no compression
Token Redneck
Joined: Jun 2007
Posts: 9,339
Likes: 350
From: Breckenridge, TX
Torque Pro has a PID that comes as "HPOP", IIRC it's coded as ICPV mapped against a conversion table to PSI. That doesn't change the fact that the PCM will not report an actual ICP reading in psi. Not sure if it's one that comes with the Pro version 6.0 extended PIDs or if it has to be coded, I never paid for the real version of Torque.
Scangauge, DashBoss, and Edge will not show actual ICP in PSI.
Scangauge, DashBoss, and Edge will not show actual ICP in PSI.
Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
Exactly. It's not hard to convert ICPV to psi. A lot of scanners do it. But I do have to admit that the first "mechanic" that looked at it really didn't know what he was doing so it is possible that he looked at the wrong PID.
Postmaster
Joined: Jan 2008
Posts: 3,174
Likes: 10
From: Kansas City MO
I've seen engines that sit for a while have low compression. If the oil is basically bled off the lifters the valves might not be opening fully. That would give a funky crank. How much did you crank it?
Lead Driver
Joined: Feb 2011
Posts: 8,241
Likes: 155
From: L.A. (Lower Alabama)
Torque Pro has a PID that comes as "HPOP", IIRC it's coded as ICPV mapped against a conversion table to PSI. That doesn't change the fact that the PCM will not report an actual ICP reading in psi. Not sure if it's one that comes with the Pro version 6.0 extended PIDs or if it has to be coded, I never paid for the real version of Torque.
ScanGauge, DashBoss, and Edge will not show actual ICP in PSI.
ScanGauge, DashBoss, and Edge will not show actual ICP in PSI.
Thread Starter
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Freshman User
Joined: Dec 2014
Posts: 43
Likes: 0
no compression
sorry for the delay out of town, just got the compression passenger side front to back 160 100 80 41, drivers side 120 0 20 10. obviously very low my question is would sitting for 1 year cause enough gunk on the heads to block the valves,would bad head gaskets cause this or any other ideas?
Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
How much time between the passing er sidding and the drivers side? Those numbers could indicate a plugged exhaust if all the glow plugs where not removed before starting yhe test.Did you have a battery charger on it during the test? A week battery causing slower cranking will also show a steady decrees in compression.
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Postmaster
Joined: Jan 2008
Posts: 3,174
Likes: 10
From: Kansas City MO
I've yet to see an engine that I couldn't start,, unless it has a hole in the block or the crank is locked up. It might cost a starter,, but I would make sure it's full of oil and crank the heck outta it. 0 compression is crazy tho. This one was zero
I started this truck and pulled it in the bay btw
I started this truck and pulled it in the bay btw
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Freshman User
Joined: Dec 2014
Posts: 43
Likes: 0
the glow plugs were all removed and the batteries were new. we did crank on it for a long time and tried starter fluid and didnt hit a lick. havent taken the heads off yet but unless ya'll have something different in mind i think thats next
Fleet Mechanic
Joined: May 2011
Posts: 1,866
Likes: 84
From: Rainier OR
I would do a leak down test. Put compressed air into the cyl and see where the air is going. Make sure the intake and exhaust valves are closed on the cyl you are testing. You don't really need a tester. Just regulate air pressure to about 50 psi and listen to where the air is going.
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