misfire and flashing check engine light? 4.0 inline 6 engine

325

Asked by Feb 08, 2017 at 12:58 PM about the 2003 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

Ive been getting a misfire when the engine temps gets to 210F, it will only do
this if it is idling, ounce i get the temp back down the misfire will go away, I am
thinking it is a catalytic converter based on what i have read online, It had 3
cats, 2 in the manifold and one down stream. Is the cats or something else, i
cant figure it out and i dont want to take it to shop.

5 Answers

7,165

That's what the flashing check engine light means. Random misfire. Check for codes to see where to go from here, if u keep driving it with misfires, it will plug up the catalytic. Ur misfires could be due to dirty throttle body, low fuel pressure, bad injectors among other things

1 of 1 people found this helpful.
325

the misfires didnt start happening until i started to put winter mix gas into, if i cat is bad which one is it? Correct me if i wrong but since it does have 3 cats does that mean it has the California emissions standards, i live in in ohio so im not really for sure.

250,915

Are you sure you have misfires? Scan for the codes as suggested above. Then you will know for sure. If you do get a misfire code, then you looking at replacing spark plugs and coils first.

325

So is it possible that I'm am losing spark and the unburned fuel is going into the cats causing the flashing light? It's acts like it misfiring but if I hold the rpms up for a little bit it clears up and and everything is fine agian

7,165

Something like that. Ur feeding fuel or lack of, that is not being properly burned and C02 sensors detects the inefficiency and turns check engine light on

Your Answer

Grand Cherokee

Looking for a Used Grand Cherokee in your area?

CarGurus has 2,713 nationwide Grand Cherokee listings starting at $1,871.

Postal Code:

Jeep Grand Cherokee Experts

  • #1
    inuevafreak
    Reputation
    2,110
  • #2
    Tom Demyan
    Reputation
    1,890
  • #3
    thejeepdoctor
    Reputation
    1,790
View All

Related Models For Sale

Used Ford Explorer
44 Great Deals out of 1,384 listings starting at $3,900
Used Jeep Wrangler
89 Great Deals out of 1,551 listings starting at $2,488
Used Toyota 4Runner
7 Great Deals out of 435 listings starting at $5,200
Used Dodge Durango
57 Great Deals out of 1,017 listings starting at $2,998
Used Chevrolet Tahoe
7 Great Deals out of 633 listings starting at $6,871
Used Ford F-150
455 Great Deals out of 9,152 listings starting at $922
Used Chevrolet Silverado 1500
157 Great Deals out of 10,639 listings starting at $100
Used BMW X5
35 Great Deals out of 749 listings starting at $3,977
Used Chevrolet Camaro
792 listings starting at $13,040
Used Jeep Liberty
16 Great Deals out of 169 listings starting at $999

Used Cars For Sale

2018 Jeep Grand Cherokee Laredo 4WD For Sale
16 listings starting at $46,440
2017 Jeep Grand Cherokee Laredo 4WD For Sale
5 Great Deals out of 205 listings starting at $29,507
2015 Jeep Grand Cherokee Laredo 4WD For Sale
8 Great Deals out of 58 listings starting at $24,800
2014 Jeep Grand Cherokee Laredo 4WD For Sale
31 listings starting at $20,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.