Help with 00 4Runner
#1
Help with 00 4Runner
My 4Runner has 135K miles on it and a few months ago the CEL comes on code P0420 dealer says the CAT's are bad (they did rattle etc...) wants $2,500 for new CAT's I can't go that high so I have them replaced at another shop for $800 and the CEL stays off for 3 months then comes back same code, I replaced both O2 sensors and the CEL stays off for a couple of months then comes back same code. I reset the code and it comes back every 30-60 miles. I finally got the O2 simulator from URD and put it on 2 weeks ago, 700+ miles and no CEL, but my fuel milage has gone to crap since I put the simulator on. I have put in a new air filter, PCV valve and the plugs only have 23K miles on them, I looked at a couple and they look ok to me.
During the time that the CEL kept coming on my milage was the same about 300 miles out of a tank mixed highway and city, now I am at 270 or so. Any thought would be appreciated I am really confused.
During the time that the CEL kept coming on my milage was the same about 300 miles out of a tank mixed highway and city, now I am at 270 or so. Any thought would be appreciated I am really confused.
#3
it does have CA emmissions and the A/F sensor was replaced as well as the O2 sensor. They are aftermarket CAT's, what I don't understand is that they were put on in December and the gas mileage has been fine until 2 weeks ago the A/F & O2 sensors were replaced in February. I also cleaned the MAF Monday night but that did not look really dirty
#6
cats have nothing to do with performance unless they are plugged or flow too freely
what is making your engine run good or run like crap is the A/F sensor and stuff toward the motor. after the a/f sensor, nothing (bad cat if not plugged, bad o2 sensor) will affect performance, but can throw a MIL.
what is making your engine run good or run like crap is the A/F sensor and stuff toward the motor. after the a/f sensor, nothing (bad cat if not plugged, bad o2 sensor) will affect performance, but can throw a MIL.
#7
it does have CA emmissions and the A/F sensor was replaced as well as the O2 sensor. They are aftermarket CAT's, what I don't understand is that they were put on in December and the gas mileage has been fine until 2 weeks ago the A/F & O2 sensors were replaced in February. I also cleaned the MAF Monday night but that did not look really dirty
however most codes related to emissions can also be one of 7 different subsystems, including the integrity of the actual wiring harnesses...so perhaps it isn't related to the exhaust pipe parts
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#8
The A/F sensor is a stock one from the dealer I pulled it out and looked at it a couple of weeks back and while it looked like it was in the exhaust stream and had some black soot on it I guess it was ok, it only has 5-6K on it. It does not make sense to me that the milage changed as soon as the simulator was installed.
Has anyone else experienced a drop in fuel mileage with the sim installed? should the A/F sensor look a little sooty?
Has anyone else experienced a drop in fuel mileage with the sim installed? should the A/F sensor look a little sooty?
Last edited by Kindervb; 07-17-2008 at 02:41 AM.
#9
One other thing I did remember I ran some BG44 through it about 2 mo ago then the CEL started to pop P0420 again could this have fouled the A/F sensor? If it did would the fuel milage not have dropped at that point?
#11
I am trying to understand how it could be the aftermarket CAT's when they were replaced in early December and the fuel mileage has been the same unitl 2 weeks ago. Maybe I am missing something, but to me if the CAT's were the issue the FM would have been affected before now.
#12
My 4Runner has 135K miles on it and a few months ago the CEL comes on code P0420 dealer says the CAT's are bad (they did rattle etc...) wants $2,500 for new CAT's I can't go that high so I have them replaced at another shop for $800 and the CEL stays off for 3 months then comes back same code, I replaced both O2 sensors and the CEL stays off for a couple of months then comes back same code. I reset the code and it comes back every 30-60 miles. I finally got the O2 simulator from URD and put it on 2 weeks ago, 700+ miles and no CEL, but my fuel milage has gone to crap since I put the simulator on. I have put in a new air filter, PCV valve and the plugs only have 23K miles on them, I looked at a couple and they look ok to me.
During the time that the CEL kept coming on my milage was the same about 300 miles out of a tank mixed highway and city, now I am at 270 or so. Any thought would be appreciated I am really confused.
During the time that the CEL kept coming on my milage was the same about 300 miles out of a tank mixed highway and city, now I am at 270 or so. Any thought would be appreciated I am really confused.
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