1986 EGR Removal??
Thread Starter
Burning Brakes
Joined: Oct 2010
Posts: 1,037
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From: Montclair New Jersey
1986 EGR Removal??
If I remove the EGR with a block off plate will I get a lot of codes?? What would be the benefits of removing the EGR?? Is it worth the trouble??
thanks for the info.....
thanks for the info.....
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
You'll get a code 32.
If you short the EGR sensor switch to ground you'll get a code 32 when you start the car because it's not supposed to be grounded at that time.
If you remove the EGR and/or EGR sensor switch you'll get a code 32 because the ECM expects to see the EGR sensor switch close when it commands the EGR to open.
I did see a way to avoid getting the code 32. Add a vacuum operated switch to the vacuum from the EGR solenoid. When the solenoid is energized it closes the switch and lies to the ECM, telling it that the EGR valve is open.
If you short the EGR sensor switch to ground you'll get a code 32 when you start the car because it's not supposed to be grounded at that time.
If you remove the EGR and/or EGR sensor switch you'll get a code 32 because the ECM expects to see the EGR sensor switch close when it commands the EGR to open.
I did see a way to avoid getting the code 32. Add a vacuum operated switch to the vacuum from the EGR solenoid. When the solenoid is energized it closes the switch and lies to the ECM, telling it that the EGR valve is open.
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Drifting
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From: Canandaigua New York
Safety Car
Joined: Apr 2011
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you have to understand the function of the EGR is a stock engine before thinking about burning valves, frying pistons, and/or knocking to death.
The EGR has no effect on power. It DOES prevent the engine from melting down when the high timing advance and lean EFI and high loads create a combustion temp that is too high for the aluminum to handle. It also keeps the lean exhaust from pumping out toxic oxides of nitrogen. When the 800 degree exhaust is used to cool the combustion chamber...you're process has gone way too hot and will destroy itself.
Sure, you CAN take EGR off and forget it safely, IF you get a retune that will retard timing, change air/fuel ratios and detune the stock motor slightly. We get to run hi advance on these engines with lean fuel because we have EGR to cool the over-heated combustion. Its does a lot of good and no harm at all. Worst case, it is something that can break and need fixing...thats all. It won;t even down the car when it fails. Its pretty benign.
Its bubba mythology that EGR is evil...
along with PCV........
EGR is the DEVIL
Safety Car
Joined: Aug 2009
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From: Melbourne, Victoria, Australia
Hi I get EGR codes when on the highway on cruise control, my EGR has been disabled for many years.
I will eventually modify the programming of the chip to ignore the egr status.
I will eventually modify the programming of the chip to ignore the egr status.
Safety Car
Joined: Aug 2009
Posts: 3,751
Likes: 276
From: Melbourne, Victoria, Australia
Ok i just saw that we may be on a different wavelength 
The air pump removal won't set a code. that is there to supply air to the cat to burn any unburnt fuel.
I was talking about the EGR valve on the inlet manifold, that recirculates/ pulses some exhaust gas into the inlet manifold via ecm control. Bypassing or disabling that will give you EGR codes.
The air pump removal won't set a code.
that is there to supply air to the cat to burn any unburnt fuel.I was talking about the EGR valve on the inlet manifold, that recirculates/ pulses some exhaust gas into the inlet manifold via ecm control. Bypassing or disabling that will give you EGR codes.
Last edited by gerardvg; Nov 4, 2011 at 03:15 AM.
Race Director
Joined: Apr 2002
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From: Anaheim CA
My EGR solenoid failed and stopped opening the EGR valve. The EGR valve froze up from not being exercised. The way I found out about this is that I would get a SES light on long cruises. The light would go out when I stopped and restarted but would come on again while cruising. I never got the SES light in around town driving, only on long cruises, like over an hour. I found a Code 32, which led me to the problem.
Heel & Toe
Joined: Jun 2010
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EGR will cause you to loose power. The EGR valve redirects hot exhaust gases back into the intake manifold. If it goes bad it will cause you engine to run hot, cause some knocking problems setting off your knock sensors, and drag down the engine. It is rocommended to replace every 15,000 miles. If blocked off than you must block off the vacumm hoses running to it. Since it has no electical wires running to it you will have no problems with codes going off. The engine will display a little more zip. Depending on the state you live in you may not pass an emission test. (Colorado would be one state)
Race Director
Joined: Apr 2002
Posts: 10,036
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From: Anaheim CA
The EGR valve is controlled by the ECM. There is a solenoid mounted on the thermostat housing that feeds ported vacuum from the throttle body to the EGR valve.
The ECM can tell that the EGR valve is not working by the EGR temperature switch, which is mounted on the exhaust gas feed pipe that connects the exhaust manifold to the EGR passages in the intake manifold.
The ECM can tell that the EGR valve is not working by the EGR temperature switch, which is mounted on the exhaust gas feed pipe that connects the exhaust manifold to the EGR passages in the intake manifold.
