20 Most Recent 1990 Buick LeSabre Questions & Answers


Check for voltage at the pump before you condemn the relay. If voltage present, the pump is bad. If voltage not present, check fuse. Fuse o.k. then the relay.

1990 Buick... | Answered on Feb 04, 2018


The early GM products would build up restance in the wire that went from the alternator to the starter. The easy cure for this is to install a 10 guage wire directly from the Alternator Batt. lug directly to the battery postive post. Do this using the correct end connectors.. do not just wrap the wire around the termanel. This was a big problem on these cars. especially the Diesel cars. Always disconnect the battery ground terminal before you work on this.

1990 Buick... | Answered on Apr 10, 2017


How full do you keep your fuel tank ? If you repeatedly let the fuel level low ,this will cause premature failure ! Need's to stay around 1/2 tank or fuller , keeps fuel pump lubricated . So if you run your vehicle with a 1/4 tank or less all the time , this will cause fuel pump problems .Could have a resistance problem in the electrical circuit ! Does the connector at the pump look burnt when changed ?

1990 Buick... | Answered on Nov 23, 2016


If it is out of time too much between the cam and crank, you stand a good chance of bending valves. A stuck lifter can cause a push rod to bend which will produce a noise and a cylinder to not work. Engine won't idle or rev up well when this happens.

1990 Buick... | Answered on Sep 09, 2016


There is no such button. 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/

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1990 Buick... | Answered on Dec 12, 2015


There isn't one as far as I know.
If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure. Also check for a fuel injector pulse.
Your obd1, you should be able to check for applicable trouble codes, if there are any.

1990 Buick... | Answered on Nov 27, 2015


Buick LeSabre Questions - Running without a Mass Air Flow ...

www.cargurus.com > Questions > Buick > LeSabre
CarGurusJun 11, 2013 - It drives perfect then all of a sudden while im driving it stallsoccasionally. ... it idles ruff an stalls until it warms up does the same in gear its throwing engine ... If you are installing a idle air control valve in a 1990 Buick Centuryyou ... I put in my 3rd MAF sensor in 2 weeks and now the car is no longer stalling.

1990 Buick... | Answered on Sep 29, 2015


when was it last fully serviced? Its an old car so whats its history, mileage, condition etc. Be honest with the answers as to its condition then we can help.

1990 Buick... | Answered on Aug 09, 2015


I use a set of allen type drivers on a 3/8 drive breaker bar or ratchet. Most parts stores sell a set of 5 or 6 sizes.

1990 Buick... | Answered on Jun 15, 2015


I'm sure there won't be a separate fuses for each window, therefore the cause will be the drivers door switch. Also check for corrosion on the terminals.

1990 Buick... | Answered on Mar 13, 2015


computer try salvage yard expensive at dealer

1990 Buick... | Answered on Mar 01, 2015


in the manual or a tag on door or doorpost driverside

1990 Buick... | Answered on Mar 01, 2015


in fuse box under the hood next to battery

1990 Buick... | Answered on Mar 01, 2015

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90 buick lesabre seems kill fuel pumps

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