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2001 Chrysler 300M Engine Noise: #1167596 01/29/12 03:06 AM 01/29/12 03:06 AM
Joined: Jan 2003 Posts: 8,398 Highland, MI. Sunroofcuda OP master
Sunroofcuda OP master Joined: Jan 2003 Posts: 8,398 Highland, MI.	I posted about this once before, but nobody really seemed to KNOW this symptom - only some speculation. On cold starts only, the 3.5L makes some pretty significant noises, & when you put it in gear or under any load, the noise becomes a racket! After the engine warms up a bit - maybe 5 minutes, the noise seems to almost go away completely. The sound is almost like a heat shield or something rattling or vibrating - it is not a real consistent sound though. I thought it was maybe loose bricks in the catalytic converters - it really sounded like this. I replaced those a couple months ago & it was not them - heck the original cats were fine. The sound seems like it's coming right out of the engine when you listen with the hood up. The last time I posted, one speculation was piston slap. The sound does not sound like it's coming from deep inside the motor & does not sound like a ticking or lifter noise at all. Anybody else ever experience or diagnose this one? (car has around 127,000 on it & runs great!) No Man With A Good Car Needs To Be Justified

Re: 2001 Chrysler 300M Engine Noise: [Re: Sunroofcuda] #1167597 01/29/12 03:11 AM 01/29/12 03:11 AM
Joined: Jan 2003 Posts: 28,068 Irving, TX feets Senior Management
feets Senior Management Joined: Jan 2003 Posts: 28,068 Irving, TX	I haven't got a clue. My Concorde Limited (300M with a trunk) has 98,000 miles and never did anything like that. Have you put it on jack stands and crawled under it to listen for the noise? Try using a solid bar (big screwdriver) held against different things or a piece of tubing held in different areas to listen for the noise. If it's getting loud, you're getting close. BTW... did you do the timing belt and water pump yet? We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon

Re: 2001 Chrysler 300M Engine Noise: [Re: Sunroofcuda] #1167598 01/29/12 04:28 AM 01/29/12 04:28 AM
Joined: Jul 2011 Posts: 817 Eugene, Oregon Secret Chimp super stock
Secret Chimp super stock Joined: Jul 2011 Posts: 817 Eugene, Oregon	Does any part of the exhaust system have bolts with springs? I had a Honda in Ohio that would make weird rattly noises until the exhaust system warmed up and expanded. Fixed by replacing some rusty springs at one of the exhaust flanges. 1967 Dodge Coronet Deluxe station wagon 1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s

Re: 2001 Chrysler 300M Engine Noise: [Re: Secret Chimp] #1167599 01/29/12 04:35 AM 01/29/12 04:35 AM
Joined: Feb 2007 Posts: 612 Nampa, ID None2Slow mopar
None2Slow mopar Joined: Feb 2007 Posts: 612 Nampa, ID	What about an inspection cover on the trans/ engine area? Is there a shim between the trans bellhousing and engine like the SBF use? Flywheel? Your going to have to get it up and under it to take a look.

Re: 2001 Chrysler 300M Engine Noise: [Re: None2Slow] #1167600 01/29/12 09:58 AM 01/29/12 09:58 AM
Joined: Nov 2003 Posts: 654 Westfield, MA R rbrogle super street
rbrogle super street R Joined: Nov 2003 Posts: 654 Westfield, MA	For a change, I can shed some light, and high mileage experience as well. As of yesterday I now have 2 300m's, a 2000 and a 2004 Special. My 2000 is about 90 miles away from hitting 300,000 miles. I also had the tapping noise that you describe at around 140,000 miles. I thought it was an exhaust leak, so I kept driving it until I had time to deal with it. During that time, I never babied the car and ran up close to another 20K on it. It turns out that I had 3 lobes wiped off one of the cams! This was with synthetic oil since I bought it a 33K. I had a good, then unempolyed Mopar mechanic of mine discover this. He ended up replacing the cam (pass. side I think) and all of the combo rockers on that side. The head needed to be pulled to accomplish this. That cured it. The car still runs well (taps somewhat now on startup in the cold) but only uses a quart of Mobil 1 10W30 in about 5000 miles. My only other advice if you do this work would be to use a MOPAR HEAD GASKET. Good luck! Rob '70 Fury III 'vert (GT Clone)was 318 3 on the tree,now 440 automatic '68 300 2 Door HT vinyl/cloth bench '68 Newport Custom 4 Dr. HT, 383/2, FULLY LOADED! '68 New Yorker 4 Door HT, 440/Auto, loaded! 2004 Chrysler 300M Special daily driver

