Question about 2004 Chevrolet Blazer

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2006 malibu, check engine light came on. had it checked and it said egr flow problem. how do i narrow it down.

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  • Chevrolet Master
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Remove egr valve and clean the hole and egr itself
and reinstall

hope it helps

Posted on Oct 18, 2013

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  • Master
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The egr may be a misread,,change the air flow filter and see if that helps ..it does not take much to make any engine light to stay on ..I feel it is a misread

Posted on Oct 17, 2013

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Posted on Jan 02, 2017

blueextc3221
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SOURCE: Insufficient EGR Flow problem

Specifically DTC P0401 is "Exhaust Gas Recirculation (EGR) Insufficient Flow". Now this is where we have to be careful when we read a code. In this case it is not saying the EGR valve is bad, it's saying the EGR flow is too low. Now it could be because the EGR valve is bad. Or it could be a clogged EGR tube or a broken vacuum line. This is why you have to be careful and check the whole system before you go changing parts. The PCM tests the EGR system during deceleration by momentarily commanding the EGR valve to open while monitoring the Manifold Absolute Pressure (MAP) sensor signal. When the EGR valve is opened, the PCM should see a proportional increase in MAP. If the expected increase in MAP is not seen, the PCM notes the amount of error that was detected and adjusts an internal fail counter towards a fail threshold level. When the fail counter exceeds the fail threshold level, the PCM will set DTC P0401. The number of test samples required to accomplish this may vary according to the amount of detected flow error. Normally, the PCM will only allow one EGR flow test sample to be taken during an ignition cycle. To aid in verifying a repair, the PCM allows twelve test samples during the first ignition cycle following a scan tool Clear Info or a battery disconnect. Between nine and twelve samples should be sufficient for the PCM to determine adequate EGR flow and pass the EGR test. To check the system first you need to remove the EGR valve and if it is clogged or broken. If it is, clean or replace it. If it is okay, then remove the EGR inlet tube from the exhaust manifold and the EGR outlet tube from the intake manifold. If either or both are clogged, clean them out or replace them. Then check the ports in the manifolds themselves to see if they are clogged. If so, clean them out. When you are done, disconnect the battery for about 30 seconds to clear the code and drive the car to see if the light comes back. This should take care of the problem. If not, then you will need to put a scan tool on the car and see what the EGR control system is doing wrong and correct it.
The Valve on this car is electronic, so, unfortunately a vacuum pump will not work for testing.
If you have a scan tool, you can command the pcm to open the valve to see if the valve itself is working.There are really only4 things to go wrong with these things, PCM, wiring,the valve itself, or plugged passages. I have never seen the pcm cause this problem, or the wiring for that matter. If you say you have pulled the EGR and checked the intake passages, then I would be pretty confident in saying the the egr valve itself is bad.
Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Posted on Mar 18, 2009

  • 16 Answers

SOURCE: EGR problem

did u try cleanning out the lines connected to the egr they usually have a lot of hydrocarbon build up

Posted on May 13, 2009

  • 4 Answers

SOURCE: hold light blinking, check engine light on, engine slows down

check tps sensor (throttle position sensor in backside of the throttle cable) and map sensor (manifold absolute pressure on front little 1 inch sensor with vacuum line) make sure there plugged in. the ecm (engine control module driver side inner fender) and tcm (transmission control module under dash) both need the data to know when to upshift and increase fuel/air. Otherwise the computer runs default values and guesses off of other sensors giving poor performance. also disconnect battery for 15 min. usually resets aveo service lights if you dont have a scanner.

Posted on Aug 02, 2009

arauzvictor1
  • 466 Answers

SOURCE: chevy malibu check engine light on code P1665 what

P1665 Evap vent solenoid control circuit

Posted on Aug 30, 2009

  • 2841 Answers

SOURCE: bad egr valve

You can try cleaning it. Go to your local parts store and buy a can of brake cleaner. Remove the EGR valve and spray it into the valve and let it set 8 hours. Pour out the cleaner and clean the carbon off with a wire brush. Reinstall the valve and see if that helps. If not, you will have to buy a new one and it will not cost $316 if you DIY.

Posted on Oct 18, 2009

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How many miles is on the odometer?

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Does this happen when the engine is cold (during start up)?

A intake manifold leak will progressively get worst when the engine get to operating temperature (195-210F).

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