Intake valve sticking

Mar 23, 2008 2 Replies
R

I have a 95 Ford Aerostar with a 3.0 engine I just replaced both cylinder heads. after I got the engine back together , and started the engine I noticed right off that it was backfiring through the intake manifold. after shorting out a couple cylinders determined it was the number five that was the culprit . Now I checked the heads out as well as the valves and appear to fine so all I can come up with is the valve is sticking . Now my question is what can I do to get it to unstick ?



Thanks in advance for any and all advice.



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S

Pull the cover and see if it is valve train related or if it's the valve itself. Could be a lifter that stuck or a bad spring. Or it could be a bent stem.

Only way to find out is to look.

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W

Just a thing, One way to look is with a timing light, watching the rocker and valve action. The sticking has a reason, you have to determine why before you develope a plan to fix it. There are several possibilities that come to mind off the bat.

1-bent valve stem 2-insuficient stem to guide clearance 3-lack of lubrication

Or the valve is just not sealing. A vacuum guage could come in handy, the symptom also suggests a flat camshaft lobe.

wws

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