Using an AutoXray 5000, I have an "oil temp sensor low" in the current codes, but the SES comes and goes, it does not stay on all the time. In historical codes, I have "EGR failure". EGR duty, with engine running, is 0% with little to no throttle, but rockets when the accelerator is pushed slightly. I also noticed that the RPM reading on the scanner corresponds well with the tach when at idle, but lags the tach about 250 RPM when driving. The car also takes a lot of time to warm up (5-10 miles of driving) even then, the temp hovers around 180. When I arrived at work, I turned the engine off, then started it back up and scanned it. Here are my results;

Desired idle: 800
Engine RPM: 950
Coolant temp: 188.1 F
Manifold Air Temp: 74.7 F
A/C Pressure: 71 PSI
MAP sensor: 0.92 Volts
Throttle sensor: 0.66 Volts
Throttle angle: 0%
Battery voltage: 13.1
Barometric Pressure: 4.78 Volts
Left O2 Sensor: 70 mV
Right O2 Sensor: 83 mV
Block Learn Cell: 16
Left Block Learn Value: 128
Right Block Learn Value: 128
Left Integrator Value: 128
Right Integrator Value: 128
Left Inj Pulse: 2.6 mS
Injector Pulse: 2.6 mS
Mass Air Flow: 7gr/sec
CCP Duty cycle: 0%
Idle air Mtr Pos: 51 steps
Learned Idle Pos: 43 steps
Spark advance: 25
Knock retard: 0
Knock sensor: 6
EGR Duty cycle: 0%
Vehicle speed: 0
Engine run time: 10 sec (turned off, then on again and scanned PCM)
A/C clutch: disabled
A/C: not requested
Fan #1: off (oddly, turns on after start up, then off at 140degrees)
Fan #2: off
Air switch solenoid: on
Loop status: open
Oxygen sensor: ready
R Rear oxygen sensor: ready
Learn control: disabled

If someone is capable of looking at this data and able to see a problem, please let me know or give me some advice, I'm rather new to diagnosing autos. Thank you in advance for any suggestions or help.

 

I have an "oil temp sensor low" in the current codes, but the SES comes and goes, it does not stay on all the time.

You have the oil temp sensor code because the F-Body LT1 does not have an oil temp sensor. The Corvette LT1 does.

In historical codes, I have "EGR failure". EGR duty, with engine running, is 0% with little to no throttle, but rockets when the accelerator is pushed slightly.

EGR does not operate at idle. ITs used mainly when lugging the engine at low RPM in the wrong gear. The scanner is showing you what the PCM is telling the EGR valve to do, not what it is actually doing.

I also noticed that the RPM reading on the scanner corresponds well with the tach when at idle, but lags the tach about 250 RPM when driving.

seems normal


The car also takes a lot of time to warm up (5-10 miles of driving) even then, the temp hovers around 180.

what thermostat do you have? Have the fan on/off temps been reprogrammed from stock?

Desired idle: 800 - normal for an M6

Engine RPM: 950 - normla for it to be a bit higher than programmed on startup, although at 188*F the elevated idle speed vs. coolant temperature should not have any affect. Does the idle ever return to 800?

Coolant temp: 188.1 F - OK

Manifold Air Temp: 74.7 F -OK

A/C Pressure: 71 PSI - OK

MAP sensor: 0.92 Volts - Corresponds to a bit under 30kPa. Very healthy vacuum.

Throttle sensor: 0.66 Volts - OK

Throttle angle: 0% - OK

Battery voltage: 13.1 - OK

Barometric Pressure: 4.78 Volts - Corresponds to about 98 kPa. Seems normal, but what is your altitude above sea level?

Left O2 Sensor: 70 mV - A single frame of O2 data is not meaningful. If the sensors had a steady reading at this level right after you started the engine, it would indicate the AIR pump is running, as it should be.
Right O2 Sensor: 83 mV - same as above.

Block Learn Cell: 16 - Normal, that is the "idle" cell.

Left Block Learn Value: 128
Right Block Learn Value: 128
Left Integrator Value: 128
Right Integrator Value: 128 - Did you just reset the PCM? When you start the engine, the PCM is in open loop. Integrators are always 128 at this time. The BLM's should be whatever was stored in Cell 16 when you shut the engine off.\

Left Inj Pulse: 2.6 mS
Injector Pulse: 2.6 mS - Normal. They will always be equal if the BLM's and INT's are the same on left and right banks.

Mass Air Flow: 7gr/sec - Normal

CCP Duty cycle: 0% - Normal

Idle air Mtr Pos: 51 steps - Indicates the PCM is intentionally holding the idle a bit higher than the programmed 800rpm.

Learned Idle Pos: 43 steps - this is where the IAC motor is programmed to start, in an attempt to control the idle.

Spark advance: 25 - Normal an M6 at that RPM

Knock retard: 0 - Good sign. You never want to see knock retard, and seldom get it at idle.

Knock sensor: 6 - Should be labled "Knock counts"??? It is a field that simply increases as the PCM encounters conditions it thinks may cause knock. In large increments, may cause knock retard. Field continuously increments up until somewhere near 45,000 then resets itself to "0" and starts over.

EGR Duty cycle: 0% - Normal. EGR does not operate at idle

Vehicle speed: 0 - Normal

Engine run time: 10 sec (turned off, then on again and scanned PCM) - OK

A/C clutch: disabled - OK

A/C: not requested - OK

Fan #1: off (oddly, turns on after start up, then off at 140degrees) - are you sure there are no other codes stored in the PCM?

Fan #2: off - Normal

Air switch solenoid: on - have no idea what this is

Loop status: open - Normal

Oxygen sensor: ready - indicates it is warmed up

R Rear oxygen sensor: ready - odd, since your 95 does not have "rear" O2 sensors. Are you sure the first on isn't the left sensor and the second one isn't the right sensor, both pre-cat.

Learn control: disabled - Normal in open loop.

Have you read this:

http://members.aol.com/InjuneerZZ/ScanMast.htm

 

Just printed out a copy of your link. Thanks a bunch for the input. I just read the description of the air switch solenoid, but all I can remember is that it ditributes air to various places. Perhaps it's another name for something you know better...dunno. Thanks for the great literature!!!

Air Switch (On / Off)
An indication of where air from the air pump has been directed in engines
with an air management system. ON means that air has been directed
to the air switch for further distribution. OFF means that air has been
directed to the atmosphere.

 

The air switch, according to the operator's manual.....
Air Switch (On / Off)
An indication of where air from the air pump has been directed in engines
with an air management system. ON means that air has been directed
to the air switch for further distribution. OFF means that air has been
directed to the atmosphere.