HELP! Sputtering/misfiring ONLY during acceleration and UNDER LOAD AFTER tune-up
CF Veteran
Joined: Dec 2015
Posts: 3,038
Likes: 338
From: PA
Year: 1997
Model: Cherokee
Engine: 4.0L
What was the solution to this issue? I've been having the same issue for years, and my plug, wire, distributor cap and rotor tuneup just made it worse. The hesitation is usually resolved by stomping on the gas pedal. I've already replaced the above, TPS, exhaust manifold, and O2 sensors.
Newbie
Joined: Apr 2019
Posts: 1
Likes: 0
Model: Cherokee (XJ)
Sputtering and misfirring
recently my ol man had bought a toyota sr5 truck , well the transmission started acting up and after replacing the seal in it, the truck starts acting like it was skipping.So fortunately for me my brother in law was a mechanic and had the same problem on his sunfire.A simple thing so uncommon to be the problem is exactly where it lay's.The reason for the sputtering and misfire is the tps sensor or (throttle positioner sensor).
Newbie
Joined: Aug 2021
Posts: 1
Likes: 0
From: Roseburg Oregon
Year: 1997
Model: Grand Cherokee (ZJ)
Engine: 4.0l
Hey guys I'm having the same issue with my 97zj. Bucks with acceleration only. I've replaced cam/crank sensors, coil, PCM, fuel pump assembly, even new plugs and wires. I'm at a loss!! I've owned my Jeep for two years and she's been doing this for a year and a half now. 🥴😭
Newbie
Joined: Mar 2025
Posts: 2
Likes: 0
Engine misfhrei g
Right after replacing the plugs, I flashed the onboard computer using the positive-lead to AC condensor, ignition on, headlights on then off procedure. That immediately fixed all symptoms, and I could not make it misfire/sputter for anything, even using the previously surefire ways like going up a steep hill with a cold engine. It remained completely resolved for 2-3 days, after which it started misfiring/sputtering again, but with FAR less frequency. Maybe 3-4 times within 10 min after a cold start, and then maybe 1-2 times more during a 30-min drive. It has remained that way for the past week or so.
Not sure what is going on exactly as the computer "relearns" the fuel/air ratios, etc., and why it functioned perfectly under the factory settings, but then has resumed under, presumably, some level of learned settings.
Any ideas?
Thanks!
Dave
Not sure what is going on exactly as the computer "relearns" the fuel/air ratios, etc., and why it functioned perfectly under the factory settings, but then has resumed under, presumably, some level of learned settings.
Any ideas?
Thanks!
Dave
Senior Member
Joined: Jun 2019
Posts: 645
Likes: 184
From: Northern California
Year: 1999
Model: Cherokee (XJ)
Engine: 4.0 w/ Banks header & K&N intake
injectors
I tried all the sensor tests then I removed my injectors, cleaned the crap out of them and tested them with a 9V battery listening for a click. Put them back in and the old 6 stopped spurring