Lexus SC430 :: Power Loss Then Restored When Accelerated?
Dec 2, 2015
Just curious about power loss issue that occurred yesterday.
I have a lengthy commute and in the afternoon drive home I get into a great deal of stop and go rush hour traffic. Yesterday about a fourth of the way in as I was slowing down the red battery light came on, the radio stopped, and interior lights dimmed, ie a general loss of power. As soon as I hit the accelerator all the power was restored. This occurred frequently the rest of the commute, but the loss of power became worse. There was never a hint that the engine was going to stall.
I assumed it was likely my battery going bad and that the car would likely not start this morning and I would jump it and get the battery checked. However, I had a full power crank. The drive to work does not have the stop and go, thus I only had to stop at a few red lights, and there was no power loss, until just as I arrived at work, the radio went off and came back on, but no battery light or anything like that.
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When I take off from a start it will intermittently stumble or hesitate, seems to be around 1500 rpm. have also noted it at higher speed while cruising. its more like a momentary power cut than a miss fire.
So far I have done the following
new fuel filters
clean MAF
new PCV valve
new spark plugs
check all hoses and plugs etc
injector clean
checked techstream for codes. there is one for a heated O2 sensor but dont think thats it.
2002. SC430
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So I've been taking apart my 06 GS430 for about a week now. Dealing with all the small kinks I'd like to get out of the way.
One major and possibly costly fix are my headlights. Since I purchased the car back in 2012 the headlight lenses were slightly cracking on the inside but not so bad. Though now it's more noticeable than ever and it's really bugging me. I've never had an experience taking headlights apart nor do I have the talent to do so. I'd probably go to a friend that does this type of stuff..
My question before I end up spending an arm and a leg on new headlights. Can these be restored in any way?
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Where the license plate lights get thir power from? I have a 2002 SC430 and the plug is just dangling. It goes behind the plate and then if I look under the car, it is just there by the bumper and I cannot find a connector that it can reach.
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From both the key remote and inside the car the power locks only occasionally respond. Currently most of the time just the driver side os working. Acts the same when the car is running and when it is off. Seems like the first time i hit lock or unlock it works but repeatedly doing it it stips moving the lock. Bad relay?
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Over the past few days driving my ls460 I've had a niggling feeling that something isn't quite right. The power delivery seems a bit inconsistent and although the engine sounds fine, I can feel something a bit 'rough' through the pedal.
At first I put it down to my imagination, but a few minutes ago I was driving along at a steady 40 and for a brief second the engine power cut right down and something flashed up on the screen along with a beep.
It happened so quick I couldn't have read it even if I were staring at the screen.
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The other night around 11pm my car lost power on the highway. I was traveling 80 MPH. The RPMs would not stay up no matter how much I pumped the gas pedal. The car did not die though. I would hold an idle, but felt like it was missing a little.I had the car towed to my hotel. Two days later I tried to drive the car to a mechanic. The car started up fine. It drove for about300 ft and stopped moving again. The car did not die and would hold the idle.Towed to the mechanic. It sat over a Monday holiday in his lot. On Wednesday I called to see how it was coming on the car. They put it on the computer and the only thing that came up was an engine misfire. They have been driving the car for 2 days with no incident.They have not done anything to the car as they don't want to throw money or parts at it not knowing what the car is doing. Feels like a fuel restriction but it idles. Stalling Lexus IS300...
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2002 ... I've been getting a soft engine fault all three lights on and reduced power. This usually occurs if I accelerate hard but also happens if I take a small pot hole in the front, a little bump seems to trigger it as well. Also engine resets to normal after removing key.
It's not logging the fault as had dealer read ECU and said was not logged.
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I recently purchased a used GS350 AWD.After purchasing it, I replaced all of the wheel bearing hub assemblies. The rear ones were grinding, and I decided to just do all 4 at the same time.
After swapping the hub assemblies, the slip indicator light comes on when I go 55+ mph. It's usually when I push on the accelerator. It's not always on. It goes on, then turns off for a while. Sometimes when accelerating it doesn't come on at all. When the light turns on, I loose power for a few seconds but I don't hear or feel any braking.
