Cliff's Quadrajet Parts and Rebuild Kits

General Category => Quadrajet Carb Talk and Tips => Topic started by: pega_de on July 17, 2020, 10:03:45 AM

Title: WOT to rich on my stage 2 Q Jet
Post by: pega_de on July 17, 2020, 10:03:45 AM

Hello,

I have a 17058266 Rochester QJet (1978 Pontiac T/A - W72), stage 2 overhauled.

Idle is perfect
Cruise is perfect too
but WOT is much to rich with Lambda 0,6 / AFR around 10.

Secondary rods are the "DA".

What can I do to lean it a bit?

kind regards,

Marco

Title: Re: WOT to rich on my stage 2 Q Jet
Post by: Kenth on July 17, 2020, 01:53:06 PM

You may use a set of CK sec. rods too lean out WOT somewhat.
And make sure float is not set too high.
I have found original 17/32" setting works fine with proper fuel delivery to carb, higher settings only result in worse milage.

Title: Re: WOT to rich on my stage 2 Q Jet
Post by: pega_de on July 18, 2020, 12:52:08 PM

yes, we readjustet the fuel delivery.

Next what we try is to adjust the air doors. If it don't help, I try the CK rods.

The problem is, when we change from cruising to higher RPMs, the eninge got a very hihgh AFR (10) and a big power loss, after a bit we get the power back.

Title: Re: WOT to rich on my stage 2 Q Jet
Post by: pega_de on August 09, 2020, 06:04:59 AM

Short update, I've used a different hanger, and it works great.