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While driving check engine light turned on?

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You need to have it diaged properly to determine the exact failure. From the looks of your codes, the cat converter has an issue, the intake air sensor has an issue and there is most likely a vacuum leak for the 171.

Roy
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
JLANC20
  • MEMBER
  • 3 POSTS
  • 2003 MITSUBISHI ECLIPSE
  • 4 CYL
  • 2WD
  • MANUAL
  • 86,000 MILES
I recently installed a set of headers on my car. The car runs perfectly fine but the CEL came up a day after I installed them. The code said warm up catalyst below threshold. It looked as if my stock headers had a catalytic converter on them but I am not sure. I know there is one underneath my car. I was wondering if this could be my problem and if im hurting anything by still driving it. I erased the code today and it hasnt come back up yet. I was also wondering what I could do to fix this, ive seen that you can buy o2 sensor spacers to raise the rear sensor out of the exhaust flow. Please give me your opinion. Thank you
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
If the light comes back on then get me the code number so I can look it up. I would say it does come back on you may need to replace the rear O2.
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
JLANC20
  • MEMBER
  • 3 POSTS
It came back on today.I was wondering if you would know if my car had two catalytic converters.I know it has one and the stock exhaust looks like it has one as well. The new header I put on doesnt have one so wouldnt that throw things off? The exhaust would only be goin through one converter instead of two. Because I never had this problem until I recently put those headers on.I have the o2 sensor spacer coming. It doesnt do harm to the car running with the that light on does it?
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok this no different then when I put the cat back system on my Mustang. It set the light because of having more exhaust flow. It ended up replacing both rear O2 sensors and the light hasn't come back on. So I suspect the same it with you car. You have removed the pre cat that was part of the exhaust manifold, so now the rear O2 sensor is seeing more exhaust flow (lower exhaust temp). You can try the spacer but don't rule out possibly having to replace it ok. As for driving it with the engine light on, no it won't harm it you just won't get the best mpg. If the light comes back on after the spacer please get me the actual code number so I can look into to tell you what may be needed.
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
JLANC20
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  • 3 POSTS
Okay ill do that. How would the new o2 sensor fix it tho im confused because wouldnt it be the same as the one thats in it now? Or did u buy a better one for ur stang? So ur sayin its probable running rich because its sensing there is more o2 in the exhaust. Im hopin the spacer works I just dont know how it would heat it up if its not getting hot enough now being in the exhaust flow. Please reply thanks for the help
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
NBRANDL217
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  • 1 POST
  • 2003 MITSUBISHI ECLIPSE
  • 4 CYL
  • FWD
  • MANUAL
  • 107,000 MILES
I had a cylinder that was misfiring, so I replaced the spark plugs and wires/boots, and my check engin light is still on. Before I replaced these parts a mechanic told me the problem yet after it was fixed the light is still on? I tried to disconnect the battery but the check engine light will not go off, is there any way I can get this light off myself, or will I have to have a professional do it for me?
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
MONTY STEPHENS
  • MEMBER
  • 79 POSTS
You can do it -- I think the erase code function on your code reader may clear it. Some cars you have to turn the ey on, engine not running, then twist the odometer knob.
Its amazing how the dealers won't tell you anyhting about that. They always say "bring it in". Geez, we just want the frickin light off.
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok if the spacer don't fix it then by replacing it you are giving it a fresh sensor. The new sensor will work on a wider band therefore correcting what it thinks is wrong. I bought stock ones for my Stang but they worked on a wider band therefore light out. Make any sense? If not just ask away. Let me know how the spacer works.
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2003 MITSUBISHI ECLIPSE
  • 160,000 MILES
My 2003 eclipse has had a vibrating problem for a while now. Its recently gotten worse (last 75,000 miles) and the check engine light just turned on a few days ago. I have almost 160,000 miles on it and I drive about 100 miles per weekday. Wen the vibrating first started, I took the car to two mechanics and neither could find anything wrong. One told me this is normal for a sports car, but it just seems to be getting worse.
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
DRCRANKNWRENCH
  • MECHANIC
  • 3,380 POSTS
More than likely the motor mounts are bad. When you replace them, you have to replace all of them and the transmission mount at the same time. If you don't the new mount will get damamged by carrying the load of the engine that the failed or failing engine mounts cannot support.
If the check engine light is on have the trouble codes pulled. Any Auto Zone or Advance Atuo will do this for free.
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Monday, August 3rd, 2020 AT 2:46 PM (Merged)
Tiny
DUB COLLUMS
  • MEMBER
  • 3 POSTS
  • 2002 MITSUBISHI ECLIPSE
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
Car was running fine and one day I went in the store and came out and it would not start, acted like it was out of gas but it was not. After changing spark plugs, draining gas and adding new gas, throttle position sensor, camshaft sensor, ignition coil, new battery and replacing a fuse that had blown, the car finally started again but only to shut off when put in drive or reverse or when the A/C was turned on. Was told to check the mass air flow sensor, I disconnected it and the car shut off so I then removed the air idle control position and cleaned it and the car fired up and I drove it, but it was rough and loud sounding, not idling right at all, hesitant on accelerating and did not act like it knew to change gears or something. Had a kind of mist to it anyway, tried several times and it started consistent with same issues. Went to start it a minute ago and it will crank but no start. While running it made a couple popping sounds like a backfire from the motor. Any suggestions? Also, check engine light is one and give code for o2 sensor heat bank 1.
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
HI and thanks for using 2CarPros. Com.

