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Old 06-28-2018, 01:49 AM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 41,339
 

2003 L-Series 3.0L Sedan
Default Re: need help, serious (time to come clean)

1-Do you know how to mechanically time an engine? Know the difference between top dead center and incorrectly assuming top dead center when the engine is 180 degrees off TDC? There's only one TDC in 720 degrees of crankshaft rotation when intake and exhaust valves are closed.

2-If timing is correct then a compression test should verify valves weren't bent and stuck. Squirt a tablespoon of oil into each cylinder thru the spark plug hole, remove the fuel pump fuse to prevent engine flooding and have someone start the engine while you use a compression gauge to measure each cylinder's compression. If a compression gauge, borrowed from Autozone, has a hose extension and gauge that locks the needle with a one way valve similar to tire pressure gauges, compression testing can be a one man job. Expect around 185 psi per cylinder.

3-If you replaced the engine/powertrain control module, security will turn on and flash indicating a theft attempt as Passlock disables injector operation. A 30 minute Passlock relearn procedure is needed to sync the engine module to the body control module containing the Passlock program. Passlock in the bcm controls whether the engine module's injector program. Search for the relearn procedure or put the original engine module back without performing the relearn procedure. With Saturns, you cannot just simply assume replacing an engine control module or body control module without performing a relearn procedure. Relearn is GMs technical description for marrying one module to another as they exchange a password bit to one another. GM dealers with their scantool performs it in 10 minutes. Without their scantool, we have to perform it in 30 minutes.

If security is flashing during starting, injectors are disabled. Removing spark plugs should show dry plugs otherwise the plugs should be soaking wet from several starting attempts.

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