Rough running and EVAP sensor
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Rough running and EVAP sensor
My 2004/ 4.6L F-150 had misfire issues and rough idle. Since changing the plugs and a COP the idle is better. It seems to stutter a bit at low RPMs around town, but it fine at higher RPMs. I'm looking for ideas of what to check next. Also since fixing the misfire and clearing the codes from the computer it won't enable all the emissions monitors. I've drive over 100 miles and the EVAP monitor still isn't on. Any ideas? The truck has about 213K miles on it.
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Hotshot
Joined: Jan 2004
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From: St Louis
What codes are the computer showing?
The EVAP monitors are usually the last to run. You usually can still pass emissions testing with one or two incomplete monitors. Check your local regulations, if any.
The EVAP monitors are usually the last to run. You usually can still pass emissions testing with one or two incomplete monitors. Check your local regulations, if any.
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I had misfire codes that I was able to clear. In NH I've been told that a 2004 vehicle can have no monitors pending to pass emissions inspection. How long unit the EVAP sensor monitor to turn on? Could that have something to do with the motor being sluggish at low RPMs?
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Posting Guru
Joined: Jan 2015
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From: San Antonio, Texas
EVAP Monitor Test conditions
There is a WEALTH of other information in the OBDII Theory of Operation Manual. You can download a free copy for the 2004 Model from the following location. http://www.fordservicecontent.com/fo...t/OBDSM407.pdf
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