P38A Engine twitch on idle 4.6 yr 2000

If you have a gas blow lamp, with the engine running introduce a bit of gas into the air inlet and if the figures react they are working. If not they pooped or just dirty.

Revititllclear said:

Outside air temp was 12c but Intake Air Temp was showing 25c when the ignition was just switched on (was this a default or failure) and on idle when fully warm (720 rpm) changed to 30c.

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Did you get to the bottom of this?

If they are lifting and dropping they are working at least

Revititllclear said:

From further t'internet reading is it correct that the IAT is a spurious reading as the MAF replaced the original set up?

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On the diesel, yes. Not sure that applies to the petrol.

MAF is another possibility.

kermit_rr said:

Did you get to the bottom of this?

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Not yet...I read somewhere that the IAT didn't apply to the later Thor with Bosch MAF.....but Grrrrr has said (post above) that was the diesels. I have read so much I'm getting overloaded with info. If the IAT does apply to the later petrol MAF then looks like my MAF may be on the way out. It is reading larger amounts of air volume....and possibly incorrect temps so I will give it another clean and possibly replace.