Thread: Huntings revs after TB work...suspect Y pipe connection?
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Old Aug 31, 2015 | 08:09 PM
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onehundred80
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Default Re: Huntings revs after TB work...suspect Y pipe connection?
Originally Posted by minimayhem
Hey all,

Did some work yesterday to fit the C320 engine cover with fiters, 3'' MAF and 74MM TB.

Connected all up and went for a drive. Noticed the revs started to rise to 2K when in neutral (manual trans) but moving. As soon as the car is not moving the revs drop to idle.

Plugged in the ECU reader and it shows the throttle position is rising from .8 to 3 then back down to .8, causing the revs to go up and down.

A quick question - the double pipe connector at the end of the throttle body, should they both be plugged in for an NA? One of mine looks rusty to the point where it looks like no tube has ever gone on it. I'm wondering if thats somehow causing the problem.

I dont think its a vacuum leak, certainly couldnt see anything - but if that pipe isnt the problem then I'm not sure...
Not to ask the obvious but how many hoses were on the old TB?
If you say two then you have your answer.
If you only have one on the TB that is a vacuum leak of the highest magnitude.
 
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