2005 v8 Fluctuating revs on idle and crusing

Hi all. Any advice on threads (I cannot find an exact match) or help. Just recently bought my 1st Land Rover. 2005 Vogue 4.4 petrol AJ V8. I am experiencing revs jumping up and down between 500 - 900 when in idle. When driving the problem persists. Noticeable especially in cruise control mode. I fitted a new MAF as I had it serviced last week and they said the MAF readings were not right. No change to symptoms. New battery fitted last month although it was a 019 (which my indie said should be an 022) I have read various threads on altenator/battery/MAF/Throttle body and more worryingly torque converter. Would the torque converter affect idle revs etc. I plan to clean the throttle body when I get a chance to see if that resolves anything. All help appreciated. Thanks

Big Fuz said:

Hi all. Any advice on threads (I cannot find an exact match) or help. Just recently bought my 1st Land Rover. 2005 Vogue 4.4 petrol AJ V8. I am experiencing revs jumping up and down between 500 - 900 when in idle. When driving the problem persists. Noticeable especially in cruise control mode. I fitted a new MAF as I had it serviced last week and they said the MAF readings were not right. No change to symptoms. New battery fitted last month although it was a 019 (which my indie said should be an 022) I have read various threads on altenator/battery/MAF/Throttle body and more worryingly torque converter. Would the torque converter affect idle revs etc. I plan to clean the throttle body when I get a chance to see if that resolves anything. All help appreciated. Thanks

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Was the new MAF a genuine part?

I'm not sure. Will have to check. I bought it from the indie but he told me it wasn't from Land Rover direct £60

Big Fuz said:

I'm not sure. Will have to check. I bought it from the indie but he told me it wasn't from Land Rover direct £60

Click to expand...

After market MAF's often do not work well.

Update - I finally got the time to have a go at removing the throttle body for cleaning, (after watching a few you tube videos). Unfortunately I did not have small enough socket set to be able to loosen the bottom 2 bolts on the body. I know they are all 8mm but other hoses etc in the way prevented my 1/2" drive accessories to get right in there. Rather than do nothing until I get the proper tools, I decided to clean what I could while the hose from the air filter was removed. I didn't think it was too bad until I started spraying the carb cleaner in. Unbelievable amount of dirt came out. Anyway after cleaning what I could, I reassembled it and started her up. Couldn't believe the idle fluctuation was totally gone. After a short drive to confirm, I did notice that in cruise control, the rev counter did fluctuate still. Not sure if it's the torque converted hunting for a gear or just not level enough road to cruise without need for gear change. I will update again if I find this changes.

Don't know these engines. But there will be an idle air control valve somewhere look at that.