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[ffcgary1]

Had a call today from my dad today to say that his eml light with the spanner came on as he kicked down the autobox, car then went into imp mode and he pulled over asap. he read the codes and P01 was on his reader, but i suspect that it was infact P0100, MAF problem. i have read somewhere on here that 2.6 and 3.2V6's are prone to MAF issues, am i right to direct him in this direction, also he seems to get P0420 pre cat codes when he is running on LPG but only very seldom with petrol.
 
Any thoughts that i can pass on.
Gary.

[TheBoy]

Could be, but ideally need codes cleared, and an accurate idea of what comes back

[ffcgary1]

Hi jamie,
i have told him to clear the codes and try to re create the kick down issue to see if it returns.
Any thought as to the P0420 codes and LPG apperaring together.

[TheBoy]

0420 and LPG unrelated. 0420 (and 0430) are common on 3.2, solution to that is to move 2 sensors. These do not affect running

[ffcgary1]

Yep P0420 codes are just a royal pita,

[TheBoy]

When I say unrelated, that's not quite right. If the fuel isn't burning so well, it will throw the code if the precat is tired. Does the same with different grades of petrol. That's why he is seeing the difference between fuel types.  The result/cure remains the same though

[Entwood]

You run on LPG far more than on petrol (I hope !) therefore it "appears" that the 0420/0430 are caused by LPG, but they aren't....   

[ffcgary1]

Yes dad does run lpg 99.9% of the time so i guess that works out correct.

[chrisgixer]

While clearing the codes with the reader is handy, I'd suggest reading the codes via the pedal trick. Code readers can come up with different codes than what's actually there, or store current codes under pending codes or vice versa.
Pedal trick is more reliable in that regard for engine codes.

Maf, 3.2 is less reliable than the 3.0/2.5 but the 2.6 is the real culprit for Mafs. I certainly wouldn't say the 3.2 maf is unreliable enough to blindly replace it.

Given its on lpg, I'd check fuel trims as a first off. If the set up is out it will drag the fuel trims off and eventually miss fire. Although re starting the engine should cure that briefly. And running on petrol for a while will pull the trims back towards zero. Fuel trim malfunction will bring the light on, but if the light is already on or removed due to 0420/30 then you won't see it flash, then stay on for the fuel trim/missfire codes or whatever.

Pre cat, if driven sedately the light comes on more often. Pre cat temp is key, keep them hot. If its running rich due to lpg, that might support your theory. I guess.

[TheBoy]

Maf, 3.2 is less reliable than the 3.0/2.5 but the 2.6 is the real culprit for Mafs. I certainly wouldn't say the 3.2 maf is unreliable enough to blindly replace it.

Same MAF used in 2.6 and 3.2 I believe, so reliability will be similar. On these later MAFs, you need live data, anything else is a bit of a stab in the dark. I wouldn't replace a 2.6/3.2 MAF without proper diagnostics to prove it, unless I really was backed in a corner

[Kevin Wood]

Same MAF used in 2.6 and 3.2 I believe, so reliability will be similar. On these later MAFs, you need live data, anything else is a bit of a stab in the dark. I wouldn't replace a 2.6/3.2 MAF without proper diagnostics to prove it, unless I really was backed in a corner

Agreed, but there's something about the mapping on 2.6s that makes them very sensitive to a MAF that's started to degrade.. IMHO.

I've seen several 2.6s that have real running issues, and I've swapped the MAF into my 3.2 with no problems, but it's still turned out to be the MAF.

Anyway, as said, too early to tell with this one. Pedal trick would be a good step.

[ffcgary1]

Ok, heres the latest update
Dad came out first thing this morning and started the car from cold, car immediatly threw up the car and spanner light and gear selection was lumpy and in limp mode. Car was switched off and restarted and the light on the dash went out and the car drove beautifly without further issues. when he returned home he read the codes and the code reader indicated No stored fault codes ??. i think that this is leaning to a session on a tech2 to see the live data. 

[ffcgary1]

Update 2
Been down to have a look at it myself and read the codes via code reader and pedal trick,
Code reader shows no codes  but the car and spanner light is lit.
Pedal trick shows code P0170 FUEL TRIM MALFUNCTION BANK 1.
If i clear the code via the reader that says no codes the car spanner light goes out but comes back on 3 secs after the engine is restarted.
Is this a problem with the lambda sensor or something else.
HELP PLS.
Gary.

[chrisgixer]

Needs live data to check lambda activity, and somebody who knows what lambda activity should look like. So yes tech 2 with Kevin given your location.

So obviously something specific to bank 1. Injector issue or lambda most likely.