4.5 throttle linkage wear and general poor running
Discussion
I,m going through a similar problem at the moment and have changed just about every thing to get to the bottom of it. I have changed the coil packs, plugs, leads, lambdas and fuel filter.
Mine intermittently "flutters" at around 2.5 to 4k rpm dependant on how I drive it. Give it full beans and its fine, drive steady, then floor it and it flutters.
I've had the diagnostic software on it and the problem seems to high adaptives on bank 2. I tried to get the adaptive figure down by adjusting the throttle pot but that throws out the the idle speed, adjust the idle speed and it throws out the throttle pot.
Ive tried this loads of times and have tried to find a compromise between the two readings.
The fault still exists but not quite as prevalent, so its off to see Joolz for a make over!
Just for information the ECU disregards the lambda settings over 4k rpm, so if yours is better above this figure it points to a fuelling issue?
Mine intermittently "flutters" at around 2.5 to 4k rpm dependant on how I drive it. Give it full beans and its fine, drive steady, then floor it and it flutters.
I've had the diagnostic software on it and the problem seems to high adaptives on bank 2. I tried to get the adaptive figure down by adjusting the throttle pot but that throws out the the idle speed, adjust the idle speed and it throws out the throttle pot.
Ive tried this loads of times and have tried to find a compromise between the two readings.
The fault still exists but not quite as prevalent, so its off to see Joolz for a make over!
Just for information the ECU disregards the lambda settings over 4k rpm, so if yours is better above this figure it points to a fuelling issue?
My understanding is that the lambdas are ignored above 50% throttle too, and mine is fine at high revs and with wide throttle positions. It's just light to mid range as of today. Lambda 2 is stuck at the highest voltage with fault code logged. Drive it for a bit and the adaptives diverge until I get AFR2 fault as well.
One of the new lambdas fell apart from the box. The steel cap covering the element is tack welded on, or is supposed to be. It broke off one of the 2 new ones as I pulled the plastic protection cap off. The other one seemed fine but I'm wondering if that's fallen to bits in situ and the element is just burning away in the exhaust stream. Either way, the chassis brace and exhausts need to come off again.
One of the new lambdas fell apart from the box. The steel cap covering the element is tack welded on, or is supposed to be. It broke off one of the 2 new ones as I pulled the plastic protection cap off. The other one seemed fine but I'm wondering if that's fallen to bits in situ and the element is just burning away in the exhaust stream. Either way, the chassis brace and exhausts need to come off again.
Much to my shame I've neither fixed nor driven the Cerbera since my last post. I managed to lose last summer due to the car being worked on so rather than do it again I need to actually do something.
Since the last sensor porked itself after a month or two, I decided to buy a cheap universal fit sensor.
It's a 3 wire (black, white and red) NGK NTK Titania sensor and I found one on eBay for £17 plus a tenner postage from the USA. Much better than £90 for exactly the same thing but with a Rover plug attched at the other end of the wires.
Since the last sensor porked itself after a month or two, I decided to buy a cheap universal fit sensor.
It's a 3 wire (black, white and red) NGK NTK Titania sensor and I found one on eBay for £17 plus a tenner postage from the USA. Much better than £90 for exactly the same thing but with a Rover plug attched at the other end of the wires.
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