Question about 2002 Pontiac Grand Prix

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I have a code of lowair flow egr valve and have changed to valve and cleaned the throttle body housing with cleaner. servie engine light still comes on with the same default but not all the time.

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Hello! This is a somewhat common issue where there is an excessive buildup of carbon in the EGR port in the upper intake manifold.
This is the EGR Valve as removed from the engine:

i have a code of lowair flow egr valve and have - 52a1105.jpg
On your vehicle, you will notice that the flexible tubes are held in place by one bolt each. If you remove these tubes from the engine side only - you will be able to clean inside the port that they connect to. I have had good luck using a parts cleaner that any Chrysler dealership sells - it makes short work of carbon build up. Once you have the ports cleaned out - reassemble the EGR tubes to the intake. Be sure to get them seated fully before you tighten them back down.


Hope this helps and good luck!

Posted on Sep 25, 2009

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Ford 4.6L Engine and P0401 Insufficeint EGR Flow


The P0401 code refers to not enough flow of the EGR system. Most common problem for the Ford 4.6L engine, is the flow ports in the throttle housing. If you have this code, try this procedure first, before spending any money.
First remove the two EGR valve mounting bolts. Leave the pipe connection connected to the valve, then remove the air intake tube to the throttle housing. Next remove the throttle housing from the intake by taking out the screws that hold it in place, and disconnect the throttle linkage.
Remove the housing and turn it over, look at the ports (holes) for the EGR valve, they will most likely be covered with carbon crud. Clean these ports out completely, reinstall the housing and tighten all the bolts, reinstall the linkage and air intake tube. Clear the code with a reader, and test.

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FourthFordTruck user_offline.gif Senior UserGarage is empty, add now Join Date: Jan 2004 Location: Tulsa, Oklahoma Posts: 227 reputation_pos.gif , I would take the egr valve back off, remove the throttle body housing, and clean the two egr ports and passage inside the throttle body housing. That is what cleared my low egr flow code. I've read alot of people replace the dpfe for this code and it doesn't help.
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Dear Sir, I have a 1997 Jeep Cherokee Sport, 6 cylinder 4.0 liter. I recently tried cleaning my throttle body with carb cleaner while the vehicle was running. After spraying a half can of cleaner in the...


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Does anyone have engine schematics for a 2003 pontiac 3.1 V6? Or know of a site where I can find engine schematics? I have to replace an EGR Valve but don't know where it is located.


If you don't know where the EGR Valve is located, it is safe to assume that you did not properly diagnose your EGR system...how do you know the valve needs replacing?

If you are trying to fix a trouble code P0401 " Exhaust Gas Recirculation (EGR) Insufficient Flow" (This is a very common code with 3.1L GM Engines)
An EGR Valve replacement will most likely make you about $125 poorer than you were before and will not fix the problem.

Your EGR port into the intake manifold is most likely clogged up and needs to be cleaned out.

You will need a Throttle Body Gasket, an EGR Gasket, a can of ThrottleBody and Intake Cleaner, and a little antifreeze. (You will lose just a little when you remove the throttle body.)

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Remove the EGR Valve and the Throttle Body. Use a screw driver or pick to chip out the carbon buildup in the EGR port going into the intake manifold. You will probably have to work it from the intake side as well as the EGR side to get as much of the black carbon out as possible. Be careful not to let this stuff go down into the intake plenum - you will burn some valves if it gets in there. Then use the Throttle Body and Intake cleaner to finish the cleanup. (It helps to take a rag and stuff it into the intake manifold just past the EGR port to catch the gunk so it doesn't go down into the plenum...just don't forget to remove the rag before putting the Throttle Body back on)

Put everything back together and top-off your antifreeze and clear your computer codes. That should fix it.

Oct 27, 2009 | 2003 Pontiac Grand Prix

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OBD code P04001 Insufficient flow, I changed the


did you clean the EGR passages? take the valve back off. one hole will have exhaust, the other should have strong vacuum.ususally the passage gets plugged with carbon, from the valve to where it goes into the intake manifold. you may take a wire and carb cleaner to clean the passage.

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Frank
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Check engine light came on codeP0401


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Mar 07, 2009 | 1996 Honda Accord

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CAR LOOSING POWER. CHECK ENGINE LIGHT ON. ONLY CODE IS CYLINDER 2 MISFIRE. JUST HAD A COMPLETE TUNE UP. TRIED NEW MASS AIRFLOW. THINKING IT MUST BE THE ECU COMPUTER. THERE IS A MAJOR HESITATION IN...


I have a 1999 Protege 1.6L with 93,000 miles. And a
1996 1.5L with 170,000 miles.
When my light came on, I got the EGR code read out at Advance Auto ($0). I googled 'Mazda EGR' and found this is frequently due to carbon buildup in the throttle body. It seems the carbon restricts the flow from the EGR, which then calls for a more open valve, and the error code is "excessive flow". Go figure.

Very easy to disassemble throttle body (just check to see where the EGR line is attached to the intake air path, just prior to injector assembly). Sure enough, a clump of carbon around the EGR port in the throttle body. Cleaned it up with a paper clip, Q-tip, and carburetor cleaner. Total cost < $3.
Cleared to code. No light on now, car runs fine.
If your "EGR VALVE" is bad,
you can get one cheap at the url below, and they take Pay-Pal.
Then you can install it of have it installed.
http://www.autoparts123.com/?gclid=CJual4Dv65gCFQS7sgodxk592A

Sometimes...
A less expensive fix is to replace the engine Coolant/Antifreeze "Temp Senser"
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Also replace the engine coolant "Thermostat",
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You can pick up both at Auto-Zone for about $35.00.
This fixed our 1996 model. The 1999 model was fixed by replacing the
EGR Valve.

Hope this helps.
"Catch me on the flip"
"Mo"

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