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GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

acceleration issues

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Old Sep 2, 2008 | 03:17 PM
  #1  
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Default acceleration issues

2002 GS300

When stopping then accelerating kinda fast, like at an intersection or stop sign, I get absolutely no power. Kind of dangerous if I'm trying to get out before traffic comes.

Was told it was the YAW sensor and had it replaced, but it still does it.

Seems like it will not down-shift correctly.

I played with it in a parking lot last night and sometimes it would do fine, squeel the tires . . . . and other times not.

I've also noticed that when moving in slow traffic there is a hesitation between 1st and 2nd. Also, if coasting downhill from a stop (no throttle) I get a hard shift from 1 to 2.

Any ideas as to what I need to look for? I've been told that Toyota transmissions are extremely dependable, but right now it I'm leaning toward something there.
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Old Sep 2, 2008 | 05:21 PM
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take it to a transmission place
have it checked out
maybe u need transmission oil or some thing
have them look at it !
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Old Sep 2, 2008 | 07:24 PM
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Yup. best place is to start with fluid. Drive around the city for about 10-15 minutes and then park the car with the engine idling. THEN check the dipstick to get a more accurate reading. Dont rely on the cold reading.
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Old Sep 2, 2008 | 08:11 PM
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Simple problem might be the transmission needing to learn your driving style and adjust the shift points. Try taking the EFI fuse and/or negative battery terminal for 15 minutes and then drive it hard. It worked for me a lot of times.
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Old Sep 2, 2008 | 09:45 PM
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Originally Posted by habeeb89
Simple problem might be the transmission needing to learn your driving style and adjust the shift points. Try taking the EFI fuse and/or negative battery terminal for 15 minutes and then drive it hard. It worked for me a lot of times.
? the GS can adjust its own shift points?
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Old Sep 12, 2008 | 05:29 PM
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Can anybody confirm this?
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Old Sep 12, 2008 | 06:24 PM
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Originally Posted by Rezaxxed
Can anybody confirm this?
I have to say... no way! It takes a tune to change shift points... I know Lexus is suppose to be special, but I dont think they're THAT special...
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Old Sep 14, 2008 | 10:55 AM
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repost: https://www.clublexus.com/forums/gs-2nd-gen-1998-2005/53128-acceleration-hesitation-problem.html

I had the same issue, bc I heard a rumor that the fuel grade didnt matter. Trying to save money will cost your more in the long run. As for the ecu changing to suit your driving style. I have to say its true, bc I drive the S outta this car. When I got it drove like it was in a parade.
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Old Jan 15, 2009 | 06:12 AM
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Would MAF malfunction be a factor? Shouldn't I get a CEL if so?
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Old Jan 20, 2009 | 02:20 AM
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Originally Posted by habeeb89
Simple problem might be the transmission needing to learn your driving style and adjust the shift points. Try taking the EFI fuse and/or negative battery terminal for 15 minutes and then drive it hard. It worked for me a lot of times.
I agree...I got my gs300 used and did this and it made the car feel more lively.
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Old Jan 20, 2009 | 05:39 AM
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I had another throttle body put on. Was told the other one was bad causing the delay. It did help, but I still get a throttle response delay. I notice it most easing around in a parking lot, in a subdivision with a lot of stop signs or in stop and go traffic. Sometimes, there's no delay and sometimes there is.

I think I'll replace the MAS (mass air sensor) and see if that helps.
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Old Jan 22, 2009 | 10:42 PM
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Default ?????

????? did you changed your break pad recently.
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Old Jan 23, 2009 | 01:22 PM
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Originally Posted by waxman
????? did you changed your break pad recently.
im missing why that would cause his loss of power after he stops....i mean unless the pads are sticking due to the rotors due to faulty/frozen calipers but that doesnt sound like what he's describing
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Old Jan 24, 2009 | 10:38 PM
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Originally Posted by GSteg
Yup. best place is to start with fluid. Drive around the city for about 10-15 minutes and then park the car with the engine idling. THEN check the dipstick to get a more accurate reading. Dont rely on the cold reading.
+1
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Old Jan 24, 2009 | 10:39 PM
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Originally Posted by captaincru
I had another throttle body put on. Was told the other one was bad causing the delay. It did help, but I still get a throttle response delay. I notice it most easing around in a parking lot, in a subdivision with a lot of stop signs or in stop and go traffic. Sometimes, there's no delay and sometimes there is.

I think I'll replace the MAS (mass air sensor) and see if that helps.
When the MAF sensor goes bad, CEL will come on.
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