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22:40:25 - 12/19/2024
V6 Dakotas
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BigMike
Dodge Dakota
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12/28/2005
22:32:51
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 Subject: Check Engine Light
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Message:
This one has me baffled. After spending $1500, I still have a constant check engine light. I have had all of the ignition components replaced, fuel injection cleaned, a bogus service bulletin related to the power steering performed and still the same issue. I do not know the code but the dealer tells me that it is an "intermittent miss". His next suggestion was to pull the heads and check the valves and springs. My suggestion was that he go to hell. The truck is a 2001 V-6 with 73K miles. Any ideas?
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DrPepper
Dodge Dakota
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12/31/2005
12:22:15
| RE: Check Engine Light
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Message:
Your dealer needs to talk to your lawyer. The check engine codes are stored in the computer and read by a scanner. After 1996 all vehicles are "OBD" (on board diagnostics)compatible from the factory. The code will tell which system is at fault, sometimes which component, and it is stored in memory. Your dealer KNOWS what the code is.
I have a 2003 QuadCab that the engine light came on last week. My scanner told me the EVAP system had a small leak. I called my dealer and the service mgr. asked if I filled my gas tank with the ENGINE RUNNING? Yup, the "OBD system" thinks it's a leak, if the GAS CAP is OFF and THE ENGINE IS RUNNING. In a few days the light will go off by itself because the cap is back on and the OBD keeps checking. All you see is the check engine light, and the dealer sees your GREEN$$.
I bought an ACTRON CP9145 OBD scanner several years ago and have used it many, many times. No guessing or BS from the dealer. Best $350 I've spent.
Next, does the engine have a skip at idle or under load? If not find the code!!!!
If it does, have a compression test done by someone who knows how to do it right. Pull the plugs, open the throttle plate, screw in a compression gauge, read the cylinder pressure and write it down for all six. Chalk on the fender or fan shroud is perfect. They should be within 10% of each other. Example:110 to 125psi. If they are close it's an ignition or fuel problem, and the OBD code will tell you that.
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Jeremy
Dodge Dakota
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1/04/2006
11:44:05
| RE: Check Engine Light
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Message:
you can read the code yourself. 1998 is the only year the key on off on off on doesnt work. 1997 flashes the light, and 1999 and up read the code in the odometer display. it will give you a P#### then find a list of the codes, and you know what it is.
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davec
Dodge Dakota
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1/04/2006
15:11:01
| RE: Check Engine Light
IP: Logged
Message:
Your dealer may not be far off. A busted, bent, or burnt valve WILL cause a misfire code. And I've seen all those conditions on the 3.9L. I'm not saying that's what it is...but it's possible. I do agree with DrPepper though...they should perform a good compression test as well as a cylinder leak down test. Both of those tests will show a mechanical problem. If it passes those, go to ignition and/or fuel.
By the way, misfires are read when a slow-down in RPM (at the crankshaft) is seen. The crank slows down when combustion is not correct...then you have a misfire and MIL illumination.
dave
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