Lexus GX 2004-09 :: GX470 Engine Noise When Decelerating - RPM Drops
Sep 3, 2014
How to diagnose the engine issue I am having. The gx currently has 96k miles and I am planning on doing a timing belt and water pump replacement as I plan on keeping it as long as possible.
One new issue that crept up is that when going down the hill the car engine sounds like it's actually accelerating and the RPM drops to as if it was idling.
Normally when going down the hill it usually stays around 1 or 2 on the rpm, it's noticeably different and just started happening recently. What might be the cause of this?
View 8 Replies
Advertisement
Having bought my 06 GX 470 only a few months ago, we're encountering 90-degree-plus days for the first time. There is an unusually loud noise from the engine that I'm almost sure is cooling fan noise. It occurs after running in the heat of the day. It's not mechanical noise, but a loud roar like that of a large truck engine. Is this typical for these models in the heat?
View 10 Replies
06 GX470 muffler exhaling white smoke for a while, now the smoke disappeared, however, a new hissing engine noise is evident. The noise increases with the revolutions of the engine and it never stops.
View 13 Replies
Few weeks ago I bought my first Lexus, an '07 GX 470. It has roughly 75,000 miles on it, 2 previous owners before me. Anyway, I hear a noise sometimes which either sounds like a slight belt slip or fuel being pumped into the injectors when I give it a good amount of gas and the engine downshifts to accelerate. I had the dealer replace the drive belt(serpentine belt) because of 2 reasons, it needed to be replaced and I thought that could be the problem(I did not have to pay for it since I have had some problems with the Lexus dealership I bought it from, they did it as a "goodwill" gesture, that's a story for another thread) and inspect the tensioner and pulleys, they said the pulleys and tensioner were in good working order.
I drove the GX home tonight after said replacement, and I still noticed the same noise. The best I can describe it is like I said above, a slight belt slipping noise or it could also be described I guess as fuel being injected under acceleration as soon as the trans downshifts to accelerate. I am just curious if this is normal for this engine or do I have a possible problem? It's covered under the Lexus used car warranty for another 5 months so if there is something wrong, obviously I would like it fixed under warranty if something is wrong. One thing I should probably mention is, the noise is semi quiet and I guess the average person might not even notice it.
View 12 Replies
Have owned a 2014 LS460 since April. Ever since then, when accelerating decelerating between 1000 and 3000 rpm, we hear a whining and grinding noise.
View 9 Replies
I have a 2005 GX 470, I noticed a sound, like that of a belt being loose, the sound came from the front of the truck. A few minutes later the AC stopped cooling, it was blowing really hot air and then the temperature of the engine went really high. I stopped on the side of the road, when we opened the hood, the belt was not broken but there was antifreeze everywhere.
View 5 Replies
I have a 2006 GX 470 with 130,000 miles on it. Recently, when driving on long trips I have noticed that the SRS bag light will come on after we stop after driving for a while. To be a little clearer, the car will start normally when cold, all dash lights will go through their sequencing and turn off. We will drive for a distance which will be long enough to heat everything up, say to the mall or a restaurant.
When we return to the car and I start it all lights go thru their sequencing and the SRS light stays on. Next morning, after the car has cooled, everything is normal again. Lexus says it is the 89170-60241 sensor assembly that is $489.26 plus $310.95 in labor to replace. While I have owned the car I have successfully replaced the air suspension rear sensors and all the O2 sensors and recently did an engine swap with my son on his Toyota Supra so I think I can handle the repair. Where is the sensor located and how is it accessed??
View 2 Replies
Our 2004 GX has been a great car, but is suddenly doing a number of strange things - like not start. When I say it won't start, I mean you can turn the key, the dash lights up, the steering wheel adjusts, radio goes on, etc, but then NOTHING! No solenoid "click", no starter noise, NOTHING! Does not crank at all. The car just turned 60,000 miles, is in great shape, lives in the garage and has never been in an accident.
After the first couple of times it did this, had the battery replaced, as it was getting close. and then the car started again. Until the next day. No rhyme or reason as to when it would do this. It might start 10 times in a row, then NOT start for a while, then magically fire up instantly, even after several key turns. I wiggled the key, tried a different key, shifted to Neutral, wiggled the shifter to try to rule out security interlock, bad ignition switch and shift interlock. No dice.
