Engine Idles rough

Tiny
THANVAS
  • MEMBER
  • 2004 MITSUBISHI LANCER
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 200,000 MILES
My car was was parked for around a month or two before I started it up and noticed the rough idle problem. Before it was running fine. When I started the car up after two month I would drive 15 feet or so and the car would stall and turn off, but it would start right back up. I looked into the problem and I noticed that the air intake duct had a crack and I also noticed the vacuum hose going to the egv valve was completely off. I plug the hose back in and replaced the air intake duct with a new one. The car didn't stall and turn off any more, but I noticed the rough idle. Running on the highway or at 20+mph the car runs fine. I thought maybe it was the egv valve, I checked and cleaned it, it was fine. I also thought maybe it was the MAF sensor, bought and replace with a new one. Same problem. I tried to troubleshoot the car by disconnecting the vacuum hose when the car is running and the car actually runs better when I disconnect the hose that runs to the egv valve, but once I plug the hose with my thumb the car dies. The car isn't throwing any check code. I don't know what else to check.
Do you
have the same problem?
Yes
No
Tuesday, December 29th, 2020 AT 3:32 PM

1 Reply

Tiny
KEN L
  • ADMIN
This sounds like you have low compression in one cylinders or one of the fuel injectors is not working correctly we can tell by pulling the spark plugs in order to see if they all look the same. These guides can help as well:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

and

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

Can you please shoot a quick video with your phone so we can see what's going on? that would be great. You can upload it here with your response.
Was this
answer
helpful?
Yes
No
Wednesday, December 30th, 2020 AT 3:48 PM

Please login or register to post a reply.

Sponsored links