Misfire

RANYRIZK

MEMBER
2014 JEEP GRAND CHEROKEE
3.6L
V6
4WD
AUTOMATIC
35,000 MILES

The car makes a discontinuity at idle mostly when it is at rear. The problem is much less if I turn on the car with the remote control(without the break pedal).
The scanner gave those codes:
P0301
P0300 (pending)
P0172 (pending)
P0132 (pending)
Thank you for your help.

9 Replies

DANNY L

MECHANIC
5,648 POSTS

Hello, I am Danny.

The codes you supplied are showing as cylinder number one misfire (P0301 and P0300). You should look into having the cylinder number one ignition coil (mounted on top of cylinder number one spark plug) and ignition coil electrical connector tested to see what the cause of the misfire. As far as the other two codes(P0172 and P0132) shows as that cylinder bank and oxygen sensor is running rich due to the unburned fuel caused by the misfire. I would get fixed as soon as you can because unburned fuel from a misfire going through the exhaust system can ruin the oxygen sensors and catalytic converters. I have attached a tutorial for you to view about misfires.

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

I have also attached a picture of the cylinder number one location. Hope this helps and thanks for using 2CarPros.

Danny-

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Sunday, December 9th, 2018 AT 11:18 PM

RANYRIZK

MEMBER
39 POSTS

Hello Danny,

Thank you for your reply.
The scanner of the technician gave an additional code
C1082-02
I followed the diagnostic as it is described in the link, every thing is normal. Moreover, the misfire doesn't occur every time.
Best regards

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Wednesday, December 19th, 2018 AT 5:28 AM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

Yes, that is why code P0300 random/multiple misfire shows up. That is why it can be random. Have you checked the parameters?Your new code C1082-02 has to deal with a vacuum pressure sensor signal loss. Hope this helps and thanks for using 2CarPros.
Danny-

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Thursday, December 20th, 2018 AT 1:43 AM

RANYRIZK

MEMBER
39 POSTS

I changed the booster, the car now seems okay.
Thank you so much.
Best regards.

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Thursday, December 20th, 2018 AT 1:45 AM

DANNY L

MECHANIC
5,648 POSTS

You are welcome!
Glad everything worked out well. Let us know if you ever have any other questions. We're here to help. Thanks again for using 2CarPros.
Danny-

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Thursday, December 20th, 2018 AT 1:54 AM

RANYRIZK

MEMBER
39 POSTS

The code C1082-02 repeated at a long slope down, even with the new booster.
However until now there is no misfire.
Could you help me?

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Thursday, December 27th, 2018 AT 2:49 AM

DANNY L

MECHANIC
5,648 POSTS

Hello again.

I've attached a few pictures for step-by-step testing procedures for your C1082 code "Vacuum Pressure Sensor" Here is a link for a tutorial showing how to test wiring:

https://www.2carpros.com/articles/how-to-check-wiring

Hope this helps and thanks again for using 2CarPros.
Danny-

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