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Can an automobile be run with the EGR valve blocked off

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Leave your EGR valve system blocked off (and it will ruin that part of your Catalytic converter). If you straight pipe it without the valve then your car will most likely not run at all and if it does it will be really bad.

Running water into the EGR system will either put water into your Intake Manifold or your Exhaust system...wich one would you rather ruin.

But if you leave it off you could be causing knocking and pinging due to pre-ignition during light load conditions and that Does damage your engine in the long run.

Posted on Apr 19, 2014


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Posted on Jan 02, 2017


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EGR how to fix

<p><b><span>1.6c) EGR errors and how to fix</span></b><br /> <p><b><span>How to check?</span></b><span><span> </span>With the engine running it may be possible to force the EGR valve open by pressing on the diaphragm on the underside with one's fingers.<span> </span>Alternatively, disconnecting the vacuum line to the EGR and applying a vacuum to it (even sucking on it with your mouth) will determine if the diaphragm is split.<span> </span>If the valve opens in response to vacuum check that the upstream <b>vacuum control valve</b> on the vacuum line is opening in response to ECU instruction.<span> </span>Disconnecting an electrical EGR and applying a switching voltage (9 volts) across the connecting pins will cause it to open and the idling engine should falter or stall as the pressure drops in the intake manifold.<span> </span>If the unit clicks open but the engine is oblivious to its effect then it is likely that the passageways to the EGR are clogged up.<span> </span>Removal of the EGR assembly and examination of the ports and valve mechanism will reveal any carbon build up.</span><br /> <p><span> </span><br /> <p><b><span>How to fix? </span></b><span>Determinefirst that the fault actually lies with the EGR and not with any ancillary solenoid used to block vacuum to the EGR or a faulty DPFE sensor (see below). If the diaphragm is split then the EGR needs to be replaced<b>.<span> </span></b>Most EGR problems are linked to carbon soot build up and this can be cleaned using a cloth, metal pick, wire brush and carburetor choke cleaner spray.<span> </span>If the exhaust feeder pipe is blocked this can be cleaned using a piece of coat hanger wire or a piece of frayed hand brake cable fitted to a drill as a rotary brush <span>to remove dirt from the interior, even around corners.<span> </span>Some cars, Hondas are a good example, have an elaborate passage-way system to provide EGR exhaust gas to each individual inlet pipe runner.<span> </span>Later, Honda, having become aware of the occasional need to remedy blockages, provided EGR passageway assemblies with removable lid sections to allow cleaning access.</span></span><br /> <p><span><span><br /></span></span><br /> <p><span><span><b>NEXT 1.7) DFPE Differential Feedback Pressure Exhaust sensor</b></span></span><br />

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

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Will a car run with the EGR valve blocked off

Yes it can run with it blocked off the only issue of concern is if the engine pings (rattles) under load this causes piston skirt damage or just burns a hole through the top of the piston.

Apr 19, 2014 | Cars & Trucks

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EGR Valve keeps blowing out and no power

EGR valve blow-out can be caused by a clogged catalytic converter. A clogged cat. converter will cause pressure to back up in the engine. A test to perform is remove the front oxygen sensor from the exhaust to see if the engine runs better. Removing the oxygen sensor will relieve the pressure if, in fact the cat. converter is clogged. Another cause for EGR blow-out could be that the timing has jumped.The timing can be checked to diagnose this issue.

Mar 28, 2014 | 2003 Mazda Tribute

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How do I replace egr valve in 2001 ford tauras

Before I attempt to explain replacing the EGR let me suggest strongly you take it to a professional. The problem for the DIY on this project is the EGR is exhaust - this means a lot of the time you need fire - to release the threads on the old piece. The EGR is very high heat because it carried exhaust. This tends to rust because of the moisture in the exhaust gasses. Please consider the cost of a set of torches or even the cost of replacing the surrounding units that many times will bend - break or leak.
If you really want to go ahead with it - here is some Video on it.

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Gary @ Fix Ya

Gary @ Fix Ya

Dec 09, 2012 | Cars & Trucks

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I had a diagnostics test don't on my 1997 Chevy Lumina. It showed several problem 1) Blocked passage on EGR system, Failed EGR valve, EGR solenoid faulty, Failed EGR pressure sensor where applicable...

All that Failed EGR valve, EGR solenoid faulty, Failed EGR pressure sensor and failed EGR vposition sensor may be telling you that is the EGR valve is faulty and not that it is loaded up with carbon. But I know you don't want to hear that as that EGR cost more than a can of carb clean and I don't blame ya!

If yoy have a multi meter, check out, go to the GM section for your motor, chose test EGR and there should be an explanation on how to run some test on your EGR before you buy a new one.

Sep 04, 2011 | 1997 Chevrolet Lumina

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Egr valve clogged - will not idle correctly - possible vacuam leak

take EGR valve off and make a full gasket with a coca cola can so it blocks the valve off completely this will eliminate any problems ,did cars years ago have this valve?? no they didnt just block it off and it will run like a dream

Feb 21, 2011 | 1994 GMC Suburban

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Egr trouble light

The EGR Valve and System - it's just three letters, but EGR can result in AGGravation.

Common in automobile emission systems since the early 1970s, the EGR (Exhaust Gas Recirculation) valve controls an engine's emission of smog-causing nitrous oxides, or NOx. Its job is to route a portion of the exhaust gases back into the intake manifold. That lowers combustion temperature to below 2,500 degrees Fahrenheit - the temperature at which NOx gases form.

EGR flow is controlled by the engine's computer, which opens or closes the valve as needed. The EGR system is, for the most part, in the "out of sight, out of mind" category, and typical doesn't require regular maintenance. But if it gets clogged with carbon deposits, you'll see your "check engine" light come on, and a code (perhaps P0401 or P0402 or P0403) will show that there is insufficient flow. That typically results from a vehicle being driven persistently on short trips that don't allow the engine to fully warm up. Flow problems also can be caused by carbon buildup due to failure to change the oil frequently enough.

A clogged EGR valve not only results in higher emissions, it can affect fuel economy and cause rough idling - even serious engine damage. Valves can usually be cleaned, but replacement is often recommended.

A code P0401 most likely means one or more of the following has happened:
* 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

Possible Solutions: In fixing this code, 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

Jan 11, 2011 | 1999 Isuzu Trooper

2 Answers

Code p0400 keeps coming up after changing the egr valve and sol.

It may be that the passage to the exhaust is blocked also.

Aug 14, 2009 | 1996 Nissan Sentra

2 Answers

I have a 1986 jeep comanche it either idles high or doesnt want to run where do i begin?

A part called an idle air control valve. It should be near the throtle linkage. But one from a parts store, change it out and see what that does.

Jul 18, 2008 | Jeep Comanche Cars & Trucks

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