4.6L 4v Tech for the 4V Cobra motors and Mach 1

tb spacer problem

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Old 10-23-2006, 02:04 PM
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tb spacer problem

i installed my tb spacer today but i couldnt get the car to idle properly id get it to idle just below 1thousand then id tap the gas up to 3 thousand then the car starts to sputter like its gonna die out cause the rpm would play from 500 hundread to about 9 hundread rpms..

on my second attempt the car would rev at 3thousand rpm and i wouldnt even have to apply gas to take off.. but the car didnt sputter this time lke its gonna shut off.

anyone experience this before??? i really dont wanna play with the throtell idler much cause im sacred im gonna mess it up even more any suggestions or tips???...
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Old 10-23-2006, 05:52 PM
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Did you install everything back to where it should be.When i installed mine,and fired it up after i was done,it rain just like it did before the spacer was on.Almost sounds like you got a vacuum leak.
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Old 10-23-2006, 09:02 PM
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i checked for gapping air around the tb but theres nothing... i keeped re-adjusting the brackets that extends the cable linkages and it got better each time the idiling.. but it would get worse once i started to drive it.. it would get stuck at like 3thousand rpms....
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Old 10-23-2006, 09:32 PM
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Sounds like a throttle linkage/adjustment problem to me, is it possible the throttle linkage is contacting something it wasn't before? Disconnect the linkage and check for smooth operation of the cable-it should move very easily. I'd also make sure nothing is contacting the throttle plate.
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Old 10-23-2006, 11:08 PM
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yea it was moving freelly before... it justwhen i rev it it would rev high and stay that way or it would go back down to like 500 rpms or so and jump up and down sputering... i tried re-adjusting the extension brackets for the cables and i would get it perfect on idle until i start driving then it would get weird
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Old 10-24-2006, 01:10 AM
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Humm that is wierd!, It kinda does sound like a vacuum leak to be sure use propain...and if it is not the vacuum, It is for sure a throttle linkage, and/or cable.......Oh did you put the return spring back on your throttle linkage?
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Old 10-24-2006, 11:11 AM
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yea i put the spring back on that was the only thing i disconected from the linkaged.

in the kit they gave me a extra bracket for extending the cables that are mounted on the plenum am i supposed to use that one too??? but were would it go...
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Old 10-24-2006, 09:03 PM
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Sorry,i didn't realize it was the spacer that goes between the throttle body and intake,thought it was the intake spacer.LOL
Still sounds like a vacuum leak.though!!
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Old 10-24-2006, 09:44 PM
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how abouts can i go ahead and fix the leak .. sorry im a newb at this... i made sure i couldnt feel no air scapping threw?
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Old 10-25-2006, 05:39 PM
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You can try to locate a possible vacuum leak by spraying some WD-40 around the area and listen for an RPM change. Is the car stick or auto?
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