Re: 2001 Chrysler 300M Engine Noise: [Re: Sunroofcuda] #1167601 01/29/12 11:15 AM 01/29/12 11:15 AM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	Never took one of those 3.2-3.5 engines apart that didn't have at least one cam damaged. That can happen on what I used to think were almost perfect little v-6's. I would do as suggested first and poke around real good under, behind, next to engine with a prybar-poor man stethoscope whatever. Don't forget to prey on the funky heat shields at eng mounts too.

Re: 2001 Chrysler 300M Engine Noise: [Re: Sunroofcuda] #1167602 01/29/12 11:57 AM 01/29/12 11:57 AM
Joined: Apr 2004 Posts: 2,415 Connecticut Ron_M top fuel
Ron_M top fuel Joined: Apr 2004 Posts: 2,415 Connecticut	You are not alone with this. My 2000 Concorde with a 1999 300M engine does this. I just tolerate it and let the car warm up before I go. When my mom had her Saturn SOHC, that thing would wrap like crazy upon startup (dealer tech said it was piston slap / tolerances on the bearings) until it warmed up and what did that car in was the horrible bang experienced when the transmission was put into reverse. Drove that car straight to the auto recycler. Common sense is a flower that does not grow in everybody's garden

Re: 2001 Chrysler 300M Engine Noise: [Re: rbrogle] #1167603 01/29/12 10:38 PM 01/29/12 10:38 PM
Joined: Jan 2003 Posts: 8,398 Highland, MI. Sunroofcuda OP master
Sunroofcuda OP master Joined: Jan 2003 Posts: 8,398 Highland, MI.	Quote: For a change, I can shed some light, and high mileage experience as well. As of yesterday I now have 2 300m's, a 2000 and a 2004 Special. My 2000 is about 90 miles away from hitting 300,000 miles. I also had the tapping noise that you describe at around 140,000 miles. I thought it was an exhaust leak, so I kept driving it until I had time to deal with it. During that time, I never babied the car and ran up close to another 20K on it. It turns out that I had 3 lobes wiped off one of the cams! This was with synthetic oil since I bought it a 33K. I had a good, then unempolyed Mopar mechanic of mine discover this. He ended up replacing the cam (pass. side I think) and all of the combo rockers on that side. The head needed to be pulled to accomplish this. That cured it. The car still runs well (taps somewhat now on startup in the cold) but only uses a quart of Mobil 1 10W30 in about 5000 miles. My only other advice if you do this work would be to use a MOPAR HEAD GASKET. Good luck! As far as the water pump & timing belt, this was done at a Dodge dealer when the car had about 90,000 miles on it. The car was a one-owner meticulously maintained car - all service performed at the original Dodge/Chrysler dealer where he bought the car. I don't even take as much preventive care with my own cars as this guy did. Anyway as far as the cam lobe issue, would this only happen when the engine is cold & then go away? I would think if cam lobes were messed-up, the engine would run like crap?? The sound does seem to come out of the top-end of the motor. I'll do a video & post it on YouTube so you can all hear this. Stay tuned for the link. I'll try & do this this evening. My camera does pretty good movies & good sound. No Man With A Good Car Needs To Be Justified

Re: 2001 Chrysler 300M Engine Noise: [Re: Sunroofcuda] #1167604 01/29/12 10:55 PM 01/29/12 10:55 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	The cams I refer to are losing chunks of their lobe surface, but still open the valves. That cannot last a long time like that. And I don't know what cold and warmed up effect could come from them. (incl rocker-roller-lifter combo).You say load is a factor also, so you might want to pull insp cover to at least check torque conv bolts.

