Question about 2001 Pontiac Bonneville

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Troubleshooting p0446 and p1404

Troubleshooting p0446 and p1404

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  • Anonymous Mar 26, 2014

    troubleshooting P1404


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  • Pontiac Master
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P1404 is a common problem on GM cars and trucks. You might have some luck cleaning it (carbon deposits). Use carb/choke cleaner but be careful where you spray it. Once you clean it, you will need to erase the error code. You can try one of the Auto Parts stores that will 'lend' you a scan tool. Another trick is before you clear the code(s) and after you have cleaned the EGR, unplug the connector to the EGR valve. Clear the codes, turn the ignition switch OFF immediately after you clear the codes. Reconnect the EGR connector, remove the Scan Tool and start it up. By turning the key off immediately, it resets the pintle position of the EGR valve. Otherwise it 'remembers' the old position and you will get the error code back. Worth a try before you invest in a new EGR valve...

Posted on Nov 20, 2009

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  • Pontiac Master
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STOP TOPPING off the tank while you gas up.

Few ounce of fuel in the EVAP vapor can stock a perfect engine from running.

Disconnect the charcoal canister line and let the car vent OUTDOOR over night.

you other problems

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE

Also remove carbon built up behind the EGR valve and the EGR passage tube.


Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.


EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.

Take it for a test drive.

Please rate my answer if it's useful to you.



Posted on Dec 19, 2009

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  • Master
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The po446 is the evaporative emission system.Check all the lines going back to the fuel tank.This is for a restriction in the vent system.Usually a vent valve not working.It is under the vehicle by the gas tank connected to the canister.The 1404 is for the EGR valve.If the vehicle is running good it is stuck closed.If it is running rough it is stuck open.Usually stuck closed.It is under the hood on the engine by the rear of the back velve cover.Good luck.

Posted on Nov 20, 2009

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What does trouble code P0171 for a 2002 Buick Park Avenue mean?

Trouble Code: P0171 (3.8L V6 VIN 1 Auto)
Fuel Trim System Lean (Bank 1) Print this code dataprint_icon_codes.gif Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
DTC P0101-P0103, P0107, P0108, P0121-P0123, P0130-P0138, P0140, P0141, P0201-P0206, P0300, P0401-P0405, P0410, P0440-P0446, P0506, P0507, P1404 or P1441 not set, engine started, vehicle driven at less than 82 mph at 550-4000 rpm, BARO sensor over 70 kPa (10.1 psi), ECT sensor from 68-230ºF, IAT sensor from 64-158ºF, MAF sensor from 2.8-150 gm/s, MAP sensor from 16-105 kPa (2.6-15.2 psi), fuel level over 10%, and the PCM detected the Long Term fuel trim value was more than +20% for 6 seconds. The PCM controls the air/fuel metering system to good overall fuel economy, driveability, and emission control. During open loop, the PCM determines fuel delivery based on sensor signals, without the oxygen sensor input. During closed loop, the PCM adds oxygen sensor inputs to calculate Short and Long term fuel trim fuel delivery adjustments. Short Term fuel trim values change rapidly in response to changes in the oxygen sensor signals. Long Term fuel trim makes coarse adjustments in order to maintain an air/fuel ratio of 14.7:1.

Possible Causes:
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  • Fuel control sensor is out of calibration (ECT, IAT or MAF)
  • Low fuel pressure (fuel filter clogged, pressure regulator failure)
  • One or more injectors restricted or pressure regulator has failed
  • HO2S element is contaminated, deteriorated or has failed
  • Vacuum hose is disconnected, broken, leaking or loose

Troubleshooting:2002 Buick Park Avenue, 3.8L, P0171

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