PERDELS Question...
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Senior User
Joined: Jan 2003
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From: Jacksonville
PERDELS Question...
Ran the Change Rotational Velocity test on the old girl today, with the following results:
Cylinder 3: .7
Cylinder 5: 2.5
Cylinder 8: 5.5
The rest were zeroes. I know that it should be expected to show something on 3 and 8, but what about that number on 5? These numbers all drop to zero when any throttle is applied. 8 fails cylinder contribution test, which is fairly normal, as I understand. Do I have a problem? I'm about to replace the valve cover gasket on the passenger side due to a leak, so I'm gonna be in there anyways...
Cylinder 3: .7
Cylinder 5: 2.5
Cylinder 8: 5.5
The rest were zeroes. I know that it should be expected to show something on 3 and 8, but what about that number on 5? These numbers all drop to zero when any throttle is applied. 8 fails cylinder contribution test, which is fairly normal, as I understand. Do I have a problem? I'm about to replace the valve cover gasket on the passenger side due to a leak, so I'm gonna be in there anyways...
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 9
From: Snohomish, WA
2.5 isn't bad. I wouldn't sweat it. I have run these tests on several trucks and a slight variance is normal. Until you get to 5% the CCT will pass. (Unless is it a manual transmission truck)
I suspect you have the grey CPS. That accounts for #8 being high and failing.
I suspect you have the grey CPS. That accounts for #8 being high and failing.
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
2.5 isn't bad. I wouldn't sweat it. I have run these tests on several trucks and a slight variance is normal. Until you get to 5% the CCT will pass. (Unless is it a manual transmission truck)
I suspect you have the grey CPS. That accounts for #8 being high and failing.
I suspect you have the grey CPS. That accounts for #8 being high and failing.
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 9
From: Snohomish, WA
Manual trucks will fail a CCT when they see over 3%. The difference is the rotating mass of the torque converter on the automatics. For an Auto, the CCT should be taken with the transmission in Drive. I have tried it both ways and don't see a whole lot of difference, but that is what the manual states.
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