'96 jeep 4.0 hesitation on load/ steady speed, stalling
For the past month now i have been experiencing hesitation on acceleration and a steady highway speed, dead spot in throttle, stalling at idle or around turns or coming to a stop and random misfires. it sound like a fuel problem or so you would think. i have replaced my fuel pump, fuel pressure regulator, fuel filter, fuel lines and i have cleaned out my fuel lines and injectors. well maybe ignition... replaced the distributor, plugs, cap, rotor and wires. well maybe a sensor... i replaced the MAP sensor, IAC motor, CPS, and O2 sensors. i am 18 years old and en experienced mechanic i have swapped many engines and fixed many problems but i have never run into anything like this. since i have a dead spot and a random misfire i believe its a bad TPS that i have already replaced 3 times. but i balieve the TPS is giving a dead spot and probably an off injector pulse width. any suggestions/ advice i would be glad to talk thank you
Re: '96 jeep 4.0 hesitation on load/ steady speed,...
I am an experienced Technician , have over 30 years in the business , Chevy , Cadillac , Ford , Chrysler . An sonny your not old enough to be experienced. > sounds more like your like most people who post on here a glorified parts changer .
i believe its a bad TPS that i have already replaced 3 times. but i balieve the TPS is giving a dead spot and probably an off injector pulse width.???????????
WE TEST , NOT GUESS ! Take it to a quaified repair shop ,or go to a good automotive technology program an learn the correct way to fix automotive electronics . The industry is hurting for good Tech's , not back yard wantabees
my jeep was misfiring and i changed the same parts you changed.... When you changed your crank sensor, did you get parts from the dealer? if not u should trying changing the crank senor part from tne dealer. After market parts do not work good on Jeeps I had to learn the hard way..
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If you had a emissions problem and it has been corrected and the check light is out, then it should be cleared after 200 miles.Or will just show is a inactive fault
You have to do a drive cycle, the fuel tank has to be between 1/4 and 3/4 of a tank of fuel, can not be above or below this fuel level. To perform an OBDII Driving cycle do the following:
1. Cold Start In order to be classified as a cold start the enginecoolant temperature must be below 50ºC (122ºF) and within 6ºC (11ºF) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
2. Idle The engine must be run for two and a half minutes with the air conditioner on maximum and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
3. Accelerate Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
4. Hold Steady Speed Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
5. Decelerate Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
6. Accelerate Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
7. Hold Steady Speed Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
8. Decelerate This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.
To perform an OBDII Driving cycle do the following:
Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 50°C (122°F) and within 6°C (11°F) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
Accelerate. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). This will perform the same diagnostics as in step 3.
Hold Steady Speed. Hold a steady speed of 88km/hr (55mph) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.
Check fuel pressure at idle it should read 30psi. If you have a weak fuel pump it will act just like you describe. Located intake and replace the fuel filter.
Check fuel filter . You have a mechanical pump & a carburetor on that model dont you?...Check fuel pressure (should be around 6-7 lbs) and check coil immediately after it shuts down...sometimes coils will act like that just before they go bad..
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