system profile actual and desired will possibly be more accurate, also you can watch this easier on the road under different loads.

I personally think that 1.5sec is a little sluggish but not alarming.

How long does it take for the target fuel pressure to be met from crank to start?

Maybe somebody has got a fuel system profile for this vehicle.

you could put a request in for one on the Autoscope section

EGR/Blocked airway has an effect on the rise time of your profiles, even if it is only leaking/blocked very,very slightly.

James

Re: Vauxhall Vivaro 1.9 CDTi - poor performance

Posted by Darren Cotton <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1876' width='330' height='300' border=0 style='border:none;'> on December 10, 2012, 6:41 am, in reply to "Re: Vauxhall Vivaro 1.9 CDTi - poor performance"

Andy I had a primastar in a while ago with a lack of power, first the EGR was stuck open, so thought great quick fix, the van was just as bad lucky to get to 40 mph, no codes stored. After a lot of messing around I replaced MAF and it was about 90% better I was not totally happy with it, but i scoped the MAF and FRP on a snapped throttle. Pic below is with a new MAF and EGR the response time on mine was 1.7sec i questioned this myself, but from my experience its a good response time...

Have you made sure the MAP sensor is reading correct and these do suffer with turbo issues...

Known good MAF v FRP

Darren

Re: Vauxhall Vivaro 1.9 CDTi - poor performance

Posted by Andy Fowkes <iframe src='https://members.boardhost.com/ukautotalk8/info/user=ukat3340' width='330' height='300' border=0 style='border:none;'> on December 10, 2012, 7:59 am, in reply to "Re: Vauxhall Vivaro 1.9 CDTi - poor performance"
Andrew Fowkes

Thanks so much for your input guys - tip top.
Thanks for the MAF vs FRP.
Some food for thought here....
Fella got the van back now. Will take another look in Jan.
We can 'see' live data, but not desired values.
Gonna recheck EGR and turbo - I do think the MAF proves these are ok though.
Cool, cool. Will update as and when we get a result and / or take all the weight out and do a 0 - 60 test!
Good week guys,
Andy

Ongoing #

Posted by Andy Fowkes on January 27, 2013, 11:40 pm, in reply to "Vauxhall Vivaro 1.9 CDTi F9Q 760 2006 - Poor performance #"
Message modified by board administrator January 28, 2013, 4:23 pm

ON-GOING - Repairs still on-going / awaiting parts or authorisation

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