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Old 09-23-2015, 06:45 PM   #1
gambmj
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Default 99 Saturn SL2 DOHC Won't start after rebuild

I just finished rebuilding this engine: machine shop specd and cleaned the head. It had a bad valve on number 3, and we had the shop just re-seat the old valves

Put it all back together with all new gaskets and timing kit.

Primed the engine with oil. When I try to start it, it junk cranks and sounds like it's going to turn over any second, but won't. When I press the gas, it makes a small "chugging" pr popping sound. I have good spark on all four plugs, and I hear the fuel pump engaging and smell traces of gas.
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Old 09-23-2015, 08:38 PM   #2
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Default Re: 99 Saturn SL2 DOHC Won't start after rebuild

Goback to square one and check your valve timing - compression test before this would be rec'd.
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Old 09-23-2015, 10:01 PM   #3
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Default Re: 99 Saturn SL2 DOHC Won't start after rebuild

Was the original coolant sensor replaced with the improved flat nosed brass one? The originals cracked and tended to run engines rich, flood at start up and cause more problems you can find searching past threads. A flooded engine is usually cleared by holding the pedal to the floor for wide open throttle starting; this tells the pcm to shut off injectors during starting and should result in a sputtering start up. This is a normal routine after several failed starting attempts and not an excuse to avoid checking for a faulty coolant sensor (round nosed plastic type). If the engine is flooded, removing spark plugs should show and smell of fuel.
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Old 09-24-2015, 01:59 AM   #4
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Default Re: 99 Saturn SL2 DOHC Won't start after rebuild

Check spark-plug wires for correct order (sequence). It seems like it would be hard to get those so wrong, with them being only long enough to reach the proper plug, but it is any easy check to do.
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Old 09-24-2015, 10:04 AM   #5
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Default Re: 99 Saturn SL2 DOHC Won't start after rebuild

Sounds like the valve timing was incorrectly set.
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