Subject: got a wierd problem while driving IP: Logged
Message: got a 01 4.7 4x4 auto and at least a couple times a week while driving down freeway at speeds around 65mph the truck jerks like someone jabs the brake pedal quickly. anyone else had same problem??? or ideas ?? Thanks.
Message: By the description you give and if the RPM's are jumping about 200-300 when you notice this it could be the old TPS (throttle Position Sensor) problem which is a common problem and easy to fix. They way you are describing it does not quit match this issue but you may not know what else to look for to verify it. Just a thought though.
Chris
Never late for a Tee time or wheelin with my buddies! Always ready for both!!!
Message: Hey fox four can you tell me more about the throttle position sensor, I think i have that problem. Where is it located and how can i fix it, I'm no Joe Mechanic though. Thanks
Message: the cruise is not on and the rpms don't seem to jump. i don't see how the brakes could be grabbing but that is what it feels like it only lasts a split sec.
Message: My buddies toyota did that at highway speeds. He ended up selling the truck before we could ever figure out what the heck it was. Rear axle wouldnt be it likely, maybe the timimg chains or crank position sensor? the TPS is a good bet but i know what he means, this isnt like letting off the gas, its a good jerk. Best of luck.
Message: The TPS is on the left side of the throttle body. Take off the air hat and there is a 2 wire plug attached to it. 2 screws hold it in and it is very simple to change. I am no mechanic and I was able to change it in 10 minutes. About a $35 part. If you need help locating it I can try and get a photo up for you.
Chris
Never late for a Tee time or wheelin with my buddies! Always ready for both!!!
Message: could be the ABS controller. the ABS can pulse the brakes through the hydrolic lines. the controller should be on the fender liner on the driver's side. its inserted in the brake lines between the master cylinder and the front calipers & rear slave cylinders on 4-wheel ABS. on 2-wheel ABS is inserted between the master cylinder and the rear slave cylinders on the rear brakes.
don't have any idea how to check it. you should see if anyone has a shop manual and can look up the ABS system to see if it has any diagnostic port. it may be linked into the engine computer. if so you'll need to hook up to an engine diag machine to check the ABS controller.
Message: Does it pull when you hit a wave in the road and the front drops down some? Not a bump or hole, but a dip where the truck compresses down. And it is just for a split second where you have to correct the steering. Commonly referred to as bump steer. Is this what is happening?
Subject: got a wierd problem while driving
RE: got a wierd problem while driving
