help_please help 2engines_going crazy_please help me fix this_anyone local? HELP ME

[omnisleeper]

please help me. I bought a 1985 omni with a full t2 setup. this had a brand new engine and head and turbo, forged piston over $5k invested in engine. The guy i bought it from had it started and after the first 2 10min runs it wont re_start. I tore down the engine everything looked fine but the cross hhatching in the cyclinders. I pulled pistons and re honed all cylinders. I reinstalled the pistons with brand new rings and put a full new gasket set in.. After putting everything back together it started perfect, ran alittle hot because of fan issues. Shut it off than took care of fan issues. restarted it than took it for a test ride. It drove perfect ran it for about 45 total mins. went to go restart and nothing. did a compression test and got the following reads. #1 30psi, #2 83psi, #3 110psi, #4 72psi. Now what should i look for? why is it doing this? this is a complete brand new engine. Is it bad machine work? are the cylinders washing out? cyclinder 1 seems to have the most issues. What should I do? who will help me? I'll pay. Who do I take it to in detroit metro area? I want this car running. I've built many many enginea but have never had anyother issues like this? please please help me so i can start beating mustangs. I want to run 11_12 1/4miles. again help me. 248-505-7266

[moparfwdsleeper]

Any codes?

Logic Module Turbo Fault Codes (accuracy maybe in question, please review!)

[omnisleeper]

no codes, i pulled the engine and unplugged the battery.thx

[crazymadbastard]

wowzers- low compression has nothing to do with a code. I suggest you do a leakdown test, compression is getting past the pistons or the valves(maybe valves are not seating?). did you beat on the engine?
Did you check the piston ring gap? dunno what else other than a cracked piston could give such low compression.

[tryingbe]

Time to rebuild the engine again.

[crusty shadow]

sounds like you might have a warped head or bad cylinder hone. did you use new headbolts?
can take the valve cover off, remove the cam followers, and take a 1/2 in drive extension and a large hammer. place the extension on the valve tip and smack it good with the hammer- the valve should go down and snap right back up. they should also be at the same height- if any of em are hanging down lower you have somthing binding the valves up. the 8 valve heads have a problem with the guides dropping down out of the head, and will put the valves in a bind when that happens.
if they check out ok pull the head, and check it for warpage with a straight edge and a feeler gauge. no more than .004 warpage is allowed at any point. check the combustion chambers and mating surface of the head for cracks.
you also stated you saw somthing wrong with the cross-hatch pattern in the bore? what did it look like to make you think that? did you take any pics? if you end up pulling the head off take pics of the head, and cylinders so we can see whats going on

[looneytuner]

Is the engine not turning over or not starting when it turns over?

[cprossu]

Quote:

the following reads. #1 30psi, #2 83psi, #3 110psi, #4 72psi

yeesh, how many puffs, and is that a wet or dry compression test?

[EvilcowRoland]

Um, wait. You have a freshly rebuilt engine with NEW piston rings. You ran the car for 10 minutes then shut it off. Then you drove it for 45. At any point during this process did you follow proper ring break-in procedure? If you drove it normally without seating the rings then I would expect your compression to be a bit off. Not trying to be a jerk, just need to know it was done right so we can eliminate possibilities.

When you did the compression test, was the engine warmed up? Did you have the throttle plate open while cranking? Did you let the engine roll over a few times to build up pressure? Lots of maybes here. We need more info on exactly what you did and what you found when all this happened.

[omnisleeper]

let engine turn over 5times for compression test and it was a wet test.it did have great compression before i started it. yes it did have the proper ring gap. i did proper break+in and didnt beat on it. engine is out. head is off. anyone local? michigan

[omnisleeper]

please help me. I bought a 1985 omni with a full t2 setup. this had a brand new engine and head and turbo, forged piston over $5k invested in engine. The guy i bought it from had it started and after the first 2 10min runs it wont re_start. I tore down the engine everything looked fine but the cross hhatching in the cyclinders. I pulled pistons and re honed all cylinders. I reinstalled the pistons with brand new rings and put a full new gasket set in.. After putting everything back together it started perfect, ran alittle hot because of fan issues. Shut it off than took care of fan issues. restarted it than took it for a test ride. It drove perfect ran it for about 45 total mins. went to go restart and nothing. did a compression test and got the following reads. #1 30psi, #2 83psi, #3 110psi, #4 72psi. Now what should i look for? why is it doing this? this is a complete brand new engine. Is it bad machine work? are the cylinders washing out? cyclinder 1 seems to have the most issues. What should I do? who will help me? I'll pay. Who do I take it to in detroit metro area? I want this car running. I've built many many enginea but have never had anyother issues like this? please please help me so i can start beating mustangs. I want to run 11_12 1/4miles. again help me. 248-505-7266

help help help any ideas yet

[jim34]

Ok have you driven the car yet or are you saying it has lost compression just from sitting in the driveway idling ? because with those compression readings the car shouldn't even start.

[EvilcowRoland]

That's what he's saying. He took it for a drive, then when he got back it wouldn't restart. At the no-start condition, he had those compression readings.

Did you have the head checked when it was off to make sure it wasn't warped or cracked? If you're absolutely sure those are true compression numbers then you have a major mechanical problem. It has to come back apart. No other way around it.

[Austrian Dodge]

Quote:

Originally Posted by omnisleeper please help me. I bought a 1985 omni with a full t2 setup. this had a brand new engine and head and turbo, forged piston over $5k invested in engine. The guy i bought it from had it started and after the first 2 10min runs it wont re_start. I tore down the engine everything looked fine but the cross hhatching in the cyclinders. I pulled pistons and re honed all cylinders. I reinstalled the pistons with brand new rings and put a full new gasket set in.. After putting everything back together it started perfect, ran alittle hot because of fan issues. Shut it off than took care of fan issues. restarted it than took it for a test ride. It drove perfect ran it for about 45 total mins. went to go restart and nothing. did a compression test and got the following reads. #1 30psi, #2 83psi, #3 110psi, #4 72psi. Now what should i look for? why is it doing this? this is a complete brand new engine. Is it bad machine work? are the cylinders washing out? cyclinder 1 seems to have the most issues. What should I do? who will help me? I'll pay. Who do I take it to in detroit metro area? I want this car running. I've built many many enginea but have never had anyother issues like this? please please help me so i can start beating mustangs. I want to run 11_12 1/4miles. again help me. 248-505-7266 help help help any ideas yet

Did you verify the timing belt is still installed correctly and didn't jump a few teeth?

Andy

[tryingbe]

Take it to a shop and have them diagnosis it.

Copy and paste what you type the first time over and over and over is not going to help your problem.