Of o2 sensors, bad wire, and a leak-down test...

Will I Am · 2004-06-19T19:59:42+00:00

I have a '96 Mustang GT convertible, with the 4.6 V8 sohc.The 'Check Engine' light came on for the first time last Friday whilemy wife and I were on vacation. Nothing was amiss, just the light.Gas cap was tight, everything under the hood 'looked' alright.About 30 miles/minutes later, the 'Sputter' started. At first the carwould hesitate at idle, but clear up under hard acceleration.But now, it is steadily getting worse.Ran a code reader through it, "Misfire on Cyl 1" it read.New plugs, new wires, and a new front o2 sensor did NOT cure theproblem. One of the plug wires was bad, though it did not cure theproblem.New left-bank coil, and a new injector did NOT cure the problem.Leakdown test was performed, and a noticeable noise is heard in theintake (also lack of compression on that cylinder)My question is thus: Does this sound like a burnt/bent valve, and ifyes, why does it not occur under heavy acceleration?I am new to this group, old to toher newsgroups, and would appreciateany information, ideas, or formulations...William

Jun 19, 2004 21 Replies

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<memset 22 years ago

No. The revised intake manifold I was speaking of was specifically for 96-98 cars (V8 SOHC only, IIRC). But... 99+ intake manifolds don't HAVE this problem in the first place.. lol.

-Mike

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Will I Am 22 years ago

wrote the following, which while being attributed to fact was none the less being challenged::

Ok, so basically what is going to happen is this:

I've found a set of heads, PI's, rebuilt and assembled for $400. I'm going to find that 99+ manifold, and hope it's under $200. Then after collecting various other parts, I'm going to stuff it all down in under the hood, shake well, and see what transpires. ;)

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