question on accel lag
#1
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question on accel lag
hio-
yes, i searched. and searched. and then a couple times more. issue is on a GS300, 1999, with ~178K miles. had the car about a year.
when i hit the pedal, i get a lag and then gas. it manifests as a lurch that is not at all acceptable in a luxury car. i tightened the cable to the point that the car had trouble shifting down when coming to a stop and then loosened the nut until it would shift down normally. there remains a touch of slack, which i would expect should be there.
so, i am starting to look for other ways to tighten things up. would a new TPS help? i am wondering if a tighter return spring might help the issue, but i'd rather find something i can try with a wrench before i try with a credit card. any suggestions are greatly appreciated.
TIA-
-e
yes, i searched. and searched. and then a couple times more. issue is on a GS300, 1999, with ~178K miles. had the car about a year.
when i hit the pedal, i get a lag and then gas. it manifests as a lurch that is not at all acceptable in a luxury car. i tightened the cable to the point that the car had trouble shifting down when coming to a stop and then loosened the nut until it would shift down normally. there remains a touch of slack, which i would expect should be there.
so, i am starting to look for other ways to tighten things up. would a new TPS help? i am wondering if a tighter return spring might help the issue, but i'd rather find something i can try with a wrench before i try with a credit card. any suggestions are greatly appreciated.
TIA-
-e
#2
hio-
yes, i searched. and searched. and then a couple times more. issue is on a GS300, 1999, with ~178K miles. had the car about a year.
when i hit the pedal, i get a lag and then gas. it manifests as a lurch that is not at all acceptable in a luxury car. i tightened the cable to the point that the car had trouble shifting down when coming to a stop and then loosened the nut until it would shift down normally. there remains a touch of slack, which i would expect should be there.
so, i am starting to look for other ways to tighten things up. would a new TPS help? i am wondering if a tighter return spring might help the issue, but i'd rather find something i can try with a wrench before i try with a credit card. any suggestions are greatly appreciated.
TIA-
-e
yes, i searched. and searched. and then a couple times more. issue is on a GS300, 1999, with ~178K miles. had the car about a year.
when i hit the pedal, i get a lag and then gas. it manifests as a lurch that is not at all acceptable in a luxury car. i tightened the cable to the point that the car had trouble shifting down when coming to a stop and then loosened the nut until it would shift down normally. there remains a touch of slack, which i would expect should be there.
so, i am starting to look for other ways to tighten things up. would a new TPS help? i am wondering if a tighter return spring might help the issue, but i'd rather find something i can try with a wrench before i try with a credit card. any suggestions are greatly appreciated.
TIA-
-e
Last edited by Sphan519; 03-08-15 at 10:31 PM.
#3
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thanks sphan, i will put it on the list.
did you notice any tears in your mounts after removal? i am wondering how much slop you noticed. my old land cruiser didn't seem to care if the motor mounts were torn or not, it just kept sloggin away. i'd expect more sensitivity to any slop in the lexus.
did you notice any tears in your mounts after removal? i am wondering how much slop you noticed. my old land cruiser didn't seem to care if the motor mounts were torn or not, it just kept sloggin away. i'd expect more sensitivity to any slop in the lexus.
#4
thanks sphan, i will put it on the list.
did you notice any tears in your mounts after removal? i am wondering how much slop you noticed. my old land cruiser didn't seem to care if the motor mounts were torn or not, it just kept sloggin away. i'd expect more sensitivity to any slop in the lexus.
did you notice any tears in your mounts after removal? i am wondering how much slop you noticed. my old land cruiser didn't seem to care if the motor mounts were torn or not, it just kept sloggin away. i'd expect more sensitivity to any slop in the lexus.
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interesting. i will definitely look into it.
in my thinking about this, does it make sense that i would only see the accel slack from a stand still, but not when i put my foot into it when already moving? i'd think i'd notice some slop with any significant acceleration, but i don't. thoughts?
in my thinking about this, does it make sense that i would only see the accel slack from a stand still, but not when i put my foot into it when already moving? i'd think i'd notice some slop with any significant acceleration, but i don't. thoughts?
