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jayeffel
User
Aug 30, 2008, 6:18 AM
Post #1 of 2
(2854 views)
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service code and remedy
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1988 Olds Delta 88 Royale, 6 cyl 3.5l. Buick engine I believe
The Service Engine light is on continuously codes identified as "41" and "63"'
Haynes Repair manual for the car shows code "41" as: A) "EST circuit- No distributor reference pulses to the ECM at specified engine vacuum (about 8 inches Hg)" and also as B) "EST- circuit- The electronic spark timing (EST) bypass circuit or the EST circuit is grounded or open. A malfunctioning HEI module van set this code". It show nothing for code "63".
Haynes Techbook for engine code show code "41' as: A) "No distributor signals to ECM, or faulty ignition module"; B) Cam sensor circuit fault or ignition control reference pulse error"; C) "Cylinder select error". {only showed codes causes that apply to this engine. For code "63" it shows : A) "EGR system fault (1990 and earlier Buick and Oldsmobile)"; B) "MAP sensor voltage out of range, probably high"; C) Cruise control system problem(speed error).
I had replaced the alternator a few months ago, which posed some problems. When I took the bad alternator off I removed the plug with 4-5 connections in it , the lead to the battery, and I thought another smaller wire that connected directly to the back of the alternator. The new alternator was different from the old one, the new one is what is shown on the Hayne's manual, at Advanced Auto and Auto Zone. The older one was wired differently. When connecting the new alternator, there was no connection for another wire. and I did not see any wire loose where I would have laid it - near the alternator waiting to be connected.
What are the codes telling me? Replacement of a part or parts? Adjustment of one or more parts? Where should I look?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 30, 2008, 9:26 AM
Post #2 of 2
(2848 views)
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Re: service code and remedy
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jayeffel - you meant 3.8L didn't you?
Suggestion: Before you let codes on a 1988 MY vehicle drive you nuts try just R&R ign module and make sure all connections are good and the mess of wires there. Just a thought as the bad connections = bad info,
T
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