Question about 1986 Buick Century
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Posted on Jan 02, 2017
You might have your computer checked to make sure the circuit that controls egr valve is working. On my vehicle, I had several egr valves changed and failed the emissions test until I had the computer changed and the PROMS updated with the latest PROM.
The EGR valve is easy to change because it is on top of the engine. It has electrical coils that control the valve and one of the valves may be damaged where it can not compensate at idle. If the EGR is working, when the engine first starts the engine should increase in idle speed and then switch to a lower idle speed. This is part of the EGR system check and it adjusts as the engine increases in temperature.
There are several other reasons if one of the Emission sensors is faulty that may cause the rough idle. The oxygen sensor, tempearture sensor, MAP sensor,...etc. You may have a trusted mechanic attempt to read any codes on the engine.
Posted on Sep 15, 2008
I just had my spark plugs changed today on my 1989 buick century. I'll tell you this, the guy had a hard time doing it and had to take things off the engine to get to them. It was about a 5 hour job for the plugs and wires. Good Luck!
Posted on Apr 15, 2009
This is a very simple fix. My 1995 (6 cylinder) Buick plugs were really corroded and my engine was misfiring. I troubleshot this issue back to the plugs and replace all of them. I went to AutoZone and they said not to get the high firing plugs, they told me that the ACDelco (cheap) plugs were the best for this issue.
But as far as the changing goes. There are three plugs on the front of the block and three plugs on the rear of the block closest to the firewall. The front three are very simple to replace. While the back three are a little tricky, because they are screwed into the block at different angles. I would recommend getting a hose that can slip securely over the end of the spark plug (where the spark plug wires attach) and using this as an extension when screwing your new plugs into the block. This makes it a hell of a lot easier than trying to start the plugs with a ratchet extension or your hands, especially when trying to get the ones on the back side of the block started!!
Posted on Aug 03, 2009
Well Mike" a few things to check could be Breather on fuel tank /fuel return to tank pipe/ as pump can pump high pressure and excess has to return to tank and it sounds like yours is overfueling./take air cleaner off and all pipes and check for any thing partly blocking air flow/also check any black hoses coming from the engine breathers/going to air in take/make sure all cylinders got good compression
Posted on Oct 02, 2009
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