Lennart Sorth
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« on: May 24, 2008, 02:42:19 pm » |
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The exhaust on our 2002 2.2dci recent broke, half an inch behind the second catalytic converter (positionwise right under the gearlever). It might have been possible to weld and have it last a few months, but we opted to let the Renault garage replace BOTH cats (gulp!), as they come as a kit from Renault.
However, when the car was ready, it now has a distinctly more audiable "diesel" sound when engaging, but whats worse, it seems to be low on power when engaging.
As soon as the engine gets into the turbo-range, there doesn't seem to lack any power.
Idle has also become a tad irregular - sometimes the whole car shudders - not violently, but enough to worry me. We havenøt got a clear image weather it is worse when cold or hot - for the time being it simply seems to happen occationally.
Other times, it idles fine, so its some periodic error.
The "diesel" sound could be explained by the now clean piece of exhaust from the exhaust manifold and back towards the silencers. Both silencers (one piece) are still the same.
The lack of power at ver low revs is however a constant problem - cold and warm. I always used to have the impression one COULD make the wheel spin when setting off, but now that would require revving the engine quite a bit, which would kill the clutch.
Now - spinning the wheels aren't my biggest priority - its just to describe the lack of power :-)
I took the car to the garage, and they were as puzzled as me, - but we ran it through diags and found nothing except a probably old code for a heater-plug which was replaced a year ago. We deleted that code, and drive the car for some 10 miles, and the mechanic agreed that it would seem a bit low on power, and he even agreed to the diesel sound. The poor idle was sadly not very apparent while I was there, but it was enough for him to notice as well.
No errorcodes were stored after the test drive, and the only thing he could think of was injectors, but as this fault was 100% coinciding with them replacing the cats, it sounds unlikely (but of course not impossible). Also, it would be expected for a failing injector to be niticed by the computer.
I have now poured a can of injector cleaner in the tank, and we will see how things are when the it has gone through.
As far as I know, the cats have no oxygen sensors or any other feedback to the computer, so how fitting new cats can affect the running is strange.
The EGR valve could also be under suspicion , but firstly we're using the guru-advise (=Roy) to clean it regularly by running in 2'nd gear on the rev limiter once or twice per tankfull, secondly EGR problems tend to cause lack of power at high revs - where we seem to have all the expected power.
Has anyone experienced similar power problems after replacing exhaust parts ?
/Lennart
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