Question about 1992 Chevrolet Lumina APV

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I have a 92 lumina with a 3.1 it is running rich missing etc. i replaced the egr and throttle position sensor still no effect

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Check the vacuum line to the fuel pressure regulator and the fuel pressure regulator. You can check the regulator by disconnecting the vacuum line and see if there is any change, but the best way to check is to go lone out a vacuum line pump and connect it to the regulator. The fuel pressure regulator is on the fuel injector rail by the throttle body. If you go to Auto Zone they can lone out the vacuum pump and give you step by step instructions to checking the regulator. Good luck and hope this helps and have them scan the car since it's free of charge to scan there. Good luck and keep me posted, be glad to help. 

Posted on Jul 02, 2009

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Svx runs rich


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Jan 25, 2015 | 1994 Subaru SVX

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1995 chevy luminga wont stay runing, and I have replaced a coil, throttle positioning sensor, ignition moduel, and plugs and wires.


run fault codes and check for HO2S and O2 sensors problems . Check fuel pressure and injectors for operation.

Apr 19, 2014 | 1995 Chevrolet Lumina

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4.0L ford ranger runs rough misses under load, idles fine and under full throtle it runs with good power but when you try and go at a constant speed power dies off.. also on left side of engine all 3 plugs...


On the lean area look for a vacuum leak anything there,like PCV hoses and pull the plug on the EGR is there a difference?Is the valve hot at idle? Now check the rich side pull the hose off the fuel pressure regulator is gas leaking out? MAF cant do this, IAC cant do this ,TPS, If everything checks out no vauum no EGR leak No fuel regulator leak you may have to find out if the 02 sensor is reading the correct bank .Bank one could be on bank two, and bank two can be one bank one,It could be mismatched

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1 Answer

Hi, I have an 89 Chevy 1500 with a throttle body. The truck runs rich. The oil pressure gage reads 15 psi when the engine is warm and waiting at a light. It shoots back to 30-35 psi once I get going. Any...


Running rich can be from a bad sensor, such as O2, mass air, temperature, throttle position, etc., which would effect all cylinders and run smooth.
Or from a bad plug or wire, bad compression, etc., which would not effect all cylinders and run rough.

The most common with this age, would be PVC blowby foam coating the air mass sensor. Just take it off and clean it. Then splice long hoses into the PVC, and run it down to a metal container that get cold in the wind, to condense out the oil and water vapors before it gets into the intake.

Your oil pressure is perfectly fine.
On new vehicles, oil pressure can even drop below 10 at idle, and to above 40 when at high RPM.

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1 Answer

KOST 32 EGR pressure feeback fault. 4.9 EFI. Stalls when idling, runs rich


Check and see if the egr is stuck open at idle. It should have ported vacuum on egr valve. If egr is not stuck open, Check throttle position sensor, and map sensor for proper operation. Also check throttle plate for carbon buildup

Mar 13, 2010 | 1987 Ford Bronco

2 Answers

Jaguar xj6 4.0 1990. showing fault code fuel 14, fail 14. what does this code mean ?


2 airflow sensor out of operating range 3 coolant temp sensor out of operating range 4 oxy sensor indicates full rich 5 throttle potentiometer/airflow sensor... (low throttle pot signal with high airflow sensor signal) 6 throttle pot/airflow sensor...... (high throttle pot signal with low airflow sensor signal) 7 throttle pot...idle fuel adjustment failure(idle speed??) 8 intake air temp sensor...open or shorted circuit to sensor 11 Throttle pot at idle: Throttle pot idle trim out of normal range 12 Airflow meter: MAF signal out of range 14 Coolant thermistor: Resistance out of range or static during engine warm up 16 Air thermistor: Resistance out of range 17 Throttle pot: Out of range 18 Throttle pot/Airflow: Low throttle pot signal at high airflow 19 Throttle pot/Airflow: High throttle pot signal at low airflow 22 Fuel pump drive: ECU output to fuel pump relay 23 Fuel supply: Engine running too rich 24 Ignition Drive: ECU output to ignition Amp 26 Air leak: Engine running too lean 29 ECU self check 33 Injector Drive: ECU output to injectors 34 Injector: Looks for Injector dribble 37 EGR Drive: ECU output to EGR switching valve 39 EGR check sensor: EGR not working (normally pipe blocked) 44 Lambda (O2) sensor: Poor mixture control rich or weak (or misfire) 46 Idle speed Control valve: ECU output to Coil AB 47 Idle speed Control valve: ECU output to Coil CD 48 Idle Speed Control Valve: Stepper motor grossly out of position 66 Air pump: ECU output to air pump relay 68 Road speed sensor: Seen speed < 5km/h at high engine airflow 69 Drive/Neutral switch: Seen cranking in "D" or high airflow in "N" 89 Purge Valve drive: ECU output to purge valve
this is all I could find

Nov 09, 2009 | 1990 Jaguar XJ6

1 Answer

Rough running


Try checking Throttle position sensor with an ohm meter. Remove connection, put probes on pins (hit & miss on which ones, but you'll find 2 that give you a reading that increases as throttle is opened) and read meter as you open throttle all the way open & all the way back slowly & smoothly. The reading should go smooth up & down, If it jumps, or doesn't move at all in some spots, it's probably faulty. Have you tried to get any fault codes yet?

Jan 10, 2009 | 1990 Jeep Cherokee Limited

1 Answer

1991 chevy lumina will hardly run


DTC - 22 Throttle position sensor error (signal low), is tps connected?
DTC - 23 Intake air temp sensor error (low temp indicated) check and make sure the sensor is connected
DTC - 43 Knock sensor error, ignore this for now, will not cause rich run.
DTC - 53 System voltage too high, check reference voltage from PCM, it should be around 4.5 Volts, this could be the cause of all your problems, the computer will need to replaced almost for sure.

Oct 06, 2008 | Chevrolet Lumina Cars & Trucks

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