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Old 2nd February 2017, 01:05 PM
Mechcanico Lee Mechcanico Lee is offline
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Join Date: Jul 2015
Location: St Helens Haydock
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Architex ........ he does say its lean running on both gas and petrol so maybe a more common fault here .??


Josepe

Some good diagnostic fault finding going on here .....you have covered most of the things i would of asked with this fault, even smoked it... very good


So to just confirm some things

At idle are short term and long term fuel trims near the 0 value ( after clearing code and doing reset )

The vcds block 93 being near 0 or 1 kw (degrees of rotation ) is that both banks of cylinders left and right at those values .

If you drive at a steady speed and watch the before cat lamdas on both banks is the lamda equivalence ratio going to a lean value on the faulting bank .... lamda 1 or higher 1.100 or above and so on , also look at the after cat lamdas is one of them going to a leaner reading ....good reading around 0.7 volts ....leaner will be below 0.7 ....at steady throttle the after cat lamdas should be pretty constant .
Very ofen after cat lamdas have some bearing on fuel trim calculations ...so if one bank has a bit of a bad cat it could affect fueling ( normally get codes for poor cats ...but never assume !!)


The inlet manifold .....these have the variable length tracs ...are all the linkages to each shut off flap working and connected to the operating arm , im thinking at the areas you are going lean one bank could be at one setting and the othe bank at another .

Before the car had all these timing chains repaced was this code for lean mixture present ?
Could you do put a vaccum guage on inlet manifold and look at the reading , ive found good engines pull around 20 inches of mercury or around 350 millibar.

If im correct on this engine the cam sensors are only on inlet cams so the exhuast cams could be off and you would not know this , it would perhaps make it run a bit rough at idle .....the vaccum test is good for showing cams being off .
A few things to have a look at .
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