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Buick LeSabre Hesitation

8 messages,  Last post on Nov 30, 2008 at 5:14 PM

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#3 of 8 Re: 99 has major Hesitation... HELP??? [imidazol97] by dharker Sep 03, 2007 (7:44 am)
Replying to: imidazol97 (Sep 03, 2007 5:01 am) She's got 135k on her... just picked her up. I just did 100k tune-up including coolant flush. Three's no codes stored and she does it when she's at normal operating temp, from a dead stop.. Does not do it when she's cool or from a rolling start. No problem starting, no run-on when I turn her off. Also, she never reaches the 200 degree mark on temp guage...always seems to run cooler, even though fans do come on. I agree... don't want to start throughing parts at her. THANKS!! Replies to this message: imidazol97 (Sep 03, 2007 9:00 am)
#4 of 8 Re: 99 has major Hesitation... HELP??? [dharker] by imidazol97 Sep 03, 2007 (9:00 am)
Replying to: dharker (Sep 03, 2007 7:44 am) The first thing that comes to mind is the MAF sensor. I know some people have to replace those. They can be cleaned carefully using a cleaner meant for intakes and a soft brush like an artist's brush to clean the fine wire, which breaks easily. This is held on by three screws and they are security screws requiring a special torx-like screw driver head.   Second is the throttle position sensor. This is located at the pivot axle location of the butterfly valve inside the throttle body.   Third is cleaning the whole throttle body. If there's a sticking when cold at first movement of the throttle pedal, the inside of the throttle body may be caked with black goop. That might affect the operation of sensors and other parts.   Third is the idle air control. This also can cake up with the goopo from the throttle body. It's a valve that bleeds air when the engine is idling. Gooping up blocks it. Then when you're above idle and the throttle plate is open it shuldn't have much effect. It also is removable for cleaning with appropriate cleaner.   All three of these are located on the throttle body. The whole throttle body can be removed for cleaning but that requires draining coolant and a few difficult screws and a new gasket to seal it to the face of the plastic upper air intake manifold.   Last I'd pick up a large bottle of Techron Fuel System Cleaner by Chevron at Pepboys, or Meijers, or Walmart (only has small 12 oz bottle but cheaper). Do not use injector cleaner etc. Put it into a nearly empty tank like the bottle says. If the fuel used by previous owners was not always good brands and sat in tank for long periods before use it may have injectors not clean. If you have the 20 oz bottle just fill up tank since it's for up to 20 gallon. If you have the 12 oz bottle put in up to 12 gallons, about 2/3 tank. And drive till nearly empty. If you notice a difference after 5-10 miles, then it has helped.   Report back.
#5 of 8 UPDATE by dharker Sep 03, 2007 (6:50 pm)
Well, Now the C.E. light on. I'll borrow a scanner tomorrow and take it from there. Thanks for the advise Replies to this message: imidazol97 (Sep 04, 2007 4:28 am)
#6 of 8 Re: UPDATE [dharker] by imidazol97 Sep 04, 2007 (4:28 am)
Replying to: dharker (Sep 03, 2007 6:50 pm) I'll bet on plugs AND wires. Use OEM wires from AC or NAPA. Don't use fancy wires from the box stores in the pretty packages, etc. I did that one time.   Stick with the AC plugs recommended by the book. It may be a different number than the originals, if taht's what's still in there.
#7 of 8 buic problem with o2 sensor by saucemoney Mar 10, 2008 (2:10 pm)
i have a 1989 lesabre and i put a scanner on it and it gave me code 44 that says lean exhaust indication oxygen sensor voltage stays low after one or two minutes of engine run what does this mean should i change the oxygen sensor
#8 of 8 small skip by JEanes Nov 30, 2008 (5:14 pm)
I don't see a section for Riviera so I will try here. I have a '97, 3.8 S/Charged. Problem, small skip or "bump" after warm up and mostly after shifting into drive/overdrive. RPM's go up/down 100/200, changed plugs(AC Delco) and (box store wires) . Problem got some better but not gone totally. Tried changing 1 of the power packs and then got a mis-fire code on #3. Went back to orinal p-pack. I also have a bit of a problem with throttle responce. On a grade, I have a bit of lugging, press down on the pedal and have to push about 3/4" and then it jumps to 2300 or so RPM's and shifts into another gear and moves on.

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