Any problems with EGR delete? (due to hotter combustion)

[Chuck61686]

I have an EGR block-off plate on my car and somebody (a mechanic) told me that not having the EGR leads to much hotter combustion temps. Do hotter combustion temps put more wear on vital components such as valve stem seals and piston rings? I can live with the negligibly lower MPG, but I just hope I'm not putting any excessive wear on the engine...

[DaleR]

Well my JDM model didnt have an EGR system from new, and the JDM models are fine.

[archangelcomp]

Its not gonna lower your mpg, its not gonna cause anything bad. All it is...is a useless system created to keep people in their executive leather chairs happy that dont know anything about cars.

Just TRY to tell me otherwise

[smokinvr-4]

I can't see why you would have any hotter combustion without an EGR, infact it should be cooler without it. Think about it, its introducing hot exhaust gases back in the intake path.

it also contributes to more carbon buildup on your valves(with an EGR)

IMO it does more harm that good, without an egr I still had no problems passing emissions
(it also helps they had no idea where the EGR should be on my car, lol)

[PezCore]

it also contributes to more carbon buildup on your valves.

with it still there, to be clear

[Fijiblue92vr4]

i know this is a real old post but...i was reading on stealth316 about having the egr system removed it more likely to have detonation has anyone had any problems like that with the delete?? this is what it says on stealth316

2. Check for loss of EGR. The Exhaust Gas Recirculation (EGR) system is one of the engine's primary emission controls. Its purpose is to reduce oxides of nitrogen (NOX) pollution in the exhaust. It does this by "leaking" (recirculating) small amounts of exhaust into the intake manifold through the EGR valve. Though the gases are hot, they actually have a cooling effect on combustion temperatures by diluting the air/fuel mixture slightly. Lowering the combustion temperature reduces the formation of NOX as well as the octane requirements of the engine.
If the EGR valve is not opening, either because the valve itself is defective or because its vacuum supply is blocked (loose, plugged or misrouted vacuum hose connections, or a defective vacuum control valve or solenoid), the cooling effect is lost. The result will be higher combustion temperatures under load and an increased chance of detonation.


Refer to a service manual for the configuration and hose routing of your engine's EGR system, and the recommended procedure for checking the operation of the EGR system.

[jba3]

Originally Posted by Fijiblue92vr4

i know this is a real old post but...i was reading on stealth316 about having the egr system removed it more likely to have detonation has anyone had any problems like that with the delete?? this is what it says on stealth316

2. Check for loss of EGR. The Exhaust Gas Recirculation (EGR) system is one of the engine's primary emission controls. Its purpose is to reduce oxides of nitrogen (NOX) pollution in the exhaust. It does this by "leaking" (recirculating) small amounts of exhaust into the intake manifold through the EGR valve. Though the gases are hot, they actually have a cooling effect on combustion temperatures by diluting the air/fuel mixture slightly. Lowering the combustion temperature reduces the formation of NOX as well as the octane requirements of the engine.
If the EGR valve is not opening, either because the valve itself is defective or because its vacuum supply is blocked (loose, plugged or misrouted vacuum hose connections, or a defective vacuum control valve or solenoid), the cooling effect is lost. The result will be higher combustion temperatures under load and an increased chance of detonation.


Refer to a service manual for the configuration and hose routing of your engine's EGR system, and the recommended procedure for checking the operation of the EGR system.

Great catch ... I'm looking into the EGR block off plates from SCE and would love to know if it's true too!

[bigred3kgt]

Fijiblue92vr4 ... Could you supply a link in stealth316? Can't seem to find it. I did find his [stealth316] technical resources page Stealth 316 - Technical Information Just tons of stuff there. An article in that listing Understanding Exhaust Gas Recirculation Systems by Henry Guzman is a good read about EGR's in general. It states that EGR systems are intended/designed to reduce the potential for engine detonation but doesn't really answer whether or not detonation will start happening without it. As I'm curious myself ... I'm just tyring to add info.