rough

[gogs]

any one know why it only runs smooth on half choke tried carb balance seems ok was thinkink with choke its enrichen it

[saabfast]

Logic says its running too lean. Could be the carb setup or an induction leak. Check the rubber carb mountings, they often crack, and the piped connections to the inlet manifold.

Alan
Saab 9000 Stg 1
Saab 9000 2.3 FPT Auto
'81 TR7 DHC

[Beans]

Can also be caused by partially blocked fuel line

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[Hasbeen]

Applying choke on an SU is EXACTLY the same as adjusting the mixture. Both lower the main jet, allowing more space for fuel to pass the needle.

However, half choke is a lot of richening of the mixture, so as above, you either have too much air, or not enough fuel.

Hasbeen

[Hasbeen]

Gogs how long have you had the car, & how has it been running?

A port & polish, mild cam, good exhaust system, & easy flow inlet filters, or some of these, will change the mixture requirements of an engine, & a 7 engine more than most.

If some of these have been done, you would require richer needles to re-tune for the modifications.

Has anything been changed, or did the car just start running this way?

Hasbeen