ECU "re-learning" after K&N FIPK install?
01-05-11, 02:10 PM
#16
I'm willing to bet it is the MAF. If you checked all the vaccuum hoses and they all look good then that's not the problem. The CRC MAF cleaner says it's safe on MAF sensors but on the bottle it says not to use it on toyota cars. I still use it but you just gotta be careful with it because MAF sensors are like jealous GF's. It only takes a little bit to make them angry.
So once you overspray a MAF, is it done for? I do have an extra MAF at home and will give that a try. I figure I would examine the hoses again because I'll have the negative battery cable off anyways for an hour to reset the ECU. So during that time, I'm planning to remove the hoses and take a closer look.
01-05-11, 03:40 PM
#19
I know. I've read the long list of things that could trigger a P0171 code. But when I think about it logically, what did I change or touch when installing the K&N FIPK? It comes down to MAF, vacuum hoses, couplers, etc. I didn't have any CEL before the install, so it would be very unlucky and coincidental if the spark plugs or injectors went out at the exact same time. I'm hoping to rectify the lean issue before it does ultimately cause something else like spark plugs to fail.
01-05-11, 04:44 PM
#21
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IT IS YOUR FUEL FILTER......maybe.... i had the same problem, and i replaced EVERYTHING. im telling you i spent close to 2k replacing parts related to a p0171 code. spark plugs,fuel injectors, throttle body, m.a.f.s., 02 sensors(all of them) changed vaccume hoses, fittings,the battery....nothing worked. everyone (including lexus) said that the fuel filter is a life time part. no need to replace. SO I DID IT ANYWAY. it was a pain to replace, and cost $60, but the light has never returned..... btw, i cut the filter apart and it was dirty. all for a $250 intake..geeze, how dumb am i.
01-05-11, 05:21 PM
#23
IT IS YOUR FUEL FILTER......maybe.... i had the same problem, and i replaced EVERYTHING. im telling you i spent close to 2k replacing parts related to a p0171 code. spark plugs,fuel injectors, throttle body, m.a.f.s., 02 sensors(all of them) changed vaccume hoses, fittings,the battery....nothing worked. everyone (including lexus) said that the fuel filter is a life time part. no need to replace. SO I DID IT ANYWAY. it was a pain to replace, and cost $60, but the light has never returned..... btw, i cut the filter apart and it was dirty. all for a $250 intake..geeze, how dumb am i.
01-05-11, 10:06 PM
#24
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IT IS YOUR FUEL FILTER......maybe.... i had the same problem, and i replaced EVERYTHING. im telling you i spent close to 2k replacing parts related to a p0171 code. spark plugs,fuel injectors, throttle body, m.a.f.s., 02 sensors(all of them) changed vaccume hoses, fittings,the battery....nothing worked. everyone (including lexus) said that the fuel filter is a life time part. no need to replace. SO I DID IT ANYWAY. it was a pain to replace, and cost $60, but the light has never returned..... btw, i cut the filter apart and it was dirty. all for a $250 intake..geeze, how dumb am i.
01-06-11, 08:07 AM
#26
OK, well it looks like it is definitely MAF related. I inspected for the 4th time, all of the vacuum hoses' fitment, and they were all tight. Then I removed them all to inspect and they were are in good condition.
So I go to swap out the MAF yesterday, and the screw that goes into the brass fitting on the intake pipe came out! It looks as though the previous owner overtightened it, so when I went to unscrew the 2 bolts, one came out with the brass fitting still attached tightly. I tried to break them apart using pliers in one hand and the allen wrench in the other. Looks like I'll have to get a new brass fitting and screw.
On a side note, literally as soon as I install the stock airbox assembly and fire up the car, the CEL was gone and the car drives normally.
Looks like this project will have to wait for a bit until I have more time.
So I go to swap out the MAF yesterday, and the screw that goes into the brass fitting on the intake pipe came out! It looks as though the previous owner overtightened it, so when I went to unscrew the 2 bolts, one came out with the brass fitting still attached tightly. I tried to break them apart using pliers in one hand and the allen wrench in the other. Looks like I'll have to get a new brass fitting and screw.
On a side note, literally as soon as I install the stock airbox assembly and fire up the car, the CEL was gone and the car drives normally.
Looks like this project will have to wait for a bit until I have more time.
01-06-11, 09:06 AM
#27
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because the added air from the new filter requires more fuel than your dirty fuel filter can supply. the maf will be a waste of time and money. quote me on that. unless you sprayed the whole can of filter oil on it, it wont be your prob. yea, it sounds great, no h.p. #'s but i do get about 2-3 more mpg.
01-06-11, 10:21 AM
#28
OK, well it looks like it is definitely MAF related. I inspected for the 4th time, all of the vacuum hoses' fitment, and they were all tight. Then I removed them all to inspect and they were are in good condition.
So I go to swap out the MAF yesterday, and the screw that goes into the brass fitting on the intake pipe came out! It looks as though the previous owner overtightened it, so when I went to unscrew the 2 bolts, one came out with the brass fitting still attached tightly. I tried to break them apart using pliers in one hand and the allen wrench in the other. Looks like I'll have to get a new brass fitting and screw.
On a side note, literally as soon as I install the stock airbox assembly and fire up the car, the CEL was gone and the car drives normally.
Looks like this project will have to wait for a bit until I have more time.
So I go to swap out the MAF yesterday, and the screw that goes into the brass fitting on the intake pipe came out! It looks as though the previous owner overtightened it, so when I went to unscrew the 2 bolts, one came out with the brass fitting still attached tightly. I tried to break them apart using pliers in one hand and the allen wrench in the other. Looks like I'll have to get a new brass fitting and screw.
On a side note, literally as soon as I install the stock airbox assembly and fire up the car, the CEL was gone and the car drives normally.
Looks like this project will have to wait for a bit until I have more time.
Yahtzee!! Bingo!
01-06-11, 04:55 PM
#29
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I have a GS 400 and just installed the same K&N intake and got the same cel code. i cleared it for now, i bought the intake used. I also used some new hoses. I would hate to have to take this intake out, Sleeper so what is the issue what did it all boil down too?