Clattering sound coming from underneath, forward half, modulates w/ speed
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It sounds like a possible exhaust leak up near the cats. Isn't heard as much up top with the hood open, just when crouched down near the front wheels. The sound is a modest metallic clatter at idle, especially off the line, but modulates with engine speed and goes away at 2500rpm. I'm actually hoping it's something involved with the exhaust, as it seems, to give me a solid excuse to 'repair' (re: modify!) this soon. It's just noticeable enough in the cabin that I'd have to explain it to a passenger (as I did my wife last night), so I'll need to address this sooner than later as it just sounds bad.
Of note, I did briefly see a 'restricted performance' message on the dash for all of 3 seconds last week on a cold startup, but it went away and hasn't come back since. I haven't experienced any loss of power from normal, and all is well otherwise (still driving it nearly daily). Any thoughts?
Of note, I did briefly see a 'restricted performance' message on the dash for all of 3 seconds last week on a cold startup, but it went away and hasn't come back since. I haven't experienced any loss of power from normal, and all is well otherwise (still driving it nearly daily). Any thoughts?
Last edited by Sentinelist; 10-19-2014 at 08:44 AM.
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Hrmmm. May be time to put it up on a lift and check things out next. My handbrake is all but broken already (flacid as... well, a wet noodle since this is a family website), so I wonder if that's the last bit about to go, though it still works. The cats I've been wondering about, as there's no mention of them being replaced yet. I wasn't getting 'pebbles', but perhaps. I'll take another listen tomorrow. Perhaps more credence for the exhaust upgrades...
Last edited by Sentinelist; 10-19-2014 at 11:44 PM.
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Quick update- haven't driven it since! Cranked it up yesterday and it doesn't modulate with the RPMs as much as I thought before. Definitely not. More of an afterthought sound with engine speed, which seems to point to the exhaust. I lightly revved the engine in my garage and it sounds very smooth- the clatter is just strictly under the car. Nothing up top or 'in the middle' that I can tell. I can't imagine this being a brake cable...
I'll try and put it up on jacks and ramps tomorrow and break out the stethoscope, but can anyone recommended a high-flow cat replacement, or regular replacement? If the cats are indeed what this is, I'll plan to put my exhaust plan (err, TBD) into action as well.
I'll try and put it up on jacks and ramps tomorrow and break out the stethoscope, but can anyone recommended a high-flow cat replacement, or regular replacement? If the cats are indeed what this is, I'll plan to put my exhaust plan (err, TBD) into action as well.
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I had a similar metallic sound that we thought was the brake shield lightly nicking the wheel, therefore more and faster with more speed or rpms. However, it turned out to be rear wheel bearing, which won't show up on a lift or just revving engine. You might want to check wheel bearings, front and back.
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Thanks, guys- I'll check all of the above probably this weekend. But I may have gotten confirmation about the cats last night, when the CEL popped on the dash a mile from the house. Here's what I found when I ran the codes a few hours after (cooled down a bit):
P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
P0302 - Cylinder 2 Misfire Detected
P1316 - Misfire Rate Exceeds Emissions
P1111 - System Pass
Odd on the last one, especially considering the glowing CEL on the dash and unlikelyhood of me passing a state inspection now (luckily it did in July!). But what do you guys think? Bad cats and/or O2 sensor? Bad spark plugs?
Strange that the rattle is intermittent- it was indeed back again most of yesterday.
P0430 - Catalyst System Efficiency Below Threshold (Bank 2)
P0302 - Cylinder 2 Misfire Detected
P1316 - Misfire Rate Exceeds Emissions
P1111 - System Pass
Odd on the last one, especially considering the glowing CEL on the dash and unlikelyhood of me passing a state inspection now (luckily it did in July!). But what do you guys think? Bad cats and/or O2 sensor? Bad spark plugs?
Strange that the rattle is intermittent- it was indeed back again most of yesterday.
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This link to my page should help with cylinder numbering
Link http://www.jagrepair.com/images/Auto..._numbering.pdf
Link http://www.jagrepair.com/images/Auto..._numbering.pdf
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Sentinelist (11-25-2014)
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Thanks, Gus. No oil in the valley, coil packs and wiring 'look' OK, and not sure if the plugs are the originals at this mileage or not (131k), but are NGK Iridiums which are OE, IIRC. Just ordered a new set of NGK Iridium IFR5N10s that will be here Wednesday.
The maintenance records stack that came with this car was... nonexistent actually. Just some notes jotted down completed 'recently' without any mileage or datestamps (tensioners were noted!), so I'm still developing a baseline in some areas. More Wednesday night if I can sneak it in before Turkey Day...
Anyway, tackling this first to hopefully to kill the related codes and will then get back to 'the rattle'.
The maintenance records stack that came with this car was... nonexistent actually. Just some notes jotted down completed 'recently' without any mileage or datestamps (tensioners were noted!), so I'm still developing a baseline in some areas. More Wednesday night if I can sneak it in before Turkey Day...
Anyway, tackling this first to hopefully to kill the related codes and will then get back to 'the rattle'.
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1.Fill up with 93 octane and add a bottle of sea foam in the tank.
2.Remove all coils,remove the coil boots, spray the springs clean with electrical contact cleaner, let dry,replace any damaged boots, replace any coils showing damage at the tips of the coil,that the spring goes to.
3.Replace all your spark plugs.
4.Clean the MAF sensor by removing and spraying the electrical contact cleaner above on the metal reader wire that's inside the air box.
5.Replace your air filter,change your oil and filter, hit the highway
2.Remove all coils,remove the coil boots, spray the springs clean with electrical contact cleaner, let dry,replace any damaged boots, replace any coils showing damage at the tips of the coil,that the spring goes to.
3.Replace all your spark plugs.
4.Clean the MAF sensor by removing and spraying the electrical contact cleaner above on the metal reader wire that's inside the air box.
5.Replace your air filter,change your oil and filter, hit the highway
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Sentinelist (11-25-2014)