Posted By: JonC
TQ surging - 06/14/11 11:19 PM
I've got a big bore TQ on my 340 and at a slow steady cruise speed (some at highway speeds but not as bad) I get some slight surging and it seems every so often it sounds like it will die. It feels fuel related. Anyone?
Posted By: dOOc
Re: TQ surging - 06/14/11 11:31 PM
GIVE the tree a turn or so CLOCKWISE .... it will raise the rods and give it another jet-size or two.
Yes, I agree, try richening the primary metering rod tree.
Posted By: JonC
Re: TQ surging - 06/14/11 11:40 PM
Doing it now, then for a ride.
Posted By: JonC
Re: TQ surging - 06/14/11 11:50 PM
Went around town (small town) and it seems to be worse with 2 turns CW.
Posted By: dOOc
Re: TQ surging - 06/14/11 11:55 PM
do you know what rods are in there ?
Posted By: dOOc
Re: TQ surging - 06/15/11 12:08 AM
You might want to pull them out and check the "steps" in them ...
Posted By: JonC
Re: TQ surging - 06/15/11 12:23 AM
What would I be looking for, a baseline?
Posted By: RapidRobert
Re: TQ surging - 06/15/11 12:34 AM
CW raised the tree right? Might go a bunch more turns & if that helps, it confirm (or deny) that it's a lean prob which it sure sounds like classic lean
Posted By: T2R9
Re: TQ surging - 06/15/11 12:39 AM
Was it surging before the engine work? If it ran OK I would go back to where it was then maybe go 1/8th turn at a time and run it up the Golden road. Does the secondary air valve snap back into position if you tap the rear?
Posted By: JonC
Re: TQ surging - 06/15/11 12:48 AM
It was doing it before the engine work, and the last time I took it up the Golden Road I broke a frame rail on the speed bump before Abol bridge, forgot it was there and had 5 people in the car. I'll do some more tuning tomorrow. I'll let you know what I find.
Posted By: dOOc
Re: TQ surging - 06/15/11 05:00 AM
Are you able to pull the rods out? .. there should be THREE STEPS in the rods ...at least most of them do. If you have the TWO STEP ones ..... that could be why you don't see any diff.
Posted By: JonC
Re: TQ surging - 07/01/11 05:22 PM
I have adjusted the tree every which way and no change, could the floats be high?
Posted By: ademon
Re: TQ surging - 07/01/11 09:02 PM
i would open it up and check the floats, then set the height correctly