Did some more research and thought it might be the starter relay - banged on it and it started, so replaced that part. Didn't solve the problem. It also began to randomly die while idling (in park, or in drive). Sometimes it would re-start, sometimes not. The times it has done this, it typically dies after running or 15-20 minutes, but NOT ALWAYS.... Sometimes it will die once, then be good for the rest of the day. Sometimes it re-starts immediately, after a few minutes, or more recently only after sitting for a few hours.. So basically we can't use the car.
View 14 Replies
I just purchased a used a Lexus GX470. The transmission seems to do something fairly consistently that seemed unusual to us, but we are new to this car so I'm not sure if it is normal, abnormal, or a sign of something big to come.
When starting from a complete stop, upon removing your foot from the brake, there is a noticeable mini-surge in the engine as the transmission engages, and the sensation seems to repeat when the transmission is disengaging as you brake to stop.
Does this sound normal? From searching on google, I have read that there are issues with "hard shifting" but this does not seem to happen with shifting...just when the transmission engages or disengages, and it isn't a big 'bump' as much as a mini-surge. I have also read where it could be related to something electrical such as the air conditioner.
The car is under warranty, but the service department notes no error codes when they scanned the engine.
View 14 Replies
New to my 2008 GX470. 100k miles. Love it so far. However I think I am hearing a intermittent rumbling as I drive down the road. It is like the rumble from a radio base sound. It could be normal road noise but I bet it is not.
I have replaced the left front axle (grease boot broken), replaced the rotors and pads, replaced all differential and transfer case fluids (not transmission yet) and inspected all the suspension parts.
View 8 Replies
I have a 2004 GX470; bought it new. The last few months I have been hearing a strange noise from the driver's side; seems to be coming from under the floorboard and can sometimes feel a vibration in the brake pedal. The noise is similar to a cat meowing. Have a son who is a GM tech; he said it sounds more electrical than mechanical. It happens mostly when I drive it cold. Seems to also happen more when turning/braking. I had the main belt replaced this summer. Should I have the tension pully replaced?
View 12 Replies
2006 GX 470, purchased CPO with 26K miles in March 2008.....my sunroof just made a horrific clicking noise upon opening last night, and the one-touch opening isn't working, I have to physically hold the button down in order for it to open all the way.
View 9 Replies
I have a problem with my gauges. Sometimes my RPM gauge works, and sometimes it doesn't.
When I approach the car and open the door, I hear a weird noise coming from the gauge cluster (or a nearby area). When I start the car, none of my gauges work, and you can see the temperature, speed, and fuel gauges flickering. After about 10 or 15 seconds all gauges fire up, except for the RPM gauge.
The flickering does not always occur, but my RPM gauge is dead most of the time. It works once in a while in the morning when I start the car, but once I shut down the car and start it again, I loose my RPM gauge the rest of the day.
I think the noise I hear behind the cluster or inside the steering wheel area has something to do with this problem because the cluster problem arouse when I started hearing the noise.
I managed to put the problem on video, and you may see it here. If you focus your attention on the fuel and temperature gauges right after I start the car, you will see the flickering. You will then see the needles jump to their correct readings about 15 seconds after the car starts, but as you can see the RPM gauge is dead.
YouTube : [URL] .....
View 14 Replies
2007 GX470 120,000 miles. Great vehicle and no problems until now. Seems I have an intermittent engine whine/whirring/zinging sound. I say intermittent because sometimes it there and other times its gone. It is fairly loud. Almost like an extremely loud alternator whine, only this sound is coming from the area near the ac compressor. There is some plumbing which runs just along the left side of the compressor pump and when I grab those lines and the little aluminum cannister in that area, I can feel the vibration in that system, big time. No vibration from the compressor pump though. Not sure what those lines are, but whatever they connect to is probably the culprit.
