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1G no start, slow crank, low compression, backfires

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enjee

Probationary Member
18
7
Feb 25, 2023
Lavon, Texas
Hello everyone, I have a few questions about my 1g DSM. To catch yall up, I bought the car about 3 months ago for 1k. It had a no-crank problem which was solved by a faulty clutch switch. Other than that a few new parts on the car include; an alternator, mas, spark plugs, fuel pump, fuel filter, battery, and an oil change.

Once I got it to crank I realized it was very slow. I tried using starter fluid to get it going but it caused a backfire in the intake. So I ran a compression test and all the cylinders have 50-60 psi readings.

My question is, Could this be a timing issue? Are my valves bent? Do I check my camshafts?
 
I have to ask, did you rotate either cam more than a 1/8 of a turn or so with the belt OFF?
i rotated the exhaust cam a tooth ahead of the intake cam that way it would line up after a put the belt back on. Once the belt was on I rotated the crank 4 times and everything still lined up. I was even able to put the cam gear lock tool in place.
 
Rotate SIX times to get it back to the point you started at on a 4g63. Just FYI.
 
What fuel rail bolt? One of the three long ones that hold the rail in position, or one of the two at each end that hold the fuel hose fitting and pressure regulator on? I am not sure how that would affect fuel pressure unless you had gasoline spraying out somewhere. Compression test for sure- that will be really big here. We need to rule out bent valves, which can happen if the valve timing were out significantly or if the timing belt ever broke, or if you rotated the cam shafts too far while the belt was off. The pistons and valves can collide in this engine, and valves have been bent that way. If the compression looks much better than it did before, try the starting fluid again.
 
What fuel rail bolt? One of the three long ones that hold the rail in position, or one of the two at each end that hold the fuel hose fitting and pressure regulator on? I am not sure how that would affect fuel pressure unless you had gasoline spraying out somewhere. Compression test for sure- that will be really big here. We need to rule out bent valves, which can happen if the valve timing were out significantly or if the timing belt ever broke, or if you rotated the cam shafts too far while the belt was off. The pistons and valves can collide in this engine, and valves have been bent that way. If the compression looks much better than it did before, try the starting fluid again.
it’s one of the longer bolts. I already ordered a new one. I’m out of town so i’ll have to check compression when i get back.
 
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