'94 Ranger 4 cyl warping intake valves - Great Lakes 4x4. The largest offroad forum in the Midwest

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Old June 21st, 2011, 02:54 PM   #1
greenmeanie
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Unhappy '94 Ranger 4 cyl warping intake valves

The machine shop that I have had 2 heads rebuilt at due to the intake valves warping said the engine is combusting too hot.
Anyone have any idea what would cause the engine to combust hot enough to warp 2 sets of valves in less than 300 miles?
The intake gasket is new and the injectors seem to be working fine (someone told me to check these).
Any help would be much appreciated.
Feel free to call me at 231-736-9539 if you want to ask any questions to help diagnose the problem.
Thanks! -Kevin
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Old June 22nd, 2011, 12:31 PM   #2
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WTF is a warped valve? In all my years I have never heard of this.

Was the truck overheating? Was it warping the head itself or killing headgaskets?
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Old June 22nd, 2011, 01:19 PM   #3
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plug gap affects combustion temp.

But I agree, warping valves??? really?
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Old June 22nd, 2011, 06:56 PM   #4
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I call B.S. I am a huge 2.3 turbo guy and have taken bone stock 100k mile motors and stuffed 20+ psi and nitrous through them and never messed up any valves...lots of headgaskets but nothing else.

How about a back ground story on whats goin on with the truck?
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Old June 22nd, 2011, 11:20 PM   #5
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Not sure what kind of rocker/lash adjuster set-up those have but check to make sure the valves aren't being held slightly open when closed. That will overheat the valve and normally burns a hole in them.
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Old June 23rd, 2011, 09:24 AM   #6
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The first time I took the head off due to # s cyl not contributing, the machine shop said the intake valve on # s "tuliped". The second time, the same thing happened, but to cyl # 2
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Old June 23rd, 2011, 09:33 AM   #7
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The s's are 4's; I can't edit for some reason from my phone. The machine shop rebuilt the head for free the second time, so I am wondering if they put bad intake valves in the first time.

The engine is running cool from the gauge, new motorcraft plugs gapped properly.I had bosch plugs before, but those aren't gappable. Any other suggestions?
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