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Old 10-08-2013, 04:40 PM
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Pinging or knocking when hot

Yesterday I got off the freeway, and when I took the first turn onto the surface streets the engine started making a pinging/knocking noise right as I turned, and stopped right after. I drove down the road a ways and it came back for a little bit while I was accelerating uphill. It came back for a little bit once again when I was turning for the last time onto the street I live on. Oil pressure is about 9 psi hot idle and I know it isn't great and I'm praying it isn't rod knock and just pinging from carbon buildup or something, but I've never had a car that did either so I don't know what either sounds like from inside the car. Thanks guys.
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Old 10-08-2013, 05:07 PM
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I can't even describe just what pinging/detonation sounds like, it's like a clattering sound when accelerating, not the same as the deeper clunk of something in the crank.

What was your engine temp when you got off the highway? How is your ignition timing setup, how much advance and are you using ported or manifold vacuum advance?
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Old 10-08-2013, 05:30 PM
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To be honest I haven't touched any of that since I got the jeep. It's all stock, I know that much. The temps are okay, It has a 180 degree thermostat so it runs a bit cooler than normal anyways.
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Old 10-08-2013, 05:37 PM
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pinging aka detonation
sounds like marbles in a coffee can
think low oil pressure and valvetrain noise on steroids.

BAD gas will do it, just fill up recently?
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Old 10-08-2013, 05:55 PM
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It sounded kind of like a diesel type clatter but only on one cylinder or something. I filled up about a week ago.
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Old 10-08-2013, 06:54 PM
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yup

That is clatter sounds like cheap gas or the distributor is too advanced.
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Old 10-08-2013, 07:38 PM
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Take a standard claw carpenter's hammer and bash it rapidly against concrete. That's what detonation sounds like.

Check the EGR.
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Old 10-08-2013, 08:46 PM
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Run down the tank and fill up with quality fuel. Maybe run some techron or similar to decarb the motor. Seafoam is an option as well. If that does the trick you're good to go. If not you may need to back off the timing a bit or run higher octane fuel.
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Old 10-08-2013, 09:02 PM
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I managed to get a video after battling it out with all the idiots coming home from work. The sound is right at the beginning, it's not very loud but it's there.

http://www.youtube.com/watch?v=LgohsxxJkCU
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Old 10-09-2013, 06:47 AM
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yeah

Either bad gas advance timing or running too hot. The audio is not definitive to me at least.

The noise I am hearing does sound like pinging. Rod knock is low frequency pinging is high frequency
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If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.

Last edited by serehill : 10-09-2013 at 10:03 AM.
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Old 10-09-2013, 09:47 AM
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It never hurts to check the timing. You can do that and know for sure that your ignition is making the fire at the right time.

Rod knock sounds alot like a gorrilla sitting in your engine bay and pounding on the firewall. It isn't subtle and if that were it you would have pulled over the first time you heard it not kept driving.

I agree on putting some good gas in it but check the timing too.
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Old 10-09-2013, 10:32 AM
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video isn't any help too much background noise

get one with the engine warmed up and idling, and under load like in gear w/ your foot on brake

Sounds like you have multiple issues.
Do you have a bad exhaust leak?
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Old 10-09-2013, 10:41 AM
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No, but the speedometer makes a weird noise for some reason, that might be what you're hearing.
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Old 10-09-2013, 10:44 AM
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@ any rate get a better vid, or swing by a local engine rebuild shop they'll tell you what you're hearing.
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Old 10-09-2013, 12:15 PM
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Quote:
Originally Posted by Miraphone186
No, but the speedometer makes a weird noise for some reason, that might be what you're hearing.
Very god point. Sometimes the speedometer cable can make a rattling noise that sounds a lot like ping.
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Old 10-09-2013, 02:43 PM
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I just put in Shell 89 and a couple bottles of that techron stuff, I'll see how it runs tonight on my way home. I have a sneaking suspicion that it's carbon that's to blame because I mostly do city driving anyways.
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Old 10-09-2013, 02:59 PM
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Sheesh man, quit looking for silver bullets and throw a timing light on it. 5 min job.
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Old 10-09-2013, 03:14 PM
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I would if I had one. I'll go buy one right now.
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Old 10-09-2013, 03:47 PM
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Not trying to be an asshat but guess so far you don't even do your own tune ups. If you plan to in the future and maintain your vehicle a light should be in your toolbox. Kinda basic tool. If maint isn't your thing, pay a shop or get a neighbor to help. I'm assuming since you're asking for help here you plan to fix it rather than pay a shop so you need some minimum basic tools. Trust me you'll use them again. Again not trying to be a Richard Head here but when diagnosing a perceived problem always check the obvious easy stuff before guessing and throwing money/parts at it. As you're learning fixing is the easy part, diagnostics is the hard part. You don't need $10,000 worth of trick Snap-on fluff, just basic tools. You'll figure it out in time keep at it.
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Old 10-09-2013, 04:14 PM
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Quote:
Originally Posted by joe
Not trying to be an asshat but guess so far you don't even do your own tune ups. If you plan to in the future and maintain your vehicle a light should be in your toolbox. Kinda basic tool. If maint isn't your thing, pay a shop or get a neighbor to help. I'm assuming since you're asking for help here you plan to fix it rather than pay a shop so you need some minimum basic tools. Trust me you'll use them again. Again not trying to be a Richard Head here but when diagnosing a perceived problem always check the obvious easy stuff before guessing and throwing money/parts at it. As you're learning fixing is the easy part, diagnostics is the hard part. You don't need $10,000 worth of trick Snap-on fluff, just basic tools. You'll figure it out in time keep at it.

7.5/10 somewhat patronizing but accurate. Mother nature decided to rain so I think it's gonna have to wait for today.
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