Author Topic: WOT to rich on my stage 2 Q Jet  (Read 157 times)

Offline pega_de

  • Garage guy
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    • F Body Forum Germany
WOT to rich on my stage 2 Q Jet
« 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

Offline Kenth

  • Carb lover
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Re: WOT to rich on my stage 2 Q Jet
« Reply #1 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.

Offline pega_de

  • Garage guy
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  • Posts: 9
    • F Body Forum Germany
Re: WOT to rich on my stage 2 Q Jet
« Reply #2 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.