This concerns a Buick LeSabre 02 with a 3.8L engine, but the same general principles would apply to most cars with the same problem, I suppose.
Sometimes, the accelerator would briefly withstand move when pressed. Then, when sufficient pressure has been applied, it detach and function normally. This seemed to occur more frequently and the pressure required to break loose became larger.
It's time to look!
The first step was to remove the plastic cover that covers the engine. This can be done easily by unscrewing the oil filler neck (3-inch extension on which the oil filler cap suitable) by unscrewing of a turn and lifting. This exposed the fuel injector body and the mechanism.
By manually operating the pulley sector that has been activated by the accelerator, I conclude that the butterfly was stuck in the closed position. But how to get to it was the problem!
I removed the rubber boot between the air box and the body of the fuel injector. But it revealed a "screen" which covered the plug all!
This "screen" was held in a "C" ring, which I next removed. But the "screen" does not come out easily. It is not a flat screen; it is a honeycomb piece about 1/4 inch thick. It worked better to work a little around the circumference and which circulates several times. I used a knife blade to lift it, but next time I use a wire with a hook at the end to get in and remove it from the inside.
- I think its purpose is twofold:
- Create a laminar air flow in the room, and
- Serve as a "heat-absorbing" or flame suppressant in case of flashback.
Once that was removed, I could see the butterfly and could confirm that enough was where the problem was. I cleaned around the circumference, but it still stuck. Then I squirted some AMSOIL MP (much like WD-40) in the throttle shaft bushings.
This is the case! No more sticky!
How long it will stay that way remains to be seen!
If it fails again, I'll remove the throttle position sensor on the front of the body of the injector. This should expose one end of the throttle shaft, and that was the end that gave the most trouble this time. (This requires a Torx wrench to remove.)
What was the cause? In truth, I do not know. He acted like he was "old grease" out there that dirty, but certainly it has been lubricated with grease. Maybe "sticky substance" in Gasoline 60k miles?
Copyright 07 by Keith A. Williams
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