EGR Blanking, is it recommended or not.

[oj88]

I noticed it was at 0% even at idle ..... Anyway i'll check it again. Don't like keeping the obd2 device connected always as it seems to heat up. And as i know the egr should be open at idle speeds and closes at higher revs.

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It's usually closed at idle. In fact, one symptom of a stuck-open EGR valve is rough idling.

It only opens up under certain conditions (varies widely among different vehicles). But it should definitely be closed during idle and WOT.

[aar0nix]

It's usually closed at idle. In fact, one symptom of a stuck-open EGR valve is rough idling.

It only opens up under certain conditions (varies widely among different vehicles). But it should definitely be closed during idle and WOT.

Sir please let me correct this.

The EGR Valve is always open at varying degrees except during WOT.

It is usually at 26-30% open during idle at 25-32°C intake air temp (IAT), 35-40% open at 35°C+ IAT. 0% open at WOT. 40-50% open when cruising at 80km/h

Before I had my EGR blanked, I experienced puffs of black smoke whenever I floor the accelerator of my mux (12/2014, 2.5 4jk1-tc model) after idling or being stuck in daily traffic. After blanking, no more black smoke during the same conditions.

I had it blanked with a slotted (10mm hole) 3mm stainless plate and this is what I get now: EGR always at 100% open, turns closed whenever I step on the accelerator, even light stepping. Then turns back to 100% open gradually. 0% when cruising.

Attached is a graph using torque pro with bafx obd2 scanner. Shows how the egr operates after blanking. I'd rather have this than puff black smoke all the time whenever I'm done braving Manila traffic. ;)

[oj88]

Sir please let me correct this.

The EGR Valve is always open at varying degrees except during WOT.

It is usually at 26-30% open during idle at 25-32°C intake air temp (IAT), 35-40% open at 35°C+ IAT. 0% open at WOT. 40-50% open when cruising at 80km/h

Before I had my EGR blanked, I experienced puffs of black smoke whenever I floor the accelerator of my mux (12/2014, 2.5 4jk1-tc model) after idling or being stuck in daily traffic. After blanking, no more black smoke during the same conditions.

I had it blanked with a slotted (10mm hole) 3mm stainless plate and this is what I get now: EGR always at 100% open, turns closed whenever I step on the accelerator, even light stepping. Then turns back to 100% open gradually. 0% when cruising.

Attached is a graph using torque pro with bafx obd2 scanner. Shows how the egr operates after blanking. I'd rather have this than puff black smoke all the time whenever I'm done braving Manila traffic. ;)

There may be exceptions to the rule but I can't imagine having the EGR cracked open during idle. In almost any documentation I've read, having the EGR valve open, even slightly during idle, will cause rough idling or cause the engine to stall. (P41 – Exhaust gas recirculation (EGR) system -insufficient flow detected – OBD2 Trouble Codes)

Your EGR mapping is weird. Either we're not interpreting it correctly or it's not operating in a traditional way.

But I agree with you, with that kind of mapping, you will definitely see black soot coming out the tail pipe if you didn't blank it.

Other references:
AGCO Automotive Repair Service - Baton Rouge, LA - Detailed Auto Topics - How Does an EGR Valve Work
Exhaust gas recirculation - Wikipedia, the free encyclopedia




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[aar0nix]

There may be exceptions to the rule but I can't imagine having the EGR cracked open during idle. In almost any documentation I've read, having the EGR valve open, even slightly during idle, will cause rough idling or cause the engine to stall. (P41 – Exhaust gas recirculation (EGR) system -insufficient flow detected – OBD2 Trouble Codes)

Your EGR mapping is weird. Either we're not interpreting it correctly or it's not operating in a traditional way.

But I agree with you, with that kind of mapping, you will definitely see black soot coming out the tail pipe if you didn't blank it.

Other references:
AGCO Automotive Repair Service - Baton Rouge, LA - Detailed Auto Topics - How Does an EGR Valve Work
Exhaust gas recirculation - Wikipedia, the free encyclopedia




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You are talking about an EGR system installed in a gasoline engine.

It operates differently with diesel engines. Only off at WOT. Always partially open at idle and partial throttle.

I will record a similar graph on a non-egr blanked Isuzu MUX and post it here.

[Tediber Ang]

Thanks .... Mine seems always at 0% no matter what i do.

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[oj88]

Thanks .... Mine seems always at 0% no matter what i do.

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I'm guessing your OBD2 is either not picking up the correct sensor value or your vehicle has an all-mechanical EGR valve and the computer is not controlling it.

Also note that the 0% reading your reader is showing is the 'commanded' value requested by the computer to the EGR valve.

[roydok]

Why You Should NOT Remove Your EGR Valve! - YouTube

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[oj88]

To me, the decision was simple; Blank it and I'd be producing slightly higher NOx but less soot or particulate matter (PM). Leave the EGR alone and NOx will be marginally lower. However, PM will be higher. Aside from that, PM also gets to contaminate the engine's intake, the oil, reducing the EGR's efficiency and producing even more PM. Excessive exhaust gasses from stuck EGR valves also lowers the engine's efficiency and increases fuel consumption.

Not saying I'm wiser than the engineers who,designed it but, even they (manufacturers) think that the EGR approach doesn't significantly reduce NOx. SCR/DEF I believe, is the better choice.

[roydok]

Just use standard Euro 4 or if available in your area Euro 5 fuels to reduce PM. I have a 2010 Montero Sport diesel which used standard Euro 4 diesel from 2011 to 2016. EGR was not that dirty/blocked upon opening in 2016. No prior EGR cleaning done since 2010.

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[minicarph]

eto eGR blanking should be subjected to the Golden Rule: Do Unto Others ... coz mag EGR blanking ka para makatipid sa diesel (which is btw matipid na naman diesel to begin with) in exchange for not caring for the environment, siguro ang balik na lang neto sa pamilya mo magkarun ng lung dieseases sa future.

what goes around comes around I guess. so bale natipid mo sa sasakyan, uubusin mo din sa ospital later on in life. parang yun nangyayari sa mga BIR employees nuon araw, garapal sa kotong sa businesses, tapos mapansin matitinde din ang sakit na dumadapo sa pamilya nila

parang yun mga bumibile ng sobra lakas na HIDs sa cars nila, malamang madali lalabo mata nila later in life coz of the Golden rule