As noted above, I have a 2008 Camry LE, 2.4 LE with 154K. I've done a lot of maintenance work on it lately. This includes replacing the Denso Spark Plugs. Upon the replacing the SK20R11 plugs, and a bit of driving, a P0351 came up (indicating a problem with an ignition coil in a cylinder). That coil was replaced with a used (but functional) OEM Denso, and the code was moved into history.
Concurrently, I cleaned the MAF and the Throttle Body, with the appropriate CRC cleaners, in an appropriate manner.
At the end of these efforts, I also cleared the P0351 error code. Subsequently, I've driven the Camry for about 50 miles. This is what I noticed, running Live Data and Mode Six scans (from my Blue Driver):
1. Mode Six: There are a number (9) of "Purge Flow Monitors" reading incomplete. If anyone has the Gen 6 (2007-11) choreography for how to have the EMC complete these tests, I'd be appreciative.
2. The Short Term and Long Term Fuel Trims are a bit odd: Short term fuel trims are near zero (-0.8 to -1.2 percent). It's a well-behaved engine at idle.
The Long Term Fuel Trim (over a 50 mile history, since I cleared the PO351 code) is over plus 10. (The last reading was 11.7). This is far higher than anything I've previously recorded on this well-maintained 2AZ-FE engine.
So, I have a few questions:
a. If anyone has the Gen 6 (2007-11) choreography for how to have these tests completed, I'd be appreciative.
b. Is there any relationship between these nine "purge monitor flow" incomplete tests and the poor LTFT (at 11.7, last reading)? If so, I'd like to understand that relationship.
If there is, is it fair to assume a change downward in the LTFT once these tests are complete?
c. Am I correct to assume that the wiping the code created the LTFT issue? (It's hard to imagine that a reasonably competent job with the MAF sensor and throttle body cleaning would generate this problem).
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Parenthetically, I did check for anything that looked like a vacuum leak when I removed the air duct, and then reinstalled it. I couldn't find anything. I suppose unmonitored air (gasket leak, etc). could cause such a lean condition, but there was nothing obvious on visual inspection. I also opened and closed the relatively new OEM gas cap (2.5 years).
Or, am I potentially looking at a defective purge flow value (under the hood)?
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Thanks for reading.
you easily could have a defective purge flow valve and your long-term fuel trim it's adding fuel which means it's running lean. So pray it's just that because if the purge valve is letting too much vacuum and I don't make it run lean pray it's that easy. But it's not a good idea to randomly swap out coils from one to another they all are supposed to be about the same age to fire exactly the same and who knows what goes into the mix if you put in a used one of unknown age and where
