Question about 2004 Chevrolet Impala

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Air flow erg

Replace erg valve and cleaned tubing but engine lite still comes on, they stated not enough air flow how can i fix this problem.

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Could be MAF mass air flow sensor or your MAP sensor manifold absolute pressure. check for a cracked or worn hose going to the Map i had found a crack in mine one time. if its the MAF just see if you disconnect it and if the trouble stays the same then thats probably the problem..they should have been able to tell you what the code it said...was it calling out for? Some auto stores will lone this tool out as long as you hand them your drivers licence..but dont expect them all to do this.

Posted on Oct 04, 2009

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I have a 91 pontiac grand am with a 2.5 liter engine. My check engine light keeps coming on. The code says the problem is the egr circuit. My egr is vacumn actuated and has no eletrical connector. Where...


Take off erg valve and clean. Also take wire brush or used air compressor on its highest setting and blow out erg valve and egr housing areas

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I have the same problem with my ZX2. First you have to find out what engine you have to find out what emission control system you have. if you have a ERG valve clean it and your throttle body. Throttle body cleaner is under 10 bucks at autozone. If you don't have an ERG valve you might need a new idle air control it is 100 bucks at autozone and on the ztec engine it is bolted underneath the throttle body. you should also clean your mass air flow sensor which is located in your air cleaner right behind your air filter, after all of that check all your vacuum lines for leaks and if that does not fix it you might need a new PCV valve this one is pretty cheap about 5 dollars.

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Erg flow insufficient


  • The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (tube), most likely carbon buildup
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum
It is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • Replace the DPFE sensor (with a good quality / OEM one)
  • Replace the EGR valve
The EGR valve is located in the engine compartment. Its should look this

2_7_2012_10_25_48_pm.jpg

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Service engine light is on the code comes up erg insuficiant flow


That would be EGR. (Exhaust Gas Recirc). It is the diaphram valve that allows exhaust gases back into the intake to be reburned. Follow the small metal tube from your exhaust manifold(s) - they will lead to a flat, circular piece. that's the EGR valve. Some (not me) have had luck simply cleaning it - I always buy a new one. (not too expensive). But before you do that, make sure it's not just the vacuum line that is assigned to operate it. If that has a leak, it won't open either.

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The quick fix is to clean and reconnect all the electrical connector to the engine.

Pay close attention to the EGR lift sensor and the purge valve connector on the driver side fender.

I recommend CRC Mass Air Flow sensor cleaner (at major auto part store) or electrical parts cleaner (at Radio Shack).

After the cleaning then clear the code.

Fill up a full tank of Chevron to clean out the injectors.

====

If the same code returns then you will spend time on the EGR valve.

Carbon will built up over time and it will block the movement of the EGR valve and the EGR air passage.

Order a EGR base gasket before you start the job.

The easy route is to order a new EGR valve,but it can be clean if you have time. The air tube is a tough on. A vacuum clean can help to speed up the process.

After you put the valve and sensor then do a code reset.

This should fix you P1494 code problem.


Please post more information on the comment window,

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