Reeally low RPM Idle....

MikeMetzger · Oct 19, 2014

Hey guys/gals,

My pro has been idling really poorly once warmed up. So slowly that the gauge loses power then comes back on etc.

Has anyone else had this issue or heard of this happening? Any ideas of a probable cause?

Laundryboy · Oct 19, 2014

Is it a recent problem?

MikeMetzger · Oct 19, 2014

Started around the end of last season. Was to the point that I couldnt get in reverse because of the low idle it would just die.

Steinegal · Oct 19, 2014

Have you replaced the sparkplugs?

skibreeze · Oct 19, 2014

bad reeds can do that.

ByDesign · Oct 19, 2014

Classic symptoms of the TPS failing...sometimes they can be reset.

Laundryboy · Oct 19, 2014

Checking your TPS voltage might be revealing.

TRS · Oct 19, 2014

If your TPS is correct, do a leak down test.

MikeMetzger · Oct 19, 2014

I was definitely leaning toward the TPS sensor. I will look into that first and let ya know what I find! Thanks guys!

Sheetmetalfab · Oct 19, 2014

TRS said:
If your TPS is correct, do a leak down test.

This^^^^

Do a leak down test anyways.
Even if it runs fine.

Butta · Oct 19, 2014

This was usually a sign on the CFI4's that meant the motor was about done...piston skirt scarring and eventually getting the "DET" sensor with limp mode to get back to the trailer. Pull the exhaust valves and take a look at the pistons, at the least. But the above advice is solid.

diamonddave · Oct 20, 2014

I wouldn't disagree with any of the advice above but I would check the throttle cable adjustment first. Too much slack or not enough will cause idle issues.

SRXSRULE · Oct 20, 2014

diamonddave said:
I wouldn't disagree with any of the advice above but I would check the throttle cable adjustment first. Too much slack or not enough will cause idle issues.

Dont overlook this! Had to adjust the cable on my 12 and 14 to resolve idle/reverse issues. Eric

Laundryboy · Oct 20, 2014

I can see how a misadjusted throttle cable could cause a fast idle but I don't see how it could cause a slow idle.

purepolaris600 · Oct 20, 2014

fual pump

Check tps also pull a amp draw on fual pump thats what happened to mine pump pulling 12 amps pullimg the whole system down

diamonddave · Oct 20, 2014

Laundryboy said:
I can see how a misadjusted throttle cable could cause a fast idle but I don't see how it could cause a slow idle.

Throttle adjustment has been very critical on Polaris CFI's going back to the Dragon days.

If there's too much slack in the throttle cable then the throttle switch doesn't close and the throttle switch will not register "closed throttle" to the ECM. In this situation, the ECM thinks the throttle is stuck in a possible wide open position.

The symptom can be low idle with possible runnability issue's, slow rev's, backfiring, etc.

I've seen this so many times I can't count.

MikeMetzger · Oct 20, 2014

How do you know the proper tension on the cable? just tighten until the idle picks up?

SRXSRULE · Oct 20, 2014

Throttle Lever Free Play: .010-.030 (0.25-0.8mm)

Turning the in-line adjuster inwards (clockwise) will
increase throttle lever free-play.
Turning the in-line adjuster outwards (counter-clockwise)
will decrease throttle lever free-play.
After setting the throttle lever free play, always verify the oil
pump adjustment is set correctly.

This is copied from the shop manual. The cable adjuster is on the right side of the bars, about 5-6" from the throttle block. Slide back the plastic sleeve and you will see the adjuster. Eric

MikeMetzger · Oct 23, 2014

found this last night while going through everything. Could be the issue.......

diamonddave · Oct 23, 2014

Definately coul be...

Reeally low RPM Idle....

Well-known member

Well-known member

Well-known member

Member

Well-known member

Well-known member

Life Member

Well-known member

Well-known member

Well-known member

Chilly’s Mentor

Well-known member

Well-known member

Well-known member

Chilly’s Mentor

Well-known member

Well-known member

Well-known member

Chilly’s Mentor

Similar threads