Cylinder 1 Misfire

Asked by Justine Feb 03, 2020 at 09:32 AM about the 2015 Jeep Grand Cherokee SRT 4WD

Question type: Maintenance & Repair

2015 SRT Grand Cherokee, 84k miles, original plugs and coil packs.. did a little
launch in the car, got a check engine light P0301 - Cylinder 1 misfire. Could it
be plugs and packs?

7 Answers

103,215

It's easy to eliminate a plug or coil pack as the cause, just swap it around with one of the others, and see if the problem follows. You could also have a bad injector. (You don't have to swap around an injector, you can unplug it while engine is running and listen for a change in idle.) When you do swap any of these around clear the code and wait to see if it comes back. Most better quality code scanners can clear a code. A code will clear itself but it may take a while. After all this, you start to get into mechanical reasons for a misfire, namely a bent valve, bad lifter, timing, or head gasket. A bad EGR can sometimes show up as a cylinder 1 misfire. But unless you've really been beating on your engine, those aren't typical at only 84K miles.

2 people found this helpful.

I would go ahead and change the plugs as you are near the time to do so anyway.

1 people found this helpful.
50

Book states plugs should be changed at 100k. My stop/start option had stopped working days ago. I had a week-end excursion planned for months. Driving down the highway, my "A!" light came on as the car bucked lightly. I thought it was the road until I noticed the light. Accelerating, the check engine light began to blink, eventually becoming constant as the vehicle began to shake. I had the code checked. I called my dealership to make an appointment for the next business day. I related the code and told them that , at the very least, i wanted my spark plugs replaced. I dropped it and it was diagnosed as my needing spark plugs as 3-4 of my plugs were misfiring(Duh-I told them that). That was $554.57-2 days ago. This morning the same stop/start "A!" light came on, the vehicle is bucking lightly and the check engine light blinking. The plugs might not necessarily be the actual problem, but a symptom.

5 people found this helpful.
10

Hey guys, was this problem ever resolved? I am having what seems like the exact same problem. I've already replaced all of my spark plugs & the EGR valve as those were the codes my scanner was throwing at me. I've got a 2016 Overland Grand Cherokee with about 100k miles on it. Thanks in advance!

1 people found this helpful.
30

Anyone else figure out the issue with the stop/start light coming on and engine light following acceleration?

2 people found this helpful.

Hey guys. so I had the car looked at and they had to replace the cam and there was an issue with the ECU they claimed. I think they lied about the ECU because it was tuned and the time was still on the car. But they replaced the cam and lifters.

30

After replacing cam and lifters issue was resolved? The dealership has no idea so far after a full day of diagnosing. Once I step on the gas hard the stop/start light comes on and then the engine light is lit permanently.

Your Answer:

Grand Cherokee

Looking for a Used Grand Cherokee in your area?

CarGurus has 3,238 nationwide Grand Cherokee listings starting at $4,995.

Postal Code:

CarGurus Experts

  • #1
    Hornet_2497
    Reputation
    8,960
  • #2
    Gene Arnett
    Reputation
    7,010
  • #3
    thejeepdoctor
    Reputation
    6,560
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Dodge Charger
38 Great Deals out of 645 listings starting at $4,888
Used Dodge Durango
46 Great Deals out of 2,266 listings starting at $5,500
Used Jeep Wrangler
145 Great Deals out of 5,071 listings starting at $5,450
Used Jeep Cherokee
97 Great Deals out of 1,654 listings starting at $3,950
Used Dodge Challenger
33 Great Deals out of 475 listings starting at $7,999
Used Ford F-150
321 Great Deals out of 14,968 listings starting at $1,712
Used RAM 1500
439 Great Deals out of 15,809 listings starting at $5,000
Used Chevrolet Tahoe
24 Great Deals out of 911 listings starting at $11,900
Used Chevrolet Silverado 1500
202 Great Deals out of 5,975 listings starting at $2,975
Used Ford Explorer
86 Great Deals out of 2,065 listings starting at $2,999
Used Toyota 4Runner
10 Great Deals out of 304 listings starting at $9,700
Used Chrysler 300
34 Great Deals out of 516 listings starting at $4,999
Used Chevrolet Corvette
29 Great Deals out of 1,060 listings starting at $15,871

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. Content will be removed if CarGurus becomes aware that it violates our policies.