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FIXITMAN, Master Technician
Category: Audi
Satisfied Customers: 17284
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No compression on 4,5,6 after replacing cam chain tensioner

Customer Question

No compression on 4,5,6 after replacing cam chain tensioner the cylinders are holding air pressure on 4,5,6 even when cam is in position to have valves open
JA: Do the vents feel cold? Is there a coolant leak?
Customer: No coolant leak valve cover off engine cold
JA: What is the model/year of your Audi?
Customer: 2000 a4 2.8l
JA: Are you fixing your A4 yourself? What have you tried so far?
Customer: Yes tried lashing valves by leaving cam lobes closed on each set of valves several hour each
JA: Anything else you want the mechanic to know before I connect you?
Customer: Other bank great compression valves do not appear to be opening at all
Submitted: 8 months ago.
Category: Audi
Expert:  FIXITMAN replied 8 months ago.

Hello, my name is***** you tell me if the other chain had broke? What are your compression readings on the vehicle?

Customer: replied 8 months ago.
Chain did not break plastic guide on tensioner cracked decided to change tensioner pulled cams followed chitons directions replaced tensioner not getting any compression on 4,5,6
1 150lbs, 2 145lbs, 3 150 lbs
Valves on 4,5,6 not opening used compression gauge hose end to put 70 lbs of air pressure in 4,5 & 6
Holds pressures whether cam loves in open or closed position
My thinking is the lifters are not creating enough pressure to open valves
Expert:  FIXITMAN replied 8 months ago.

You would get some pressure if the valves were not opening. Either the cam is still out of alignment or you have a bad cam adjuster. If this is faulty or stuck then it will cause this to occur.

Customer: replied 8 months ago.
both intake and exhaust cams are aligned to alignment marks when crank is at TDC on #1 cylinder as chitons illustrates cam chain tensioner appears to be working correctly no slack in chain 16 rollers. Between intake cam mark and exhaust cam Mark as spec provides still believe valves not opening when cam lobes down (depressing lifter) on either intake or exhaust valves for each of these 3 cylinders they still hold air pressure valves can not be opening or pressure would leak out
Expert:  FIXITMAN replied 7 months ago.

Do you have a cylinder leakdown tester and are the valve covers still off?