This connects to a 2002 Buick LeSabre with a 3.8 L engine, however the exact same basic concepts would use to the majority of any cars and truck with the exact same issue, I 'd think.
Sometimes, the accelerator would quickly withstand moving when pushed. When enough pressure was used, it would break loose and run generally. This appeared to be occurring more regularly and the pressure needed to break it loose ended up being higher.
Time to take a look at it!
Step one was to eliminate the plastic shroud which covers the engine. This can quickly be done by loosening the oil fill spout (the 3-inch extension onto which the oil filler cap fits) by loosening it a half turn and raising it out. This exposed the fuel injector body and system.
By by hand working the sector pulley-block which was triggered by the accelerator, I concluded that the butterfly was sticking in the closed position. How to get at it was the issue!
I eliminated the rubber boot in between the air box and the fuel injector body. This exposed a "screen" which absolutely covered the consumption!
That "screen" was kept in by a "C" ring which I eliminated next. The "screen" didn't come out quickly. It's not a flat screen; it's a honeycomb piece about 1/4 inch in density. It worked finest to work it out a little all around the area and walking around several times. I utilized a knife blade to pry it out, however next time I 'd utilize a wire with a hook on completion to enter and pull it out from the within.
- I believe its function is two-fold:
- Produce a laminar air circulation into the chamber, and
- Function as a "heat absorber" or flame suppressor in occasion of a backfire.
Once that was gotten rid of, I might see the butterfly and might basically validate that was where the issue was. I cleaned it up around the area, however it still stuck. I sprayed some AMSOIL MP (sort of like WD-40) into the butterfly shaft bushings.
That worked! Say goodbye to sticking!
For how long it will remain that method stays to be seen!
If it stops working once again, I'll eliminate the throttle position sensing unit on the front of the injector body. That need to expose one end of the butterfly shaft, which was completion which offered one of the most problem this time. (This needs a Torx wrench to eliminate.)
Exactly what was the cause? Really, I do not know. It imitated there was "old grease" in there which gummed up, however doubt that it was oiled with grease. Possibly "sticky things" in the gas over 60 k miles?
Copyright 2007 by Keith A. Williams