SURGING / MISFIRE

2006 Chrysler Pacifica

Tiny

06PAC

September, 29, 2010 AT 1:13 PM

Engine Performance problem
2006 Chrysler Pacifica 6 cyl All Wheel Drive Automatic 60,000 miles

I own a 2006 touring AWD with 59,800 miles.

Over the past few thousand miles, I have noticed what can best be described as surging when accelerating. I notice it most on a warmer day while using the A/C. I also noticed it the other morning while driving approx 76 MPH, (our highway speed limits are 75) pulling a steep hill. The tranny shifted down to 3rd, I was not running the A/C and it was approx. 60 degrees F out.
The pac hasn't thrown any check engine lights and it is idling fine. The condition isn't getting any worse although; the power and fuel mileage are down a bit.

I replaced the plugs with factory platinum plugs @ 30,000 miles. I recently replaced the pcv valve. I also checked the condition and gap of all of the plugs. They were all the same light tan color. The gap was perfect. I used an ohmeter to check the resistance across the coils however; I was told that the only way to detect a bad coil is while it is under a load.

I have not checked the condition of the fuel tank sock or the fuel pressure.

UPDATE: The symptoms now exist under all driving conditions regardless of vehicle speed or load. Still no check engine light.

Does anyone have any suggestions?

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2 Answers

Tiny

Docfixit

September, 29, 2010 AT 1:33 PM

Check fuel pressure 58psi if good run some SeaFoam in tank to clean fuel system

Tiny

06PAC

September, 29, 2010 AT 2:26 PM

Thanks for the suggestion.

I'll check the pressure right away.

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