me612
20+ Year Contributor
- 1,423
- 5
- Aug 8, 2002
-
Minneapolis,
Minnesota
OK well first I'll give a little info on the car. 1991 Talon AWD, 110k miles. Mods are 50trim, stock longblock, typical supporting mods.
Yesterday I received my 3g lifters in the mail, so I put them in. I also changed the timing belt when I did this. I've done a dozen timing belt jobs before, so I'm 99.9% sure I did it right (I say 99.9 because obvoiusly something is wrong here so maybe somewhere somehow I did something wrong). I compressed the lifters before installing them also. Now basically I get this all together, and I pull the MPI fuse, let it rev for a little to get oil pumped through everything. Put it back in, go to start it, and nope. If I floored the pedal, it would start but wouldn't stay running. I decide to do a compression test (I was 150 across the board a month ago) now I'm at 150-0-0-150. I was told a leak down test won't work with absolutely 0 compression. You have to have atleast a little. I don't know, I decided to go back and check my timing belt again. It is still lined up perfectly. I figured maybe something happened somehow and I bent a valve. I took the head off, and everything looks to be fine. No valves "look" bent, the pistons look great (you can tell I just did the MCCC Cleaning!). Headgasket looked fine, I'm really confused. I'm bringing the head in to get pressure tested since it's out, but I'm wondering what else this could have been. What all can cause absolutely 0 comression? Not even 50psi of pressure, just flat zero. What could I have overlooked here?
Yesterday I received my 3g lifters in the mail, so I put them in. I also changed the timing belt when I did this. I've done a dozen timing belt jobs before, so I'm 99.9% sure I did it right (I say 99.9 because obvoiusly something is wrong here so maybe somewhere somehow I did something wrong). I compressed the lifters before installing them also. Now basically I get this all together, and I pull the MPI fuse, let it rev for a little to get oil pumped through everything. Put it back in, go to start it, and nope. If I floored the pedal, it would start but wouldn't stay running. I decide to do a compression test (I was 150 across the board a month ago) now I'm at 150-0-0-150. I was told a leak down test won't work with absolutely 0 compression. You have to have atleast a little. I don't know, I decided to go back and check my timing belt again. It is still lined up perfectly. I figured maybe something happened somehow and I bent a valve. I took the head off, and everything looks to be fine. No valves "look" bent, the pistons look great (you can tell I just did the MCCC Cleaning!). Headgasket looked fine, I'm really confused. I'm bringing the head in to get pressure tested since it's out, but I'm wondering what else this could have been. What all can cause absolutely 0 comression? Not even 50psi of pressure, just flat zero. What could I have overlooked here?
