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Knocking or ticking sound after the engine is running for a while in cold weather

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  #1  
Old 12-14-2008, 11:24 AM
bluedodgeram bluedodgeram is offline
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Angry Knocking or ticking sound after the engine is running for a while in cold weather

I live up here in cold Canada, and when I start up my truck with the factory car starter, at -1 to -30 degrees celicius, and let it run to warm up, by the time I get to my truck, I can hear a knocking/ticking sound coming from the engine, but then you drive it for a while the sound is gone?????? It doesn't do it at first start up, but after roughly 5 minutes. Does anyone know what this is? and I know it's not piston slap, because I know how that sounds like. Anyone else have that issue, I was also told it is also due to low oil pressure, on a new truck???
It is a 5.7 hemi w/MDS....
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  #2  
Old 12-14-2008, 12:42 PM
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could be a small exhaust leak and then when the motor and everything warms up the metal expands closing off the leak, maybe the doughnut gaskets?
happened in my fathers f-150, he was freaking out thinking his motor was going bad and turned out to be a exhaust manifold leak, which went away when his motor warmed up.

could also be lifters tapping? maybe try some lucas oil stabalizer, stuff works great imo.

have you tried listening for the noise with the hood up and maybe get underneath the truck and try to pinpoint where the noise is coming from.

good luck
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Old 12-14-2008, 12:51 PM
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DON'T Put the Lucas in a 06-up hemi. It is way too thick for the MDS and will cause problems.
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Old 12-14-2008, 03:18 PM
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mine does it too when its cold out. mine sounds more like lifters.
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Old 12-14-2008, 03:57 PM
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I've been noticing it on startup, too. It sounds *almost* like a compressor belt running, or something, but I don't have the AC on. I've got a Flowmaster series 50 exhaust on it that's about three years old, so I was also thinking it could be the exhaust starting to go bad. From my experience, Flowmasters only last a couple of years, so I wouldn't be surprised if that was the case. Sometimes it seems like it's coming from the back, but I'm pretty sure the noise is coming from the front, though.
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Old 12-14-2008, 04:00 PM
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What are you running for gas? If it's regular 87, try 89 octane and see if that makes it go away. Your engine might not be so tolerant of the lower octane in the winter blends.
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Old 12-14-2008, 04:06 PM
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I always use mid-grade in my truck religiously, which is 89 everywhere around here.
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Old 12-14-2008, 04:08 PM
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I recomend running a good synthetic oil. It makes alot of noises quieter. Run 89 oct gas.
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Old 12-14-2008, 04:21 PM
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Mobil 1 5/20 always since after break in.
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Old 12-14-2008, 06:03 PM
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Thanks guys for the help, I appreciate it. I'll try running 89 octane in her to see if it stops the noise, I checked for a exhaust leaks, and everything is fine, I could not find any leaks at all. Do you guys know when is the break-in period with these hemi's? I heard it's around 100 000 kms's. Is it?
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Old 12-14-2008, 06:04 PM
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+1 on synthetic oil.
and lucas oil stabliazer is guarenteed not to mess anything up in any engine or void any warrenties or they will pay to fix/replace it. but ive never heard that it shouldnt be put it in a hemi. better safe than sorry i guess.
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Old 12-17-2008, 09:38 PM
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I actually started to notice the "pinging" noise after I changed to a full synthetic oil. I have a 04 Hemi with 40,000k on the odometer. What else could it possibly be?
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Old 12-26-2008, 08:21 AM
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the 4.7 are quieter engines the 5.7 is louder of the two, my friend has a brand new 08 hemi, my 05 4.7 with 37000 on it is still quieter than his.
Also have to make sure you are using the right weight oil, IT WILL MAKE A BIG DIFFERENCE. Also dodge uses hypurectic Pistons that actual have a very small amount of "looseness" to them when first cranked up. I have had absolutely no mechanical problems with my pick-up, and iam so happy i dont have the MDS, so many of my friends are now after some time are starting to have problems just like gm did with the cadilaac 8-6-4. Merry christmas to all and happy new year
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Old 12-26-2008, 08:57 AM
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The Hemi has a noticeable sound that is referred to as the "Hemi Tick". I've had it from day one, June 2004, and to date have had no engine issues whatsoever. My truck came with 3 year/36k mile of free oil changes every 3k miles. I took advantage of it for the first year (about 18k miles - due to a divorce it was the only period that my truck was also my daily driver). Started doing the changes myself at 21k miles and went to Mobil 1 and noticed the "tick" got a tad quieter. After about two and a half years and 15k miles of Mobil 1, I switched to Royal Purple (and 6k change intervals) about a year ago. First two things I noticed with the RP was that it smoothed out the engine at idle a good bit, and although still there, the tick is noticeably quieter still.

Oh and Popps: I'm curious to know what "problems" these friends of yours are having with MDS Hemi's. Like you, I'm not a fan of MDS at all, and it's why when I finally trade up, it'll (hopefully) be to a CTD, but if the cash is not there, then at least a SFA 2500 with the non-MDS Hemi in it. I buy an 8 cyl. truck, I want my 8 cyls. ALL THE TIME!
But that said, I've not heard of ANY issues regarding MDS in my circles. I belong to about five Hemi and/or Dodge related forums, one of my regular golf partners is a Dodge service mgr. and I frequently "hang" at a local Mopar performance shop. I've seen nor heard of any issues directly related to MDS, short of the annoying sound it makes with aftermarket exhausts, which of course has nothing to do with the way it performs...

Last edited by HammerZ71; 12-26-2008 at 02:38 PM..
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Old 12-26-2008, 09:14 AM
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I occasionally here the same low end knocking in mine a few minutes after start up while sitting and idling. This seems to be normal from what I have heard and read. My 03 Monte Carlo did the same thing as do most GM vehicles. Its in the design. My MC had 140,000 on it and I never had a engine related problem. I drove that car very hard too. Dont worry about it with my RAM. LIFETIME POWER TRAIN WARRANTY. I will keep my foot in it. It's a HEMI. BTW I use RP and high quality 91-93 octane fuel.
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Last edited by Scorpio_08_HEMI; 12-26-2008 at 09:16 AM..
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Old 12-26-2008, 10:50 AM
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I have had the annoying Tick in my Hemi since about 400 miles. I have 2600 miles now on my '08 and it's still there with Mobil 1. I have my MDS turned off with my Diablo Predator and it has nothing to do with the tick.
The tick is due to too much clearance in the valve guides. the valve is what's making the noise.
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Old 12-26-2008, 02:29 PM
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Cool. Good to know it's pretty normal with the 5.7. I can't say it HASN'T been doing it since I got it new, but I'm just now noticing it.
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Old 12-26-2008, 02:29 PM
 
 
 
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2006, 57, changing, cherokee, dodge, grand, hemi, jeep, knocking, noise, oil, purple, roal, royal, synthetic, tick

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