Engine Surging-Please Help!
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Joined: Aug 2011
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Engine Surging-Please Help!
My 2005 Dodge Dakota 4.7 has some problems and I can't figure them out (neither can a couple mechanics). My engine surges fairly drastically when in park most of the time (not all of the time). My transmission is lurching at times when shifting and sometimes fails to downshift when coming to a stop. I've had to manually drop it down to 1st or 2nd. There were no codes forever, but then recently the light came on a p0068 code came up (the light has since gone off). The mechanic said his computer didn't give him any troubleshooting options. I've replaced the EGR valve last year and recently replaced the TPS, IACV, and MAP sensor thinking one of those was the problem. The local dodge dealer couldn't find anything wrong and just cleaned the throttle bottle thinking that may help, which it didn't. Any thoughts?? Thanks!
We can start with the transmission..
- When was the last fluid change?
- Did you use change the filters? (both on a 4x4)
- Did you use OEM filters?
For the Engine surging / Code.
Trouble Code: P0068
MAP Sensor/TP Sensor Correction - High Flow/Vacuum Leak
Trouble Code Conditions:Engine started; engine speed over 2000 rpm, and the PCM detected the Manifold Air Pressure (MAP) value dropped to less than 1.5" Hg with the throttle closed during the test.
Possible Causes:
- When was the last fluid change?
- Did you use change the filters? (both on a 4x4)
- Did you use OEM filters?
For the Engine surging / Code.
Trouble Code: P0068
MAP Sensor/TP Sensor Correction - High Flow/Vacuum Leak
Trouble Code Conditions:Engine started; engine speed over 2000 rpm, and the PCM detected the Manifold Air Pressure (MAP) value dropped to less than 1.5" Hg with the throttle closed during the test.
Possible Causes:
- An engine vacuum leak present
- High resistance in the MAP ground circuit, MAP Sensor signal or VREF (5v) circuit
- High resistance in the TP ground, TP circuit or the TP Sensor VREF (5v) circuit
- MAP Sensor is damaged or it has failed
- TP Sensor is damaged
Professional
Joined: Mar 2010
Posts: 241
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From: Orlando, FL
I had this same problem at my dealership. It was on a 2006 Mitsubishi Raider 4.7 V8 with 93,000 miles. Making a long story short, I found that the intake manifold gaskets were cracked. After replacing them and doing a reflash of the PCM, it ran like a champ.
Professional
Joined: Sep 2010
Posts: 110
Likes: 0
From: New Jersey
Mine does the same, depending on its mood. I'm 99% sure its related to the evaporative system going back to the gas tank. I've also changed all those things, while it improved overall running, its still flaky and inconsistent.