Zafira Power Loss Problem
I have a Zafira B 120 1.9 CDTi (55 reg. Z19DT engine) and, between 2000 and 3000 rpm, I experience an intermittent swooshing sound accompanied by a loss of power. This happens in all gears, but is especially noticeable in 1st and 2nd, and only if I am gently accelerating through 2000 rpm. It swooshes about twice a second and the power loss matches the swooshes, so I get a kind of "kangaroo hop" type of power delivery. If I accelerate harder, it disappears. If I get to 3000 rpm, it disappears. Apart from that, it's a fabulous drive. Sometimes it doesn't "hop" between 2000 and 3000 rpm, and smoothly purrs on through. About half the time, it hops. It is also more noticeable once the engine has warmed up. It is also much more noticeable going uphill. It seems like someone is cutting the throttle despite my foot being on it! Could there be a problem with the throttle sensor just above the accelerator if there is no fault codes shown?
I took it to a VX dealership and their diagnostics couldn't fault it, despite experiencing the hopping themselves on a test drive. They charged me £46 for this half an hour test and then told me that a further couple of hours diagnosis would be required @ £194 inc. VAT to try to find the problem. They said it wasn't the EGR valve sticking as this wouldn't hop, just give a solid loss of power. They also said it wasn't the injector wiring loom (http://www.vectra-c.com/forum/showpo...7&postcount=17). I left them to their own ideas and bought a new wiring loom for the injectors and a new EGR valve. A mechanic fitted the new EGR for me and this has made no difference. I have checked the injector plugs for sings of corrosion or dirt/oil build-up and there is none.
Has anyone out there any idea what could be causing this intermittent problem with my lovely Zaffy?
I think the problem is to do with the Turbo wastegate operation / sensor.
I'm sure Hometune has fixed one with this problem.
Just to clarify - Is your engine a 8 or 16 valve ? the Z19DT should be 8v. unless you have a Z19DT*
Last edited by MrDanno; 27-09-09 at 22:02.
I'm pretty sure it's an 8 valve. The engine sticker cites "Z19DT" with no letters after it. I'll try to post a picture of the engine with the Ecotec cover taken off tomorrow when it's daylight again. These things can really rule your life - I'm completely diesel-engine-obsessed currently! The new ECU-ruled engines are really hard to learn about. There's just so much "balancing" going on in them. As regards my theory of throttle problems, could that give these symptoms? Thanks for your reply.
Here are the pictures I promised. They are 3 MB a piece, so they are on my site. Here are links to each one :-
1) Picture of engine from front of car after opening bonnet and removing Ecotec cover :-
2) Zoomed view of injector wiring loom. Which one is the 3rd injector? Is that from the left or right on this engine?
3) Engine sticker showing exact credentials. To the right of this label is a connector not conneted to anything. Is this something to worry about?
4) Tubes down the front right of the engine as I'm looking at it :-
5) Device sitting to the left of the EGR. What is it?
6) Device sitting beyond the EGR (towards the back of the engine as I'm looking at it). The blue clip is loose and needed pressing back in. Made no difference. What is this?
7) Disconnected plug of some sort on the left of the engine. What is this? Does it need connecting?
I think we need to know the actual live data of the EGR valve. I hear what Vauxhall have told you but remember that a few months ago, there were 1,200 on order across the UK. They have switched the part number a couple of times in their efforts to sort this valve out.
If you could get the live data on a scanner (doesn't have to be Vauxhall dealer) the value from the EGR valve would be very helpful. I think a diesel specialist is more likely to sort this than your dealer.
The swooshing sound could also point to a faulty wastegate solenoid, a sticky turbo, boost pressure sensor - faulty or dirty and blocked - or a split in one of the turbo pipes.
Injector 3 is the one marked no. 2 on the engine cover.
Hometune, I'm not sure I understand you correctly. Are you saying that brand new VX EGRs are also faulty? The new one is fitted but hasn't made a difference. I also dismantled the throttle pot above the accelerator pedal, and gave that a wipe or two, made sure the contact pins were erect and reassembled. Still no difference. I contacted VX and they have informed me that there is "nothing outstanding" on my car as regards ECU updates or injector loom rewiring. Is it worth doing the 3rd injector?
As Hometune said, There was some new EGR's with problems.
What area are you in?
I am in the Harrow Middlesex area. I sourced my new EGR from Northern Motors in North Watford.
Was it a genuine Vauxhall EGR or an after market one?
AFAIK, it is a genuine VX part, since Northern Motors are VX dealers, and it came from their parts department.
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