5.7 engine knocking - JeepForum.com
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post #1 of 9 Old 11-04-2012, 08:38 AM Thread Starter
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5.7 engine knocking

anyone experience a pretty hefty engine knocking in the cold weather with the 5.7 hemi? Ive noticed it a few time since its started to get cold in the mornings here. It threw the check engine light last time it did it so took it to a place with a code reader and nothing came up. suggestions?

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post #2 of 9 Old 11-05-2012, 09:54 AM
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Bad gas maybe? I haven't had any problems but I have heard that they knock sometimes. Try filling up at a different gas station and see if the problem continues.
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post #3 of 9 Old 11-06-2012, 07:42 PM Thread Starter
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It only happens when i first start it up in the mornings to warm up and by the time im back out to my car (no more than 5 minutes later) it has stopped. it almost sounds like it could be misfiring
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post #4 of 9 Old 11-08-2012, 02:04 AM
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Could be lifters?
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post #5 of 9 Old 11-08-2012, 07:48 PM Thread Starter
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well the code that tripped the check engine light was a misfire on cylinder 1, so i replaced all 16 plugs with hopes that they were the root of the knocking. to my dismay the knocking still happened this morning. I think if it were the lifters it would be more of a constant tick rather than an irregular knocking that occurs for only a few minutes while its warming up.
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post #6 of 9 Old 11-09-2012, 08:49 AM
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May seem like a dumb question but you checked the oil right?!?

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post #7 of 9 Old 11-09-2012, 09:03 AM Thread Starter
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06JeepXKHEMI not a dumb question. yes, oil was the first thing i checked. it was within the operating range but i added a bit just to make sure it had plenty.
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post #8 of 9 Old 11-09-2012, 09:10 AM
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kinda sounds like a collapsing lifter..

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post #9 of 9 Old 11-09-2012, 02:29 PM
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I see you checked the oil, but is it the correct weight....5W-20? Have you cleared the DTC? Has it returned? Do you regularly change your oil, or do you let it slide way past the change intervals?

The No. 1 cylinder is an MDS cylinder, and there have been reports of the MDS lifter actuating pin(s) failing and causing an engage/disengage problem. This usually causes an initial intermittant problem that progresses into a continuous problem. There have been some writeups, with pictures, on at least one of these forums. If you can't come up with anything conclusive, you may want to do a search and see if you can come up with one of them. IIRC, one that had the problem was going ~10,000K between oil changes. Did that cause it???? Who knows? Guess it could keep the pin(s) from moving as freely as the should, especially if running dino. oil that long.

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5.7 liter , cold start , grand cherokee , knocking

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