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2006 Vauxhall Vivaro Lack of Power/Acceleration

Posted By luke4755 Friday, November 04, 2016 9:15:01 AM
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luke4755
 Posted Friday, November 04, 2016 9:15:01 AM
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Hi guys, new to the forum! I'm always searching the net for info/advice and more often than not come across this site, so decided to join.Currently having a problem with a vauxhall vivaro van and was hoping to get a few opinions on it.

Vehicle: 2006 Vauxhall Vivaro, 1.9CDTI F9Q762 engine, 120k on the clock

Issue: Really lacking power/acceleration, worse when cold, improves slightly when up to temperature but still very gutless.
First thing i did was a diagnostic with a snap-on solus which came up with 2 fault codes:
1806 Airflow/EGR Sensor Circuit
1814 Exhaust Gas Recirculation Function
Tried disconnecting the MAF but the van would hardly run/idle. Symptoms tied up to being a MAF so i ordered a new OE quality one and fitted ...
Exactly the same, only the fault codes did not re-occur. From there i have tried the following:
Air filter change - dirty but not blocked
Fuel filter and diesel add. - dirty, no signs of any metal filings, primer gets hard after apporx 3 squeezes so no leaks.
EGR removed and clean, looks like it has been changed at some point fairly recently (pierberg unit), again was a bit sooted up but not excessive
All inlet, turbo and intercooler pipes checked, no signs of rubbing/holes. Pipes get hard when revved. Turbo spins freely by hand.
Waste gate vac pipe checked and blown through with compressed air, along with feed pipe on manifold.
Injector wires checked, cylinder 3 wires had half rubbed through, carried out repair.
Fuel injector leak off test carried out twice, once from cold and hot, idle for 3 minutes with the following results:
Cold
Cylinder 1 50ml
Cylinder 2 60ml
Cylinder 3 60ml
Cylinder 4 70ml
Hot
Cylinder 1 70ml
Cylinder 2 65ml
Cylinder 3 65ml
Cylinder 4 65ml

I have since spoken to two diesel "specialists", who have both said that the injectors are out of tolerances. 35ml over 3 minutes is the figure of a good injector so i'm told. The first guy wasn't too forward with info/advice just set take them out and he'll test them for me.
The second guy seemed convinced that yes they are out of tolerances, but they normally cause cutting out and starting issues and that they are unlikely to be causing my problem of lack of power/acceleration.
Through the process of elimination, knowing that injectors are a very common problem on these vans (it's even a known fix listed in autodata) and that the injectors are the only components showing a fault, i'm thinking this could well be the problem.
Would excessive leak off cause a lack of fuel, therefore power?
If anyone has any experience of this fault or has any info/suggestions i would really appreciate another opinion.

I'm going to have another check over this afternoon. Might try turning the EGR 180 as suggested on another post to block the exhaust gases and maybe check the exhaust, see if it's blocked.

Thanks in advance for any help.
Luke.







miketribe
 Posted Friday, November 04, 2016 9:34:33 AM
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Tried disconnecting the MAF but the van would hardly run/idle. Symptoms tied up to being a MAF so i ordered a new OE quality one and fitted ...
Exactly the same, only the fault codes did not re-occur.

We have lots of these in. I have replaced many OE quality MAF sensors from a couple of well Know CRAP sources, I am not saying that is your problem but, you need to test further. Try scoping the MAF sensor and comparing against a known good waveform pattern.

Does the engine struggle to rev from cold?

Mike


Being in business would be fine, if we didn't need customers.
luke4755
 Posted Friday, November 04, 2016 12:31:25 PM
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Hi Mike, thanks for the reply. I fitted a Beckerman unit from a trusted supplier, i'm not familiar with them to be honest but my supplier assured me it's OE.
But like you say doesn't mean a lot!

To be honest with you i don't have a scope at the moment (only recently started up on my own). I'll see if i can borrow one in the mean time.
I don't suppose you would know where to find a known good waveform pattern?

Yeah the engine is really slow to pick up when cold. When i went to it this afternoon it wouldn't actually rev for 5/10 seconds and then picked up.
This was after i had turned the EGR valve 180 as seen in another post. (Not sure if the two are related) but would rev, all be it very slowly after that.

Is it normal for the engine to run poorly/struggle to idle with the MAF disconnected? Most vehicles , i believe, go in to a default mode and you will recognize very quickly if the MAF is at fault?

Thanks again.
Luke.




columbo
 Posted Friday, November 04, 2016 2:25:18 PM
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its your injectors. get them out and tested.

if you have no pedal response at all for a few secs its a sign that one or more injectors is not fuelling the correct amount.

a bench test will show this.

good luck




oh and one more thing.............give it a wash.
luke4755
 Posted Friday, November 04, 2016 4:39:05 PM
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So i found another post with a very similar problem. On there a guy called Angus said that the MAF should have 5 volts feed at pin 3 and approx 2 volts idle 4 volts throttle blipped at pin 5 which i have on the newly fitted MAF.

Thanks for the reply columbo. Sounds like you're talking from experience with these particular vans?

The trouble is the van has lots of other issues such as brakes, tyres, steering joints etc i don't believe it's worth repairing.
If i do get the injectors tested i'll post back with the results but i think the customer isn't going to want to spend the money on the van.
I was told roughly £130 +vat per injector. Then there's labour cost, if they're not seized in, plus the other repairs needed ...

Thanks again for the response guys.
Luke.
laldog
 Posted Friday, November 04, 2016 7:05:39 PM
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Injectors are way out,chuck your aftermarket MAF away these need genuine only end of. Check your map sensor and pipes and stop pissing about with the egr valve they were not designed in that way.

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