(Tulip) Valve
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Joined: Oct 2005
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(Tulip) Valve
Hello everyone, I have a 99' E250, 5.4L with 75,000 miles on it, the #1 cyl. intake valve was stretched and caused it to (tulip) and misfire. Has anyone seen this and what would cause it? A bad fuel injector to cause a lean condition and get hot? I have never seen this before, any info. would be appreciated!
Senior User
Joined: Oct 2008
Posts: 179
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From: Goose Creek, SC
I've seen and heard of them but not on a 5.4 and not at 75K miles. I've seen it on 5.0's, some older 4.6's, and a few bikes. The cars had more than 100K on them and the bikes just weren't adjusted when they were supposed to be. A low quality steel used for the valve, hardened seats with a lot of high rpm's, and power adders can all cause it. I would ask to see the valve itself and the valve seat in the head.
Hotshot
Joined: Jan 2002
Posts: 17,988
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From: La La Land
Tulip'd tips I've seen. Stretched stems I haven't.
Was the stem diameter significantly reduced as a result?
Pop
Was the stem diameter significantly reduced as a result?
Pop
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I have seen it on a few trucks at the dealership most where drivin for some time while skipping or hauling heavy loads while skipping most are commercial vehicles and mileage does not matter. I would stress test the coils probably had a coil go bad and they kept running it. The coils can breakup and not feel like a skip but still be skipping. The ford ids scanner can diag easier than an after market scanner.
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Joined: Sep 2007
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I was a Chev tech for 8 years and I saw this a lot on all of their motors. I saw it on intakes and exhaust. I just chalked it up to crap valves. Mostly late '80s early '90s vintage. It looks just like it sounds, kind of like an inside out umbrella only not as extreme. I don't think a bad coil would cause it. The carbon was most likely from the misfire in that cylinder due to the lack of compression.