smg1986 Posted February 27, 2011 Share Posted February 27, 2011 ok so I'm driving today and hit a railroad crossing not too softly. After the bump throttle body starts popping like crazy and severe power loss. I pulled the #4 plug out and the TB quit backfiring. What could this be? new plugs and wires. Also new cap and rotor. I'm stuck and can't drive on 3 cylinders. Please help. Link to comment Share on other sites More sharing options...
smg1986 Posted February 27, 2011 Author Share Posted February 27, 2011 its an 1986 with the 2.5l Link to comment Share on other sites More sharing options...
alleydog Posted February 27, 2011 Share Posted February 27, 2011 Sounds like the intake valve is leaking a little or the exhaust valve isnt opening. I would pull the valve cover off and see if you have a broken valve spring or if a pushrod is bent or something like that. Good luck, mark Link to comment Share on other sites More sharing options...
mjeff87 Posted February 27, 2011 Share Posted February 27, 2011 check to see if one of the rocker arm bolts has loosened and the rocker arm has slipped off the top of the pushrod. Jeff Link to comment Share on other sites More sharing options...
smg1986 Posted February 27, 2011 Author Share Posted February 27, 2011 that's what i was thinking. I'll be taking off valve cover today. Hope i can find the problem. If nothing else I'll fix my leaky gasket Link to comment Share on other sites More sharing options...
smg1986 Posted February 27, 2011 Author Share Posted February 27, 2011 i got the cover off and the last push rod is loose i can push the rocker off the spring by hand and spin the rod. Now what? Link to comment Share on other sites More sharing options...
smg1986 Posted February 27, 2011 Author Share Posted February 27, 2011 i can push down on the rod and move it. None of the others do this. I'm lost. Not hugely knowledgeable about valves should i shop it or go it alone Link to comment Share on other sites More sharing options...
mjeff87 Posted February 27, 2011 Share Posted February 27, 2011 depends on where on the cam lobe the lifter is sitting...if it's not on the ramp (not being compressed) it's normal to have a bit of looseness (but you shouldn't be able to swing the rocker off of the pushrod). Try tightening the pivot bolt, then move that cylinder to the intake stroke and check it, it should be solid. If not, you can pull the lifter out of the head, clean it, prime it and reinstall it. See what that does, then we can go from there if that doesn't work. Jeff Link to comment Share on other sites More sharing options...
JeffN Posted February 27, 2011 Share Posted February 27, 2011 first off since you can take the pushrod out, do so and roll it across a known flat surface like a pane of glass, if it has any wobble in it it will need replaced. Also look at another rocker arm that you can twirl the pushrod with your finger showing it is on the closed valve orientation. compare the height of the spring with that one with the one that is loose, that should tell you if you have a stuck valve on the one giving you the problem. Link to comment Share on other sites More sharing options...
smg1986 Posted February 27, 2011 Author Share Posted February 27, 2011 what can be done about a stuck valve? this was all caused by a bump i hit. how can i get the valve out or unstuck Link to comment Share on other sites More sharing options...
JeffN Posted February 27, 2011 Share Posted February 27, 2011 that is something that would be difficult to unstick with the head on the block. taking a rubber mallet and tapping on it with the rocker off could loosen the keeps and the spring would go flying. I have the equipment to air up the cylinder with compressed air and then I would use a valve spring compressor to take the spring off. Then i would soak the valve with some sort of carbon remover like seafoam and hook a battery operated drill to the valve stem and slowly rotate the valve with the drill and work it up and down. (take the air pressure off the valve once the drill has been hooked up). Once it was loose fill the cylinder with air and unhook the drill and re-assemble the spring and rocker arm. Then i would run a can of seafoam in the oil and drive it. Honestly it would prob be in your best interest to have a certified mechanic handle it. Link to comment Share on other sites More sharing options...
smg1986 Posted February 28, 2011 Author Share Posted February 28, 2011 I don't have a problem removing the head I'm just wondering if its cost effective to do a valve job or buy a 300 dollar 4.0 and swap. The swap being done by someone else. The swap is out of my league. Link to comment Share on other sites More sharing options...
cz777 Posted March 1, 2011 Share Posted March 1, 2011 check to see if one of the rocker arm bolts has loosened and the rocker arm has slipped off the top of the pushrod. Jeff 2nd this call ! take off the valve cover and look at springs ,arms ... also if all is good looking ,do a compression test on all with this look at the plugs see any damage ? if ouch ! Link to comment Share on other sites More sharing options...
smg1986 Posted March 3, 2011 Author Share Posted March 3, 2011 Fixed! well for now. Put a new lifter in. the old one had a hole in it. I know cam should be replaced but its just one lifter. Cam did look fine though. All is well for now until the cam goes! Link to comment Share on other sites More sharing options...
cz777 Posted March 4, 2011 Share Posted March 4, 2011 great to hear this ! keep the old timers running !! Link to comment Share on other sites More sharing options...
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