Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hi my name is ***** ***** I will be happy to assist with this today.
One common issue I have seen that causes this here is a restriction with the catalytic converter itself.The exhaust catalytic converter plugs up over time and when this occurs this causes laboring or hard acceleration acting like it's running out of fuel or lack of power and in some cases even a stall out condition.
If you have not had a back pressure test done this needs done.If the back pressure exceeds 1.5 p.s.i. At any r.p.m. range this indicates the catalytic converter is restricted needing replaced to correct this here.I have had to replace quite a few of these for this issue.This being plugged can also limit the amount of r.p.m.s the engine can produce.
Let me know if you need anything else and feel free to rate my help if you like.Thanks Pete.
I have seen in some cases where the engine coolant temp sensor can send a false temp signal to the computer and cause this issue as well here and can be common.If this sensor was not replaced and as common as it can fail and due to the year of this model it may need replaced for this issue here.
In some cases the honey comb inside the catalytic converter can break apart internally and allow the engine to run properly at some points and then the honey comb can vibrate around and plug off the exhaust partially and cause this here.If the engine coolant temp sensor does not correct this fault here if you can when it is acting up I would have an exhaust back pressure test done to see if it is restricted needing replaced.
O.k.,let me know what you come up with here and if you need anything else.