Top 20 1998 Buick Century Questions & Answers

Question edited to fix the murdered spelling :>D please don't type in ALL CAPS. It makes it very hard to read and is considered SHOUTING in Internet Land! Question moved to sub category. Cars of that age has a key for the door with a different keyway and no chip. The ignition key is different and has a chip. To get into the vehicle, get underneath and put a battery charger on the + of the charger on the big red red wire terminal of the starter. Put the - on any clean bolt. Open with the key fob. Move the leads to the battery and charge it up. Then find out why the battery was flat.

Question edited for clarity. See the videos in the link https://www.google.com/search?q=1998+Buick+Century.+Removal+of+sun+visors ..

New sensor for $8 https://www.google.com/search?q=reset+a+low+coolant+light+on+a+1998+Buick+century ..

Fuse #23. Here is a diagram. https://www.autogenius.info/buick-century-1998-fuse-box-diagram/

3800 Coolant elbow replacement YouTube 3.1 L engine is the same .

Try this site. If it is not helpful, signup for a free account with Autozone and then search there for a service manual. Buick Workshop Manuals

Those adapters are barely functional at best. You will never get good sound, even if it was working perfectly. I tried one but then bought an aftermarket stereo.

many fuel pumps get there power from the relay that is energized by the ECM there is a pressure regulator in the system that will report to the ECM to switch on the fuel pump when the pressure falls if you have no power to the relay , it could be because the pressure in the fuel system is above cut in pressure or that pressure regulator is not passing the current to the ECM

Do you know how to do automotive electrical testing ? How to use a DVOM - digital volt ohm meter ? You have high resistance in the circuit . Use voltage drop to find the problem . Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

code p 0420 refers to cat converter system bank 1---efficiency below threshold====causes ---cat converter---wiring---HO2S (heated oxygen sensor, the one in the exhaust manifold before the cat converter) code p 0300 is random misfires I would suggest changing the HO2S as it reports to the ECM on exhaust content so that the ECM can adjust the air/fuel ratio so it is logical that if that unit is not reporting correctly, the cat converter may be having trouble burning off the gasses correctly The oxygen sensor(O2S) reads the results of the cat converter operation and helps fine tune the ECM settings

Compression testing !

further problems with evap system causing fuel starvation.... try running with evap hose vented to atmosphere.. if solves your problem faulty evap canister.... if not! blocked pipe or faulty evap presser valve

check fuses and relay first if good than more than likely---if when u use lever to turn on but wont stay on or dont go on at all would show that the multi switch (inside column ) either broke (plastic) or wore out ---

Should be in the power distribution center under the hood.

Under the dash on the left hand side but if there was a wire plug on old seat buckle should be able to loop circuit together so acts like seat belt is always hooked

This may be related to the antitheft system The system is known for turning off the starter and/or injectors when it fails. Is there a light on the dash that says SECURITY? This is a common problem worth looking into. http://www.diy-gm-security.com/

DTC 1676 [Archive] - FirebirdV6.com/CamaroV6.com Message Board

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Mar 6, 2003 - 9 posts - ‎4 authors 71-65-66 NOV 97 Engine Controls - EVAP DTC's P1665 & P1676 Added " that is from alldata as a TSB i dont know what "EVAP" is though.

Find Technical Service Bulletins for your 1998 Buick ...

tsb.govwebs.com/k-vin-v638l-lesabre-buick-1998-10199.html

Free Technical Service Bulletin and Recall Titles for 1998 Buick LeSabre V6-3.8L VIN K ..... 71-65-66, NOVEMBER 1997, Engine Controls - EVAP DTC`s P1665 ...

Trouble Code - AutoZone

www.autozone.com/.../Buick.../_/P-0996b43f8036fc4e

AutoZone... power circuit is open (check ENG EMISS fuse). Purge solenoid is damaged, or the PCM has failed. TSB 71-65-66 contains a repair procedure for this code ..

First thing to check is the connection at the window. It is small but there is a connector that plugs in. A lot of the time that has weakened and can be fixed with a kit or soldering.

Purchase a Chilton manual for all the diagrams you need.

Check the Transmission control module first. If it tests OK then look at the shift solenoids inside the transmission