TOPIC: 1994 Yukon Dennis Laaker gets a kick!!!!

I performed a modification on Dennis Laaker's 1994 GMC Yukon.

I've seen many vehicles respomd, but this has to be the best response I've ever seen with

a throttle body injection tb.

After mod we went for a drive, and all Dennis could say was WOW WOW WOW.

He couldn't believe the horsepower kick the vehicle had.

Two days later I ran into him at the gas station, and he was reporting that he has seen

a decrease in fuel usage. I'm still waiting on mileage results, but this was a fun one

to see his reaction, and to see so much horsepower come from a little GROOVE.

Gotta love it.

I also relocated the idle air path by filling in the two paths from the butterflies up to the large area before the idle air control.

At first it didn't idle very good so I took off tb and made paths a little wider, as wide as the largest groove bit I have, and then it took off beuatifully.

I also rerouted the vacuum lines from the evap, pcv, and passive vent to the rear of the air filter where there was a port where the passive vent went.

Also, I moved the map sensor port location to the intake manifold with an extension to get the reading of the middle of the intake manifold pressure.

Happy grooving everyone

Hey Aron (dave here)

Question...

when you fired it up and it didn't idle well...why didn't you just use the throttle stop screw to increase idle? (or does it even have one?)

Tracy posted pictures here of the work he did yesterday and it looks like he did the same thing...(kinda)

(Congrats on the happy customer by the way)

Hi Carby-tater, I tried doing that and to my suprise it wouldn't idle right.

I have done many of these tbi's and it suprised me that it wouldn't idle correctly.

I could only assume it was the idle air because on this one I only opened up the pathway 1/8" then when I opened it up to 1/4 it idled and started perfectly.

Thanks for the comments to post. It's so neat to see so many people in the forums and to see a community helping each other out.

GadgetmanNebraska Aron Cheek

I would like to explain something I found out about where path is placed on tbi's for idle air.

We are actually moving the air path just above where the throttle shaft is.

This has been accomplished by placing tape around the inside of ports to continue shape of ports of tbi.

This also allows you to make more of a groove up the side of the port.

The whole idea is to relocate the idle air flow away from the groove.

I will be making a video soon of this procedure to point out the importance of this modification.

GadgetmanNebraska Aron Cheek

AronCheek... Hey. Did you take pictures? I want to see pics.