2003 jeep liberty

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Rangermeyer275

New Member
Joined
Feb 6, 2022
Messages
9
Reaction score
0
So the problem I am having is it throws a code on spark plugs and cils.
It will run great then all of a sudden I can barely keep it running. I will have to pull the negative battery cable and that seems to reset it. The only code is plugs.
Any help would be appreciated
 

tommudd

Moderator
Staff member
Moderator
Joined
Jul 14, 2005
Messages
22,456
Reaction score
3,642
Location
Southeastern Ohio
What spark plugs are you running and how long have they been in there ?
NGK coppers only and every 30-35000 miles
 

Rangermeyer275

New Member
Joined
Feb 6, 2022
Messages
9
Reaction score
0
Threw in new ngk plugs. Now I get an evap leak once in a while that just lags the motor and miss fires it. Gas cap good. I will rest it and it will be fine for 150 miles. Then throws a leak code. Only happens when I start it once in a while. Any ideas
 

Rangermeyer275

New Member
Joined
Feb 6, 2022
Messages
9
Reaction score
0
Threw in new ngk plugs. Now I get an evap leak once in a while that just lags the motor and miss fires it. Gas cap good. I will rest it and it will be fine for 150 miles. Then throws a leak code. Only happens when I start it once in a while. Any ideas
I will reset code
 

tommudd

Moderator
Staff member
Moderator
Joined
Jul 14, 2005
Messages
22,456
Reaction score
3,642
Location
Southeastern Ohio
Threw in new ngk plugs. Now I get an evap leak once in a while that just lags the motor and miss fires it. Gas cap good. I will rest it and it will be fine for 150 miles. Then throws a leak code. Only happens when I start it once in a while. Any ideas
Need to go over all hoses and check them very close, there can be a very small crack in one of the hoses that maybe hard to see
Common issues as these KJs get older , hoses do not last forever
 

Rough

New Member
Joined
Sep 20, 2017
Messages
17
Reaction score
14
Location
PA
Threw in new ngk plugs. Now I get an evap leak once in a while that just lags the motor and miss fires it. Gas cap good. I will rest it and it will be fine for 150 miles. Then throws a leak code. Only happens when I start it once in a while. Any ideas
The CEL may not activate until the fault is detected several times over multiple start ups. Once you erase the code you're restarting the process. Initially thought mine was the gas cap but found it was a very small leak in the vapor leak detection pump, just enough to set the code about once a week. Later found that a leaking gas cap will set a dash warning light of it's own.
 

Ksat

Full Access Member
Joined
Nov 11, 2018
Messages
307
Reaction score
127
Location
ny
Threw in new ngk plugs. Now I get an evap leak once in a while that just lags the motor and miss fires it. Gas cap good. I will rest it and it will be fine for 150 miles. Then throws a leak code. Only happens when I start it once in a while. Any ideas

Are you sure the EVAP issue is what's causing the lagging and misfiring? You mentioned earlier you were getting codes for "spark plugs and coils," but what were those codes exactly?

An EVAP problem could cause a vacuum leak which can make the engine run as you described, but I don't know if you can just assume that because you have a related code.
 

Rangermeyer275

New Member
Joined
Feb 6, 2022
Messages
9
Reaction score
0
The CEL may not activate until the fault is detected several times over multiple start ups. Once you erase the code you're restarting the process. Initially thought mine was the gas cap but found it was a very small leak in the vapor leak detection pump, just enough to set the code about once a week. Later found that a leaking gas cap will set a dash warning light of it's own.
i will have to check it this weekend as i work a lot of hours. ty
 

Latest posts

Members online

Top