do MILs completely throw c/e light?
Thread Starter
1st Gear Member
Joined: Apr 2007
Posts: 110
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do MILs completely throw c/e light?
Something feels funny with my car, usually from 0-30 or 40 mph and it's much more noticable if you're taking offgoing up a hill from a dead stop. From 0 to 30ish I feel an odd shaking coming from the engine bay ... RPMs are still climbing perfectly fine and other than this shaking feeling, it doesn't seem like a huge ordeal ... however sometimes when I start it, right as the engine cuts on you can feel a buck in the engine bay, like a jump... because of that, I was going to say it almost feels like a miotor mount going badso I had them checked out, along with the tranny mounts and u-joints and nothing is loose... everything is in snug and every mechanic I've taken it to can't diagnose what the problem is. [/align][/align]What I'm wondering is could it be a coil going bad? Or possibly the spark plugs? Because I mainly feel this shaking coming from the right side of the car and my buddy lives on a really steep driveway, and when I tried to pull up it tonight, the car almost died from a lack of power. However the c/e light hasn't come on and I've got MIL eliminators on my x-pipe ... would those throw the c/e light all together or only like 420 codes and whatnot? [/align][/align]Any help you can give me is appreciated cause this problem started weeks ago and it's gotten worse over time. Note, I NEVER feel it at highway speed .. like 60-70+ mph I don't feel anything at all ...[/align]
5th Gear Member
Joined: Nov 2006
Posts: 3,080
From: Bay Minette Alabama
RE: do MILs completely throw c/e light?
When the cats are taken off you put the MIL's on the two rear o2 sensors to keep the c/e light from coming on. All they do is tell the computer what it want's to see so the light doesn't come on so that wouldn't cause your car to run bad at all. You may want to double check your two front o2 sensors and make sure there pluged in good and not on the exhaust or anything. If the front sensors aren't working right it'll cause a big lack of power off the line.
Thread Starter
1st Gear Member
Joined: Apr 2007
Posts: 110
From:
RE: do MILs completely throw c/e light?
Thanks. I appreciate the advice, I'm gonna check that out, but what I was actually wondering was would the MIL eliminators cause the computer to hear what it wants ONLY in the case of a cat issue, or if something else happened to go wrong with the motor, would the MILs completely throw the code so that it'll never come on at all, cat related issue or not?
3rd Gear Member
Joined: Apr 2007
Posts: 881
From: ATL
RE: do MILs completely throw c/e light?
I think what he is trying to ask, and I am curious about this too, will the CEL still work for other engine related issues or do the MIL eliminators completely disable the CEL just to avoid it going off for the cats?
Joined: Apr 2007
Posts: 27
From:
RE: do MILs completely throw c/e light?
ORIGINAL: 97snakebite
Something feels funny with my car, usually from 0-30 or 40 mph and it's much more noticable if you're taking offgoing up a hill from a dead stop. From 0 to 30ish I feel an odd shaking coming from the engine bay ... RPMs are still climbing perfectly fine and other than this shaking feeling, it doesn't seem like a huge ordeal ... however sometimes when I start it, right as the engine cuts on you can feel a buck in the engine bay, like a jump... because of that, I was going to say it almost feels like a miotor mount going badso I had them checked out, along with the tranny mounts and u-joints and nothing is loose... everything is in snug and every mechanic I've taken it to can't diagnose what the problem is. [/align][/align]What I'm wondering is could it be a coil going bad? Or possibly the spark plugs? Because I mainly feel this shaking coming from the right side of the car and my buddy lives on a really steep driveway, and when I tried to pull up it tonight, the car almost died from a lack of power. However the c/e light hasn't come on and I've got MIL eliminators on my x-pipe ... would those throw the c/e light all together or only like 420 codes and whatnot? [/align][/align]Any help you can give me is appreciated cause this problem started weeks ago and it's gotten worse over time. Note, I NEVER feel it at highway speed .. like 60-70+ mph I don't feel anything at all ...[/align]
Something feels funny with my car, usually from 0-30 or 40 mph and it's much more noticable if you're taking offgoing up a hill from a dead stop. From 0 to 30ish I feel an odd shaking coming from the engine bay ... RPMs are still climbing perfectly fine and other than this shaking feeling, it doesn't seem like a huge ordeal ... however sometimes when I start it, right as the engine cuts on you can feel a buck in the engine bay, like a jump... because of that, I was going to say it almost feels like a miotor mount going badso I had them checked out, along with the tranny mounts and u-joints and nothing is loose... everything is in snug and every mechanic I've taken it to can't diagnose what the problem is. [/align][/align]What I'm wondering is could it be a coil going bad? Or possibly the spark plugs? Because I mainly feel this shaking coming from the right side of the car and my buddy lives on a really steep driveway, and when I tried to pull up it tonight, the car almost died from a lack of power. However the c/e light hasn't come on and I've got MIL eliminators on my x-pipe ... would those throw the c/e light all together or only like 420 codes and whatnot? [/align][/align]Any help you can give me is appreciated cause this problem started weeks ago and it's gotten worse over time. Note, I NEVER feel it at highway speed .. like 60-70+ mph I don't feel anything at all ...[/align]
Joined: Sep 2007
Posts: 35
From:
RE: do MILs completely throw c/e light?
ORIGINAL: 97snakebite
However the c/e light hasn't come on and I've got MIL eliminators on my x-pipe ... would those throw the c/e light all together or only like 420 codes and whatnot? [/align][/align]Any help you can give me is appreciated cause this problem started weeks ago and it's gotten worse over time. Note, I NEVER feel it at highway speed .. like 60-70+ mph I don't feel anything at all ...[/align]
However the c/e light hasn't come on and I've got MIL eliminators on my x-pipe ... would those throw the c/e light all together or only like 420 codes and whatnot? [/align][/align]Any help you can give me is appreciated cause this problem started weeks ago and it's gotten worse over time. Note, I NEVER feel it at highway speed .. like 60-70+ mph I don't feel anything at all ...[/align]
HOWEVER, that said, NOT ALL performance issues will trip a code or MIL light. With OBDII, the ECU may note a performance problem and set a code, but not trip the light right away. Other times, the problem will not occur long enough or often enough to trip a code or MIL. I've seen cars with a dead hole not trip a misfire code. More than likely your problem does not occur long enough for the ECU to think anything much of it. The MIL is intended for emmissions primarily, and Ford doesn't want folks popping in to the dealer for every little misfire, so it has some flexibility. If it will affect emmisions notably, then it will likely trip the light.
Last of all, are you sure you do not have any clearance issues with your exhaust?I know this sounds dumb, but if the exhaust is touching anything...That might account for the thump and shaking.