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C6 Rebuild

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Danno View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Danno Quote  Post ReplyReply Direct Link To This Post Topic: C6 Rebuild
    Posted: 04-October-2017 at 2:41AM
Any expert troubleshooters out there?  I did a master rebuild kit overhaul on 72 C6.  Not working out too well.  I don't have good engagement.  Here are the line pressure readings I got.  Any ideas on what to check out?
 

I bought a really good gauge that is glycerin filled and it goes up to 300#.   So here are the readings I got last night.  Also, I disconnected the vac mod from engine vac and put a vac pump on it and gave it 20".  It holds pretty well.  I wanted to eliminate the mod as an issue, since my engine vac is kind of low.  In summary, it looks like pressure is kind of normal in P, R and N, but low/zero in all forward gears.

 

Start the car, and in Park I get an immediate 50# line pressure with 15" vac at idle, right around 1000 rpms. Slowly rev engine up to 1800 rpms, vac climbs to 20" pressure remains steady at 50#.  Back to idle at 1000 rpms.

 

P to R, pressure drops to 0, vac stays at 15", after a 6 sec delay, engine starts to load up and you see vac drop off to 11".  At that time, pressure builds back up to 50# and then moves back and forth between 50-60#.  With 50-60# and 11" I could move the car in reverse.

R to P: Pressure stays at 50# and vac jumps right back to 15"

P to R to N (quickly go through reverse right into neutral):  Pressure dropped to 0 but popped back up to 50# quickly (as soon as I was in neutral), all the while vac stayed at 15".

N to D:  Pressure immediately drops to 0 and vac stays at 15".  Nothing going on here.

D back to N: Pressure pops back up to 50# and 15".

N to R: pressure drops to 0, vac stays at 15", after a 3 sec delay, engine starts to load up.  Pressure returns to 50# as Vac drops to about 11" and it then feels like I am in fact in Reverse.  Pressure stays steady at 50#.

R to P: Pressure stays at 50# and vac jumps right back to 15".

 

Round 2:

P to R:  Same as above, 0 #, delay and then at 50# and 11".

R to N: Pressure stays at 50# and vac jumps right back to 15"

N to D: Same, but this time, engine tries to load up, you see pump pressure trying to move off 0, but it doesn't.

D to 2: 0 and 15"

2 to 1: 0 and 15"

1 to 2: ""

2 to D: ""

D to N:???It stayed at 0 and 15!! Weird.  Why didn't it pop back up to 50#.

N to R: ???It stayed at 0 and 15!!

R to P: ???It stayed at 0 and 15!!

 

Round 3:  Let things settle out.  Back to 50# in Park.

P to R:  Same as above, 0 #, delay and then at 50# and 11".

R to N:  Pressure stays at 50# and vac jumps right back to 15"

N to D: Press drops to 0, 8 sec delay engine starts to load up a little, 13".  And this time pressure limps up to 20-30# but no higher.

D to N: Pressure pops back up to 50# and 15".

N to D: Press drops to 0, 8 sec delay engine starts to load up a little, 13".  And this time pressure limps up to 20-30# but no higher.

Back to Park, end of test.
Danno
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aquartlow View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote aquartlow Quote  Post ReplyReply Direct Link To This Post Posted: 04-October-2017 at 10:58AM
Try here for C6 "learnin", http://www.network54.com/Forum/260730
great bunch of guys that will help.
www.supermotors.net/22468
Yeah, It's a Hybrid...It burns gas and tires.

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