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  #1  
Old 04-25-2010, 10:37 PM
Travis Travis is offline
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Default popping through exhaust??? need help

Hey guys,
I have a 99 dodge ram 1500 5.2 auto. I am about ready to tow the truck to a junk yard....I got the truck and it had a spun rod bearing, but other than the knocking, the engine ran fine, and still had good power. I already had another engine for the truck when I got it. I put this engine in, and upon being started, the engine started to backfire. The problem was the #2 cylinder. When the spark plug wire was taken off it would stop. I figured this was a stuck valve since the engine had been sitting for a while...fast forward to today....I purchased another engine for the truck, put new spark plugs, plug wires, distributor cap, rotor button, and intake and valve cover gaskets on. To my surprise, when the truck was started it started to backfire through the exhaust again, and again the #2 cylinder is the problem. I have changed the coil, and injector on that cylinder, and this didn't change anything. With all of the other new parts, I am out of ideas on what to even try now. The number 2 cylinder is getting spark to it, but when the spark plug wire is removed, the popping out of the exhaust stops. Any ideas of what it could be, or at least something to check? I am out of ideas....
Thanks,
Travis
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Old 04-25-2010, 10:57 PM
Travis Travis is offline
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Also wanted to add that there aren't any lights on in the dash, and the truck idles really well. Does not sure on the RPM's and they stay steady.
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Old 04-27-2010, 03:43 PM
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Have you checked the valve springs? Cam lobe wear? Compression/leakdown?
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Old 04-27-2010, 10:05 PM
kevin amer kevin amer is offline
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could be a burnt valve but a compression test would show some sign a cyl leakdown test would show best. to do this put the suspect cyl on compression stroke at the highest point apply a air charge into cyl but only light pressure approx 5 psi check for hiss noise from intake area this indicate burnt intake valve hiss from exhaust indicates exhaust valve problem hiss from oil cap or dipstick indicates bad rings good luck
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Old 04-29-2010, 08:19 AM
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5 psi? I've never done a leakdown at less than 100 psi unless it was on a 2 stroke engine. Also, air bubbles in the cooling system indicate a leak into the cooling system.
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