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^^^Tom59, thanks for your input. What makes it tough, at least in my case, is the reproducibility of the vibration. Some drives, the vibration is more prominent than others and in best cases, it's barely there. I did put 91 octane gas a couple times from a local 7-11 and noticed more vibrations. My latest tank (91 octane) is on Esso fuel and is so far virtually vibration-free. I know you mention gas appears to be the same for all stations, but I tend to wonder now if there are the slightest differences in additional detergents and other additives among brands that may be a contributor. Or then again, it can just be differences in temps/humidity/commute/traffic... Tough one to really diagnose without having constant variables.
Anyway, I'm keeping a close eye on this latest tank of gas and will report.
availability of 93 in CT is really off the main point. I will say though it was my mistake earlier and in fact have been using 93, but, the vibration issue continues. Even if it was less or gone at 93 vs 91, that doesnt address the fact that the car is made to run on at least 91. It should not have an issue at 91. If we were running a lesser octane such as 87 and having issues, then that could be deemed our own fault. Anyways, like i said, 93 and still dealing with the issue. I would be open to disconnecting the battery, but, next Monday, the field tech specialist from Lexus is meeting me at the dealership. In speaking to customer service they reopened by case. I will keep you all posted. And Tom, I 100% agree with you. If a vibration was normal, every one of us would have it and you do not.
....I'm wondering if the fuel map is. Pull the ground wire on your NX let it sit for a half hour. Then re-connect the battery and drive it normally. See if it helps. You will lose some settings but you also might lose the vibration.
Nothing ventured , nothing gained. If mine was vibrating I'd do it....I am not sure what parameters the computers have as far as adjusting to temp - octane and humidity it must be somewhat extensive.
Gas or ethanol content isn't the issue. I've now tried two tanks of Shell V-Power 91 Octane (which contains no ethanol in Canada). Same vibrations at ~750 rpm. Will be making note of it at my 8000 km service this week.
Update. Reported the vibration at 750 rpm to the dealer during service appointment today. Verdict, "nothing abnormal". I suspected this would be the dealer's response.
Anyone contact Lexus higher up the food chain yet?
Yes, me. Without seeing the car, the FTS said its normal. I wasnt willing to accept that. Even my service advisor was shocked that the FTS didnt want to see the car. I called Lexus customer service and they reopened the case. I took it to the dealership so the FTS can see the issue. He felt the issue as did the service foreman. He immediately gave me every reason for it, engine under load, brake booster drawing vacuum, gas additives, maybe i just didnt notice it for the first 5,000 miles. We took out a loaner car which did the same thing. To me that didnt prove anything more than now there are 2 cars experiencing the issue. I knew it was going to be a fight of he said I said, so I decided this wasnt the time and he wasnt the person to push it with. I am going to see what happens when we get to the warmer temperatures of Spring since I am thinking maybe ambient temp has an affect (since this didnt happen until the temps got lower). It does seem to be worse the colder the outside temp is.
I believe I noticed this for the first time while driving to the Chevy dealer on Monday. Upon sitting at a stop, I let my foot off the brake and the car shook. Not bad, if anything, it felt like the car was running too lean and was starving for fuel. Just a little application of the pedal and the shake went away.
Even if I would have been keeping this car long term, I don't see this as an issue personally.
Got a a 2016 NX 200t, base model loaner today, with about 1100 km, and guess what? Engine also vibrates in the exact behavior. That is, as many owners have been stating here, vibration is felt immediately after you release the brake and stays there until you hit the gas or brake. It was a cold day (-6 C) and I do believe the colder air has something to do with it.
We can draw our own conclusions (or not), but I'm personally convinced this is a design, engineering, or manufacturing flaw and those who voted for "no vibrations" may not have been subjected to the environmental conditions that generates the vibration.
I have driven my NX200t (non F-sport) in temperatures as low as - 10 deg. C (14 deg. F) with no engine vibration as described here. Sample to sample variation may still be a possibility. Hope that you resolve your issue.
Can someone with the issue just unhook the battery for a half hour. Then hook it back up and see if it helps. I am almost positive this is the maps -fuel/air/timing....that would make sense it gets worse in cold weather also. I have a theory.
Try resetting it......CORRADO try it on the loaner...............see if they vibration changes.
Can someone with the issue just unhook the battery for a half hour. Then hook it back up and see if it helps. I am almost positive this is the maps -fuel/air/timing....that would make sense it gets worse in cold weather also. I have a theory. Try resetting it......CORRADO try it on the loaner...............see if they vibration changes.
Was already on the road returning the loaner at this time unfortunately.
Thing is the loaner only had 1100 km...
To note though, when I got my NX back today, it was smooth the entire drive and outdoor temps were warm for this time here +6 deg C.
If it roughs up again, I'll disconnect the negative terminal for a few mins...
Was already on the road returning the loaner at this time unfortunately.
Thing is the loaner only had 1100 km...
To note though, when I got my NX back today, it was smooth the entire drive and outdoor temps were warm for this time here +6 deg C.
If it roughs up again, I'll disconnect the negative terminal for a few mins...
I'm betting Lexus already has a fix and its a fuel map. But , who knows until you drive it for awhile. Engine management is the hardest thing to tune especially on a brand new engine. They might have never seen this issue during drive-ability testing.
I know when My Supra was tuned we drove in every possible condition while changing the maps to compensate it took us a while to get it nailed down. We also did dyno pulls for high boost maps. Lexus does the same thing on their vehicles. Constantly fiddling adjusting and getting the car perfect.
I know my car was tuned by the same guy that set up the Prius's. He has his own shop now.
....I'm wondering if the fuel map is. Pull the ground wire on your NX let it sit for a half hour. Then re-connect the battery and drive it normally. See if it helps. You will lose some settings but you also might lose the vibration.
Nothing ventured , nothing gained. If mine was vibrating I'd do it....I am not sure what parameters the computers have as far as adjusting to temp - octane and humidity it must be somewhat extensive.
Tom59, if i pull the negative, other than radio presets, what else will i lose? for example, I had the dealership custom some of the settings that only they can do, not the owner (ie-press and hold open button on remote to have all windows lower and sunroof open).
Tom59, if i pull the negative, other than radio presets, what else will i lose? for example, I had the dealership custom some of the settings that only they can do, not the owner (ie-press and hold open button on remote to have all windows lower and sunroof open).
if you purchase the Carista app and get a bluetooth ODB II scan tool, you can make all the changes the dealer could for customizations
plus, you can use it to read codes on the Lexus (or any car with an ODB port). Kind of a nice tool to have.
01-18-16, 04:18 AM
Engine management is the hardest thing to tune especially on a brand new engine. They might have never seen this issue during drive-ability testing. 