Idle problems

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Jan 22, 2006 | 03:29 PM

turbotimws6

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From: Hollywood

Idle problems

about one year ago I had a nitrous back fire. (before I installed Msd.)

Since that time I have had a higher idle(about 1200) I have changed the TB gasket, replaced Iac motor and O-ring. i have checked all my vacum hoses. I am unsure what else might be leaking... I need a little help

Jan 22, 2006 | 07:10 PM

transam5.7lt1

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From: Texas

Is the throttle body spring moving as it should? Check your PCV valves, I had a similar situation, but it resulted on one of the pcv valves staying open... Don't know how it stayed open, I replaced the one in the intake and it solved problem.

Jan 22, 2006 | 07:33 PM

turbotimws6

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From: Hollywood

Also when I'm coming to a stop(not a panic stop) but semi hard stop the idle shoots to 2100.....

Jan 22, 2006 | 08:09 PM

transam5.7lt1

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From: Texas

Sounds more like an internal vaccum leak on your brake booster....

Jan 22, 2006 | 09:41 PM

FlamingChicken

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thats what i was thinking as well. def check the booster

Jan 23, 2006 | 03:35 AM

whynot

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one more thing to consider is you intake manifold gaskets. it may of caused a vacume leak by blowing out part of the gasket.

Jan 23, 2006 | 08:05 PM

turbotimws6

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From: Hollywood

I was thinking that I have a blown intake gasket.
thanks for all yuor help.

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Jan 23, 2006 | 08:31 PM

slolt1

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check the check vale on the brake booster that may be cousing the problem if you let the car sit over night then try to pull the hose from the booster if it does not hve vacum the valve is letting it bled back into the engine

Jan 24, 2006 | 02:02 PM

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d-marlo1

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sounds more like an intake gasket, probably blown on the lower side, if so you won't hear a vaccum leak.

Jan 24, 2006 | 06:44 PM

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whynot

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From: Boise Idaho

Quote:

Originally Posted by dhdenney

Should be leaking some oil too if it's intake gasket.

that depends on where it blows out, on top it won't, on bottom it may.

Jan 24, 2006 | 06:52 PM

#12

transam5.7lt1

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From: Texas

I think slolt1 hit it there, might be the check valve on the booster.

Jan 29, 2006 | 09:03 PM

#13

turbotimws6

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From: Hollywood

checked the valve on the booster, it help vacum for two days. Went back over all of my vacum line( print out by my shop key program.There is no oil leaks nor does it consum any oil. I going to order the intake gaskets and a cam and install kit while the intakes off.

Jan 30, 2006 | 09:35 PM

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slolt1

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sorry about that i wish that info would have help you ou when you find out let us know

Feb 2, 2006 | 06:11 PM

#15

turbotimws6

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From: Hollywood

thanks for your help guys I keep you guys posted

Feb 2, 2006 | 08:30 PM

#16

95greenZ

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From: KY

Dude, I bet you blew the welds off the intake! (sorry couln't resist)

Have you checked the TPS maybe it was a coincedence that it started after the backfire. Just giving you other ideas.