CYL 1,2,3,4 no fire - Hemi Truck Club
 
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Old 12-09-2018, 04:40 PM   #1
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CYL 1,2,3,4 no fire

Hello all, long time no see. I have the same 03 Ram 2500 5.7 hemi. I dropped in a new engine, all new sensors, coil packs, and comp. I have traced all wires for grounds, power, and continuity. I have no spark on 1,2,3,4... I have swapped plugs, coil packs and the problem stays. The plugs are white and wet on 1,2,3,4. It has been a ongoing problem for a year now, and I really need this truck. Thanks Any ideas would be great!


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Old 12-09-2018, 06:17 PM   #2
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If you unplug the coils and test for power do you get 12v on 1 pin and ground?

Next get a mood light plug it into the coil plug and start the truck does it flash? If not trace wires checking for pinch, melt, cut especially in passenger rear corner. If that’s all good it’s like a pcm issue.
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Old 12-09-2018, 11:54 PM   #3
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That a odd combination of cylinders not firing. My guess is 12v power wire feeding the coils is broken. This comes from the ASD relay and feeds both ignition and injectors. Test for power when ignition is first turned on. After a few seconds if engine isn't rotating the ASD relay will open and there will be no power.
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Old 12-10-2018, 11:59 AM   #4
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I got 12V but don't see a ground. I don't see a ground on the coils that work either.
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Old 12-10-2018, 04:59 PM   #5
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Won’t see a ground will need the mood light to see it flash or a logic probe with coil plugged in backprobing.
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Old 12-11-2018, 03:50 AM   #6
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The 12v comes in on a harness from the front. The grounds are controlled by the pcm and use a plug (16 pin) at the driverside rear of engine. It is awkward to connect and disconnect. Might check it for bent pins.
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Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

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