I have tried an alignment, reset the YAW sensor, etc. The mechanic had a very expensive snap on diagnostic computer and he said everything seems to check out. The steering angle is good, acceleration looks good.
I'm thinking that either one of the hub assemblies has a slight defect that affects the ABS sensors, my VSC computer needs replacing, or YAW sensor starting to go bad.
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2009 LS460 I have had my car at the dealer a few times for loss of power on acceleration. The last visit which lasted three weeks finally gave a diagnoses. The problem was confirmed by the dealer and the factory reps, a knock sensor picks up a signal that retards the timing resulting in no power, I was nearly run over by a semi the last time it happened. They tried to give me my car back on 7/24/14 with the knowledge that the problem is not fixable at this time but I should drive the car and they will tell me when there is a fix. I left the car at the dealer. I was also told that they had a few others with the same problem that could not be fixed.
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While driving to work this morning driving about 25 MPH and increasing speed gradually in traffic the lane I was traveling came to a sudden stop, I slammed on the brakes, ABS took over and I steered around the stopped lane of traffic with no issue. Here comes the problem, I never stopped rolling and traffic was coming up behind me in the lane that I just went in to and I stepped on the gas pedal and got nothing, truck was running, no lights or warnings just a dead gas pedal. This only lasted maybe 5 seconds and then it went but it was totally dead no matter how hard I stepped on the gas and vehicles were beeping at me from behind me. It finally went (5 seconds seems awful long when cars are approaching fast from behind) and it drove fine from there on. I guess I plan on trying to recreate this issue but thought maybe there is something with these trucks that caused this that I don't know about?
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My car is in the shop and has a leak at the Power Steering Pump. The rubber O-ring on the Power Steering Pump Solenoid Valve (p/n 4417030120) is leaking fluid. The Solenoid Valve is ok, just the Rubber O-ring is bad, but it looks like you have to buy a complete new Solenoid Valve to get the O-ring (a lotta bucks).
I did find a Lexus Power Steering Pump rebuild kit online at, but I can't see if it includes the solenoid valve o-ring or not. Have to replace their solenoid valve o-ring?
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I have been hearing a whine for a while now that has gotten worse. Today I was at a stoplight and there was a clunk from the rear and then the car lost about 1/2 of its power. I noticed the height level adjustment was blinking off. I shut the car off and it all went away after restarting.
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I have owned this car for six months. The car now has 39K. The problem is getting worse.
Re: Lexus 2011 LS460 AWD
Subject: Hesitation / momentary loss of power when accelerating after turn.
When accelerating after a sharp turn with light to moderate acceleration, the car will have a momentary loss of power for about 1, 2, or even 3 seconds. This does not happen often, but perhaps once every two weeks and I cannot replicate the problem despite attempting to do so.
In all cases, I am talking about DRY pavement. It always happens after a sharp turn usually to the right. (Probably because most sharp turns are to the right actually it only happened once on a left turn that I will describe below.) Acceleration is light to moderate NOT hard acceleration.
In one case it caused a serious situation. I had just purchased gas and was entering a busy freeway. When accelerating, the engine had a total loss of power for a couple seconds as a large semi truck bore down on me with its air horns blaring.
I have a strong clue that may debug this problem. Once, when turning left, the car suffered a total loss of power. There was no traffic and I kept my foot lightly on the throttle. The car remained unresponsive. The engine did not stop, but it did not respond and remained this way for at least 5 seconds until I took my foot off the accelerator and then back on to the accelerator. During this period of suspended throttle, I noticed that on the right side of the dash an orange alert symbol was flashing I think it was a swerving car? I assume this indicated that the car was losing traction and the computer decided to cut power until traction was regained. But the pavement was dry, and the acceleration was normal. In no case did I ever sense that one of the wheels was slipping.
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2008 GS460. 100K miles
I have noticed when I accelerate on a entrance ramp to the highway I notice the RPM meter jerks a little like it's trying to suck for gas or something else. I can feel it in the car too. This is the only time I have noticed this. I have replaced the spark plugs about 5K miles ago.
