timing issue ????
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Joined: Jan 2013
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timing issue ????
Hey guys a im having an issue with my 1998 dodge ram 1500 4x4 with a 5.2L in it
i shut it off the other day no problems or weird sounds, when to start it 6 hours later and just rolled over wouldnt kick or nothing so i changed the coil, distributer, still nothing so i changed the crank sensor and finally got some noise out of it some progression i thought ! turns out my intake it forcing air through, (out of intake) and my exahust is sucking air in ??? could my timing chain have jumpped a couple teeth or is it something much simpler lol, if anyone has any input that might help would be greatly appriciated thanks
i shut it off the other day no problems or weird sounds, when to start it 6 hours later and just rolled over wouldnt kick or nothing so i changed the coil, distributer, still nothing so i changed the crank sensor and finally got some noise out of it some progression i thought ! turns out my intake it forcing air through, (out of intake) and my exahust is sucking air in ??? could my timing chain have jumpped a couple teeth or is it something much simpler lol, if anyone has any input that might help would be greatly appriciated thanks
Grand Champion
Joined: Apr 2010
Posts: 5,011
Likes: 6
From: Meeker, CO
It's time to jack up the radiator cap and put a new truck under it.
But seriously now: If you are absolutely certain that the engine is pumping air backward the first step is to disable the ignition and take off the valve covers to ensure that the entire valve train is going round and round and up and down like it should. If the front rockers go up and down but some in the rear don't, your cam came untogether and you're going deep next.
If the valve train seems to be going round and round and up and down as it should, tear open the front of the engine to get at the timing chain and gears. Consult the manual, check the gear synchronization. If it's out of whack, fix it.
If the valve train seems to be going round and round and up and down as it should, and the timing gears are properly synchronized, compression test each cylinder to find that ones that are making zero compression or close to it.
If the valve train all goes round and round and up and down, and the timing gears are properly aligned, and you've got something significantly greater than zero compression in all cylinders, then you were not absolutely certain that the engine was pumping air backward and you've just wasted a lot of time, some of it mine. Knowhuddamean? Be damn certain.
But seriously now: If you are absolutely certain that the engine is pumping air backward the first step is to disable the ignition and take off the valve covers to ensure that the entire valve train is going round and round and up and down like it should. If the front rockers go up and down but some in the rear don't, your cam came untogether and you're going deep next.
If the valve train seems to be going round and round and up and down as it should, tear open the front of the engine to get at the timing chain and gears. Consult the manual, check the gear synchronization. If it's out of whack, fix it.
If the valve train seems to be going round and round and up and down as it should, and the timing gears are properly synchronized, compression test each cylinder to find that ones that are making zero compression or close to it.
If the valve train all goes round and round and up and down, and the timing gears are properly aligned, and you've got something significantly greater than zero compression in all cylinders, then you were not absolutely certain that the engine was pumping air backward and you've just wasted a lot of time, some of it mine. Knowhuddamean? Be damn certain.
Last edited by UnregisteredUser; Jan 8, 2013 at 07:08 PM. Reason: I R eduntant. Or at least I was.
All Star
Joined: Jan 2009
Posts: 907
Likes: 2
From: Corrales, New Mecico
Ignition timing is controlled by the PCM. Injector firing (fuel sync) is controlled by the distributor.
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