79jasper
Chickenhawk
My FIL has a 96 f150 with the 4.6 Triton. It's hardly ever driven anywhere. Maybe 100 miles a month, if that.
I believe it over heated a few times, then started having a cylinder 1 misfire. I read the common problem was a leaky intake gasket, so he "thought" it'd be a good idea to run some stop leak. Well problem persists and IIUC, still uses a little coolant.
Today we pulled the plugs to replace and do a compression check. Well the Triton uses a special adapter to do a CT, which wasn't included in his cheapo freight test kit.
So I pushed a piece of hose down in the plug hole and had him crank it over. It would only pull a vacuum on my finger, no pressure out at all.
I compared it to the next cylinder which would actually push out some pressure.
The plug in that cylinder was brand new, put in like last week. It was already covered in black from inclompletely burned fuel.
With it running I could pull the plug wire with absolutely no change in idle.
No blowby either.
So it definitely seems to be a valve problem.
I'm not too familiar with the OHC Tritons. Do they have lifters?
How are their valves actuated?
I could see a cam lobe through the oil cap, looked to have some wear going on.
Any ideas?
I believe it over heated a few times, then started having a cylinder 1 misfire. I read the common problem was a leaky intake gasket, so he "thought" it'd be a good idea to run some stop leak. Well problem persists and IIUC, still uses a little coolant.
Today we pulled the plugs to replace and do a compression check. Well the Triton uses a special adapter to do a CT, which wasn't included in his cheapo freight test kit.
So I pushed a piece of hose down in the plug hole and had him crank it over. It would only pull a vacuum on my finger, no pressure out at all.
I compared it to the next cylinder which would actually push out some pressure.
The plug in that cylinder was brand new, put in like last week. It was already covered in black from inclompletely burned fuel.
With it running I could pull the plug wire with absolutely no change in idle.
No blowby either.
So it definitely seems to be a valve problem.
I'm not too familiar with the OHC Tritons. Do they have lifters?
How are their valves actuated?
I could see a cam lobe through the oil cap, looked to have some wear going on.
Any ideas?