#6
Also check with the car in park, push it forward and back, see if it moves substantially back and forth before catching.. which would indicate play in the transmission or diff....
I'm replacing my diff tomorrow... has a ton of play in it.... also causes a perceived lag type situation.
I'm replacing my diff tomorrow... has a ton of play in it.... also causes a perceived lag type situation.
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not motor or trans mounts. all are good and look relatively recent.
not transmission. in park, it doesn't move at all.
so, i grabbed an OBD reader for grins and tapped the gas to watch the TPS and AFM. turns out, i didn't get a consistent TPS response with every tap, and the AFM didn't respond a couple of times too. so, i am thinking i need to chase down electrical gremlins. i also notice the hesitation is much less common and i couldn't repeat it consistently today after all our rain blew out over the last day or so. i am wondering if maybe there is an electrical short somewhere.
anybody have a good source on a used TPS or AFM? it'd be good to try out a different set to see if that makes a difference before i drop the coin at the dealer.
thanks!
not transmission. in park, it doesn't move at all.
so, i grabbed an OBD reader for grins and tapped the gas to watch the TPS and AFM. turns out, i didn't get a consistent TPS response with every tap, and the AFM didn't respond a couple of times too. so, i am thinking i need to chase down electrical gremlins. i also notice the hesitation is much less common and i couldn't repeat it consistently today after all our rain blew out over the last day or so. i am wondering if maybe there is an electrical short somewhere.
anybody have a good source on a used TPS or AFM? it'd be good to try out a different set to see if that makes a difference before i drop the coin at the dealer.
thanks!
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#8
motor and trans mounts for hesitation.... interesting, is that because the slack that the torque of the motor and trans travel which we would feel as hesitation? trip if so because I know mine are both TOAST
#9
You might try contacting the dealer to see if the TPS is considered part of the throttle body assembly. It would be fixed for free because of this:
www.toyotaelsettlement.com/Home/FAQ
www.toyotaelsettlement.com/Home/FAQ
Last edited by sivikvtec; 03-15-15 at 05:20 PM.
#11
and by all means it is not fixed foe free for any reason at all lol..... I wish! unless of course you have some killer warranty lol... btw OP have you tried taking your OCV valve out and cleaning it as well as its screen? a def. culprit to our hesitation problems... as well as taking your throttle body off and cleaning the heck out of it and your mass air fs
#12
Obviously, this is only worth pursuing if OP is sure the TPS is bad.
Last edited by sivikvtec; 03-15-15 at 05:33 PM.
#13
Depends...Read the link and search in the performance subforum. People are getting throttle body assemblies replaced for free at the dealer regardless of age/mileage. Details are in the FAQ link I provided.
Obviously, this is only worth pursuing if OP is sure the TPS is bad.
Obviously, this is only worth pursuing if OP is sure the TPS is bad.
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its funny, it doesn't show a CEL, so i am a little surprised the TPS is acting up.
i will check into the suit. it might be worth it to have lexus diagnose the issue so i don't go chasing expensive sensors all around.
i had the throttle body cleaned out when i had the igniters done about a year ago. it was squeaky clean in there, so hopefully that isn't an issue at this point. we shall see...
i will check into the suit. it might be worth it to have lexus diagnose the issue so i don't go chasing expensive sensors all around.
i had the throttle body cleaned out when i had the igniters done about a year ago. it was squeaky clean in there, so hopefully that isn't an issue at this point. we shall see...
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its funny, it doesn't show a CEL, so i am a little surprised the TPS is acting up.
i will check into the suit. it might be worth it to have lexus diagnose the issue so i don't go chasing expensive sensors all around.
i had the throttle body cleaned out when i had the igniters done about a year ago. it was squeaky clean in there, so hopefully that isn't an issue at this point. we shall see...
i will check into the suit. it might be worth it to have lexus diagnose the issue so i don't go chasing expensive sensors all around.
i had the throttle body cleaned out when i had the igniters done about a year ago. it was squeaky clean in there, so hopefully that isn't an issue at this point. we shall see...
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