Last post on Jan 09, 2010 at 8:24 PM
You are in the Lincoln LS
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Lincoln LS, Engine, Sedan
#1 of 13 04 V6 LS vibrates at idle, knocks under load and smells funny :)
Jan 06, 2010 (7:48 am)
My 04 LS with 48K (bought it at 33K in July 08) has always had a random "odor" that occurs only at low speed/stopped while it was warm. Kind of a burning odor, but not oil. I let it go, car has an extended warranty. Recetnly, the car has started vibrating at idle. Not "shaking" but like the whole car is a cell phone on vibrate mode. Only does it at idle, but its been getting more pronounced. I can stop it by keeping my foot on the brake and feathering in some throttle to get the RPMs up over about 900. It also knocks/rattles under load in the upper gears (or its never in 1st long enough for me to notice). Ford dealer called the knock "spark knock", said it wasnt covered under my extended warranty as a "maintainence issue" (note-fidelity warranties are not what they are cracked up to be) and wanted near a grand to replace all COP's and plugs and flush the fuel system. Didnt check on the smell and the vibrating started after that. Had a CEL flash at me once, got it checked as "misfire in #6 in the first 1000 RPMS" (which one is 6?)
I pulled the 3 easy coils and looked for scorch marks, cracks, oil in the wells-nothing. Didnt pull the plugs, might try that. Dont really want to pull the intake unless i have to.
Anythoughts on any of it? related?
#2 of 13 Re: 04 V6 LS vibrates at idle, knocks under load and smells funny :) [branflake12]
Jan 06, 2010 (8:51 am)
Was there any oil in the plug wells? If so change the valve cover gaskets and you'll probably need to change the COPs at some point anyway. That's the most likely culprit. At least you'd want to rule those out first.
#3 of 13 RE: Oil in the wells
Jan 06, 2010 (8:58 am)
they were actually all 3 clean. I was expecting oil, but they looked near new.
#4 of 13 RE: Oil in the wells [branflake12]
Jan 06, 2010 (10:46 am)
I thought they had fixed the VC gaskets by the 2004 models but wasn't sure. That doesn't mean the COPs aren't going bad though.
Jan 06, 2010 (12:26 pm)
Ill have to re-check them and take a hard look at the boot, maybe spark is getting thru there. Any chance its just a bad plug(s)? The COP's all looked fine to my untrained eye, but that doesnt mean much.
#6 of 13 Re: COP's [branflake12]
Jan 06, 2010 (12:35 pm)
They fail internally. They don't look bad and they may even test OK. You really have to test them individually under load. Plugs are a possibility and easy enough to change.
Jan 07, 2010 (9:53 am)
Would a bad coil(s) explain both the vibration AND the missing/chatter under load? I was considering a PCV valve at fault for the vibration. The burning smell however...I can't theorize on. Thanks!
#8 of 13 RE: COPs [branflake12]
Jan 07, 2010 (3:55 pm)
It will cause a misfire so yes. Wouldn't hurt to change the PCV valve though - if you have one - one of the engines doesn't use one but I'm not sure which one. Check the OM. I think the V8 doesn't use one.
Jan 08, 2010 (3:34 pm)
Yeah the V6 has the PCV. I bet it's not the plugs, probably COPS.
#10 of 13 RE: COPs [toomanyfumes]
Jan 09, 2010 (11:59 am)
I had a misfire #6 spark plug, I replaced it.then # 5 had a misfire. I replaced all 6 cop's and spark plugs. still runs bad. the mechanic said it was the # 3 so he swithched the cop's and plugs around and it worked for a day...took it back and he said it was the cat. convertors. I replaced both passenger and drivers side and the FOUR 02 sensors upper and lower...he also replaced the fuel filter...now it shows a #2 misfire and he said he doesn't want to work on it any more and has done all he can do...any ideas?