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Old 08-30-2014, 09:52 AM   #1
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Default What is the best way to crank over the engine w/o firing up

have an impala 3.4L need to crank over the engine w/o firing up
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Old 08-30-2014, 10:42 AM   #2
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you can find the fuse for the ecm or fuel pump, or mark your spark plug wires and take them off the coil terminals, or disconnect the big long plug from the ICM/coil module. last one is likely the easiest to put back together

Last edited by jwfirebird; 08-30-2014 at 10:44 AM.
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Old 08-30-2014, 01:31 PM   #3
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Disconnect the injector harness connector located near the alternator.
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Old 08-30-2014, 02:40 PM   #4
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two wire plug on the passenger side of the ICM(power and ground)......
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Old 08-30-2014, 07:59 PM   #5
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Easier way. Hold the accelerator all the way down to the floor while cranking. This is called "clear flood mode".
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Old 08-30-2014, 08:00 PM   #6
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My ICM is one big plug, but the power and ground is on the left, not sure how the plug on the 3.4 is, I'd just loosen the bolt to the ICM wiring connector, and remove the plug from the ICM.
What are you trying to do, a compression test?
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Old 08-30-2014, 10:14 PM   #7
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William, there are three plug/harnesses on a 3.4 ICM....two on the driver'* side.....one on the passenger side(power and ground harness)....just pull that one off......just a click retainer.....
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Old 08-30-2014, 10:38 PM   #8
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Quote:
Originally Posted by Mike1995 View Post
Easier way. Hold the accelerator all the way down to the floor while cranking. This is called "clear flood mode".
What ya'll getting tools out for? Or nobody reading?
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Old 08-30-2014, 10:57 PM   #9
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Just mainly trying to figure out what his reason for wanting to crank it over without it starting is, if it is to do a compression test, I don't think he'* going to be trying to enter clear flood mode while testing each cylinder.
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Old 08-30-2014, 11:36 PM   #10
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I was curious why as well? Unplugging the icm is a one way, but would be a risk of flooding the engine with raw fuel.

Last edited by chevy82; 08-30-2014 at 11:38 PM.
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