just bought a 2002 lexus sc430 the car is nice but i have been reading in regards to the throttle lag. Any resolution for this. I've read that the apexi or blitz trottle control is an option to work with the lag.
View 14 RepliesIssue on my wife's 2002 SC430. Recently ran into the well-documented disappearing acceleration caused by one of the trifecta of sensors on the throttle (TPS, APPS, and Throttle motor). Replaced the throttle position sensor and seemed to resolve issue. As of about a week ago, however, the car has developed a hiccup that I can't diagnose. Here's what I've recorded and done so far:
Symptoms:
-Hesitation at 1800 or 2300(?) RPM under light throttle and increasing load (often on uphills).
-Throttle down-blip of 100-200 rpm momentarily, only lasts ~1 sec
-Noticable lurch to vehicle, slows down slightly, results in 0.08G accelerometer reading when kicks back in.
-Change in engine exhaust sound as if in C-gate gears on a downhill (sounds like engine braking).
-Sometimes happens repeatedly in quick succession - up to 8 times in 10 seconds.
-Not speed dependent
-Overall performance is fine, not sluggish or hesitating when you stomp on it.
-Intermittant issue, not replicable, happens at random.
-No error codes thrown, no CEL, no DSP lights.
-Consistent -14.7psi vacuum registering on OBDII
Actions taken:
-Recently replaced and tuned throttle position sensor
-Seafoam on a nearly empty tank for 3 mi, half-full tank for 40mi
-Italian tune-up
-Disassembled and cleaned MAF
-Cleaned air filter (K&N)
-Reset computer (battery grounded for 10 min)
So... the question is, what the heck is this? Here are a few thoughts of what to do next in order of easiest/most likely/least expensive:
-Remove ABS relay and check performance (maybe TCS is hitting brakes a little?)
-Check all vacuum lines
-Seafoam cleaning through vacuum lines
-Remove, disassemble and clean TB assembly
-Test continuity on throttle body motor
-Test continuity on VVT solenoids
-Test continuity on full range of APP Sensor
-Replace VVT filters
-Replace VVT solenoids
-Check spark plug torque?
Ever see the round plug on top of the throttle body pop out and leak coolant?
View 1 RepliesI have 2002 SC430 with an annoying vibration through the seat/chassis at 60mph but she's smooth at 55 and slower and at 65+ mph ? Things I have tried so far ...
wheel balance
wheel alignment
2 rims rerolled that were out of round
bushes and suspension all checked
moved wheel positions front to back etc
Thinking now maybe driveshaft or uni joints ? or new tires but that's an expensive exercise !!
My brake light and ABS lights appeared today on my '02 SC430. What this might mean and the solution?
View 4 RepliesNoticed the antenna did not go all the way down. It will also not go up. When I turn the radio off the motor grinds for few seconds but the antenna does not go all the way down. Mast problems? Any links how to fix it?
View 14 RepliesOn my 2002 SC with 51K miles, the front end is squeaking. BTW, shocks are good...
View 6 RepliesMy check engine light came on.. so I took it to express tires.. And they said that they need to replace my vacuum hoses cause it busted ... well when I saw the guy used the obd checker thing.. after checking the codes.. i saw that when u turned on the engine.. the vsc on and vcs off lights came on..
So I figured after he fixed the problem.. it will go off.. well after he got done.. fixing the problem.. I drove away.. after bout like 2min.. i had to turn around cause the vsc on and vsc off came on.. and I told the guy to check.. And he used his checker.. and there was no problem.. and the "check engine" light is not on anymore.. just the vsc on and vsc off!!
Could the checker.. messed it up??? the vsc off button.. only works when the key is turned on.. " not when the engine started but right before it.. when the power comes on" so the button is working correctly.. it just comes on.. when i start driving the car...
And no they did not check my tire pressure or do anything to the tires or the wheels.. it just turned on.. when he inserted the obd thing to check..
And yes I read the [URL] .....
Is it dangerous to be driving with the vsc and vsc off light on??
I recently got into my 2002 SC430 and could not shift the car out of park. In addition, another symptom was that when I pressed the brake pedal, my rear brake lights would either come on momentarily and then turn off (looked like a strobe-light effect), OR the rear brake lights would not come on at all (the taillights, however, continued to function).
The only way to get around this issue was to use the manual override (by taking out the little plastic tab on the shifter and using a screw driver to press the hidden button, which would momentarily override and let me shift).
After much research, I found out that my Brake Switch/Sensor was failing (this is what tells the car's computer that you're pressing the brake pedal, and thus allowing you to shift out of Park). Unfortunately, I don't have the model number handy.
My non-Lexus mechanic charged me $100 (parts and labor) to replace the Brake Switch/Sensor. I'm not sure how much the actual part cost, but it couldn't have been much. It's a very scary feeling when you need to drive somewhere quick and you cannot shift out of Park.