Re: 2001 Chrysler 300M Engine Noise: [Re: buildanother] #1167605 01/30/12 10:47 AM 01/30/12 10:47 AM
Joined: Jan 2003 Posts: 1,551 Marion,Indiana S Seth_Jones pro stock
Seth_Jones pro stock S Joined: Jan 2003 Posts: 1,551 Marion,Indiana	My good friend bought my 2000 300m with 40k on the clock and at 60k developed a tapping sound abouve 3000ish RPM.He assumed bad lifters but didn't want to fix it and drove it another 60k.I bought it when he upgraded and drove it probably 3k when I decided to fix the lifters.Keep in mind this thing would get 30mpg for me and buddy said his mileage was always high 20 low 30s.Low and behold the left cam had 3 lobes where the roller on the rocker had machined down the center of the lobes.I put a used cam in it at 108k miles and now the car has over 170k of early 20's young girl driving abuse LOL!Still gets 30 MPG btw. Now to the OP's original question I think my car does the same thing and always has especially in reverse.I think its related to the air box but has never seemd to hurt anything.

Re: 2001 Chrysler 300M Engine Noise: [Re: Seth_Jones] #1167606 01/30/12 03:21 PM 01/30/12 03:21 PM
Joined: Jan 2003 Posts: 8,398 Highland, MI. Sunroofcuda OP master
Sunroofcuda OP master Joined: Jan 2003 Posts: 8,398 Highland, MI.	I took a couple movies of it this morning on cold start with all the racket. I'll get another movie later when my wife gets back when it's warm. Stay tuned. No Man With A Good Car Needs To Be Justified

Re: 2001 Chrysler 300M Engine Noise: [Re: Sunroofcuda] #1167607 01/30/12 03:32 PM 01/30/12 03:32 PM
Joined: Apr 2003 Posts: 3,968 North Riverside IL & Lowell IN GTXKen super gas
GTXKen super gas Joined: Apr 2003 Posts: 3,968 North Riverside IL & Lowell IN	One of my many first gen 3.5 motors had this issue. Turned out to be a worn timing belt tensioner. It would make a terrible rattle until the car was warm. I guess the motor warmed up enough and the tensioner worked ok. I ended up pulling the belt covers off and running the car, you could see that sucker bounce. In hindsight I could have probably found it by using a stethoscope on the cover.

Re: 2001 Chrysler 300M Engine Noise: [Re: GTXKen] #1167608 01/31/12 01:16 AM 01/31/12 01:16 AM
Joined: Jan 2003 Posts: 8,398 Highland, MI. Sunroofcuda OP master
Sunroofcuda OP master Joined: Jan 2003 Posts: 8,398 Highland, MI.	Quote: One of my many first gen 3.5 motors had this issue. Turned out to be a worn timing belt tensioner. It would make a terrible rattle until the car was warm. I guess the motor warmed up enough and the tensioner worked ok. I ended up pulling the belt covers off and running the car, you could see that sucker bounce. In hindsight I could have probably found it by using a stethoscope on the cover. Your description sounds very feasible! An inconsistent RATTLING. I got some good movies of this today. I'll see if my daughter can edit the movies together & get it up on Youtube. How big of a job is it to replace that tensioner? No Man With A Good Car Needs To Be Justified

Re: 2001 Chrysler 300M Engine Noise: [Re: Sunroofcuda] #1167609 01/31/12 02:35 AM 01/31/12 02:35 AM
Joined: Jan 2003 Posts: 8,398 Highland, MI. Sunroofcuda OP master
Sunroofcuda OP master Joined: Jan 2003 Posts: 8,398 Highland, MI.	And here's the movie: http://www.youtube.com/watch?v=qFZ7lfLGo...mp;feature=plcp Let the guesses begin! No Man With A Good Car Needs To Be Justified

Re: 2001 Chrysler 300M Engine Noise: [Re: Sunroofcuda] #1167610 01/31/12 10:45 PM 01/31/12 10:45 PM
Joined: Jan 2003 Posts: 8,398 Highland, MI. Sunroofcuda OP master
Sunroofcuda OP master Joined: Jan 2003 Posts: 8,398 Highland, MI.	BUMP Anybody else with any ideas on this? No Man With A Good Car Needs To Be Justified

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