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sonny
Dodge Dakota
JOIN HERE
9/26/2009
23:59:15
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 Subject: 2000 dak 4.7 smog fail
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Message:
my 2000 4.7 failed smog test today.im worried that a recent pcm swap might be the cause.the company i bought it from flashed to spec from my vin for my dak.it has been driven at least 200 mi since but has sat for a couple months.had a quarter tank of gas while sitting,and i put another quarter in and romped on the gas for 25 miles driving straight to test station nice and hot.FAILED. im changing plugs tonight with autolight platnums,making sure gap is correct.anyone have any more ideas on what more i should do?
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Kowalski
GenIII
9/27/2009
08:43:50
|  RE: 2000 dak 4.7 smog fail
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Message:
Might help if you told the guys specifically what category it failed in, and by how much. Also if you have done any mods to the truck, and the milage.
Lead, follow, or get out of the way
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sonny
Dodge Dakota
JOIN HERE
9/27/2009
16:42:40
| RE: 2000 dak 4.7 smog fail
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Message:
only mod is the kn air filter. as far as the area it failed (california) 25 mph test, max hc (ppm)28,my truck had 42 .hope that helps.can you tell me what i should do to get the pcm to relearn for the plug change? i have done the quick battery reset and started the truck 15 times.do i need to drive 200 miles?i cant really afford it.
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sonny
Dodge Dakota
JOIN HERE
9/27/2009
16:44:04
| RE: 2000 dak 4.7 smog fail
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Message:
milage is 161.588
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Kowalski
GenIII
9/28/2009
08:20:10
| RE: 2000 dak 4.7 smog fail
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Message:
How bad where the plugs you took out ? I don't think you needed to reset the PCM for the plug change, now you will have to drive it until the testing station doesn't see the PCM as being recently reset. Not sure how much driving that will be; too bad you didn't ask before resetting the computer.
Lead, follow, or get out of the way
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modain
GenIII
10/07/2009
13:43:51
|  RE: 2000 dak 4.7 smog fail
IP: Logged
Message:
High HC readings come from incomplete combustion. Best place to start is to make sure the ignition is working properly: new plugs, make sure the coils are working properly. Beyond that you'd need to make sure your injectors are not faulty.
Is the truck consuming oil? That could account for extra hyrdocarbons being present in the cylinder that don't get burnt completely.
What's your left foot doing?
==============
2002 Graphite QC SLT Plus, 4.7L, NV3500, Superchips 3715, 3.92 LSD, R/T rear swaybar, no chrome, loads o'fun...
2001 Patriot Blue Durango SLT, 4.7L, 45RFE, Superchips 3715, 3.55 Open (for now)
1999 Forest Green Dakota RC Sport, 2.5L, NV1500, 3.55 Open
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