QJet Adjustments

[ray_mcavoy]

Originally Posted by Mattman2010

I am pretty sure the PO has a linkage I can use because I was asking him about it when I first pulled the engine and he said I dont need it.

Yeah, get that linkage and hook it back up. Sounds like the PO wan't very familiar with how QJets work.

They have mechanical secondary throttle blades with a set of "air doors" on top. The air doors open based on engine demand (the air flowing past them pulls them open). That vacuum can & linkage that the PO removed doesn't actually open the secondary air doors. Instead, it acts as a damper to keep them from opening too quickly. There's also a torsion spring that controls the opening rate.

The bog you're getting is a sure sign that the secondary air doors are opening too quickly because of the missing parts. The air doors also operate the secondary metering rods that irishman999 mentioned. With the missing parts, the air doors are likely opening too far (beyond engine demand) and in turn, pulling the secondary rods to the max rich position.

[motornut]

I second that,
and have made some temp linkages outa cut up bits of metal cloths hangers

Originally Posted by ray_mcavoy

Yeah, get that linkage and hook it back up. Sounds like the PO wan't very familiar with how QJets work.

They have mechanical secondary throttle blades with a set of "air doors" on top. The air doors open based on engine demand (the air flowing past them pulls them open). That vacuum can & linkage that the PO removed doesn't actually open the secondary air doors. Instead, it acts as a damper to keep them from opening too quickly. There's also a torsion spring that controls the opening rate.

The bog you're getting is a sure sign that the secondary air doors are opening too quickly because of the missing parts. The air doors also operate the secondary metering rods that irishman999 mentioned. With the missing parts, the air doors are likely opening too far (beyond engine demand) and in turn, pulling the secondary rods to the max rich position.