Question about 1993 Buick LeSabre

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Those are parts of the EGR system.

Posted on Aug 20, 2008

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How do i solve a p0405 code on my 1998 buick century i've changed the egr valve 5 times ran some sea foam through it cleaned the throttle body out what will i have to do to clear the check engine light...

When you cleaned the throttle, did you also clean out the pathway for the egr valve. I have seen these get completely clogged up. And if they are partially clogged they can pop a code. This also goes for the tube that comes from the exhaust.

Aug 14, 2011 | 1998 Buick Century

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2000 buick lesabre engine code p1404

P1404 - Exhaust Gas Recirculation (EGR) Closed Position Performance The egr valve is stuck possibly due to carbon buildup. It may be possible to remove the egr valve and clean it with throttle body cleaner or induction cleaner.If the pintle can not be unstuck then the valve egr will probably need replaced.

Sep 21, 2010 | 2000 Buick LeSabre

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Picture of egr valve and were it is located


Fig. 11: EGR valve and component mounting-3.0L engine


Fig. 12: EGR valve and component mounting-3.8L engine

  1. Disconnect the negative battery cable.
  2. If necessary, remove the air inlet tube from the throttle body and air cleaner housing.
  3. Label and detach all vacuum hoses from the EGR valve.
  4. Label and detach any electrical wiring harness connectors from the EGR valve.
  5. Disconnect the EGR valve-to-exhaust manifold tube from the EGR valve.
  6. Remove the EGR valve mounting fasteners, then separate the valve from the upper intake manifold.
  7. Remove and discard the old EGR valve gasket, and clean the gasket mating surfaces on the valve and the intake manifold.
To install:
  1. Install the EGR valve, along with a new gasket, on the upper intake manifold, then install and tighten the mounting bolts to 15-22 ft. lbs. (20-30 Nm) on 3.8L engines, or to 106-159 inch lbs. (12-18 Nm) on 5.0L engines.
  2. Connect the EGR valve-to-exhaust manifold tube to the valve, then tighten the tube nut to 30 ft. lbs. (41 Nm).
  3. Connect all wiring or hoses to the EGR valve.
  4. Install the air inlet tube.
  5. Connect the negative battery cable.

Hope this helps (remember comment and rated this).

Jul 27, 2010 | 1995 Ford Windstar

1 Answer

Car starts hard runs good on highway stalls if i dont keep my foot on gas have to push gaspeddl to floor to start replaced plugs wires also idle control in throtal body

So IAC has been replaced. Sounds like a dirty throttle body, EGR valve, or vacuum leak. DId you do the maintenance yourself. If so then you should be able to inspect Throttle Body to determine if black and dirty.. this can cause intake problems leading to your issue adn rough idle. EGR valve sends exhaust gas back into combustion chamber to reburn it and make car more environmentally sound. If stuck open it can allow too much exhaust into combustion chamber causign a lean mixture, too much air can cause this.. Vacuum leak can also allow too much air in. Start with easiest and check Throttle body, then EGR valve, finally for vacuum leaks. Depending on your skill the EGR can be cleaned as can the throttle body.. a good link for TB cleaning is A vacuum leak may be harder to diagnose. You are compensating by depressing gas pedal telling ECM to send more fuel to motor to overcome this issue thats why it will run and start with gas pedal pressed.

Jun 08, 2010 | 1998 Saturn SL

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When I start the car it idles high the rpms go up and down

