Running rough

Tiny
JESSIE473
  • MEMBER
  • 2003 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 121,000 MILES
No codes set. Turn off wait a few minutes try to restart runs rough it wont idle. Removed key and then restart and it is okay. It keeps happening four or five times a week. Never gets over 10 mpg either. Thanks for your help. You guys are great, so glad you are here.
Monday, June 24th, 2019 AT 9:33 AM

9 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

When was the last time that your vehicle had the spark plugs changed? This is what I would do first. In the diagrams down below I have included a description of your vehicle's ignition system as well as the type of spark plugs along with the proper gap for them. I have also included a link below for you to go to.

https://www.2carpros.com/articles/how-to-change-spark-plugs

Please go through these guides and get back to with how things turn out. There are other things to check as well, this is a good starting point.

Thanks,
Alex
2CarPros
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Monday, June 24th, 2019 AT 10:21 AM
Tiny
JESSIE473
  • MEMBER
  • 24 POSTS
Would platinum plugs make a difference?
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Monday, June 24th, 2019 AT 1:15 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Platinum spark plugs are intended to last a little longer than say copper spark plugs. There are even longer lasting spark plugs on the market, say like iridium, that are intended to last a really long time. My father's vehicle, a 2014 Hyundai Electra, for instance, came from the factory with a set of iridium spark plugs and they have never been changed. He has 130,000 miles on them with no drop in gas mileage or performance. But I can only recommend the spark plugs that originally came with your vehicle, but it is just a recommendation, you will ultimately be the one purchasing them.

Thanks,
Alex
2CarPros
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Tuesday, June 25th, 2019 AT 1:24 AM
Tiny
JESSIE473
  • MEMBER
  • 24 POSTS
I put in rc12ecc plugs. Seems to run okay, but check engine light came on and set p1762 code. Did I cause that? And what is it? I turned the key on three times and it said done, then the light went out. Will it come back on or should I have someone scan it? Thank you for the help.
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Friday, June 28th, 2019 AT 12:43 PM
Tiny
JESSIE473
  • MEMBER
  • 24 POSTS
PS: I drove it about two miles and it did not turn back on.
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Friday, June 28th, 2019 AT 12:45 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

Can you drive it for me one more time and if it doesn't turn back on then you have fixed it my friend. Please get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Sunday, June 30th, 2019 AT 1:43 PM
Tiny
JESSIE473
  • MEMBER
  • 24 POSTS
I started it up this morning, the check lite came on. It ran like it had a miss. Turned it off, took the key out then started it back up and light stayed out, and ran good. Drove it about six miles and I was okay again. Thanks again for your help.
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Sunday, June 30th, 2019 AT 3:08 PM
Tiny
JESSIE473
  • MEMBER
  • 24 POSTS
Today I drove it about 5 miles when I cranked it back up, it ran rough and then shut off. I put it in park started it again, it ran good again, it has done the same thing about every 50 miles I put in the factory plugs and it did run better. Thanks for your help.
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Tuesday, July 9th, 2019 AT 1:09 PM
Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello again,

In the diagrams down below I have included the factory diagnostic troubleshooting guide for Direct Trouble Code (DTC) P1762. Please go through this guide and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Thursday, July 11th, 2019 AT 1:48 AM

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