20 Most Recent 1990 Buick Riviera Questions & Answers

If cruise control main light comes on but you cannot set a speed (no set), you could have a bad brake pedal switch.
(If the cruise control light comes on, chances are that it is NOT a fuse issue).
Some vehicles have two switches (one for brake lights and one for cruise control cancel) and others have a multifunctional, single switch.
The function to cancel cruise control is very sensitive so it only takes a small movement of the pedal to cancel cruise control.
You can try lifting on the brake pedal while trying to set the cruise, but this does not alway work. Replace switches are pretty cheap (less than $30) and pretty easy and quick to replace.

1990 Buick... | Answered on Mar 04, 2019

Visit the on-line store, known as reliable-store, they have the repair manuals. I'm sure you will get the solution of your problem.
Best Manuals

1990 Buick... | Answered on Dec 21, 2017

It's possible the timing chain slipped a link, but you should follow the usual troubleshooting steps at the link below.
Do It Yourself Diagnosis and Repair

1990 Buick... | Answered on Nov 11, 2017

In this case check the fuses might be blow out or the wires are broken first try checking the fuses

1990 Buick... | Answered on Apr 09, 2017

You may not have one. If you have a Mass Air Flow sensor, very possible there is no map sensor.
I have a '92 LeSabre, and it does not have a map sensor, only the MAF sensor. I have seen a 2005 Buick Century that has both the MAF and a map sensor. On that one, the MAP sensor is on top of the intake manifold, on the passenger side of car.

1990 Buick... | Answered on Mar 30, 2017

A defective starter that hammer blows can't fix

1990 Buick... | Answered on Feb 27, 2017

Fuel filter dirty throttle body,any codes?

1990 Buick... | Answered on Nov 10, 2016

There is no adjustment, it is completely automatic.

1990 Buick... | Answered on Aug 03, 2016

look behind the grill in front of radiator

1990 Buick... | Answered on Jun 14, 2015

Either it's time for a major tune-up, or your fuel system is losing pressure.
To test this, when first starting the car in the morning, turn the key off and on to the count of ON (five seconds) OFF (five seconds) three or four times, then turn the key to ON and leave it for five seconds or more. Then, start the car and see if it is still difficult to start. If it starts more easily, the fuel system is losing pressure overnight.
Verify that at least 35 psi is retained at the fuel rail overnight. If the pressure is less than 35 psi in the morning after the vehicle as sat overnight, replace the fuel pressure regulator and check for fuel leaks from the rail or supply lines. Check the fuel pump to be sure it is properly operating and that the check valve is not allowing fuel to bleed back into the tank.
If your fuel pressure retention at the fuel rail is good, it's just time for a major tune up.
If you've been using ethanol blend fuel in that vehicle, you may have a moisture contamination issue with the fuel, and you'll need to replace ALL FUEL in the vehicle as a diagnostic measure. Try to avoid using ethanol blend fuels in that vehicle if at all possible.

1990 Buick... | Answered on May 18, 2015

Check all fuses with a 12 volt test lite

1990 Buick... | Answered on May 17, 2015

On the rear suspension crossmember at the right side of vehicle

1990 Buick... | Answered on May 17, 2015

Would you be referring to cowl induction?

1990 Buick... | Answered on May 17, 2015

Could be an Instrument cluster failure. It's a common problem in 1990 Rivieras. I suggest you take it to an auto mechanic that specializes in electronics.

1990 Buick... | Answered on Apr 04, 2015

On models prior to 1996 you can disconnect the battery cable for 60 seconds to clear the trouble codes and turn the warning light off. But if the problem has not been fixed the light will come back on.

1990 Buick... | Answered on Aug 05, 2014

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