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Re: Accelerator and computer Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Sun, 21 May 2006 05:16:31
In Reply to: Accelerator and computer, Hdhntr23, Fri, 19 May 2006 12:53:14 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Trip computer first-
Reset the trip computer - hold the 'R' key down for at least 4 seconds, until the display blinks. The MPG will drop to 0 and the Miles to empty will too. The system uses the speedo signal, and does a continuous average over all the miles since reset. With a broken speedo, it's going to be guessing wrong.
Gas pedal 'hardness' - well, there is a spring to resist you at the throttle body. But springs don't normally get stiffer with time. Two things come to mind-
Check the linkage at the throttle body - make sure nothing is binding. There are a lot of rotating bits there, and it is possible something has gotten dirty or corroded. It is possible that the accelerator cable itself has gotten some water into it. At the throttle body end, drip some light machine oil down the metal (moving) part of the cable.
At the pedal end, make sure the carpet isn't binding on it. Make sure there is no obvious mechanical binding there. If you unhook the cable from the throttle butterfly, you'll be able to feel for binding in the pedal and see if the cable itself has resistance or a kink.
The second thought is that there is absolutely nothing wrong with the accelerator pedal system. How is your boost? Is it going up to the bottom of the red as it should? Is the car slower than before? Does the 'heavy' pedal seem to be more of a problem at low throttle settings?
Why, you ask? The pedal is on a spring, and since the spring constant is non-linear, it's harder to push the pedal the farther you push the pedal. It should be easy at a nearly closed throttle, and harder at full throttle.
If the engine has lost even a little low-end power, it will feel doggy off the line and at low throttle settings. To get more power, you press the pedal more, and that takes more force. So a slightly heavy pedal can be the sign that the car is less responsive, so you unthinkingly press the pedal just a little more.
For that, make sure the car is in tune. Are the plugs new, the proper NGKs, and properly gapped? When was the fuel and air filters last changed? Check for vacuum leaks. Inspect the DI for any obvious leaking of oil. Beyond that, suspects would be a 'lazy' O2 sensor, if the problem seems to be when driving at mostly closed throttle settings (because the system is still closed loop then).
posted by 12.76.154...
, Sun, 21 May 2006 05:16:31 <-- Viewing This Message
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