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Check engine light on?

Tiny
QUENTIN24
  • MEMBER
  • 1999 MITSUBISHI ECLIPSE
  • 4 CYL
  • 2WD
  • MANUAL
  • 238,000 MILES
99 mitsubishi eclipse, 2.0, non-turbo, manual transmission, 238,000 miles, have owned it since new and taken very good care of it. Intermittent missing problem. Sometimes the check engine light flashes on and off, but I feel no engine miss at all. Other times it misses badly, but then stops after I pull over. Sometimes the check engine light stays on, other times it does not. I have changed the plugs and wires twice. A shop replaced the coil twice. I was told it might be the ECM. I bought a used ECM and put it in myself, but the problem immediately continued. I've never changed the rings or head gasket. Trying to decide if it's worth it to keep spending money, or bail to a new car. Thanks!
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Tuesday, June 3rd, 2008 AT 9:42 AM

42 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi quentin24,

If the check light flashes, then there should be some code stored in the ECU. Have you done a diagnostic check on it? If none is found, get the diagnostic done after the check flashes without stopping the engine. Some codes are not stored in memory after the ignition is switched off.

This video will help us fix it

https://youtu.be/vMwTzURWXmk

Don't think is anything to do with the rings or head gasket.
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Tuesday, June 3rd, 2008 AT 10:52 AM
Tiny
QUENTIN24
  • MEMBER
  • 3 POSTS
Hi there. Yes, I forgot some information. I have had the codes checked, and it has generically pointed to misfiring on cylinder 3. My mechanic did some wire switching to make sure it wasn't a plug or wire, but the second occurence was also cylinder 3. At this point, he was fairly convinced it was the ECM because of how good the car ran when it was "not" missing. Also, he was driving it during one of the "cel flashing" episodes, and concluded that at that moment the car was running perfect - not missing at all. Of course, at other times it does miss - badly.

I should also mention that about 8 months ago, or slightly more, I had an O2 sensor fail and replaced it. That one was properly diagnosed with the engine light code.
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Tuesday, June 3rd, 2008 AT 11:20 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi quentin24,

Since it is an intermittent problem, The ECU could be faulty but a loose or insecure wire connector or internally broken wires can cause the problem.
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Wednesday, June 4th, 2008 AT 8:48 AM
Tiny
QUENTIN24
  • MEMBER
  • 3 POSTS
Thank you. Since I've already replaced the ECU, I guess it's on to the wires now? I'm, unfortunately, very inexperienced in this area. Am I right in saying that I'd need to replace the wiring harness next? Is this a job that a semi-amateur like myself could attempt? Am I even saying any of this correctly? :)

thanks!
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Wednesday, June 4th, 2008 AT 4:16 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Hi quentin24,

It is not necessary to have the whole harness replaced unless you can see bad damages at many places.

Since the misfiring is from the 3rd cyliinder, then you need to check the wire from the ECU to the coil.

If you understand the basic principles of electrical circuit, it is possible to DIY but might be quite tedious.

Just start from the coil and check backwards to the ECM.

Having a wiring diagram would be much easier.
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Thursday, June 5th, 2008 AT 6:20 AM
Tiny
ALLIERAYE
  • MEMBER
  • 1 POST
  • 1999 MITSUBISHI ECLIPSE
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100,100 MILES
My 'service engine soon' light came on a couple days ago. Nothing is different with my car and it's driving the exact same as before. How to re-set my 'service engine soon' light? If the light comes back on again after I reset, my plan is to then take my car in to get it checked out.
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Monday, August 3rd, 2020 AT 2:52 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
You can disconnect the battery for 10 minutes and restart it and see if it goes away.
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Monday, August 3rd, 2020 AT 2:52 PM (Merged)
Tiny
4G63WITBIG16G
  • MEMBER
  • 3 POSTS
Did u try to pull codes?
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Monday, August 3rd, 2020 AT 2:52 PM (Merged)
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
He dont want to pull the codes. Just wants it reset to see if they come back. Could have been a random occurance.
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Monday, August 3rd, 2020 AT 2:52 PM (Merged)
Tiny
FANTASIA
  • MEMBER
  • 2 POSTS
  • 1999 MITSUBISHI ECLIPSE
  • 4 CYL
  • FWD
  • MANUAL
  • 140,000 MILES
After the check engine light has been cleared and the problem fixed, If I ran another scan on it, will the check engine light that provides the trouble codes tell me everything I had once already fixed?

