Quote:
Originally Posted by 97 SL320
Take a look at throttle opening percentage / voltage at idle.
If the numbers are low, it points towards a vacuum leak post throttle body because the throttle is closing to maintain idle speed. A failing brake booster can cause a vacuum leak also.
If the throttle numbers are normal and MAF low, you have air entering between the MAF and throttle body ( maybe from the crank case breather through a oil cap / dipstick o ring ).
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Great tip, I didn't think of that.
I replaced the TB to Elbow rubber seal and reset the mixture adaption. So far 90 miles with out the code coming back on, all monitors are ready except for the cat and evap, I've tried to complete the drive cycle twice.
The old seal was starting to get hard and would crack a bit when you bend it.
Hopefully I'm good to go. Thanks for the help.