Very light throttle hesitation/jerking
#17
Instructor
iTrader: (6)
Sounds exactly like my tps issue, had a brand new tps that was no good from toyota. took a year to figure it out until i hooked up a datalogger and seen no tps signal.
i used to be able to drive however long i wanted.... even 8 hours and it would not have issue. As soon as i started and restarted vehicle i got the light throttle jerking you speak of..... while trying to cruise it would buck back and forth but soon as i mashed the pedal it went away.
bet its tps....
i used to be able to drive however long i wanted.... even 8 hours and it would not have issue. As soon as i started and restarted vehicle i got the light throttle jerking you speak of..... while trying to cruise it would buck back and forth but soon as i mashed the pedal it went away.
bet its tps....
#18
Rookie
Thread Starter
Join Date: Jul 2013
Location: GA
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
Sounds exactly like my tps issue, had a brand new tps that was no good from toyota. took a year to figure it out until i hooked up a datalogger and seen no tps signal.
i used to be able to drive however long i wanted.... even 8 hours and it would not have issue. As soon as i started and restarted vehicle i got the light throttle jerking you speak of..... while trying to cruise it would buck back and forth but soon as i mashed the pedal it went away.
bet its tps....
i used to be able to drive however long i wanted.... even 8 hours and it would not have issue. As soon as i started and restarted vehicle i got the light throttle jerking you speak of..... while trying to cruise it would buck back and forth but soon as i mashed the pedal it went away.
bet its tps....
#20
Rookie
Thread Starter
Join Date: Jul 2013
Location: GA
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
Yes, it comes on with key-on engine-off and when I jumper E1 and Te1 it flashes repeatedly showing no codes. I even induced a code (unplugged MAF) to make sure the CEL was working correctly and it threw the corresponding codes related to the MAF being unplugged.
#21
Instructor
iTrader: (6)
by what your saying, sounds identical to the issue i had. The super light throttle makes your car buck but if you get in it it "seems" fine? bet if you got a new tps on there youd noticed a world o difference.
#22
Rookie
Thread Starter
Join Date: Jul 2013
Location: GA
Posts: 74
Likes: 0
Received 0 Likes
on
0 Posts
At the time a friend who worked at a local tire shop had the solus scanner that the whole chain passed around. Another friend picked up a snap-on scanner and it has the obd1 toyota adapter.
by what your saying, sounds identical to the issue i had. The super light throttle makes your car buck but if you get in it it "seems" fine? bet if you got a new tps on there youd noticed a world o difference.
by what your saying, sounds identical to the issue i had. The super light throttle makes your car buck but if you get in it it "seems" fine? bet if you got a new tps on there youd noticed a world o difference.
#24
Driver School Candidate
Join Date: Aug 2013
Location: pa
Posts: 17
Likes: 0
Received 0 Likes
on
0 Posts
hi guys i am having the same problems with my 93 sc400 has about the same mileage 117k and i did everything swint did my self. only thing i got mine with the idle problem its just getting worse every day i disconnect my MAF SENSOR and it runs much better i have a check engine light and a traction light when i disconnect it. I take it to the Lexus dealer and they are telling me to start with replacing my transmission like am stupid or i have money like that they r just throwing parts at cars. O I have too throttle plate in mine one is open all the time and the other is close until i rev it out is that normal? i love this car would love to fix the problems.
#25
1JZ Single SC400
iTrader: (59)
Join Date: Jan 2009
Location: Alabama, Roll Tide!
Posts: 8,518
Likes: 0
Received 15 Likes
on
12 Posts
I am still leaning towards three things: bad coils, IACV, and or ignitors...
Here is a great DIY for really cleaning the IACV. I would do this first. While you are at it, replace the bearings, and then put back together.
https://www.clublexus.com/forums/per...acv-sc400.html
Here is a great DIY for really cleaning the IACV. I would do this first. While you are at it, replace the bearings, and then put back together.
https://www.clublexus.com/forums/per...acv-sc400.html
Thread
Thread Starter
Forum
Replies
Last Post
MuGGzyx
Performance & Maintenance
15
04-20-14 10:08 PM