2004 Vauxhall Vivaro power/fueling
Year: 2004
Variant: 1.9cdti
Categories:
Electrics, ECU, Warnings & Lights
had a diagnostic at vauxhall which was egr valve,changed that and mass air fow sensor and power was improved,however from half to full throtle there is little if any response and it slows on motorway gradients whilst pouring out unburnt fuel [definately not oil] it does the same on the flat,its as if its not breathing properly [air cleaner is clean] and or turbo not functioning, wondered if it could be manifold pressure sensor,reluctant to rev after 3500rpm ?
Posted: Jan 10, 2013 (11 years ago)
Unusual set up on that turbo,default is the dump valve is open.
Have someone rev the engine while you look at the activation rod on the turbo,you ought to be able to see it move.
The sensor,solenoid and the pipe work all have faults but a quick cheat,for test purposes,is to run the vac pipe from the vac pump straight to the turbo capsule,this will give full closure of the dump valve so full turbo boost,like I said,TEST PURPOESE ONLY!,you run it like this and the engine will die!!
Of cours all this presumes there's actually vacuum from the pump,it wouldn't be the first diesel turbo I caome across that had no turbo boost because there was no vacuum from the pump,or a shot brake servo loosing all the vacuum.
or for that matter a blocked exhaust DPF.
Code reading at the dealer is not what I'd reccomend,you need someone who knows how to read,and understand live data.EGR failure WILL TRIGGER a false AFM fault code.try the book for your local bosch specialist.
Have someone rev the engine while you look at the activation rod on the turbo,you ought to be able to see it move.
The sensor,solenoid and the pipe work all have faults but a quick cheat,for test purposes,is to run the vac pipe from the vac pump straight to the turbo capsule,this will give full closure of the dump valve so full turbo boost,like I said,TEST PURPOESE ONLY!,you run it like this and the engine will die!!
Of cours all this presumes there's actually vacuum from the pump,it wouldn't be the first diesel turbo I caome across that had no turbo boost because there was no vacuum from the pump,or a shot brake servo loosing all the vacuum.
or for that matter a blocked exhaust DPF.
Code reading at the dealer is not what I'd reccomend,you need someone who knows how to read,and understand live data.EGR failure WILL TRIGGER a false AFM fault code.try the book for your local bosch specialist.
Posted Jan 10, 2013 (11 years ago)
Thanks 1/4 drive for your answer, could I get the same "cheat" test if I joined the two vac pipes together from the thrust sensor which to my thinking could proove the sensor faulty.
Posted Jan 24, 2013 (11 years ago)
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