Question about 1999 Jeep Cherokee

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Both under constant throttle and acceleration I have had hesitation on three separate occasions over 3 week period the rest of the time it runs fine.

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Check the front O2 sensor. I had a 99 Jeep that would stutter and seem to lose power while accelerating. No check engine light came on but took it to a shop and had them put it on a computer. Come to find out that the O2 sensor was giving the engine misreads and was telling the engine to take in more fuel. Causing one of the cylinders to misfire.

Posted on Oct 22, 2010

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Reduced engine power message


You don't say what make an model vehicle ! But with most vehicle makes it has to do with the Throttle Actuator Control (TAC) System , electronic throttle control ! are you having reduced engine power ? There are probably DTC'S - diagnostic trouble codes stored in the PCM - engine computer .
The throttle actuator control (TAC) system is used to improve emissions, fuel economy, and driveability. The TAC system eliminates the mechanical link between the accelerator pedal and the throttle plate. The TAC system eliminates the need for a cruise control module and idle air control motor. The following is a list of TAC system components:
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The accelerator pedal assembly includes the following components:


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The accelerator pedal


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The accelerator pedal position (APP) sensor 1


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The APP sensor 2


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The throttle body assembly includes the following components:


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The throttle position (TP) sensor 1


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The TP sensor 2


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The throttle actuator motor


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The throttle plate


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The engine control module (ECM)


The ECM monitors the driver demand for acceleration with 2 APP sensors. The APP sensor 1 signal voltage range is from about 0.98-4.16 volts as the accelerator pedal is moved from the rest pedal position to the full pedal travel position. The APP sensor 2 range is from about 0.49-2.08 volts as the accelerator pedal is moved from the rest pedal position to the full pedal travel position. The ECM processes this information along with other sensor inputs to command the throttle plate to a certain position.
The throttle plate is controlled with a direct current motor called a throttle actuator control motor. The ECM can move this motor in the forward or reverse direction by controlling battery voltage and/or ground to 2 internal drivers. The throttle plate is held at a 7 percent rest position using a constant force return spring. This spring holds the throttle plate to the rest position when there is no current flowing to the actuator motor.
The ECM monitors the throttle plate angle with 2 TP sensors. The TP sensor 1 signal voltage range is from about 0.5-4.25 volts as the throttle plate is moved from 0 percent to wide open throttle (WOT). The TP sensor 2 voltage range is from about 4.45-0.7 volts as the throttle plate is moved from 0 percent to WOT.
The ECM performs diagnostics that monitor the voltage levels of both APP sensors, both TP sensors, and the throttle actuator control motor circuit. It also monitors the spring return rate of both return springs that are housed internal to the throttle body assembly. These diagnostics are performed at different times based on whether the engine is running, not running, or whether the ECM is currently in a throttle body relearn procedure.
Every ignition cycle, the ECM performs a quick throttle return spring test to make sure the throttle plate can return to the 7 percent rest position from the 0 percent position. This is to ensure that the throttle plate can be brought to the rest position in case of an actuator motor circuit failure. Observe, under cold conditions, the ECM commands the throttle plate to 7 percent with the ignition ON and the engine OFF to release any ice that may have formed on the throttle plate.

Aug 21, 2016 | Cars & Trucks

5 Answers

I've got a 1996 jeep grand Cherokee with the 5.2 v8 fuel injected Holley throttle body. My problem is while driving at soft or low acceleration it accelerates fine, but if you hit the throttle hard it


I would check the voltage on the throttle portion sensor with the engine off from idle to wide open throttle.If there are any dead spots, replace the sensor. If the tps checks out, you should check fuel pressure. If you have good fuel pressure, you may want to make sure there isn't a lot of slack in your timing chain. I don't believe you mentioned the mileage of your vehicle. Best of luck.

May 03, 2014 | 1996 Jeep Grand Cherokee

1 Answer

1995 vw gulf chico. hesitates when applying throttle or letting of throttle. idles fine and runs fine under constant acceleration. replacing plugs didnt fix it.


Have you checked the spark plug leads, disy cap and rotor. Does that model have points. Have you checked the coil. Some golfs have a rubber mount for the carby that splits and sucks air in. Have you changed the fuel filter. Is the air filter really dirty

Jan 01, 2013 | Volkswagen Cars & Trucks

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Hesitation on acceleration pulls down on hills it is cold blooded and lack of power


My brand new kia sportage 2L purchased in January 2010 gave me problems from the start. First gas tank was squeezed sometime before and vehicle kept running out of gas even though gas gauge showing gas inside. Dealer replaced gas tank. More persistent problem is the vehicle hesitates to accelerate especially if not driven for about three hours or so and when on an incline. Went back to dealer on several occasions but no solution. any ideas?

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2 Answers

Hesitates when u accelerate


IGNITION TIMING,dirty or clogged filter or injectior,low fue lpressure check filter and lines

May 07, 2010 | 1998 Ford Expedition

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Hesitation under load around 5% throttle


check throttle position sensor!! at throttle plate on side of throttle body.

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Subaru 1998 wrx hesitation


Hi , I had that problem with my wrx.Turned out the o2 sensor in the exhaust was faulty. The hasitation came on only on the open road.

Jan 19, 2009 | 1998 Subaru Impreza

1 Answer

2004 dodge caravan 2.4 Hesitates during Acceleration and at idele


You should definitely replace the fuel filter though this probably won't fix your hesitation. It wouldn't hurt to replace the spark plugs this is usually the culprit on these engine. I have the same engine in a '99 caravan and found the for some reason the spark plugs on cylinder 3 and 4 loosen up after one year and cause a misfire between 45 and 50 mph under load (when mildly accelerating).

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2 Answers

Strange intermittent hestitation


you know many things will cause this problem, but i recomend you to start with the cranshaft position sensor have it replace and look for some ignition coils may be use coils will be fine
but when a vehicle does not have spark plugs serviced a least every 30000 miles then the current coming from coils start taking plug wires and then the coils because there is a lot of power coming fron the coils it is between 12 to 50k volts
any way try first the crank sensor like i told you and let me know

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