cylinder misfiring in 08 LS460
03-07-22, 12:56 AM
#16
Ok so you really want to hear this? The problem I had with motor that I posted was never found. I did the whole dealership thing and they raped me for $3600. They couldn't figure it out and wanted another $4000 to dig into it deeper or should I say dig deeper into my pockets. Well I towed the car and brought it home. Found a motor online and did an engine swap at home. That was the solution to that problem but here's the kicker. I drove this engine for 6 months and again the exact same symptoms. Misfires in the same two cylinders. I changed out everything and when there was nothing left to change I took it to a local mechanic who said he might be able to fix it. He kept it for 7 months and I finally had to tell him he's not going to be able to fix it. Brought it home and my neighbor started researching and reading up and one morning he asked me if I checked and replaced yhe head gasket. I never did that and the other mechanics never did that either. I run and order one and the next day tore down the car and swapped out the gasket. Son of a ***** fired right up with no hesitation. Didnt believe what I was seeing so I slowly drove to the freeway and dam son of a ***** starts hauling *** like it was lightning or something. Went through 2 engines and every part and 2 mechanics from dealerships and to find out it was a $80 head gasket. Dam lexus guys didn't even know what the f@^$# they were doing. I hope this will help you out in any way. There are some other things you can try but if its the same cylinders over and over again the check your head gasket.
03-07-22, 10:50 AM
#17
Driver School Candidate
Exact same problem on both engines! That's correct! I swear on my children's lives. It's so strange and so puzzling. I'm pretty sure that lexus doesn't train and hire mechanics that don't know what they are doing or just hire really smart and sneaky service advisors to up sell and add on hours to a labor ticket and not fix the problem right away but to milk the customers cause it's a lexus customer and they have money. Well back to the engine. I drive my car really hard. The first time the car started misfiring was when I was pushing hard on the freeway at around 110mph and the second time it was probably the same driving conditions so the blown head gasket does sound like the obvious problem but was never looked at. True to life and swear it was the same exact issues on both engines. Anybody with doubts come and see for yourself if you want.
03-07-22, 02:47 PM
#18
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Ok so you really want to hear this? The problem I had with motor that I posted was never found. I did the whole dealership thing and they raped me for $3600. They couldn't figure it out and wanted another $4000 to dig into it deeper or should I say dig deeper into my pockets. Well I towed the car and brought it home. Found a motor online and did an engine swap at home. That was the solution to that problem but here's the kicker. I drove this engine for 6 months and again the exact same symptoms. Misfires in the same two cylinders. I changed out everything and when there was nothing left to change I took it to a local mechanic who said he might be able to fix it. He kept it for 7 months and I finally had to tell him he's not going to be able to fix it. Brought it home and my neighbor started researching and reading up and one morning he asked me if I checked and replaced yhe head gasket. I never did that and the other mechanics never did that either. I run and order one and the next day tore down the car and swapped out the gasket. Son of a ***** fired right up with no hesitation. Didn't believe what I was seeing so I slowly drove to the freeway and dam son of a ***** starts hauling *** like it was lightning or something. Went through 2 engines and every part and 2 mechanics from dealerships and to find out it was a $80 head gasket. Dam lexus guys didn't even know what the f@^$# they were doing. I hope this will help you out in any way. There are some other things you can try but if its the same cylinders over and over again the check your head gasket.
03-07-22, 02:57 PM
#19
Pole Position
Was the intake manifold replaced along with the motor?
03-07-22, 02:59 PM
#20
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That's crazy to hear, head gaskets going on a Lexus motor is unheard of unless the engine is overheated, or so I thought. My issue, however is not coming from a specific cylinder. To provide some background info, I this all started when I got the p0012 for camshaft position retarted. As stated in the forums and from what I found online I replaced both the camshaft actuator motor, and the VVT solenoid. However this took me a few months fo do. Before, I replaced these parts the misfires started to occur, only at cold starts it would be a random misfire and multiple cylinder codes with different cylinders at every cold start. Once the engine was warm i could erase the codes and drive all day and would have no issues. Also, during this time, I got a p010f code only once which was referring to MAF sensor. I cleaned both sensors and even replaced them to see if the problem was fixed but it wasn't, after this the MAF code never returned. Long story short, the camshaft code never returned after the motor was replaced, and the misfire is still happening. A few theories I had were maybe the camshaft motor was not replaced in time which caused the problem to get worse or even timing to get affected. As the mechanic who installed the camshaft actuator said my timing chain was way too loose then it should be?!?!? I couldn't believe it but he did show me and there was some slack in it. Do you guys think that would be possible? If it were a timing issue wouldn't the engine be misfiring all over the place regardless of if it was warm?? Also, does anyone know if the LS motors chain is supposed to have some slack in it compared to other engines? I'm so confused over all this, I hope to hear back from the dealer tomorrow and am hoping for somewhat good news! Not trying to have to put another motor in this car.
03-07-22, 03:03 PM
#21
Pole Position
My point is a leaky manifold would cause misfire and MAF error codes. But it seems that you know better what is wrong with your car.
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03-07-22, 03:13 PM
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I agree with what you're saying, my apologies if I came off as a bit rude. I guess the dealership will have to figure this one out. They haven't asked for anymore in fees besides the $190 diagnostic fee. It's been three days since I dropped it off and they gave me a loner in the meantime. I will update here once I hear back.
03-07-22, 04:00 PM
#23
Instructor
03-07-22, 04:59 PM
#24
Pole Position
Let us know what the dealership comes back with.
03-08-22, 03:26 AM
#25
Driver School Candidate
That's crazy to hear, head gaskets going on a Lexus motor is unheard of unless the engine is overheated, or so I thought. My issue, however is not coming from a specific cylinder. To provide some background info, I this all started when I got the p0012 for camshaft position retarted. As stated in the forums and from what I found online I replaced both the camshaft actuator motor, and the VVT solenoid. However this took me a few months fo do. Before, I replaced these parts the misfires started to occur, only at cold starts it would be a random misfire and multiple cylinder codes with different cylinders at every cold start. Once the engine was warm i could erase the codes and drive all day and would have no issues. Also, during this time, I got a p010f code only once which was referring to MAF sensor. I cleaned both sensors and even replaced them to see if the problem was fixed but it wasn't, after this the MAF code never returned. Long story short, the camshaft code never returned after the motor was replaced, and the misfire is still happening. A few theories I had were maybe the camshaft motor was not replaced in time which caused the problem to get worse or even timing to get affected. As the mechanic who installed the camshaft actuator said my timing chain was way too loose then it should be?!?!? I couldn't believe it but he did show me and there was some slack in it. Do you guys think that would be possible? If it were a timing issue wouldn't the engine be misfiring all over the place regardless of if it was warm?? Also, does anyone know if the LS motors chain is supposed to have some slack in it compared to other engines? I'm so confused over all this, I hope to hear back from the dealer tomorrow and am hoping for somewhat good news! Not trying to have to put another motor in this car.
there was an internal gear or some part that might have failed and caused the chain to skip timing but that wasn't the issue either. On your car that just might be the issue due to the slack that you have but you are also right about throwing codes all I've if it was the chain. On the other hand the codes you are getting lead me to think its the chain being loose. Not 100% sure but an educated guess is better than any guess my lexus mechanics had. Good luck and let me know how it turns out. I've had two engines and I've been through it. My thing was when my engine gave out I swapped it and took the engine out disconnecting the tranny and the headers from the engine and connecting the new one. Well with the blown head gasket I left the old head gasket on the headers and put them on the new engine. Well it was a tight seal until time took its toll and the exact same symptoms occurred.
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