I did bring it into the dealership a few months ago to get the fuel pump replaced as I noticed a hissing noise under the drivers side read door. They said fuel pumps rarely go bad on the Lexus. The mechanic did some fuel pressure tests and said everything looks good. He also said noise is the return line back to the pump.
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I have a 2007 LS460 L. It has recently started losing electrical power in fraction of a second intervals. The map data sometimes works or displays an error on the screen. The radio has been functioning but now is also starting to flash off intermittently. Now when this happens it feels like the engine dies and ALL electrical is off and then power resumes. This affects steering, engine power and brakes. My wife drives this car and loved it until now.
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I have a 2003 Chevy Malibu, V6, 3.1, auto, 140k miles. Car started out with code 0420 with no noticeable symptoms, but then added code 0303 (miss fire cyl #3) with loud knock (mostly after warmup) and loss of power under load. Now internal loss of coolant (no puddles or external drips). Changed plugs and wires - no change - all plugs looked good with no sign of contamination. Questions - if this is a valve/piston/lifter problem (which would explain the knock, miss-fire and loss of power), why would I get the loss in coolant? If the loss of coolant is fouling plug #3 (which would explain the coolant loss, miss fire and loss of power), could that give me the loud knocking? I don't see how a valve/piston/lifter issue would cause a leak in coolant but I also don't see how a coolant leak into cyl #3 would give me such a loud knock. Do I have two different problems? If it is a leak into cyl #3, is there any way to tell if it is the intake manifold gasket (which leaked before and was replaced five-six years ago and which I could do again if I had to) or a blown head gasket (which I don't think I could fix or afford to get fixed)? Engine will occasionally get hot (but not overheat).
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I am still failing to appropriately diagnose the problem(s) with my '03 Ford E-350 7.3L Powerstroke. This van has only 69,000 miles on it. A week or two back (just a few days back in work time) it suddenly went from running perfectly smooth, clean and wonderful to this:
- Zero power. Putting the van in gear and flooring the engine causes lots more smoke not nearly any rev of the engine and just a crawl forward.
- Lots of smoke out the back exhaust, whitish. I cannot discern wether it smells like diesel or oil (because I'm ignorant here), but the smell is very strong.
- After warming up and idling ~ 15 min I check under the coolant cap and see no signs of bubbling or disruption (from opening the cap in the coolant tank).
- After warming up there are no warning lights visible on the dash, and I don't have a computer to read codes (if there are any to read).
- I replaced the turbo up-pipes which had a visible leak previously. This did not hurt the symptoms, though no more visual leaks under the dog house.
- I thought maybe I put gasoline instead of diesel in the truck, not so.
- To do the above test I had to use the fuel pump to get gas out the tank to test. I hijacked the fuel pump output and turned the car on a few times to get gas out to a tank. The pump seemed to work just fine.
This was all very sudden which is perplexing, and, in use, the van was previously an ambulette and in my few miles with it (maybe 200-300 only) use was extremely light for such an engine/van, just driving around doing errands. I am not sure if this is relevant (no one has suggested so, yet) but before all this happened I uninstalled the rear HVAC that came with the van when I bought it. The AC lines were sealed under the hood. The coolant line was returned at the doghouse (you can see this at the beginning of the video).
At the moment the van has no power to go anywhere. I have not yet checked the CPS or IPC sensors, and understand this might be the next route in standard troubleshooting?
2003 Ford E 350 7.3L Trouble - YouTube....
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I need to replace the ECM in an 02 SC430 my question is.......?
If i get my hands on a used one will I still have to Reflash the ECM or will the car start run and drive plug and play?
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New owner of a 2007 and 1st post. My antenna goes all the way up and then one of the sections retreats.
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The lexus sc430 is nice but when I floor it , there is a 2-3 second delay until she kicks down and really takes off. Someone said there is actually an adjustment on the transmission to eliminate this delay. Never heard of such a thing.
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