I have already changed the fuel pump, fuel filter and relay but my car still dies after a minute of running. It dies as if the fuel has been cut off, like ni pressure is behind it. The only thing I have been able to come up with is it could possibly be the fuel pressure regulartor. AM I correct or could there be something else that I am over looking?
Thank You
Barbara
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Monday, August 3rd, 2020 AT 2:52 PM (Merged)
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
Hi Barbara,

What were the codes you got?

Once you fix a problem and clear the codes they shouldn't come back. Unless there is a problem with something else on the circuit.

You should go ahead and check the fuel pressure and regulator.

.
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Monday, August 3rd, 2020 AT 2:53 PM (Merged)
Tiny
MANDY353
  • MEMBER
  • 1 POST
  • 1999 MITSUBISHI ECLIPSE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 135,000 MILES
I have a 1999 eclipse with 135000 miles on it that I recently puchased. I was told the solenoid needs to be replaced. The car will not go and faster then 30mph and will shift up to 2nd gear it seems like but will not shift after that. Also when I start the car there is a loud knocking noise and the car seems to have a hard time when starting it and again the noise is heard when shutting the car off. The check engine light is on, The car does not seem to over heat (ive only driven it once). I'm not sure what these problems are. I know that the car needs new belts, alignment and a radiator fan. If someone could give me an idea of what these problems might be id REALLY apreciate it. & Maybe an estimate of how much theyd be to fix. Thanks
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Monday, August 3rd, 2020 AT 2:53 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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-1
Monday, August 3rd, 2020 AT 2:53 PM (Merged)
Tiny
COWBOY41
  • MEMBER
  • 1 POST
  • 1999 MITSUBISHI ECLIPSE
  • 4 CYL
  • FWD
  • MANUAL
I have a 99 eclispe it starts just fine but is idiling a little rough and the service engine soon light came on I used a obd2 reader and it says bank one is running to rich how do I fix it?
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Monday, August 3rd, 2020 AT 2:53 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Probable causes:

1. Excessive fuel pressure can be cause by restricted fuel return line
2. Defective Oxygen Sensors.
3. Leaking injectors and fuel pressure regulator.
4. Coolant temperature sensor out of calibration.
5. Restricted air intake system.
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Monday, August 3rd, 2020 AT 2:53 PM (Merged)
Tiny
DAVENAF
  • MEMBER
  • 1 POST
  • 1998 MITSUBISHI ECLIPSE
  • 4 CYL
  • 2WD
  • MANUAL
  • 174,000 MILES
My check engine light came on. I took it to autozone to get it diagnosed. The computed code given was p1105, which is for the fuel pressure solenoid. My question is what is the fuel pressure solenoid? What does it do? Where is it found? And Is it expensive to replace? What should I do about it?
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Monday, August 3rd, 2020 AT 2:53 PM (Merged)
Tiny
LEGITIMATE007
  • MECHANIC
  • 5,121 POSTS
Fuel pressure solenoid, I believe is your fuel pressure regulator. Located on left side of firewall
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Monday, August 3rd, 2020 AT 2:53 PM (Merged)
Tiny
7IRISH1
  • MEMBER
  • 1 POST
Here is the answer to your Fuel Pressure Solenoid question with pictures/location/description. P1105 is not your Fuel Pressure Regulator, it IS your Solenoid. The Solenoid is connected to your Regulator via a vaccum hose. Autozone, Checker, PepBoys employees are not mechanics, they sell parts to us hobbyists/mechanics. The below information can be confirmed with the dealer, don't waste your time with the local "experts" at part stores, they will try to sell you a regulator and say it is the same thing:)
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-2
Monday, August 3rd, 2020 AT 2:53 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 1998 MITSUBISHI ECLIPSE
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 101,000 MILES
1998 Mitsubishi Eclipse mileage: 101,000. I just purchased this car and while driving it home the check engine light came on. I took it to the shop and they scanned the engine and came up with a code 14. Throttle position sensor was the problem. The only problem I have had with the car is it shifts slowly and sometimes jerks when it does. The car is an automatic. Are the mechanics right with their diagnosis? Or could the problem lie somewhere else? Thank you for your time.
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Monday, August 3rd, 2020 AT 2:53 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
The throttle position sensor tells the computer how far open the throttle is. This does affect the transmission shift points. Your mechanic appears to be on the right track.
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Monday, August 3rd, 2020 AT 2:53 PM (Merged)

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