Sounds like you have a dirty EGR (Exhaust Gas Recovery) Valve. There are three things that I think of looking at when someone mentoins uneven running at idle 1) Idle speed air control valve (IAC) - this is small port that is electronically controlled that allows air passed the throttle flap at idle to maintain idle speed. You say you have swapped out your throttle body but it might be good to check that the IAC is clean as most Hondas often fall prey to the same age related faults - spray inlet port with carburettor cleaner and use a bit of old wire to hep clear out any gunk after about 20 minutes. IAC faults generally have the symptom of the car being very reluctant to start but will fire up when given lots of gas. However,as soon as any demand is made on the engine such as power steering or simply engaging the brakes to come to a halt the car will often cutout. 2) Throttle Position Sensor (TPS) tells the engine management system whether the throttle is closed or if open by how much. The symptoms are random often wildly erratic engine idle speeds. 3) The EGR valve - this system is designed to introduce a little exhaust gas back into the inlet manifold to keep the engine ignition temperature low enough to avoid the production of nitrous oxides in the exhaust. This valve looks a bit like an alien space ship about 75mm in diameter. On it top face there is a small vacuum line connector, This vacuum line is connected to the inlet manifold but it may pass through a solenoid valve on the way. This solenoid is for the Engine management system to temporarily prevent the vacuum at engine start up from reaching the EGR thus keeping it closed; the engine temperature is not nearly hot enough, when starting, to cause nitrous oxides in the exhaust. The vacuum introduced to the EGR body pulls on a diaphragm which lifts a valve, immediately beneath to open and this allows a regulated amount of exhaust to pass into the inlet manifold. Connected to the underside of the EGR valve is a metal pipe connected to the exhaust manifold. Faulty EGRs are down to either encrusted carbon deposits holding it open or a broken diaphragm keeping it closed. If closed the engine runs hot and pinks and knocks all over the place. The pipe to to the exhaust manifold can get clogged with carbon deposits and this has the same effect as having a closed valve. If open the car idles unevenly behaving as if there is a leak in the manifold, the open valve is actually just that. Locate the EGR near the throttle body, from the above description you will know it when you see it. Remove the vacuum hose, any electrical connections and undo the retaining bolts and lift clear. Clean everything to like new - the carburettor cleaning spray is again useful here . Applying some suction to the hose connection on the EGR you should see the valve opening and closing. Push a bit of flexible braided (a cut off of handbrake cable is ideal) wire, frayed at the end, to sweep the exhaust connection pipe clean of encrusted carbon. Reinstall everything and fingers crossed job done

May 01, 2010 | 1991 Honda Accord

1 Answer

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 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.)

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

2 Answers

Stalls at idle no fluxuation in voltage at iac

It is most likely the EGR (Exhaust Gas Recirculation) valve.
The valve is supposed to close when the car is idling and open other wise.

Inspect it / Replace it.

Hope this helps!

Sep 17, 2009 | 2003 GMC Sierra

3 Answers

2001 ford explorer sport,6 cylinder,rough idle and stalling....unplugged mass air sensor...seems to idle fine then...can u help me?

If there is a Auto Zone around your area, have them scan the Explorer for any DTC codes since it's fee of charge. But in the mean time buy a can of MAF cleaner and follow the instructions and also buy a can of Trottle body cleaner and follow the instructions on the can. Clean the MAF and the Throttle body, also try to get the Idle Air Control falve cleaned too which is on the throttle body. So use up the whole can of Throttle body cleaner and it would not hurt to use two cans. Once everything is cleaned that should fix the problem, the other thing to that would cause your poor idle and stalling is a bad or dirty EGR valve which can be cleaned with Carburetor cleaner since it's stronger then the Throttle body cleaner, just remove the EGR and spray the Carbon build away and place back in place. Note: the Carb cleaner is to strong for the gaskets used on the throttle body so don't use it on the throttle body. Good luck and this should help get your Explorer running 100% soon.

Jul 09, 2009 | 2001 Ford Explorer Sport

2 Answers

Check engine light came on codeP0401

Yes, this is a carbon issue. the EGR valve is very sensitive to carbon deposits. i suggest using pressured air to clean out this throttle body before you purchase another valve. it will keep rejecting the egr if its not cleaned.

Mar 07, 2009 | 1996 Honda Accord

1 Answer

Throttle sensors going bad

I had similar problem with my 1994 Buick LeSabe. after clening EGR valve and idle valve the problem almost disappeared. use trottle body cleaning liquid. be carefull with a gasket otherwise you will need to buy a new one. New EGR cost around $12037e8c8b.jpg

Mar 01, 2009 | 1988 Buick LeSabre

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