Hello all

can any one tell me what happen to my car
when i drive at highways , at 4000 rpm the car cuttings off and the same fire from exhaust comes ,

i replaced the fuel pump , air filters , all sparks plugs , clean all fuel injectors and the same problem still exist

 

Definitely a clogged fuel filter. Replace it and I bet that goes away.

 

If you mean the filter inside fuel tank , i replace it too and same problem

 

Well I'm glad we didn't bet money!

I thought sure that would be your problem, especially considering all the other things you said you did. My only other guess is something amiss with the timing.

Maybe if roadfrog or Kenny read this they may have a better idea.

 

"Backfiring" from the exhaust was historically due to an overly rich mixture (as oppose to backfiring from the carburettor, which was a valve timing issue). Of course, it could be a whole host of things in modern, computerized, fuel-injected, catalytic converter-containing cars. Is the check engine light on? I think it might be sufficiently complex to bite the bullet (and take it to the dealer).

 

Yup, you're right.

 

There should be codes. If not I would get on the phone and call all dealers and Toy Lexus indy shops and see if they could give you any clues.

 

Are the catalytic converters in place? Any modifications/

 

OP is this a new car to you?

I don't know about you guys, but that car seems like it's modified to intentionally back fire. Sounds like an aftermarket exhaust. Possible that there are no cats either since I feel like getting an LS to backfire with cats would be quite difficult.

I won't lie, it does look pretty cool. Reminds me of the new F-Type that back fires like it's nobody's business.
I do low key wish the LS rev matched/throttle blipped during aggressive driving.

 

Thank you Nospinzone

this problem was in the car from last year, but two weeks ago , check engine came on and there is a code P0031 maybe there is problem with O2 sensor , Bank1 Sensor1

The dealership refuse to take a look to the car because it was from another country !! , in Kuwait the dealership only take the car if i bought it from him.

last month i replaced the mufflers and clean the catalytic converters , because there was a sound inside the mufflers like it have been broken inside

i agree with you it does look pretty cool
but the problem is the car wan't get to 5000 rpm, it just keep cutting of and never goes above 5000 rpm
and also i noticed that the rpm not accurate

 

Sounds like your catalyst fell to pieces (or melted) and may be the cause. Pull them and see what they look like internally.

 

This was what I was going to post, that's why I wanted to know if they were even in place. The fact that the vehicle is in the Middle East only fuels (no pun intended), speculation on fuel quality, etc.

 

I remove the catalyst because it fell to pieces like what you say

 

The main problem was that at high rpm the car cutting off and won't shift up
the problem was exist before the check engine light comes on (P0031 HO2S Sensor low circuit)

so i don't think it is related

here is a video about the problem

 

I think you are just hitting the rev limiter