Running Rough & Braking Problems
Thread Starter
|
New User
Joined: Sep 2008
Posts: 2
Likes: 0
Running Rough & Braking Problems
Ok guys I have a 1999 F-150 5.4, auto, 4x4 and I have 2 problems I need help with PLEASE !!!!!
1st Problem If you hold the accelerator pedal to 1500 rpms it drops to 1200 then rises back to 1500 then drops again, and countinues. If you are under acceleration and reach 1500 rpm the truck shutters and bucks then smoothes out after 1500........... What is going on....?
NOTE : It also smells rich in the exhaust. I had a EGR code, so I replaced it but it must have been a seperate issue.
2nd Problem is my ABS light is on, we have replaced the speed sensor, with no luck. The brakes pulsate while applying them. Wore out a pair of rotors and pads in about 6k miles. Replaced the pads and rotors again and now 2k miles later the brakes are already so nasty they give you a headache while stopping.
Here is the kicker, when the brakes are wet, the ABS light DOES NOT come on & the ABS works properly, as soon as it dries out, bing - the light comes on and the brake pedal start pulsating again and no ABS working.
Thanks in advance-
1st Problem If you hold the accelerator pedal to 1500 rpms it drops to 1200 then rises back to 1500 then drops again, and countinues. If you are under acceleration and reach 1500 rpm the truck shutters and bucks then smoothes out after 1500........... What is going on....?
NOTE : It also smells rich in the exhaust. I had a EGR code, so I replaced it but it must have been a seperate issue.
2nd Problem is my ABS light is on, we have replaced the speed sensor, with no luck. The brakes pulsate while applying them. Wore out a pair of rotors and pads in about 6k miles. Replaced the pads and rotors again and now 2k miles later the brakes are already so nasty they give you a headache while stopping.
Here is the kicker, when the brakes are wet, the ABS light DOES NOT come on & the ABS works properly, as soon as it dries out, bing - the light comes on and the brake pedal start pulsating again and no ABS working.
Thanks in advance-
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
Welcome to FTE shucky! 
How many miles are on the truck and do you have a history with it?
Your first problem sounds like a possible TPS problem. Could also be a misfire in the engine.
Does your truck have 2WABS or 4WABS? If it is 4WABS, then check the senors and sensor rings at the front wheels. Good luck!
How many miles are on the truck and do you have a history with it? Your first problem sounds like a possible TPS problem. Could also be a misfire in the engine.
Does your truck have 2WABS or 4WABS? If it is 4WABS, then check the senors and sensor rings at the front wheels. Good luck!
Thread Starter
|
New User
Joined: Sep 2008
Posts: 2
Likes: 0
Welcome to FTE shucky! How many miles are on the truck and do you have a history with it?
Your first problem sounds like a possible TPS problem. Could also be a misfire in the engine.
Does your truck have 2WABS or 4WABS? If it is 4WABS, then check the senors and sensor rings at the front wheels. Good luck!
How many miles are on the truck and do you have a history with it? Your first problem sounds like a possible TPS problem. Could also be a misfire in the engine.
Does your truck have 2WABS or 4WABS? If it is 4WABS, then check the senors and sensor rings at the front wheels. Good luck!
Sorry about that... The truck has 145k miles. The plugs were changed about 7k miles ago. How do I check the TPS, would that cause it to run rich?
How do I tell if it is 4W or 2W ABS? Another thing that got me thinking, there is a high pitched squel coming from the drivers front brake, could a caliper be sticking, how do I check that?
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
I case you don't know what the TPS is, it is the throttle position sensor. It will be a rheostat that changes resistance when the throttle is operated. if the signal is erratic, the engine RPM will fluctuate.
If you have 4WABS, then there will be ABS sensors at the front wheels. You may have a caliper sticking due to collapsed rubber brake hoses between the caliper and the frame. A collapsed hose will allow fluid to flow out into the caliper but won't let it flow back to the master cylinder when the brakes are not being applied. Replace the hoses. Good luck!
If you have 4WABS, then there will be ABS sensors at the front wheels. You may have a caliper sticking due to collapsed rubber brake hoses between the caliper and the frame. A collapsed hose will allow fluid to flow out into the caliper but won't let it flow back to the master cylinder when the brakes are not being applied. Replace the hoses. Good luck!
Thread
Thread Starter
Forum
Replies
Last Post
mikulskn
1997 - 2006 Expedition & Navigator
7
Jun 26, 2013 11:23 PM
Orlie
1997 - 2006 Expedition & Navigator
6
Jun 7, 2005 11:11 PM
