Check engine light on code P1640

Answered in this link. Plus pictures on the Parts websites. Follow the fuel line from the tank. It is a small metal cylinder.

https://www.google.com/search?q=1993+oldsmobile+eighty-eight+royale+replace+fuel+filter

..

So if it is tight and it does not leak, leave it. Just remember you will have to remove the Radiator next time you flush it. It is a 1995, so unless it is a keepsake or show piece, then leave it.

The petcock is usually metal at that year unless it was replace.

e

An O2 sensor that is not functioning correctly or is reading a lean or rich fuel mixture turn on the check engine light in the dash, this is an Orange indicator. There are other reasons like the heater circuit in the O2 is defective, that is a different code. On this car you can read the signal out of the O2's using a special tool called a scanner, it plugs into the diagnostic port under the dash in front of the driver.

I'm assuming that you are refer to the "firing order", so check this...

1995 Oldsmobile Eighty-Eight Royale FWD 3.8 liter V-6 VIN "K"
and
1995 Oldsmobile Eighty-Eight Royale FWD 3.8 liter SC V-6 VIN "1"



1995 Oldsmobile Eighty-Eight Royale FWD 3.8 liter V-6 VIN "L"




Hope helps (remember comment and rated this).

I know if a fuel pressure regulator diaphram goes, it will emit fuel fumes in engine compartment. may not be but this is worth a try. a leaking regulator can cause hard starting, poor fuel economy, stalling, check engine light, gas smell under hood. take a fuel pressure reading. In most of the cases, the fuel pressure should read 45 p.s.i. to 55 p.s.i. for the injection mechanism and 14 to 18 p.s.i. in a throttle body injection assembly. Even a slight variation from the specified extremes may be acceptable, but a large deviation is a sign of problem and bound to result in engine failures. check fuel filter first.

1994 Oldsmobile Eighty-Eight Royale FWD 3.8 liter V-6



Good luck (remember rated this help).

You need a new computer

P1640 Driver 1-Input High Voltage
P1670 Driver 4
have a look here for more codes and info......if this helps, would you leave feedback for me please....thanx
http://www.engine-light-help.com/oldsmobile-check-engine-light.html

Code 12 is always the first code flashed it is just telling you that you have good communication with the ECM,your other 2 codes are for a O2 sensor problem.

Did you check earth connection of electric system?