Question about 1988 Buick LeSabre

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1988 buick service engine soon light flashes code 63, is this a cruise control problem?

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  • Shayne Strobeen Jun 28, 2009

    Thanks for the info. Now I can get a haynes and replace it myself. Saves me a bunch of money.

  • Shayne Strobeen Jun 29, 2009

    Yes, the cruise sometimes just slows itself down 10-15 mph sometimes. The book I got with my little code thing said that the egr or the cruise might be the problem. My engine says 3800 on top.

  • Shayne Strobeen Jun 30, 2009

    The last solution was excellent. I will clean the egr and I did find the connector for the cruise and it is cracked, but just barely. I have to get the gasket and the new connector and I will have at it. Thanks for all of your help!

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  • Master
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Egr flow problem egr solenoid did not work properly.

Posted on Jun 28, 2009

  • honeymokey
    honeymokey Jun 28, 2009

    It may not be the egr valve, it may be the black box thing with a round knob looking thing on it. You do have 3.8L motor and not one that says 3800 on top of the motor right? These motors are completely different. Is something wrong with cruise?

  • honeymokey
    honeymokey Jun 30, 2009

    Ok, forget what I said about in the other comments , as I was thought you had a 3.8. A 3800 has a different egr system on it. The 36 code is an incorrect egr operation. These valves are expensive. About $176.00 at the zone. Hint, you can clean yours. They will build up carbon under the solenoids.. Remove the egr valve from engine and dissemble it. There are three torx head screws you will have to remove to get to the bottom of the solenoids. The plungers may come out of but the will go right back in. I cleaned mine with spray carburetor cleaner. You will need to get a gasket to go between egr and engine. Be careful not to damage gaskets that are on the egr valve so you can re-use them as there are no replacements. As for your cruise problem, follow the vacuum hose to where it meets a three way connector. It should be along firewall in front of drivers side. Over time this black tee will turn grey and fall apart and get holes in it. Replace if this is the case. To reset the computer disconnect the negative battery cable and touch it to the positive cable, this will dumb the computer and reset it, so the light will go out.

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  • Buick Master
  • 2,359 Answers

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Posted on Dec 19, 2009

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What can I do to save gas on my 1988 Buick Century


Drive slowly, don't over rev the engine if you don;t need to.
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This a technical bulletin for your car
Hope this helps, if it does please leave feedback
Good Luck



File In Section: 5 - Brakes
Bulletin No.: 63-50-09
Date: March, 1996
INFORMATION
Subject:
"ETS OFF" Indicator Lamp On with No DTC's Set Models:
1996 Buick Skylark
1996 Chevrolet Cavalier
1996 Oldsmobile Achieva
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41807575
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Service engine soon light is flashing


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