20 Most Recent 1990 Buick Riviera - Page 7 Questions & Answers

you need to have a diagnostic engine service done to find problem- they actually pull engine codes

Under hood, passenger side, lower engine area, rear of crankshaft pulley, mounted in timing cover

Not a computer issue. Transmission has problems could be filter stopping up, which also means problems.

have a professional replace it with a new valve, Be sure that the shop cleans the EGR passages when the EGR valve is replaced. If the EGR system ports are not cleaned, the new valve is at risk of premature failure.

Time for a rebuild, or used trans.

The light sensor is in the dash board top about 2/3rds of the way over toward the passenger side. You will see 3 or 4 small slits, and that is where it picks up the light, or absense of light. Is the twilight control switch, located under the main light switch, in the position to turn the lights on automatically? It is a slide type switch, and must be slid over to the right for the automatic control to work.

No, you do not need to remove the torque axle bolt to replace the serpentine belt on your 1995 Buick Riviera Supercharged Series 1. However, you may need to use a serpentine belt tool to relieve tension on the belt before you can remove it.

Have you tried looking at EBay? I did a quick search and found this. Not sure if this is what you are looking at but certainly there would be a matching pigtail. Otherwise a junkyard (call before you go) and you can probably get one from another GM car. Full size gm chassis with the same engine

https://www.yourmechanic.com/article/p0171-obd-ii-trouble-code-system-too-lean-bank-1-by-andrew-quinn All codes are OBD II. You can google them fro your answer.

If I remember correctly, it should be on the drivers inner fender in front of the left front tire under the hood. Seems like it should be hiding behind the washer bottle or the coolant reservoir.

Should be under the dash, behind left hand side of the instrument panel to left of steering column.

I would anticipate 9 quarts or liters if the torque converter is also dry. Most fluid will go in the converter with only a quart or so in the pan.

I tried the DIY service and repair manuals from a website and it actually helped me repair transmission problem in my jcb 3cx site-master. it wont move forward or reverse, engine is good both solenoids for forward and reverse work. I don't have much technical knowledge but I just followed it step-wise, and works perfect! got it from www.reliable-store.com

Float setting and needle valves are big issues here with what you describe.

Fuel pressure regulator maybe . Do you know where it is on the fuel injector rail . With the vehicle running pull the vac, hose off . Does the rpm go higher ? Is there fuel leaking out the end of the regulator ?

The pump will but the sending unit is different and that is all part of the so called "Pump Module"

IF you have a serpentine belt it's not a matter of adjusting the power steering belt tension because it's done automatically with a serpentine belt tensioner. OTOH, if you have a separate V-belt you'll need to loosen the mounting bolt/nut at the bottom of the steering pump and the adjustment bracket then tighten the belt by moving the adjustment nut to tighten the belt. You might be able to google a video of your particular engine power steering belt adjustment.

If you lost a vacuum line then the heater would let hot air out the vents with or without the fan motor running. Do this test with the engine up to operating temperature Touch both hoses with the heater on and temp control to the hottest position. Now check the temperature of both hoses. They should be the same. If not that indicates a blockage of water to the heater core. Test the water flow valve too. It can be plugged with rust or not moving to let water into the core. The core itself can be plugged too. If you really need a hose diagram, a Chilton's manual will be your source of information. The engine won't idle well with a vacuum hose off.