engine stuck in high rev

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Mar 17, 2010 | 04:47 PM

CorvetteCody

Thread Starter

6th Gear

Joined: Feb 2010

Posts: 6

Likes: 0

From: Fort Worth Texas

engine stuck in high rev

I bought my first vette, an '85, a month ago. Today I was out driving and as I pulled into my neighborhood I noticed that my brake pedal was hard and the car wasn't stopping on command. As it finally slowed down I noticed that the engine was still reving up as if I had the gas pedal floored. I put it in park and turned off the engine, and when I turn it back on it goes right back to high rev.

Any ideas? I'm brand new to car maintenance, and have no idea what is causing this or how to fix it!

Thanks!

Mar 17, 2010 | 06:55 PM

surfer92

Pro

Joined: Oct 2009

Posts: 679

Likes: 0

From: vero beach florida

Check the Vacuum line going from the Brake power booster(big round cylinder connected to brake master cylinder) to the intake, hose will be about 3/4" in diameter.

Mar 17, 2010 | 07:35 PM

0Paul Ruggeri

Former Vendor

Joined: Nov 2006

Posts: 2,482

Likes: 3

From: Carmichael ca

Or the booster itself could be bad. Try pinching off the hose and see if the idle drops.

Mar 17, 2010 | 07:58 PM

CorvetteCody

Thread Starter

6th Gear

Joined: Feb 2010

Posts: 6

Likes: 0

From: Fort Worth Texas

Thanks, guys... I will see if I can find it and try that!

Mar 17, 2010 | 08:03 PM

88BlackZ-51

Race Director

Joined: May 2003

Posts: 10,749

Likes: 41

floor mats?

Mar 17, 2010 | 08:37 PM

Mark85Vett

Pro

Joined: Oct 1999

Posts: 515

Likes: 0

From: Nashua NH

I had that happen on mine...the return spring on the TB was broken, keeping the throttle from returning to idle position. I ended up buying a spring at the hardware store, and looping it from the throttle arm to the cable bracket...$1.50 fix until I replaced the TB.

Mar 17, 2010 | 08:49 PM

Cadmaro

Instructor

Joined: Sep 2008

Posts: 195

Likes: 25

From: Owasso Oklahoma

mght check and make sure the lever on the tb isnt stuck on the hose clamp for the "belows" lookin thin g btw the tb and maf. happend to me on the highway before and it wasnt too fun...

Mar 17, 2010 | 09:16 PM

CorvetteCody

Thread Starter

6th Gear

Joined: Feb 2010

Posts: 6

Likes: 0

From: Fort Worth Texas

Thank you all so much for your help. I was looking for the vacuum hose on the brake booster you all mentioned and I noticed another smaller "hose" that was loose. I think it's actually a cable, not a hose. It runs from the cruise control on top of the battery toward the engine. Once I attached it and tightened it the idle went back down to normal. Anyone know what cable/hose this would be?

Again thank you - I'm new to working on cars and had no idea where to start.

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Mar 17, 2010 | 11:35 PM

joes86vette

Instructor

Joined: Feb 2008

Posts: 139

Likes: 0

From: Katy Texas

I would definitely check the Throttle Body... It very much sounds like a strong candidate for this one... It's pretty easy to get to as well.

Good Luck!!!

joe

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