V-6 overheated, now running rough

[graeaglecrawler]

My truck was driven almost dry without water now the rear cylinder on the drivers side is not producing pwoer. T the plug looks good and is getting spark but the engine is missing. I pulled the plug wires while the the tuck is running and that cyl. is the one that has no change on the rough Idle. I tried swithing plugs with no effect. Any ideas?

 

[the_dingman]

Probably a blown head gasket. The 3VZE is known for HG issues, especially after an overheat.

What does the plug look like? You can tell a lot from the condition of the plug.

 

[graeaglecrawler]

The plug looks pristine, it's that good. Where is the compression going? the cylinder next door is producing power, could the valve have tightened up? There is no water in the oil or oil in the water. The valve cover on that side is easy to remove can I adjust that valve?

 

[mikedks]

Dude, no water?, where did it go?

Dude, head gasket. do the compression test. gauge will cost you 40 bucks at Sears, do it.

 

[graeaglecrawler]

There was a small leak , its my daughter's vehicle, I had to leave for two days and guess what. I will buy a comp. checker next. I want to hear from people that have adjusted the valves on the v-6 or some other ideas b-4 I pull the heads.

 

[TxUrbanRunner]

 

[the_dingman]

Don't buy a compression tester. Autozone borrows them out.

 

[Hyde802]

Dont do this. Fix it right.

 

[TxUrbanRunner]

A grand to fix it right or 35 to fix it on the cheap. If its been hot enough to get rid of a head gasket then it needs a complete over haul. Putting new head gaskets on a motor that's been hot enough to blow a gasket will for certain use oil. Been a mechanic for 30 years and I know what happens. Seen many customers come in and say put head gasket on. All of them used oiled within six months of doing so. Just my two cents not starting anything im just pointing out the fact of what has been done in the past. My local Toyota dealer will not do the head gasket special service on the 3vze due to them using oil after head gasket change,

 

[TxUrbanRunner]

Not to mention I did the exact thing on a 85 4x4 farm feed truck with a 3vze that blew a had gasket over a year ago with the above product and its still running and idles most of its life. Owner said don't fix it crush it. Farm hand went and bought above product and I did put it in and it still runs to this day without any other issues.

 

[graeaglecrawler]

I don't have any evidence of anything on my plugs, where does this fart of comprssion go into the crankcase? Why if I'm getting spark and gas and the spark fires on compression don't I hear or see any evidence of the gasket blown?

 

[GonOvr]

As mentioned get a compression tester, either borrow or buy. Thread it into the spark plug hole and then crank it over. It should be somewhere around 150psi.

Same thing happened to me. I burnt the exhaust valve on #4 cyl. and all the cyl. compression was going out the exhaust. I said screw it and added 2 more cylinders.

Could be a burnt valve, blown head gasket, gremlins, hole in piston, bad rings.

Head gaskets can also be minor where compression can escape through the head gasket but coolant wont enter the cylinder.

Remove radiator cap (when engine is cold) and fire it up. If you see bubbles continuously coming to the fill hole, you have a a blown head gasket.

 

[crawyota]

dont do this. Fix it right.

x2 don't buy this crap