My rig's check engine light came on after i installed the type "O" gasket on the throttle body. Any ideas on what's wrong with it? I rest the battery but it came back again after 10 miles of driving. Thanks.

George

 

You have a vacuum leak. Check for proper orientation of the gasket, it only fits one way correctly. Check for proper torque of the bolts and nuts that hold the TB to the manifold.

Hope this helps.
G

 

Thanks a lot.

George

 

Yep, what he said.
Definately a vacum leak there or wrong gasket orientation.

 

So should the gasket just go straight on? Or should I try to help the seal with something - kind of like how you use the motor oil on the oil filter before you screw it on?

 

The problem's solved. It was a vacuum leak due to one hose underneath the throttle body not being connected. I didn't see it when i reinstalled because it was directly underneath and i didn't disconnect it on purpose. It was disconnected when i was pulling out the throttle body. Here is a pic of the culprit.



Again, thanks a lot for all your help. Yotatech rocks!!!!

George

 

when i installed the O gasket my rpm's jumped about 500, and from past experiences with making my truck idle higher i got a check engine light , the high idle tripped a sensor and threw a CEL. when i installed my O gasket i just adjusted the throttle cable to lower my idle.

 

I did the same thing... Twice.

Once on my truck when I installed a trottle body adapter two years ago (and didn't find it until Dr. Z spotted it in a picture - ALMOST A YEAR LATER!). Then it happened again - this time by accident - when I installed an O gasket on FunRunner's truck.

 

ahhh.... so the first time you were just testing Dr. Z, right?

 

Yeup Yeup Yeup.... That's my story and I'm sticking to it.