Herm TDI
Vendor
- Joined
- Nov 21, 2001
- TDI
- 2002 Golf GLS Malone Stage 3, P+520 nozzles, 11MM Inj pump, Sachs VR6 clutch, Stelth Race Pipe, Immo Deleat, EGR Deleat
I have an A-4 Jetta that has experieanced a sudden loss of compression on #1 cylinder. Befor I go further here is a list of the diagnostic checks that have been compleated:
1. Verification of TDC (no TB slippage) ( I checked and confirmed, as of this moring)
2. Positive fuel delivery to each injector ( I did this test this moring)
3. Fuel injectors spray pattern and pop-off test
4. Swap the #1 injector from another ALH engine
5. Compression test ( Cyl #1 reads extreamly low)
Here are the results of the compression test:
Cyl #1 = 160 PSI
Cyl #2 = 480 PSI
Cyl #3 = 485 PSI
Cyl #4 = 480 PSI
I could not find (or see) any visual indication of a defect or malfunction within the valve-train components. The lobes of the cam-shaft and the surface of the cam followers look good.
This visual inspection indicates (to me) that the cause of the loss of compression is from another area of the engine. The engine does start (rough idle...smokes)
No harsh or metalic knocking noises as the engine runs it just idles rough.
I have not found any oil in the coolant or loss of coolant.
My instincts lead me towards the head gasket or a possiable valve problem.
What do you other "wrenches" think....anything I've over-looked?
1. Verification of TDC (no TB slippage) ( I checked and confirmed, as of this moring)
2. Positive fuel delivery to each injector ( I did this test this moring)
3. Fuel injectors spray pattern and pop-off test
4. Swap the #1 injector from another ALH engine
5. Compression test ( Cyl #1 reads extreamly low)
Here are the results of the compression test:
Cyl #1 = 160 PSI
Cyl #2 = 480 PSI
Cyl #3 = 485 PSI
Cyl #4 = 480 PSI
I could not find (or see) any visual indication of a defect or malfunction within the valve-train components. The lobes of the cam-shaft and the surface of the cam followers look good.
This visual inspection indicates (to me) that the cause of the loss of compression is from another area of the engine. The engine does start (rough idle...smokes)
No harsh or metalic knocking noises as the engine runs it just idles rough.
I have not found any oil in the coolant or loss of coolant.
My instincts lead me towards the head gasket or a possiable valve problem.
What do you other "wrenches" think....anything I've over-looked?