Question about 1991 Buick Regal

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I need a diagram of a 1991 buick regal 3.1 engine

Help, trying to locate the pcb valve. camn't find a diagram anywhere!

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Are you talking about the pvc valve it is in front of the intake have to twist it to unlock it is under there take a pair of needlenose pliers to get it out

Posted on Feb 13, 2009

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1 Answer

My 1991 Buick regal failed the smog check, issues was failed the Fuel Evaporative Controls Functional. How can I fix it and pass smog check?


The emissions control valve is bad. Get a manual for your car from an auto parts store for the location and removal instructions.

Jun 10, 2014 | 1991 Buick Regal

1 Answer

RESISTOR LOCATION 1991 BUICK REGAL CUSTOM 3.8 PART NUMBER RU870


The blower motor on a park ave of the same year looks to be located near the middle of the firewall in the engine cmpt. The blower motor resistor you are referring to is part of that assembly. Please refer to the following diagram. Let me know what you find, good luck!

http://autorepair.about.com/library/images/bl107a-lib.htm

Jun 21, 2011 | 1991 Buick Regal

1 Answer

Need to replace the heat sending unit on 1991 buick regal but cannot find where the part is located can you please advise me of where the heat sending unit is


If you mean the engine temperature sending unit, it should be on the cylinder head and has a single wire attached to it. It looks a little like a miniature spark plug with a black insulation. To simplify your search, buy the new one and look for the same thing on the engine.

Feb 02, 2011 | 1991 Buick Regal

1 Answer

I have a 1991 buick regal stalls and shut off after warming up


egr valve is not opening up when the engine reaches it normal operating temperture

Feb 07, 2010 | 1991 Buick Regal

1 Answer

Where is the oil pressure sending unit on a 1991 buick regal gran sport 3.8?


Under hood, passenger side, rear engine area, below valve cover, mounted in block
hope this helps

Aug 15, 2009 | 1991 Buick Regal

1 Answer

86 buick regal pcv hose is loose


3/8 fuel line is heavy enough to use,and the pcv valve is located in the valve cover.

Feb 17, 2009 | 1986 Buick Regal

1 Answer

IAT Location Buick Regal 1999


iat screws into intake mine has two wires different year though.

Jan 20, 2009 | 1991 Buick LeSabre

1 Answer

Heater no working on 1991 buick regal 3.1


It probably has an airlock - so needs the air leting out of it.

If you have the bleed screw on the pipe that goes from engine to bulkhead, then, with engine cold, and heater turned to heat, start engine( KEEP CLEAR OF FAN / BELTS ), and undo bleedscrew to let out air. STOP ENGINE. Refill coolant to mark with antifreeze mix.

If this soes not solve problem, it could be more serious - either blocked matrix or if you only find steam regularly - it's a head gasket problem - requiring replacement.

Jan 13, 2009 | 1995 Buick Regal

1 Answer

1991 buick regal , 3.8lt,


1991 3.8 liter engines used a Mass Air Flow sensor in the intake tract (measures incoming air) instead of a MAP sensor. The MAF sensor is located on the engine just behind where intake hose is attached.

Jul 04, 2008 | 1991 Buick Regal

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