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Old 04-05-2016, 09:04 PM
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2005 Jeep Grand Cherokee V6 3.7 L. HESITATING

2005 Jeep Grand Cherokee V6 3.7 L.
Iíve tried everything I can think of to fix a Hesitation / Surging problem. The car starts perfectly fine. It idles perfectly fine, but when I try to accelerate from a stop position there is no power at all, then a few seconds later I feel the engine actually engaging and the car takes off. During normal or fast driving the car pulses and I can actually see the RPMs slightly shifting up and down. It feels like is shifting between a few cylinders to all 6 cylinders, this is the best I can describe it. I have done the fallowing: New Spark plugs, New Ignition Coils, New TPS Sensor, New Oxygen Sensors, I have checked and cleaned all the vacuum lines, I have used air intake cleaner plus added Sea Foam to all the lines and the gas tank.
The only two other things that I can think of are the EVAP Solenoid and the EGR Valve. After that I have no more Ideas.
Any suggestions are welcomed!!!

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Old 04-05-2016, 09:42 PM
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Originally Posted by Alex MIAMI View Post
2005 Jeep Grand Cherokee V6 3.7 L.
I’ve tried everything I can think of to fix a Hesitation / Surging problem. The car starts perfectly fine. It idles perfectly fine, but when I try to accelerate from a stop position there is no power at all, then a few seconds later I feel the engine actually engaging and the car takes off. During normal or fast driving the car pulses and I can actually see the RPMs slightly shifting up and down. It feels like is shifting between a few cylinders to all 6 cylinders, this is the best I can describe it. I have done the fallowing: New Spark plugs, New Ignition Coils, New TPS Sensor, New Oxygen Sensors, I have checked and cleaned all the vacuum lines, I have used air intake cleaner plus added Sea Foam to all the lines and the gas tank.
The only two other things that I can think of are the EVAP Solenoid and the EGR Valve. After that I have no more Ideas.
Any suggestions are welcomed!!!
Have you tried the cam and crank sensors? How many miles are on it? Also have you cleaned the IAC?
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Old 04-05-2016, 10:02 PM
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Re: 2005 Jeep Grand Cherokee V6 3.7 L. HESITATING

Mine does this as well. It's an off and on issue at best. I did the spark plugs, MAP sensor, added a high flow air filter when I replaced my old one, and new coils. Have no idea why it still happens. Does yours stall on the first crank every once in a while?
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Old 04-06-2016, 06:53 AM
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Originally Posted by Dhenry101 View Post
Mine does this as well. It's an off and on issue at best. I did the spark plugs, MAP sensor, added a high flow air filter when I replaced my old one, and new coils. Have no idea why it still happens. Does yours stall on the first crank every once in a while?
What year is yours. I may get some insight into what it could be.
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Old 04-06-2016, 07:46 AM
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Re: 2005 Jeep Grand Cherokee V6 3.7 L. HESITATING

Thank you for your quick response. YES I did also cleaned the IAC valve. It has 160k miles. I have not changed the CAM & CRANK sensors.
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Old 04-06-2016, 09:47 AM
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Re: 2005 Jeep Grand Cherokee V6 3.7 L. HESITATING

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What year is yours. I may get some insight into what it could be.
Mine is a 2005
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Old 04-06-2016, 12:10 PM
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Re: 2005 Jeep Grand Cherokee V6 3.7 L. HESITATING

2005 Jeep Grand Cherokee V6 3.7 L.
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Old 04-06-2016, 09:59 PM
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Originally Posted by Dhenry101 View Post

Mine is a 2005
Alright. Just saw that you did in fact clean the IAC. Did you change the TPS? Don't remember if you did or not. That can be a culprit too.

But yeah, I'd look at the cam and crank sensors, they control the timing of the ignition
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