Its odd because the noise comes and goes. It doesn't fade in/out. It's either full blast loud, or totally gone. Once it's gone, it doesn't come back for a few days. Then one morning i go out and start the truck, and there it is again! Usually lasts for about a day, then it goes away for a week or so. After a week goes by, there it is again! Really odd. I had my mechanic look at it, but it wasn't making any noise that day (as luck would have it). He told me it was an awesome vehicle. Of course I agreed, but that didn't diagnose the problem.
View 3 Replies
For the past week, my wife's 2004 GX A/C has been blowing hot air off and on. At first I thought this was due to low refrigerant but after pressure testing it appears to be full. Yesterday afternoon I was driving the car home and the A/C was blowing cool air then suddenly stopped again, I happened to look at the engine temperature gauge and noticed it creeping to "H". I shut down the air all together, pulled over and it cooled. The gauge actually stayed below the half way point the rest of the way home, until I had to stop at a light, then it slowly climbed up to the "H" again, the lowered as I drove to a cruising speed 55MPH. One home, I looked at the coolant reservoir and there was no fluid in it (not sure if this is normal) and there was no sign of smoke or fluid leaking. Could this be a thermostat issue, radiator issue, loss coolant issue???
View 7 Replies
Have water on passenger side floorboard after a heavy rain or car wash. Seems to come from more the dash glovebox area than rocker panel. I'm aware of cleaning sunroof drains, don't think that's it.
I've removed the kick panel, can see drain, it's not too short like other post show. I realize it could be the windshield, but what about the cowl drains?
Now to the clicking noise. I hear it when AC is on recirculate, if I switch to fresh air, it stops. The temp outside or in, seems irrelevant.
View 4 Replies
2011 Corolla S, the RPM's drop by couple hundred suddenly when easing off the gas pedal. This is more noticeable at speeds of about 60-70mph. I got it checked out under warranty and the dealer said it is normal as the car shifting out of overdrive.
They may be correct in this as it is the speed around which the overdrive comes into play but it just does not feel right, although it may be related to the overdrive, they should have a fix so that the car slows down gradually, not suddenly.
I have read other TS-B updates which resolves the problem of fluctuating RPM's at steady speeds or the RPM not dropping when letting off the gas pedal, however my issue is slightly different in that the RPM's drop suddenly and then jumps back up again. I wonder if that same TS-B flash will resolve my issue.
View 5 Replies
Over the last few weeks I've been hearing what sounds like a failing pump of some sort when shutting off my '06 GX470. The sound lingers for just a moment after the ignition is cut off, and sounds like a loud, very fast tatatatatatatata. It doesn't always do this - sometimes I don't hear anything. I've been commuting in the GX for four years and I've only been hearing this intermittent occurrence over the last 3-5 weeks.
What this might be? Fuel pump? Air leveling suspension pump?
View 2 Replies
What is this noise? Video included... [URL]... This noise comes up after the engine gets warmed up and only when the car is decelerating or idle. That is, as soon as I take my foot of the gas pedal the car starts making this noise and it is very loud. No error codes.
View 3 Replies
My 2004 Golf GTI VR6 6-speed manual makes a louder than usual decelerating noise while in 2nd, 3rd, and 4th gears. If I give it gas it doesn't make any noise but once I take my foot off the pedal it makes a louder than usual decelerating noise. It sounds almost as if something is maybe grinding but I'm not sure what it is. One mechanic said it may just need to be serviced (new transmission fluid). I've read some forums saying it may be the bearings or maybe need a new transmission. The car runs fine otherwise and there aren't any problems shifting up, it shifts really smooth. '
Its only when I downshift that I hear the noise. The noise is the same no matter if I'm turning or going straight and and it's in neutral, there ISN'T noise. It's only while in 4th, 3rd, or 2nd while decelerating. Even if this is a common problem with VW's how do I fix it?! The previous owner said it's been the same way since he's had it and it has NOT gotten worse and his mechanic said it was nothing detrimental to the car so he left it that way. The GTI has 130K miles on it and runs strong, that's the only problem it really has. I'm not sure when the transmission fluid was last changed so that could be a possibility. Going to possibly try that in a few days and see what happens.
View 6 Replies
I believe my GPS is out of date. The DVD says North America version U20. Data version 05.1. Is this old? Is the newest DVD going to really work for me or can I buy last year's model?
View 2 Replies
