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Old 07-19-2010, 11:18 AM
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help with 360 magnum

Motor sounds like its detonating, but only starting at 2100 to 2400 rpm (hot and cold). Changed plugs, wires, caps, rotor, air filter, serviced injectors, ran sea foam in oil and fuel.

Anyone have any ideas on where else to check? The problem started after water was in the oil (bad off roading decision), but there isn't any other signs of problems. No Service engine light, nothing came back at the dealership when id taken it to them, however I know it is different then the way it was before.

Engine has the following mods.
Intake manifold (efi)
Throtle body
Cold air intake
Truck cam (can't remember duration but power band is 1200-4800)
9.3:1 pistons
Shorty headers, 3inch single exhaust w/ flowmaster super 44.
Rebuilt 16k miles ago.
2300 rpm stall, built transmission, rebuilt np242.
front and rear lockers, 4:56 gears.

Anyone have any advice on what else I should check? The computer is tuned for the parts installed, only thing I can think of now is timing, what sould initial be set at and what advanced?

Thanks for the help everyone,
Eric

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Old 07-19-2010, 11:28 AM
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Check it for vacuum leaks. Back off on the timing 2 degrees and test drive, repeat to see if the problem goes away.
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Old 07-19-2010, 12:14 PM
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No timing adjustment is availiable on these engines. Turning the dizzy adjusts injector sync. The intake plenum floor pan gasket leaking can cause these type of symptoms.
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Old 07-19-2010, 02:15 PM
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how wouldn't there be timing adjustments? It has distributor. Even if it changes when the injectors fire it that would change the timing of the spark and fuel in regards to the location of the pistons and valces. Anyone have any other thoughts?

Eric
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Old 07-19-2010, 05:08 PM
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Fella, I used to work for Chrysler. You can crank that dizzy all you want, but the PCM will compensate for the movement. The timing will remain the same. Turning the dizzy only affects the injector sync.



From Dodge TechConnect dealer service site:

Quote:
Fuel system synchronization is controlled by the position of the distributor. Rotating of the distributor WILL NOT change ignition timing, but will change fuel system synchronization. Synchronization should be checked whenever the ditsributor is turned or removed. DO NOT ATTEMPT TO ADJUST IGNITION TIMING BY ROTATING THE DISTRIBUTOR.
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