5.3 swap doesn't want to start
10-26-2018, 11:33 PM
#1
Staging Lane
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5.3 swap doesn't want to start Right after the swap the car actually started and ran decent. Now after starting and moving the car, untuned, a few times, it doesn't want to start anymore. Cranks over and sometimes chugs like its going to start, but nothing. Weird thing is, i smell gas, but can't find a leak.
10-27-2018, 12:24 AM
#2
TECH Senior Member
Something might have worked loose. Check all connections and grounds, and any chafed wires.
10-27-2018, 05:57 AM
#3
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Without a good tune, you could have ran rich and fouled your spark plugs. You smell gas . . . I'd at least look at the condition of the plugs. If a black, conductive film is across the internal white porcelain, your spark energy crosses the easier conductive path there and not at the normal gap.
Rick
Rick
10-27-2018, 07:40 AM
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10-27-2018, 08:02 PM
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Without a good tune, you could have ran rich and fouled your spark plugs. You smell gas . . . I'd at least look at the condition of the plugs. If a black, conductive film is across the internal white porcelain, your spark energy crosses the easier conductive path there and not at the normal gap.
Rick
Rick
10-27-2018, 08:06 PM
#6
All you do in a flood situation is hold the throttle wide open while cranking. The PCM will go into flood mode and hold the throttle wide open and dial back the fuel. If the car still doesn’t want to start after a few seconds of this, I’d look into spark issues like cam and crank position sensors.
10-27-2018, 08:06 PM
#7
Staging Lane
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I do know fuel is going into the fuel rails but I'll have to get a fuel pressure gauge and see what it's at, btw do you guys know what the pressure is suppose to be around?
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10-27-2018, 08:09 PM
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All you do in a flood situation is hold the throttle wide open while cranking. The PCM will go into flood mode and hold the throttle wide open and dial back the fuel. If the car still doesn’t want to start after a few seconds of this, I’d look into spark issues like cam and crank position sensors.
10-27-2018, 08:32 PM
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10-28-2018, 09:28 PM
#12
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All you do in a flood situation is hold the throttle wide open while cranking. The PCM will go into flood mode and hold the throttle wide open and dial back the fuel. If the car still doesn’t want to start after a few seconds of this, I’d look into spark issues like cam and crank position sensors.
11-09-2018, 01:24 PM
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So I forgot to mention that I dont have a MAF sensor on the intake, jus a filter on the tb, its temporary, unless this is what's causing it th o not want to start. I pulled a few codes from the computer, ill post them.
