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96' Ram 1500 5.2 Wont Start

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Old 07-15-2011, 09:16 PM
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Default 96' Ram 1500 5.2 Wont Start

So I bought a non running 1996 Ram 1500, 4x4 5.2L and I just can't seem to get it started. Changed the cap and rotor, plugs, and IAC valve. The struck will start up if it's been sitting for a couple hours but I have to hold it at WOT for it to just idle at 1000 rpms which it very roughly holds. I checked the firing order on the cap and its all correct. I got the po505 code when I put my scanner on it. If I let it stall it's real hard to get it fired right back up. I checked compression, 120psi all around. Checked fuel pressure at the rail, 45psi. and did the old spark check test. Got spark on all 8 wires. My next idea was to take out the throttle body and clean the IAC passages. I love playing with someone elses headaches haha Anybody have any ideas?
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Old 07-16-2011, 08:19 PM
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Bump.
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Old 07-16-2011, 10:14 PM
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That 505 code is an indication that the PCM is seeing a short to ground or a short to voltage in the idle control motor wiring circuit.You already changed the IAC, so it could be wiring, or heaven forbid a bad IAC. I have had to return parts many times until I found one that would work. I would def clean the mess out of the TB, make sure the passage is clear. Also check this out http://dodgeforum.com/forum/2nd-gen-...um-thread.html
I have seen a completely blocked cat cause the same problem. If the plenum is blown and has been driven for a long time that could def be the problem.

EDIT: Is this the same problem you were having when you bought the truck, or would it not run at all then?
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Old 07-17-2011, 10:24 AM
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Truck hasnt ran since i bought it, lk I said I love coming up behind other ppls problems haha. I did spray the crap outta the throttle body with 2+2 and it didnt budge an ounce. I did read somewhere a clogged cat could cause this to so I'm going to take the pre cat o2 sensor out and see what happens. Hopefully it works.
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Old 07-17-2011, 11:23 AM
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Pull the O2 sensor (pre cat) and see if it fires. If it's a plugged cat the removal of the sensor can help it releive the back pressure.

I do not think it's exhaust causing this problem, I would guess it's a lack of fuel since you have to keep on the throttle to keep it running. When it doesnt want to start, try having a assistant tryt to start it and see if you can spray some starting fluid in the throttle body and see if it wants to start. Be carefull...

I have also used a small amount of gas, very small but that is a little more dangerous and you could flood it causing it to not start at all too.
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Old 07-17-2011, 11:45 AM
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It's getting fuel, like I said it has good fuel pressure, 45 psi. And it doesnt want to start nemore than before when I spray starter fluid in it. I havent put a noid light on it to verify if my injectors are actually working.
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Old 07-17-2011, 01:23 PM
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i would pull the pre cat o2 out and try to start it my 99 had the same issue and mine was a clogged cat and if it is you can get a bolt up magnaflow high flow cat for 216 free shipping just a heads up
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Old 07-17-2011, 06:57 PM
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Well it wasn't the cat. Pulled the pipes off the manifolds(o2 sensor was giving me a fit to come off) Still didnt want to start. I checked the spark again for ****s n gigs and i got yellow spark. I just put a new coil on it so that aint it. My next step is to try changing wires and or the cam pos sensor under the rotor.
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Old 07-17-2011, 10:19 PM
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use a test light, or a noid light, to see if you are getting injector pulse.
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Old 07-18-2011, 02:12 AM
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Yea, thats my next move.
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Old 07-18-2011, 02:12 AM
 
 
 
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5.2 l, iac, po505, ram 1500, wont start

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