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Help! High idle and break pedal is stiff!

9541 Views 7 Replies 4 Participants Last post by  JDeBlois
Jus installed my 1.25 RC bl and it went on easy, relocated the fan shroud and all of a sudden my Jeep idles at 2000+ rpm and my break pedal barely depresses! What could it be?!?!
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The hard brake pedal is due to the high idle. You have reduced engine vacuum at high rpm's and lower or no vacuum assist in the brakes. You may need to reset your throttle position sensor or replace it altogether. If the tps is bad it will run at a high idle all the time.
 

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Discussion Starter · #4 ·
I don't think I unconnected anything that I didn't put back, any idea which hose it would be?
 

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Discussion Starter · #5 ·
The Jeep ran perfectly fine yesterday, Idk what I could've done to make the tps go bad..
 

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2004 Wrangler TJ, 42RLE auto trans. F/R lockers, 5.38 gears, Warn Winch, Currie 4" Suspension
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As Tangofox said, go for the brake booster hose. Having either end of that hose disconnected will result in your exact symptom. This is the large diameter rubber hose that connects the power brake booster (on the driver's side firewall) to the intake manifold where it gets its vacuum which powers the booster.
 

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Discussion Starter · #8 ·
TangoFox, Jerry Bransford, ya'll are geniuses. It must've come off when I was lifting the body. It runs like normal! THANK YOU.

Ya'll should get paid for this!
 
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