engine sputters when I hit accelerator
02-12-2017, 09:58 AM
#1
Newbie
Thread Starter
Join Date: Feb 2017
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
engine sputters when I hit accelerator
Engine idle speed inconsistent, then when I step on accelerator engine sputters and dies. If going down the road I push too hard on accelerator engine sputters until I let up a little on accelerator. Its a 1990 cherokee 4.0. Any help?
02-12-2017, 08:31 PM
#2
CF Veteran
Last time mine did that it was an O2 sensor and my cat convertor. There are potentially 100s of things that could cause this though.
How's your exhaust? How's your maintenance? Refreshed some grounds lately? Done any seafoam treatments? Plugs wire etc?
How's your exhaust? How's your maintenance? Refreshed some grounds lately? Done any seafoam treatments? Plugs wire etc?
02-12-2017, 08:32 PM
#3
CF Veteran
Eventually... if you drive a jeep long enough, and don't do any preventive maintenance, it will start running poorly and quit.
Checked your Trans fluid lately?
Checked your Trans fluid lately?
02-13-2017, 02:20 PM
#4
CF Veteran
Join Date: Dec 2015
Location: PA
Posts: 3,038
Likes: 0
Received 333 Likes
on
277 Posts
Year: 1997
Model: Cherokee
Engine: 4.0L
A spit and sputter on acceleration could be bad gas, TPS, injectors, fuel pump, bad cat, etc.. Lots of stuff, really. When was its last tuneup?
02-14-2017, 07:29 PM
#7
CF Veteran
Join Date: Nov 2010
Location: In the middle of Minnesota!
Posts: 5,805
Received 99 Likes
on
88 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Agree with others. Get back to basics.
1. Tuneup. Fresh Champion plugs gapped to .035, quality plug wires, distributor cap, rotor, fuel filter.
2. Test fuel pressure. Should be 31 psi at idle. Now disconnect the vacuum line leading to the fuel pressure regulator and the pressure should jump to approximately 39 psi. Look for degrading of that vacuum line. Raw fuel in that vacuum line indicates a ruptured fuel pressure regulator.
Start there. As noted, there are a LOT of things that can cause this. But this is where I would start if it was in my garage.
1. Tuneup. Fresh Champion plugs gapped to .035, quality plug wires, distributor cap, rotor, fuel filter.
2. Test fuel pressure. Should be 31 psi at idle. Now disconnect the vacuum line leading to the fuel pressure regulator and the pressure should jump to approximately 39 psi. Look for degrading of that vacuum line. Raw fuel in that vacuum line indicates a ruptured fuel pressure regulator.
Start there. As noted, there are a LOT of things that can cause this. But this is where I would start if it was in my garage.