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  #1  
Old 03-28-2011, 01:52 PM
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Default HELP!!! ECU question/problem

hows it going recently i bought a 96 dodge ram with a blown engine for 1000 got a 5.2L magnum engine out of a 97 ram swapped engines but it wouldnt start for a min then just randomly fired up drove it for a while then one day same problem it would crank and crank but wouldnt fire up then magicly it fixed its self and ran fine until a few days ago now it wont start at all cranks just wont fire

it has spark has compression and is getting fuel i replaced the cps spark plugs ignition coil and cap & rotor sprayed starting fluid did all kinds of tests and nothing which leads me to believe its the computer because my father in law had same year and same problem and ive checked everything else

heres my question. i have a 96 2wd automatic 5.2 magnum with a new engine from a 97 do i get a ecu out of a 97 or does it not matter? should i get one from a junk yard have mine rebuilt or buy a new one? what is the difference in the vin between the 96 and 97 engine? when i did the engine swap i kept the old wiring harness and the only difference was the cps connector was different and the alternator was larger.

any info would greatly help thank you
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Old 03-28-2011, 02:00 PM
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For starters, what are you calling the cps? Crank position? Cam position? You said you have a spark but what about an injector pulse? Have you scanned the PCM for active faults? What's your fuel pressure?
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Old 03-31-2011, 10:32 PM
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i havent checked fuel pressure with like a tool or anything i did purge the fuel rail and gas squirted out and there is a noticeable smell of gas coming out of the exhaust

i havent scanned the pcm i did however used a scanner on it and it wasnt throwing any codes or anything

i didnt think to explain when i said cps lol i meant crank shaft position sensor
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