Question about 1986 Buick Century

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1986 century changed spark plugs running rough and blowing black smoke

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  • Buick Master
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Posted on Feb 23, 2016

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1994 Buick Century [four cylinder engine]

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

cadman000
  • 607 Answers

SOURCE: 1990 Buick Century 3.3L Check Engine Light comes on, stalls.

Need to check for fault codes. Possibly a faulty sensor causing the fuel system to run rich or lean.

Posted on Mar 27, 2009

  • 1 Answer

SOURCE: how do I change the headlights and the spark

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

  • 3 Answers

SOURCE: how do you change the spark plugs in my 95 buick century ?

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!!



Good Luck!!
Clong

Posted on Aug 03, 2009

  • 881 Answers

SOURCE: 1990 oldsmobile CC SL running very rough, smoking, backfiring

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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1 Answer

Blowing black smoke


far too much fuel not getting completely burned upon iginition.
That leads on to look at:
-fouled fuel injectors, (clean them - run injector cleaner)
-lack of air to the intake (filter and clear out tubing),
-spark plugs are fouled, (replace them, ensure wires seated correctly on plug)
-ignition power is low or partial, (ignition system module not sending enough electricity to plugs)
-ignition wires are bad, (check/replace)
-ECM is failing or getting bad sensor readings. (shop diagnosis)
-cat convertors have been removed and sensors are at fault
Its a long list -- do the easy stuff yourself, leave hard stuff to a shop diagnosis.

Mar 28, 2015 | Cars & Trucks

1 Answer

4g63 delica black smoke running rough


You have a failed head gasket

Major repair

Hope you didn't think the stop leak was
a genie in a bottle,never need any product
in any vehicle,just the proper repair

White smoke was coolant ,should have known that

Nov 24, 2012 | 1996 Mitsubishi Eclipse

1 Answer

4.0 runs but misses and blows blak smoke


if your blowing black smoke your running way to rich (to much gas not enough air) fuel pressure regulator stuck injector bad plugs and wires
where i would start is check fuel pressure regulator that more than likely your cause but u need to change your spark plugs too because all that gas is fouled out your plugs check your spark plug wires with ohm meter if they read under 15 k ohms there good

Feb 13, 2010 | 1988 Jeep Cherokee

2 Answers

1999 buick 3.8, was running rough with white smoke.


white smoke tells me engine coolant is mixing with the combustion chamber. you have leaking head gaskets

Feb 07, 2010 | 1999 Buick LeSabre

1 Answer

My 96 sunfire 2.2 l auto idels rough and blows out black smoke when i rev up the motor. i also hesitates on the highwy


Black smoke is from too much fuel, or a mis-firing of the spark plug. Pull all plugs to look to see if one is blackened. If so, this is your troubled cylinder. You can test each spark plug wire with a High energy spark plug tester. If that looks OK, then do a compresion test to see if the mechanical part of the engine seems good.

Oct 08, 2009 | 1996 Pontiac Sunfire

1 Answer

1990 oldsmobile CC SL running very rough, smoking, backfiring


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

Oct 02, 2009 | 1990 Buick Century

1 Answer

Engine light came on....code reads oxygen


does the jeep run rough and blow black smoke if so it will be the oxygen sensor if not i would try plugs and a air filter.

Sep 22, 2009 | 1997 Jeep Wrangler

1 Answer

Exhaust blows black on ford explorer


look for a vacume leak. black smoke means it is running very rich

Mar 17, 2009 | 1992 Ford Explorer

1 Answer

Jeep running rough; black smoke from tailpipe; dying occasionally


Have you taken a spark plug out yet? You may have fowled them out. if they are not clean and have a whitish tone to them, then they need to be replaced.

Nov 28, 2008 | 1988 Jeep Cherokee

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