Question about 2005 Chrysler Pacifica

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I replaced the EGR valve and with the car in park, the engine hesitates continuously when the engine is revved. When I rev the engine when it gets to 3000 rpm's it hesitates. The rpm's won't go any higher

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Mass air flow sensor ?? sounds like it

Posted on Oct 24, 2010

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Real up and reving in park fast idle in drive


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Hesitation on acceleration


Can be egr valve, enginge usually shakes back and forth like a huge miss most times. I would definatly check in this order: fuel filter, fuel pump. Sometimes the pump may run, but be too weak to run an engine at speed or under load. If you replace the filter and pump, and it still don't help, then at least you know for sure its not the pump or filter, and move on to the egr, vacuum leaks, etc. Sometimes its a "search till you find it" type thing.

Dec 16, 2013 | 1996 Cadillac DeVille

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Check engine light still on after replacing egr valve and spark plugs and 3 ignition coils under manifold. Car was diagnosed with solenoid pack leak previously and that has not been fixed yet. Is this the...


Have it scanned for the faults that are stored and follow the proper test procedure for each fault,it will reveal the cause then the right repair will be made.

Oct 01, 2013 | 2004 Chrysler Pacifica

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Check engine light on auto zone read codeP0404 replaced egr valve,air filter, added sea foam, and high octane booster. car still has check engine light on reading same code will not accelerate hesitates if...


When it revs high, is it down shifting? if so you may be running out of gas. low fuel pressure or lack of fuel getting to the injectors. (fuel filter)

May 02, 2010 | 2002 Chevrolet Impala

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How to clean/check the egr valve


When the EGR VALVE is clogged or malfunctioning, it can cause irregularities in engine performance such as rough idling or valve knock, indicating that the EGR valve should be inspected.
The EGR valve works by routing a small amount of exhaust back into the combustion chamber. When the temperature in the combustion chamber is too high, nitrogen oxides are produced, which combine with elements in the atmosphere to form smog. Introducing a small amount of exhaust into the system reduces the temperature in the combustion chamber, reducing the amount of nitrogen oxides produced.

Many EGR valves are mechanical, and simply have a small valve which opens to allow exhaust into the combustion chamber and closes when it is not necessary, and to keep the air mixture optimal for combustion. Some mechanical versions will not open until there is sufficient back pressure, ensuring that the valve will not be open when the engine is idle or warming up and needs a higher concentration of oxigen for combustion. Electronic EGR valves are also available, and use electronics to regulate the valve.

If the EGR valve is stuck open, it will essentially cause a vacuum leak, leading to inefficient combustion, rough idling, hesitation, and sometimes stalling in extreme cases. This is because the car cannot combust on carbon dioxide from the tailpipe — it needs atmospheric oxygen. If the combustion chamber is flooded with exhaust from an open EGR valve, it will not function properly. To check and see if the EGR valve is stuck open, have someone idle a parked vehicle with the brake on while you examine the plunger shaft to see if it is stuck open.
If the EGR valve is stuck closed, emissions of nitrogen oxides will rise, and the car may start to knock. Spark knock happens when the fuel mixture in the combustion chamber ignites before it has been reached by the explosion in the cylinder, resulting in a disruption of the engine timing. In this instance, the engine should be warmed up and revved to see if the EGR valve will move.

In both cases, simple repairs are possible. The EGR valve can be clogged, and a simple cleaning of a mechanical EGR valve may solve the problem. In the case of an electrically controlled EGR valve or a more complex mechanical problem, replacement of the valve may be needed. The EGR valve is an expensive motor vehicle component, and care should be taken to ensure that it needs to be replaced rather than repaired. A reputable mechanic should advise you appropriately.

Failure to repair or replace the EGR valve will not lead to a life threatening condition, although it will reduce the life of your car and increase the potential emissions. Especially in areas which require smog testing, an automobile with a malfunctioning EGR valve may not pass

HERE can find one video about this subject.

Hope help with this (remember rated this help) Good luck.

Mar 18, 2010 | 2007 Mitsubishi Galant SE Sedan

1 Answer

Can egr cause the car not to start


It could cause it not to start if it's stuck open.

If the EGR valve is stuck open, it will essentially cause a vacuum leak, leading to inefficient combustion, rough idling, hesitation, and sometimes stalling in extreme cases. This is because the car cannot combust on carbon dioxide from the tailpipe — it needs atmospheric oxygen. If the combustion chamber is flooded with exhaust from an open EGR valve, it will not function properly. To check and see if the EGR valve is stuck open, have someone idle a parked vehicle with the brake on while you examine the plunger shaft to see if it is stuck open
.
If the EGR valve is stuck closed, emissions of nitrogen oxides will rise, and the car may start to knock. Spark knock happens when the fuel mixture in the combustion chamber ignites before it has been reached by the explosion in the cylinder, resulting in a disruption of the engine timing. In this instance, the engine should be warmed up and revved to see if the EGR valve will move.

Jan 15, 2010 | 2003 Chevrolet Impala

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2006 dodge grand caravan does it have a engine rev limiter?


these vehicles are equipped with a rev limiter..normal operating condition

Sep 13, 2009 | 2006 Dodge Caravan

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1999 Lincoln Continental 4.6 32v engine...idles smooth in park & in gear. In park I get a engine miss when revved to 4000rpm. Also seem/feels like I have a miss at lower engine speed when being driven....


hello, i first must ask why that engine would EVER be reved to 4000 RPM? it is likely you are up against the rev-limiter and your ignition is made not to over rev. be very careful....4000 RPM on that engine could/will severly damage your tourque convertor........very expensive it is common for the EGR passages on that model to plug up with carbon, remove valve, clean ports, and retest for low speed miss/hesitation, good luck....marty

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if the check engine light is on it probably the egr valve but if the light is not on the idle control solinoid is dirty or broken

Dec 01, 2008 | 1997 Honda Civic

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