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Old 01-11-2013, 04:30 PM   #1
zodszoo
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Default Flooded Engine - Fuel Rail & Injectors Problem?

'96 SC2 DOHC will not start. Pulled up plugs and a ton of gas inside. Recently replaced CPS, ETCS, and the Fuel Filter. I have 42psi fuel pressure with key on. Injector Problem? I've also recalled seeing somewhere on here about a fuel regulator built into the fuel filter. I bought mine from Advance Auto, Fram version I think. Could that be a problem

Thanks for the assist folks.
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Old 01-11-2013, 04:51 PM   #2
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Default Re: Flooded Engine - Fuel Rail & Injectors Problem?

The filter/regulator combination came after '96. Your regulator should be on the fuel rail. Have you checked for spark by removing the wires from the two coils and watching for sparks across the towers while an assistant cranks the engine?

If you have spark and the engine is flooding, replace the ECTS (engine coolant temperature sensor) and check/clean the connector. Also inspect the wiring to the sensor for poor splices by previous owners and repair any found with a proper solder and heat shrink joint. When the ECTS fails, the system can dump way too much fuel on a cold start, flooding the engine.
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Old 01-11-2013, 05:19 PM   #3
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Default Re: Flooded Engine - Fuel Rail & Injectors Problem?

With plugs removed from flooding, you can perform a spark test after blowing out excess fuel from cylinders using the starter for a few seconds. Pull the pcm B+ fuse to prevent any spark from igniting raw fuel being blown out then replace the fuse for a spark test.
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Old 01-11-2013, 05:27 PM   #4
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Default Re: Flooded Engine - Fuel Rail & Injectors Problem?

I'll get a new ECTS. There is a splice in the wire connector, looks "iffy." I will redo the connector with solder to get make sure of a good connection. Also, is this a typical connector that can be purchased new anywhere?
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Old 01-11-2013, 05:32 PM   #5
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Default Re: Flooded Engine - Fuel Rail & Injectors Problem?

I would not call the connector "typical", but have read that you can buy these at a computer supply store. Most members just cut one off from the IAT sensor on a junkyard car.
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Old 01-11-2013, 05:35 PM   #6
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Default Re: Flooded Engine - Fuel Rail & Injectors Problem?

If the coolant sensor was replaced before, then just remove it to be sure its the flat nosed brass one. Connectors aren't easily found anywhere except junk yards and from some members. The air temperature connector is the same if you find one in a junk yard. PC connectors have the same spacing and can be used along with silicone sealer.

Check to be sure the connector is clean and free of corrosion; any slight dirt or oxidation that prevents good electrical connections simply raises the resistance value along with the coolant sensor value on cold starts that equates to the pcm seeing a frozen engine and responding with more fuel than necessary. This can lead to flooding and hard starting if plugs, wires, and ignition system aren't operating perfectly in cold wet weather.
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Old 01-11-2013, 05:36 PM   #7
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Default Re: Flooded Engine - Fuel Rail & Injectors Problem?

Quote:
Originally Posted by zodszoo View Post
is this a typical connector that can be purchased new anywhere?
Sadly, no. You might be able to order one from a GM dealer, but your best bet is to get one from a junkyard. The same sensor is used for intake and and transmission temperature, so there are plenty of connectors available on a parts car: the IAT connector is the easiest to access, and unlike the ECTS connector, it's not likely to be corroded from coolant leaking through a failed ECTS.

In a pinch, a two-pin connector from many computer motherboards (wires that go to the front panel for switches, lights, etc) will fit and work fine, temporarily, but they are not sealed from the environment, so corrosion will be a problem (it will work until you get to the junkyard, though).

You could use the computer connector, and seal it with RTV, but you probably wouldn't be able to disconnect it again (you would need to cut the wires, to remove the sensor), so it could make future repairs much more of a headache.
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