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Old 03-01-2012, 11:50 AM   #11
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All gaskets are new. Upper plenum, lower intake, head, and exhaust.
There has been plenty of kicking, screaming, and cussing.
The damn thing runs great off an idle though. Getting very frustrated.
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Old 03-01-2012, 11:55 AM   #12
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Swap your #4 injector with your #3 injector and see if the misfire follows it over.
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Old 03-01-2012, 11:56 AM   #13
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i wonder if the cat/ exh. is got a bunch of coolant in it backing stuff up, that will cause a misfire same as if the cat was bad.
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Old 03-01-2012, 11:57 AM   #14
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Quote:
Originally Posted by Mike1995 View Post
Swap your #4 injector with your #3 injector and see if the misfire follows it over.
If the misfire stays, swap your coil packs around and test again.
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Old 03-01-2012, 12:06 PM   #15
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During my first troubleshooting, I bought a new coil pack, and injector. The problem was still there.
Do you think that Bars leaks crap is possibly clogging my cat?
No apparent restrictions off an idle though.
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Old 03-01-2012, 12:07 PM   #16
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How would I check the cat?
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Old 03-01-2012, 12:09 PM   #17
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You would have to pretty much dump that stuff directly into the cat to clog it up. So, I don't think its related.

Can you inspect your EGR tube for cracks? I've heard this can cause misfires also.
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Old 03-01-2012, 12:13 PM   #18
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I just had it off yesterday and did not see anything wrong. I cleaned it out with cab cleaner also. I am getting a slight leak on the exit flex tubing where it mounts to the egr bracket though. I cleaned the mounting surfaces real good, but still leaks a bit.
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Old 03-01-2012, 12:15 PM   #19
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Like I said earlier about the bars leaks, when I dumped it in and ran the car, it disappeared real quick, and the car exhaust sounded plumb full of coolant. Heard gurgling from the exhaust. Wouldn't the dealer have picked up on that though by catching a convertor code?
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Old 03-01-2012, 12:23 PM   #20
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Get that leak fixed.

It is possible to check for a clogged cat using an exhaust back pressure tester. I see them listed EVEN at Walmart for $39. It plugs into the O2 sensor ports upstream and downstream.
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