I need to know what code was actually set. Can you provide that for me? I need to know if it a circuit issue, lean code, rich. Also, can you tell me if you have checked fuel pump pressure?

Thanks,
Joe
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)
Tiny
DUB COLLUMS
  • MEMBER
  • 3 POSTS
Fuel pump pressure seems to be fine and in the pic is code it threw.
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Welcome back.

That code tells me the sensor is not heating. I will tell you that there is a fuse that can blow as well as the sensor itself can go bad. However, that will not prevent the engine from running. Worst case, bad gas mileage.

With that in mind, since it will not start now, check to make sure the engine is getting spark and fuel. Even though there is fuel pressure, the injectors may not be firing due to an electrical issue or even a bad cam sensor.

Here is a link which shows how to check for spark:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Here is a link which shows how to check that the injectors are working:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Do these two things and let me know what you find. Also, engine timing may be an issue here if the belt jumped. Let me know about the spark and fuel first and if it checks good, we will need to do a compression test.

https://www.2carpros.com/articles/how-to-test-engine-compression

This is an interference engine, so a broken or jumped timing belt may be an issue.

Let me know what you find or if you have other questions.

Joe
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)
Tiny
DUB COLLUMS
  • MEMBER
  • 3 POSTS
Thank you very much. I will do those test tomorrow. But today it started right up and stays running and is drivable so would timing be a issue? I mean it still has all the other problems though.
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)
Tiny
PITBULL_1983
  • MEMBER
  • 1 POST
  • 2002 MITSUBISHI ECLIPSE
Computer problem
2002 Mitsubishi Eclipse 6 cyl Front Wheel Drive Automatic

hello, my name is alexander, I have a mitsubishi eclipse gt-v6, its a 2002.

I recently had some repair/replacement work done to my vehicle.

Needed new radiator and thermostat

as I was driving away to go about enjoying the rest of the day, all of a sudden the SERVICE ENGINE SOON light came on. I thought that was kind of odd that had occured.
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis, finding out what's going on.
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi again. If it is running good, then no to the timing. However, if it happens again, check the injectors as well as for spark when it will not start. A quick and easy way is to see if it starts with starting fluid. If it does for a couple seconds, then it is fuel related. If it does not, chances are there is no spark. Keep in mind, the only time to run the tests is when it refuses to start.

Let me know what happens or if you need anything.

Take care,
Joe
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)
Tiny
TAPADGET
  • MEMBER
  • 1 POST
  • 2002 MITSUBISHI ECLIPSE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
What would cause my check engine light to come on the car is not running bad or making any noises
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Monday, August 3rd, 2020 AT 2:47 PM (Merged)

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