slow acceleration + little shaking from engine in low rpms
#62
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#63
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Talking about fuel pump, is ti regulated by the ecu? The ecu or something has a safety cut out for the fuel pump to prevent pumping in case of an accident [typically connected to the spark activity].
I am used to fuel pumps regulating themselves by maintaining line pressure [the more the demand the more they pump].
There was a post that I read implying the ecu is controlling the rate of pumping.
Salim
I am used to fuel pumps regulating themselves by maintaining line pressure [the more the demand the more they pump].
There was a post that I read implying the ecu is controlling the rate of pumping.
Salim
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The reason i ask this is because i found this link https://www.clublexus.com/forums/per...-pump-ecu.html i thought maybe i got that thingy also on the rx300
#65
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There is a regulator piece on the pump itself, but as far as something akin to what he is showing in that link to the Lexus SC, no. It's ECM in the glove compartment.
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This is the codes from this morning ...they say all the specs look okay but i have a feeling they dont have a glue about what they are doing ..they got the it2 tseter though im just not experienced enough to read it and neither are they ..they advice me today to change the plugs ..but to me seems like i have a faulty MAF sensor ?..ow btw they dont have plugs on stock also ..
#67
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This is the codes from this morning ...they say all the specs look okay but i have a feeling they dont have a glue about what they are doing ..they got the it2 tseter though im just not experienced enough to read it and neither are they ..they advice me today to change the plugs ..but to me seems like i have a faulty MAF sensor ?..ow btw they dont have plugs on stock also ..
Yes, the P0100 and P110 codes relate to the MAF, but make sure there is rubber O-ring seated beneath the MAF sensor, sometimes people forget that after cleaning it.
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Im sure the O-ring is there...does it make sense that i change MAF b4 sensors on bank 1 and 2 ..
My thinking was like if my MAF dont give correct readings the A/F sensors will ofcourse report fail since mixture aint correct ?
I see some mark "!" infront on A/F reports on the scanner do they mean anything special ?
Thanks for the reply Lexmex
My thinking was like if my MAF dont give correct readings the A/F sensors will ofcourse report fail since mixture aint correct ?
I see some mark "!" infront on A/F reports on the scanner do they mean anything special ?
Thanks for the reply Lexmex
#69
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The "!" means that a freeze frame was saved
Meaning it took a snapshot of a recorded parameter when the code occured.
Seeing they both were AF codes. Probably their voltages were out of range.
Fuel trims might be recorded also.
There should be a freeze frame data on that scan tool you have.
Those 2 codes for the MAF meter kinda bugs me. Usually an unplugged MAF with the key ON would trigger those codes.It's possible that when they were checking codes that they left the MAF unplugged.
Clear those codes and see if they come back.
But before that. See if you can post the freeze frames that were recorded. I'm curious.
Meaning it took a snapshot of a recorded parameter when the code occured.
Seeing they both were AF codes. Probably their voltages were out of range.
Fuel trims might be recorded also.
There should be a freeze frame data on that scan tool you have.
Those 2 codes for the MAF meter kinda bugs me. Usually an unplugged MAF with the key ON would trigger those codes.It's possible that when they were checking codes that they left the MAF unplugged.
Clear those codes and see if they come back.
But before that. See if you can post the freeze frames that were recorded. I'm curious.
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The IT2 scanner is not mine its from toyota they saved the file but i think im gonna find another workshop where they have the tool and someone that understands reading it.. the maf was plugged in 4 sure ..if i disconnect it car will stall and not run in idle..
I will try and see if i can get those data when i go there to pick up my airfilter ive been waiting for 2 weeks now ..should be in this week for sure
I will try and see if i can get those data when i go there to pick up my airfilter ive been waiting for 2 weeks now ..should be in this week for sure
#71
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Im sure the O-ring is there...does it make sense that i change MAF b4 sensors on bank 1 and 2 ..
My thinking was like if my MAF dont give correct readings the A/F sensors will ofcourse report fail since mixture aint correct ?
I see some mark "!" infront on A/F reports on the scanner do they mean anything special ?
Thanks for the reply Lexmex
My thinking was like if my MAF dont give correct readings the A/F sensors will ofcourse report fail since mixture aint correct ?
I see some mark "!" infront on A/F reports on the scanner do they mean anything special ?
Thanks for the reply Lexmex
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Update ...my problem seems to be closer to solution ... i got the fuel filter changed helped quite a bit with more respons from the throttle...today i changed the dogbone mounting it also helped mainly on the vibrating ...the mechanic who changed the fuel filter told that because the ridicolous quality of fuel here he often seen error codes on a/f sensors and since i guessed that the fuel filter never got changed i change that just to rule that thing out ....im going back to he workshop i a couple of days to see if the codes remain on the a/f sensors ...my guess is that the code will stay ...i tried to measure on the sensors since they should have a resistance between 0.8 - 1.2 "as i remember" at 20 degrees celsius and i get no reading from then when i checked so if im not wrong the problem was 3 things ..a partly cloaked fuel filter ..a broken dogbone mounting and the af sensors which still aint changed but the allover symptoms is a lot less now that the other things has been done
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Sensors didnt do the trick to get rid of the stagger i had ...culprit was fuel pump changed it and now ride is smooth ..i now its an old link but i hate ppl that dont finish the thread ..so in case anyone ends in same situation start with fuel pump
#75
Lexus Test Driver
Originally posted by Nad1370
Wow 4 pages already huh?
Let me take a "whack" at it. Lol J/K.
Since every possibility has been thrown at it.
How about a Fuel Pump?
A weak or clogged fuel pump would also cause a rough idle and low speed drivability problems. As you put load in the engine. The Ecu sees it and increases the voltage on the pump therefore no problems in higher rpms.
I see you have had A/F codes in each Bank so it's possible it's a fuel issue not just air alone.
Next step I would do is to check fuel pressure at idle and under load.
Wow 4 pages already huh?
Let me take a "whack" at it. Lol J/K.
Since every possibility has been thrown at it.
How about a Fuel Pump?
A weak or clogged fuel pump would also cause a rough idle and low speed drivability problems. As you put load in the engine. The Ecu sees it and increases the voltage on the pump therefore no problems in higher rpms.
I see you have had A/F codes in each Bank so it's possible it's a fuel issue not just air alone.
Next step I would do is to check fuel pressure at idle and under load.
Just made sense to me that it's a fuel issue more than and air or sensor would cause your problems.