High idle and service brake booster

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Aug 24, 2010 | 11:28 AM

#21

kbracing96

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From: Oakland, OR

That shouldn't cause any problems.

Aug 24, 2010 | 12:05 PM

#22

Truckshop

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From: Prairieville,La

When the idle is high pinch off the hose going to the booster to see if it goes back to normal idle speed. If it does then the pump is bad.

Aug 24, 2010 | 12:15 PM

#23

black04

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From: Phoenix, AZ

Quote:

Originally Posted by Truckshop

When the idle is high pinch off the hose going to the booster to see if it goes back to normal idle speed. If it does then the pump is bad.

I tried that already with no luck.

Aug 24, 2010 | 12:23 PM

#24

Revolutionary

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From: Las Vegas NV, Chicago Il

Quote:

Originally Posted by Truckshop

When the idle is high pinch off the hose going to the booster to see if it goes back to normal idle speed. If it does then the pump is bad.

I agree that's how we isolated the problem in the past

Aug 24, 2010 | 10:27 PM

#25

black04

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From: Phoenix, AZ

I pinched the hose and it still idled high.

We played around with the tune for almost 2 hours with efilive and got the idle down but it really seems like there is some kind of vacuum leak somewhere. Where? I dont know. But we got the idle down. Now it has a problem with the rpms hunting with the AC on in drive

It was doing the same thing when i had the whipple as well.

Aug 25, 2010 | 05:37 PM

#26

00Silv4.8

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From: Mesa AZ

my truck did this when I first had the 6.0/4L80 done. Once I had it to Nic I found out my O/S was fucked up and I had to find a file that started life at a 6.0/80e. I doubt thats your problem, but its just somethin I went through and thats how it was taken care of for me.