Question about 1999 Chevrolet Express

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I HAVE A 1999 CHEVROLET EXPRESS VAN ,4.3L.I HAVE THE CODES FOR EGR VALVE AND THROTLE POSITION SWITCH,BOTH ARE NEW,ALSO I MADE A MAYOR TUNE UP AND REPLACE THE CATALITIC CONVERTER,AND STILL HESITATE AT 25 OR 35 MPH,IN THE HIGHWAY RUN VERY GOOD ,AND THE PROBLEM IS INTERMITENT,SOME TIME IS WORSE SOME TIME LESS,THE SAME PROBLEM AND CODES BEFORE AND AFTER ALL THE REPLACED PARTS,IN THE HIGHWAY IS GIVING 14 MPG,COULD YOU HELP ME?

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YOU NEED TO CLEAR THE CODES WITH AN OBD-II CODE READER! AND GO FROM THERE! THE CODES ARE IN THE COMPUTER MAKING IT THINK THE PROBLEM IS STILL THERE!

Posted on Mar 11, 2011

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Posted on Jan 02, 2017

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Rough idle 95 astro van, I did a full tune up , plugs,wires,cap, rotor,air filter,and fuel filter and cleaned egr vavle.


I actually had to replace my EGR valve and the gasket. I clean the valve well and reused both. I don't think the gasket sealed well enough though. So I went ahead and got a new valve, gasket and changed them. It runs a lot smoother now.

Dec 14, 2012 | 1995 Chevrolet Astro

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I replaced the EGR on my 1999 saturn due to a P1404 code. After driving it for about a week code came back. The idle was not stable, this was the reason why I replaced the EGR. Now the idle is rough at...


i would remove the egr and just the passage to make sure it is not filled with carbon. common problem. here is some info for you as well.

Circuit Description
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The linear EGR system consists of a linear EGR valve, the PCM, and its associated wiring. The EGR valve solenoid is controlled directly by the PCM when certain conditions have been met. The PCM contains a diode feedback circuit which dissipates energy when the valve is cycled OFF. When the PCM commands the EGR valve closed, a closed valve position value is learned. If the PCM commands the valve closed and the actual feedback value does not match the learned values, DTC P1404 will set.
Conditions for Setting the DTCImportant: When the PCM recognizes that the parameters for setting DTC P1404 have been set, the diagnostic software waits until the EGR cycles open 50 percent or greater 4 times and then resets. If after the 3 cycles the actual vs learned is not within the parameters, the DTC will be stored and the MIL, service engine soon, will be commanded ON.
Important: When this DTC sets, functions will be disabled. When repairs are complete, codes must be cleared and the ignition keyed OFF for at least 10 seconds to allow proper operation.
DTC P1404 will set when the actual closed value does not match the learned closed value within 20 seconds if:
• RPM is below 5,000 and the actual vs learned is greater than 0.2 volts. OR • RPM is above 5,000 and the actual vs learned is greater than 0.4 volts. Diagnostic Aids • Check for backed out or damaged terminals. • Check for a stuck open EGR pintle. Inspect the EGR pintle valve bore for carbon or debris and remove. Verify that the pintle moves freely and the return spring forces the pintle closed. • An open in circuit 452 will result in DTC P1404. • A short to ground is circuit 697 will result in a severe rough idle and driveability complaint and set a DTC P1404. • Compare the learned closed pintle position to the actual closed pintle position with the key ON and the engine OFF. If voltage differs more than 0.15 volts, check for backed out, damaged, poor terminal tightness, or an intermittent open in circuits 416 or 1456.
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Jul 29, 2011 | 1999 Saturn SL

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I have a 1997 Astro van that runs very ruogh at


check the throtle position sensor(TPS) that maybe the problem.

Sep 13, 2009 | 1997 Chevrolet Astro

1 Answer

98 ford windstar dies down when giving gas


spark plugs tune up, egr valve open or not fully closed, throtle position sensor, timing.

Feb 18, 2009 | 1998 Ford Windstar

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