Jerking and TPS sensor Options

[UVZ164]

Hey guys,

For the last few months my car has been jerking ALOT when going on or off the throttle. Its a 97 ZR(GT) 5sfe manual. Its not the normal manual tranny shake when you let off, its very violent and all my passengers comment which kills me a little bit every time. So far i've replaced the:
* spark plugs
* dizzy
* cleaned the TB and IACV valve
* new air filter
* cleaned all moving mechanisms with the throttle cable and pedal assembly to ensure no sticking

However the jerking lives on

The only other things i could think of are the spark plug wires and the TPS sensor.
I borrowed an ohmetre and did some testing of the TPS. In the fully closed position the reading is 0.4 and the allowable range is (0.2 - 5.7). When fully open the reading is 2.6 and the range is (2 - 10.2). Theres another test that is two diff pins that reads 3.4 and the range is(2.5 - 5.9). Do the first two seem a little low? Yes they are in the allowable range but almost every other electrical connection i have tried has been smack bang in the middle of the range.
I also did a continuity test of the TPS sensor. When the distance between the throttle stop screw(most commonly knows as the idle adjust screw) and the plate is 0.5mm there should be continuity and when 0.7mm or greater there should be no continuity. Now when i have it at 0.5mm (using a feeler gauge) the ohmetre reads OL and the same thing when at 0.7mm. Does this null continuity result mean the TPS sensor is bad? And could that possibly be whats causing the jerking? If not what do you think could be causing it?

Quick one at the end, what should the idle be on a 5sfe manual? The BGB says that all 5sfe no matter what year or tranny ahould be at 700, however the BGB i have is for a 98 OBDII car and mine is a OBDI. I have also read that the manual idle should be up around 800-850. Mine is currently at 700 but there is alot of vibration and i have only recently replaced the front and rear with non-polyurethane engine mounts. Should i raise it up to 800 using the screw or leave it at the 700?

Thanks alot guys!

Reece

[TannerEsser]

Hey guys,

For the last few months my car has been jerking ALOT when going on or off the throttle. Its a 97 ZR(GT) 5sfe manual. Its not the normal manual tranny shake when you let off, its very violent and all my passengers comment which kills me a little bit every time. So far i've replaced the:
* spark plugs
* dizzy
* cleaned the TB and IACV valve
* new air filter
* cleaned all moving mechanisms with the throttle cable and pedal assembly to ensure no sticking

However the jerking lives on

The only other things i could think of are the spark plug wires and the TPS sensor.
I borrowed an ohmetre and did some testing of the TPS. In the fully closed position the reading is 0.4 and the allowable range is (0.2 - 5.7). When fully open the reading is 2.6 and the range is (2 - 10.2). Theres another test that is two diff pins that reads 3.4 and the range is(2.5 - 5.9). Do the first two seem a little low? Yes they are in the allowable range but almost every other electrical connection i have tried has been smack bang in the middle of the range.
I also did a continuity test of the TPS sensor. When the distance between the throttle stop screw(most commonly knows as the idle adjust screw) and the plate is 0.5mm there should be continuity and when 0.7mm or greater there should be no continuity. Now when i have it at 0.5mm (using a feeler gauge) the ohmetre reads OL and the same thing when at 0.7mm. Does this null continuity result mean the TPS sensor is bad? And could that possibly be whats causing the jerking? If not what do you think could be causing it?

Quick one at the end, what should the idle be on a 5sfe manual? The BGB says that all 5sfe no matter what year or tranny ahould be at 700, however the BGB i have is for a 98 OBDII car and mine is a OBDI. I have also read that the manual idle should be up around 800-850. Mine is currently at 700 but there is alot of vibration and i have only recently replaced the front and rear with non-polyurethane engine mounts. Should i raise it up to 800 using the screw or leave it at the 700?

Thanks alot guys!

Reece

it could be your motormounts. if the passenger side mount is loose or broken it will shake alot it could be any of the mounts though. If its your mounts, its very possible the last time they were messed with the bolts may have not been tightend all the way, if they werent they could have broken off and youll have to tap the broken bolts out of the motor. If they are loose and they arent broken well then all you need to do is tightten them! Another common problem that will cause your car to jerk or shake violently is your clutch. if you clutch is getting old you can get something called clutch chatter. If it is clutch chatter you could either accelerate more carefully or replace your clutch. i would suggest replacing your clutch.

[xrav22]

Hey guys,

For the last few months my car has been jerking ALOT when going on or off the throttle. Its a 97 ZR(GT) 5sfe manual. Its not the normal manual tranny shake when you let off, its very violent and all my passengers comment which kills me a little bit every time. So far i've replaced the:
* spark plugs
* dizzy
* cleaned the TB and IACV valve
* new air filter
* cleaned all moving mechanisms with the throttle cable and pedal assembly to ensure no sticking

However the jerking lives on

The only other things i could think of are the spark plug wires and the TPS sensor.
I borrowed an ohmetre and did some testing of the TPS. In the fully closed position the reading is 0.4 and the allowable range is (0.2 - 5.7). When fully open the reading is 2.6 and the range is (2 - 10.2). Theres another test that is two diff pins that reads 3.4 and the range is(2.5 - 5.9). Do the first two seem a little low? Yes they are in the allowable range but almost every other electrical connection i have tried has been smack bang in the middle of the range.
I also did a continuity test of the TPS sensor. When the distance between the throttle stop screw(most commonly knows as the idle adjust screw) and the plate is 0.5mm there should be continuity and when 0.7mm or greater there should be no continuity. Now when i have it at 0.5mm (using a feeler gauge) the ohmetre reads OL and the same thing when at 0.7mm. Does this null continuity result mean the TPS sensor is bad? And could that possibly be whats causing the jerking? If not what do you think could be causing it?

Quick one at the end, what should the idle be on a 5sfe manual? The BGB says that all 5sfe no matter what year or tranny ahould be at 700, however the BGB i have is for a 98 OBDII car and mine is a OBDI. I have also read that the manual idle should be up around 800-850. Mine is currently at 700 but there is alot of vibration and i have only recently replaced the front and rear with non-polyurethane engine mounts. Should i raise it up to 800 using the screw or leave it at the 700?

Thanks alot guys!

Reece

it could be your motormounts. if the passenger side mount is loose or broken it will shake alot it could be any of the mounts though. If its your mounts, its very possible the last time they were messed with the bolts may have not been tightend all the way, if they werent they could have broken off and youll have to tap the broken bolts out of the motor. If they are loose and they arent broken well then all you need to do is tightten them! Another common problem that will cause your car to jerk or shake violently is your clutch. if you clutch is getting old you can get something called clutch chatter. If it is clutch chatter you could either accelerate more carefully or replace your clutch. i would suggest replacing your clutch.

I had terrible clutch chatter before I had my cluth, slave, fly, replaced. BUT I would not have chatter if I started off in 2nd gear. for some reason it didn't do it(only do that test on level ground). Also if I revved engine extra high and let it out in 1st I could avoid it. It was worse on hot Cali days.