Question about 2000 Buick Park Avenue

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Dirty egr valve effect mpg

Car has 126000 miles

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The valve opens allowing exhaust into the intake manifold cooling the temperature of the combustion inside the cylinder. -------------------------------------------------------------------------------------------
Super VAG K+CAN V4.8

Posted on Jan 22, 2013


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yes- the computer is picking up a problem in the transmission [which has about 20+ codes of its own]trans fluid is a reddish burgundy color like power steering fluid when brown means burnt something slipping-or overheating- or clogged filter -change fluid and filter can b an easy fix if caught in time

Posted on May 05, 2010

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Code P0405

CEL on, P0405
that dont effect engine running, nor can many more DTC>
DTC = errors.
405 is EGR.
if the egr is stuck open the engine stall.s
if it is not working dead, only the TEST FAILS.
true back to 1987 cars. (about)
its federal mandated test in the USA from then.

EGR is kinda simple on newer cars.
its a valve. and some have read back. telling the brain
hey, i didnt move.
id clean it first.
- EGR volume control solenoid valve
- EGR volume control solenoid valve harness is open or shorted
- EGR volume control solenoid valve circuit poor electrical connection
- EGR temperature sensor and circuit

Jun 25, 2014 | 2003 Mitsubishi Eclipse Spyder

1 Answer

Average feul mileage is only 9.4 mpg./why?

Could be a combo of components that are causing your poor fuel mileage.
Dirty air filter is the 1st thing to check - after that.
1) Oxygen sensor
2) Knock sensor
3) EGR valve
4) Spark Plugs/ Wires/ Ignition components
5) Restricted Exhaust

Dec 30, 2011 | 1993 Cadillac DeVille

1 Answer

Losing gas mileage, why? losing an estimated half a mile per mile

The most common cause for loss of mileage is the engine not being properly tuned. Resrtricted air filter, spark plugs, dirty injectors, dirty egr valve, fuel filter, under inflated tires. These are the basics....I hope this helps.

Sep 18, 2011 | 2005 Nissan Pathfinder

1 Answer

I have a 2005 toyota corolla automatic 1.8 with 109,000 miles. I replaced the spark plugs, oxygen sensor, air filter, gas cap, changed the oil, put new tires on, emptied the trunk and I still get 21-23...

Instead of an EGR valve you have variable timing on your cam shaft. I would talk to a Toyota dealer. There may be a service bulletin about replacing the ECM (control box) for the variable cam timing which would effect the fuel economy of your vehicle the same way a stuck or plugged EGR valve would.

Jul 13, 2011 | 2005 Toyota Corolla

1 Answer

Check engine light on. code 71

The Code 71 points to a problem with the EGR Gas Temp Sensor. This sensor measures the temperature of the exhaust gases present at the EGR valve and sends this information to the ECU. The ECU compares this reading to its programmed nominal value to confirm proper EGR system operation. If the temperature is too high, the ECU senses that exhaust gases are not being recirculated and NOx emissions will be abnormal. With this sensor faulty it can very well effect fuel delivery, which can lower MPG's (sample Camry engine).


Carbon build up on the EGR valve? There's always a possibility given the age of the vehiclee, but seeing as you are experience a loss of MPG's and have a straight forward Code71, i'd suspect a faulty sensor. Obviously cleaning the EGR ports is always a big help, but i'd venture to say that faulty sensor is playing a big role as well.

While replacing the sensor, clean the sensor's port and clean the EGR ports and you should see an improvement. The EGR Valves on these vehicles are fairly solid, and I don't think it will require replacement. Just a good cleaning of all the EGR related items/ports.

Hope this helps (remember to rate this answer).

May 25, 2011 | Toyota Camry Cars & Trucks

1 Answer

Po402 code hard on fuel, still has power,

you are having a faulty EGR "Exhaust Gas Recirculation" problem, its a common problem on these trucks, its making your exhaust gasses enter the intake manifold again and becouse they are so hot they vaporize the fuel so your ecu adds more fuel to compensate the mixture but your Mpg miles per galon sky rocket,replace the EGR unit it consists of a solenoid and a valve most times is the valve that cloggs due to exhaust carbon deposits its in the intake manifold, check for an exhaust line going to the intake there is your egr system, good luck please rate

Apr 05, 2010 | 2002 Ford Escape

2 Answers

My valve taps until my motor gets warm how do i fix it

Take it to a mechanic who can adjust the clearances.

Oct 24, 2009 | 2002 Ford Explorer

1 Answer

I have an 20005 renault grande espace dynamique

they are prone to problems with the EGR valve sticking open, causing this, often black smoke is there too

Sep 25, 2009 | 2000 Renault 181

2 Answers

Had the EGR changed on my 2.2d X Type Jaguar and now the fuel economy according to the trip computer is 35/39 instead of 42/44 mpg. If I disconnect the battery will that cause the ECU to reset and...

when ever you change any electrical item for engine manegment you have to reset the computer or else it could your ecu to not work properly which could ****** your gas mileage

Dec 19, 2008 | 2002 Jaguar X-Type

1 Answer

MPG 16-17, with 93 octane in my Hyundai XG 350 L-WHy?

Incomplete combustion due to ignition problems, poor compression, worn or broken EGR valve, sticking injectors, old O2 sensor, dirty air filter, and just about anything else that affects how well the engine would run. Start with a code scanner to find out if there are any stored fault codes.

Jun 17, 2008 | Hyundai Motor 2005 XG350

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