Q: 1995 Riviera 3800 Series II check engine light on and won't shift into O.D. at all but engine runs colder than usual.

asked by on

Buick series II non-supercharged, revving @ 1100 to1400 RPM one morning. Back to normal the next day, but check engine light is on and car will not shift into O.D. Smooth running and shifting. Very well cared for and seldom, if ever, goes over 2500 RPM under any circumstances. Trans fluid changed every 25k miles. Fluid red and normal. Temp gauge runs cold most of the time now. I did change to 180 degree thermostat while changing the water pump months ago, but was steady in all temps until three days ago. Hard to find diagnostics on 1995 model.

My car has 180000 miles.
My car has an automatic transmission.

If the engine does not reach operating temperature in a certain time the computer will go into open loop and may even lock out the overdrive if the problem continues. You will need to check engine codes to do pinpoint test on the codes stored and if thermostat is stuck open then it may need replaced or you may have a coolant sensor failure.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. 1995 Riviera 3800 Series II check engine light on and won't shift into O.D. at all but engine runs colder than usual.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Check Engine light coming on and car bucking.

A flashing check engine light is a warning that there is a misfire in the engine that will damage the catalyst in the exhaust. The catalyst is what cleans up the exhaust emissions that come out of your engine. The...

Q: Q: The car shut off during driving

Hello. Though this can be caused by a number of things for your 1998 Buick Riviera, it sounds like you have a belt that failed. When the belt fails and comes off, this symptom will occur. The loss of the...

Q: I have a 1995 BMW 318Ti 97K miles. The ignition position seems to be moving further and now the key is parallel in the start posi

Hi Rick. Thanks for contacting us today. The ignition cylinder is made up of multiple tumblers and springs, that all work together to activate independent positions for the key and the cylinder to activate. If the key is moving forward...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...