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Misfire Codes On Lexus RX350? - Car Talk - Nairaland

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Misfire Codes On Lexus RX350? by Whynow(m): 5:43pm On Jul 23, 2017
I have been experiencing something strange on my 07 Lexus Rx350.
From CEL caused by misfires codes jumping from 1 cylinder to 3 to 5 to 6 e.t.c.
I have changed up to 4 coils in space of 1 month
This morning cylinder 6 misfire popped up...... Not again I said.
Now I no longer believe its my coils acting up, but something else triggers the misfires

Other observations
Shakes whenever I start it in morning and smoothens
Whenever i rev the car ver high, its shakes /shudders and shuts off.
Trying to start it, it delays and cranks like i have a bad battery, which is not.
Then I perceive a carbon like smell.

I have installed new sets of NGK bought from amazon. So not plugs.

My mechanic says probably a bad injector or a fuel supply issue

Please I need advise
Re: Misfire Codes On Lexus RX350? by mayor2013: 6:25pm On Jul 23, 2017
Whynow:
I have been experiencing something strange on my 07 Lexus Rx350.
From CEL caused by misfires codes jumping from 1 cylinder to 3 to 5 to 6 e.t.c.
I have changed up to 4 coils in space of 1 month
This morning cylinder 6 misfire popped up...... Not again I said.
Now I no longer believe its my coils acting up, but something else triggers the misfires

Other observations
Shakes whenever I start it in morning and smoothens
Whenever i rev the car ver high, its shakes /shudders and shuts off.
Trying to start it, it delays and cranks like i have a bad battery, which is not.
Then I perceive a carbon like smell.

I have installed new sets of NGK bought from amazon. So not plugs.

My mechanic says probably a bad injector or a fuel supply issue

Please I need advise

A lot of things can be responsible for misfire. What other fault error do You have outside of a misfire. Could you expansive further on this carbon like smell. why do you keep changing are the older coils burning out

Things to check

Clogged up fuel injectors
Low pressure fuel pump Can be checked using a fuel pump pressure tester
Dirty airfiter
Clogged up throttle body
Worn out spark plugs
And many more

For you to clean up your fuel injectors. Make use of an fuel injector machine with ultrasonic bath

1 Like

Re: Misfire Codes On Lexus RX350? by Whynow(m): 6:30pm On Jul 23, 2017
Thanks bro
Please see as at July 5th.. Have changed the 3 and 4 coils.
Last week 1 and 2 came up ...changed.
Today 6 came up. This was where i gave up.
The carbon smell is when I rev the engine and the car shut off......

The O2 sensors code has been there long before, so its not the problem.

Re: Misfire Codes On Lexus RX350? by mayor2013: 6:33pm On Jul 23, 2017
You have a random cylinder misfire. Check 02 sensor and replace. That is responsible for your black smoke being emitted from the exhaust. Did you use the recommended spark plugs
Re: Misfire Codes On Lexus RX350? by Whynow(m): 6:54pm On Jul 23, 2017
mayor2013:
You have a random cylinder misfire. Check 02 sensor and replace. That is responsible for your black smoke being emitted from the exhaust. Did you use the recommended spark plugs
There is no black smoke sir my engine steams beautifully from exhaust.
The O2 sensor is downstream, and is heated type which really should not be a problem. I stand to be corrected.
Yes I used the recommended plugs

The O2 code is pending because I cleared the codes, it will come out as current ..
Re: Misfire Codes On Lexus RX350? by GAZZUZZ(m): 7:32pm On Jul 23, 2017
what we're the codes that prompted you to replace the coils?
Re: Misfire Codes On Lexus RX350? by Whynow(m): 7:50pm On Jul 23, 2017
GAZZUZZ:
what we're the codes that prompted you to replace the coils?
P0303,P0304, e.t c
Re: Misfire Codes On Lexus RX350? by awiriwa: 7:53pm On Jul 23, 2017
Bros, just check your catalyst (along the exhaust line). Looks like it's blocked. Also, feel the gear section inside the car when moving, if it feels hot...bingo, the catalyst is blocked. That's what is most likely killing off your coils.

2 Likes

Re: Misfire Codes On Lexus RX350? by GAZZUZZ(m): 8:06pm On Jul 23, 2017
Whynow:

P0303,P0304, e.t c

can I have the old coils? grin
Re: Misfire Codes On Lexus RX350? by Whynow(m): 8:07pm On Jul 23, 2017
awiriwa:
Bros, just check your catalyst (along the exhaust line). Looks like it's blocked. Also, feel the gear section inside the car when moving, if it feels hot...bingo, the catalyst is blocked. That's what is most likely killing off your coils.
That particular catalytic converter has been replaced. The old one was black with the ceramic cracked inside.
It was also checked last week, and the netting was perfect, no sign of blockage.
Re: Misfire Codes On Lexus RX350? by Whynow(m): 8:09pm On Jul 23, 2017
GAZZUZZ:


can I have the old coils? grin
How humorous...I asked for advise .
BTW, I am not buying them on my own, a mechanic did after checking the coils
Re: Misfire Codes On Lexus RX350? by honmusa(m): 8:13pm On Jul 23, 2017
Whynow:
I have been experiencing something strange on my 07 Lexus Rx350.
From CEL caused by misfires codes jumping from 1 cylinder to 3 to 5 to 6 e.t.c.
I have changed up to 4 coils in space of 1 month
This morning cylinder 6 misfire popped up...... Not again I said.
Now I no longer believe its my coils acting up, but something else triggers the misfires

Other observations
Shakes whenever I start it in morning and smoothens
Whenever i rev the car ver high, its shakes /shudders and shuts off.
Trying to start it, it delays and cranks like i have a bad battery, which is not.
Then I perceive a carbon like smell.