I had to replace the ECU on my 2002 sc430. Although the original ECU was malfunctioningthe car started and was drivable (but the speedometer and odometer did not work, nor did the power steering). Following installing a used ECU, the car will now not start. I reset the ECU following the directions posted by others in this forum (both the gas pedal method and removing the fuses), but that has not fixed the problem. Do I need to have the dealer sync the key to the new ECU?
View 6 RepliesI have a 2002 SC 430 with 68,000 miles on it. Having problems with the transmission? Today, I could not go forward in any gear...could go in reverse. I turned off the ignition and re-started the engine, then the car worked fine.
Tonight I went out and the car was fine. However, later had the same problem.
I just purchased a 2002 sc430 and the steering was nice and solid. It needed new tires, so I purchased them at tire kingdom. they told me I needed a steering flush (lexus did as well at my oil change) so I to0ld them to do the flush. When I got my car back, the steering was so flaty, I have to keep my hand on the wheel all the time, they gave me an upgraded tire, to the falken, felt a little smoother but still floaty. brought it to lexus, they said it was the tires. the rear needed 255 and front 245. they upgraded the tires again and I still have the floating steering wheel.
View 3 RepliesThis week I began experiencing operational problems with the mark levinson stereo and I'm looking for a logical next step to resolve
1). I cannot adjust the volume either from the volume **** or from the steering wheel. I have volume I just cannot adjust it.
2). I cannot eject any of the CDs. I can play them.
3). Tapping the tuner **** should take you into stereo setup where you adjust bass, tremble, fade etc. when I tap it there is no response.
I can tune the radio fine. I can play the CDs fine. It does not appear to be fuse related
I called a car stereo guy who rebuilt my dried out speakers today and he suggested disconnecting the negative battery connection and touching the positive connection and that might reset it. That sounds scary to me and I do not want to harm any other components (or me!) by trying this. Any logical next step to resolving??
I am the original owner and all these symptoms happened at once and started after car sat in garage for a week. It has a new battery installed last year and shows no sign of a weak battery
Recently purchased an 2002 SC430 and have an error on Navigation System which states the following...
DVD
UNABLE TO READ DATA
CHECK IF MAP DVD IS CORRECT
Dealer thinks it an internal failure at navigation ECU. Estimate for repair $1,256.00 OUCH..
I'm having some trouble regulating the cabin temp in my 2002 SC430. It's cold outside here in Atlanta (in the 30's in the morning) and for some reason even when I have the temp set on 66 (not in auto mode) the cabin gets really hot! If I drop it to 65 the AC comes on. It's just weird.
Not sure where the temp sensor is located (will check the manual for that) but having a problem regulating the cabin temp. If put it the auto mode -- it ramps the fan up to high and cooks us all inside the car.
What is the location of the Thermostat the for 2002 SC430. Any pictures and/or diagrams ....
View 1 RepliesI have a 02, sc430. Modded with blitz supercharged and straight exhaust all the way..( accept the 2 catalytic converter before the o2 sensor.) But I have slight delay or lag during the first gear. From (rpm) 1k to 4k its delay or lag.(not revving smooth). But when its reach 4k and above, the power just kicks in suddenly.
View 6 RepliesGot in the car today, 2002 SC430, turned the key, car cranked and cranked but no start. I'm guessing I'm not getting fuel. How do I troubleshoot?
View 6 Replies'02 sc430 here and the oddest thing started happening this week. The trunk will not open when using the button on the driver's side. Push the button and I don't hear any activity. But if I use my key remote the trunk pops open as usual. At the exact time this problem started happening, the top stopped opening as well. I pull the cover back as usual in the trunk, make sure it clicks into place, but when I push the button to open the roof, it just flashes red on and off over and over as if the latch is not in place in the trunk. How this all started.
View 7 RepliesMy SC430 '02 has developed a problem with the VSC. Unfortunately it s not the light but the VSC engages at slow speeds. If I accelerate from low speeds, engine does not rev up and the VSC lights comes on. It works as if I was skidding and tries to correct the direction of the car. Just as it should if I was on ice or experienced aquaplaning, but I am on a dry road. I did a reset of the ECU, had the car at Lexus (they were able to duplicate my issue) for a zero-calibration. They found no problem with the sensors. All did not work. Presently I drive with the VSC disengaged. I do suspect the speed sensors to act up as I had Tein-Coilovers installed, but how can I get to the source of the problem?
View 12 RepliesI got 2002 SC430 with 59,000 Miles, all of the sudden my car doesn't have any acceleration at all. When I press gas paddle it doesn't do anything, but engine stay on. I couldn't get any error codes since I changed batteries to make sure if it wasn't the battery..
View 4 Replies