Indigo PCV question

[Bob N]

I recently installed an Indigo PCV system on my engine. It eliminated oil smoke in the engine compartment. But I seem to have a problem: I think I have the idle adjusted OK, but I now have a pronounced "flat spot" when I accelerate. The engine bogs down at about 1/4 to 1/3 throttle and then speeds up after I continue pushing the throttle forward. Will enriching the idle adjustment help?

The engine also stalled this weekend while running at cruising speed. I suspect a bit of water in the carb or a bit of crud in the carb jet. It cleared after a few minutes and seemed to run fine. (I will try opening the main passage plug to see if I have any water in the carb.) The previous weekend it ran fine with the new Indigo PCV valve, so I don't think the stalling was related to the PCV valve.

[hanleyclifford]

The PCV valve does constitute a vacuum leak and you will have to turn the idle jet screw slightly clockwise to compensate.

[Al Schober]

Hanley,
I think you meant clockwise - to cut down the air flow. The idle jet controls air, not fuel.

[Dave Neptune]

Try a tic of adv.

Bob, try a couple of degrees of advance. Rotate the distributor bout 1/8" around the od of the cap. This may get rid of the flat spot. I have been using one for many years and have had no issues at all~~ very pleased having cleaner air at the same time.

Dave Neptune

[67c&ccorv]

And the race is on!

[joe_db]

My PCV valve does not seem to do this. I doubt the cruise speed stall was related. For the other, try adjusting the mixture.

[Bob N]

Thanks.

I'll try your suggestions.

[ndutton]

It's admirable the guys here are trying to help but maybe a call to Indigo is in order. After all, it's their product. I'm sure they have some sort of customer service.

[roadnsky]

It's admirable the guys here are trying to help but maybe a call to Indigo is in order. After all, it's their product. I'm sure they have some sort of customer service.

Do I dare pick at the scab?
Should I point him to the "you-know-what" thread?

[ndutton]

Do I dare pick at the scab?

Darn it, I've tried to exhibit a little restraint this time and so far the meds are working but there's a limit and I've been known to have a hair trigger so fair warning.

As I said, the generous assistance of the members here is as always commendable but it's interesting when a customer seeks out problem solving from the competition's resource. I don't mean to single out this instance, it's actually quite common around here.

[JOHN COOKSON]

I recently installed an Indigo PCV system on my engine. It eliminated oil smoke in the engine compartment. But I seem to have a problem: I think I have the idle adjusted OK, but I now have a pronounced "flat spot" when I accelerate. The engine bogs down at about 1/4 to 1/3 throttle and then speeds up after I continue pushing the throttle forward. Will enriching the idle adjustment help? The engine also stalled this weekend while running at cruising speed. I suspect a bit of water in the carb or a bit of crud in the carb jet. It cleared after a few minutes and seemed to run fine. (I will try opening the main passage plug to see if I have any water in the carb.) The previous weekend it ran fine with the new Indigo PCV valve, so I don't think the stalling was related to the PCV valve.

IMO.........
Get the water and KRAP out of the carb and fuel system then go from there.
The PVC valve could be a red herring. Or it may be sticky. Or it may be the wrong one.
Changing the idle won't help the engine run better at 1/3 throttle.

TRUE GRIT

[edwardc]

In my experience, the "flat spot" usually comes at the transition from the idle circuit to the main jet.

I got rid of mine by a combination of getting the mixture right (confirmed with a fuel:air ratio gauge) and a small advance in timing.

[joe_db]

We do a *lot* of homebrew inovation on here that takes away from Moyer selling their bits. Moyer Marine is extraordinarily tolerant of this. THANKS
They also are not losing out on PCV sales, since they don't have one

Darn it, I've tried to exhibit a little restraint this time and so far the meds are working but there's a limit and I've been known to have a hair trigger so fair warning.

As I said, the generous assistance of the members here is as always commendable but it's interesting when a customer seeks out problem solving from the competition's resource. I don't mean to single out this instance, it's actually quite common around here.

[ndutton]

They (MMI) also are not losing out on PCV sales, since they don't have one

My point had nothing to do with loss of sales but rather how fortunate for Indigo that their problem solving is available here.

[tony201]

I agree , I think it is OK to use the I word HERE , IT'S ALSO A PART OF WHAT MAKES THE LITTLE FOUR BANGER OF OURS WORKA LITTLE BETTER SUCH AS THE 3 BLADE PROP