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[Omega6pot]

Hi, my "My Naff Code Reader" is bringing up a code about fuel trim malfunction on bank one and i was wondering what excatly controls this so i can change it. Any help would be grealty appreciated
B.t.W its a 2002 3.2 v6
AL

[andyc]

Air Mass Meter. We had a 2.6 in here a while back with Fuel Trim code and it turn out to be the Air Mass Meter.

But i'd siggest getting a second option before parting with your cash

Andy

[feeutfo]

interesting, my thinking, lambda related? if on one bank? if maf related would think both banks would throw a code? but i dont know enough on the issue to say for certain. See what others say... :-/

[Welung666]

What was the code the "My Naff Code Reader" gave you?

[andyc]

yeah the one wehad in was reading for both banks. We can't take any credit for it either as someone on here pointed us in then right direction

Cheers
Andy

[Omega6pot]

Hi, il have to put the "My Naff Code Reader" bacl on and post up the codes, it did have a 02 bank one sensor one error code aswell, i have replaced all four o2 sensors but still same code. the car is getting a replacement auto box in the next week so will see what symptoms i am left with after i get that in. Its idling fine when stone cold but as it heats up tghe idle speed moves up and down a little and it is rerally hard on fuel,
Cheers AL

[Kevin Wood]

If you can watch the live data it would be worth checking what the fuel trims are doing (you should see a short and long term fuel trim for each bank).

Also - have a look at the mass air flow reading (reported as rate of air flow in kg/h). Check this at idle when fully warmed up and at, say 2500 RPM fast idle.

Check the coolant temperature reading in the live data is plausible too.

If the fuel trim is out on one bank it suggests it's not the MAF because that is common to both banks. It may well be that the other bank is on the verge of hitting the limit, though.

Air leaks into the induction and exhaust systems are another easy problem that needs to be eliminated before suspecting a component failure.

Kevin