I have installed new sets of NGK bought from amazon. So not plugs.

My mechanic says probably a bad injector or a fuel supply issue

Please I need advise
check the fuel pressure and intake leak detection test. stop throwing parts at problem ,go for diagnosis that will accurately pinpoint cause of the misfire
Re: Misfire Codes On Lexus RX350? by mayor2013: 8:44pm On Jul 23, 2017
Lastly get a professional to handle this problem. Why not use money used in buying coils to Pay a professional to get the job done properly
Re: Misfire Codes On Lexus RX350? by Whynow(m): 8:49pm On Jul 23, 2017
mayor2013:
Lastly get a professional to handle this problem. Why not use money used in buying coils to Pay a professional to get the job done properly
Okay thanks....
Pls do you know any reliable Lexus tech around Gbagada area ?
Re: Misfire Codes On Lexus RX350? by mayor2013: 8:52pm On Jul 23, 2017
Whynow:

Okay thanks....
Pls do you know any reliable Lexus tech around Gbagada area ?

Kidnap this man here

https://www.nairaland.com/honmusa
Re: Misfire Codes On Lexus RX350? by Whynow(m): 9:15pm On Jul 23, 2017
mayor2013:


Kidnap this man here

https://www.nairaland.com/honmusa
Tx a lot
Re: Misfire Codes On Lexus RX350? by Bizzyliss(m): 9:47pm On Jul 23, 2017
awiriwa:
Bros, just check your catalyst (along the exhaust line). Looks like it's blocked. Also, feel the gear section inside the car when moving, if it feels hot...bingo, the catalyst is blocked. That's what is most likely killing off your coils.
I suggest this too
Re: Misfire Codes On Lexus RX350? by timifakay(m): 10:34pm On Jul 23, 2017
Whynow:

There is no black smoke sir my engine steams beautifully from exhaust.
The O2 sensor is downstream, and is heated type which really should not be a problem. I stand to be corrected.
Yes I used the recommended plugs

The O2 code is pending because I cleared the codes, it will come out as current ..

All O2 sensors have a heater circuit because the exhaust gas temperature is not high enough for the sensor to read so it needs extra heating up.
Re: Misfire Codes On Lexus RX350? by boldx(m): 7:37am On Jul 24, 2017
other observations
Shakes whenever I start it in morning and smoothens
Whenever i rev the car very high, its shakes /shudders and shuts off.
Trying to start it, it delays and cranks like i have a bad battery, which is not.


1. Did you buy bad fuel somewhere?
Seems your fuel line has dirt/water.

2. Clogged up fuel injectors***

Please run a live data scan on your car and also check the 02 sensor voltages, STFT and LTFT? Take the screenshots and post here.


Please be more open minded. We are only here to help. My car engine is V6 Toyota so I am running through issues I have had on my mind.
Re: Misfire Codes On Lexus RX350? by Whynow(m): 12:28pm On Jul 26, 2017
boldx:



1. Did you buy bad fuel somewhere?
Seems your fuel line has dirt/water.

2. Clogged up fuel injectors***

Please run a live data scan on your car and also check the 02 sensor voltages, STFT and LTFT? Take the screenshots and post here.


Please be more open minded. We are only here to help. My car engine is V6 Toyota so I am running through issues I have had on my mind.


Will do. Tx
Re: Misfire Codes On Lexus RX350? by sooperrescue(m): 11:45am On Jul 27, 2017
Unleaded Regular doing its stuff. Don't bother changing anything, just look for good octane booster and you will be free from this wahala. Try Shoprite
Re: Misfire Codes On Lexus RX350? by sholarb(m): 10:36pm On Jul 27, 2017
sooperrescue:
Unleaded Regular doing its stuff. Don't bother changing anything, just look for good octane booster and you will be free from this wahala. Try Shoprite

Hi Sooperrescue, how often do you recommend the use of octane booster?
Re: Misfire Codes On Lexus RX350? by sooperrescue(m): 11:02pm On Jul 27, 2017
Everytime you buy fuel, add 2 bottles and after the third fill up, use a bottle continuously at every fill up . The car will balance up and be on the move again. The difference between a toyota and Lexus is the fuel.
Re: Misfire Codes On Lexus RX350? by Whynow(m): 11:51am On Aug 10, 2017
Fixed!
Clogged fuel filter, and pump had low pressure. So bought a complete one N30,000 from my dealer at Ladipo.

To add to that , I also cleaned my MAF with this which I bough of Konga

On Konga , search for Liqui Moly Air Flow Sensor Cleaner - 200ml

Hope this helps someone.
Re: Misfire Codes On Lexus RX350? by ugreat(m): 1:50pm On Aug 10, 2017
Whynow:
Fixed!
Clogged fuel filter, and pump had low pressure. So bought a complete one N30,000 from my dealer at Ladipo.

To add to that , I also cleaned my MAF with this https:///liqui-moly-air-flow-sensor-cleaner-200ml-2869338?___store=default

Hope this helps someone.

Thanks for coming back to update us so we can learn?
Re: Misfire Codes On Lexus RX350? by boldx(m): 3:53pm On Aug 10, 2017
boldx:



1. Did you buy bad fuel somewhere?
Seems your fuel line has dirt/water.

2. Clogged up fuel injectors***

Please run a live data scan on your car and also check the 02 sensor voltages, STFT and LTFT? Take the screenshots and post here.


Please be more open minded. We are only here to help. My car engine is V6 Toyota so I am running through issues I have had on my mind.



Thanks for the update. Well done.
Re: Misfire Codes On Lexus RX350? by Famocious(m): 12:18am On Aug 21, 2019
Nice piece

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