Blanking EGR Valve on 4g64 GDI

2pennies, Apr 10, 8:00am
Hi there, I have read that blanking of the EGR Valve on 4g64 GDI with old outlet manifold gasket will solve some issues of inlet manifold getting coked up with carbon.
Any thoughts
intrade, Apr 10, 8:11am
yes but you have to know how it checks the egr function.
Like i got my egr blanked off on my electronic vw diesel
it would set a check engine light if it was not programmed out of the ecu engine managment. That is one version to not have it, with chip tuning.
A other option is to programm it to simply never open so it wont check if egr fumes are flowing or not when its comanded to not open up.
Now to the problem on direct injection its the same as on diesel
the problem is the crank case ventilation and wrong oils used along with to long oil change intervalls like 10,000km is the absolut maximum and even less if the vehicle is doing short trips.

This comes from bosch germany who make egr valves and sensors
the longlive service was used to sell more vehicles to big fleet owners who do loads of miles quickly and sell there vehicles off after a few years. Manufacturer are not interested you drive 1 car for 20 years+ They want to sell you a new car as soon as possible again.
evo_spares, Apr 10, 8:42am
This post is dangerous and is evidence intrade is not schooled up on GDi injection technology EGR removal on diesels and MPI whilst not always advantageous is possible reasonably safely, but trying to remove EGR on a an engine with 12:1 + compression ratio and layered injection at 40:1 AFR is downright stupid. Please report back with how many pistons you melt
mals69, Apr 10, 8:42am
I did it on my 92 terrano diesel but has not idled properly until well warmed up and then can idle to high after decent run - any ideas why ?
intrade, Apr 10, 8:58am
re 3 if you read i said you have to do it with chip tuning , officially removal of any emission related items is not permitted since a few years now its against The law , having said that what is not against the law breathing to fast will be against the law soon i would guess .
intrade, Apr 10, 9:05am
Diesel have egr flow only at idle and it closes at half load unlike petrol where egr is off at idle ,
if your diesel has No electronic pump then the only way the idle gets changed is by the actuator controlling the aircon.
it knows when egr should be on and changes idle with that divise , so you would need to remove that controll function so it dont starts to change idle .
So we will assume yours has been deleted befor this LAW was passed so techically your delet is not illegal .
evo_spares, Apr 10, 9:07am
You have no idea do you. Removing it by turning off the periphery bit or blocking it off is the easy bit. Replacing the melted pistons is the hard bit. I suggest doing some research on GDI injection technology and understanding the fundamentals of it, maybe then you will learn why the high EGR tolerance is a requirement
evo_spares, Apr 10, 9:10am
So much wrong!
evo_spares, Apr 10, 9:14am
Intrade spare a thought to the information you post online, as someone that claims to be a professional you are required to possess factually correct information. Im not sure that its been tested but potentially you could be liable for any damage as a result of incorrect information put out there by you
intrade, Apr 10, 9:25am
yawn. i got no time for this crap talk i wont bother to reply as when i would say you are right you would say i was wrong so yea well it wont happen.
mals69, Apr 10, 9:27am
Wow - never fails to amaze me how much you know intrade. Asked
others on here previously but nobody had a clue. had truck in at
mechanic this week and he said I would have to see a diesel specialist
about the idle.

Thanks a lot - much appreciated !
tweake, Apr 10, 9:34am
not many diesel run egr at idle. generally speaking off at idle and full throttle. but not all, some its on full time.

EGR is useful on petrol engines as it can help reduce throttling losses. they don't use anywhere near the amount of EGR diesels use (especially late model ones).
a.woodrow, Apr 10, 10:18am
Lol yep I'm sure someone can take you to court because of advice posted on a public MB. Maybe you could try being helpful rather than attacking others that have posted here for many years
2pennies, Apr 10, 10:45am
Why the argument, it was only a question about the blanking out the EGR on a petrol gdi engine.
Just wanted to know whether it would work or not. dont lose your rag over it
franc123, Apr 10, 10:50am
Lol he was helpful, given the level of EGR direct injection motors are designed to operate with and the other already discussed characteristics of GDI, tampering with it simply isn't advisable. The fundamental purpose of it is to reduce NoX emissions through lowering chamber temperatures, these higher temps being a side effect of lean burn technology. If someone attempting to repair these things doesn't understand that then I'd be buggered if I'd be letting them attempt to "fix" it thanks.
tweake, Apr 10, 11:10am
if you want to keep the inside of the manifold clean, fit water/alcohol injection system. i suspect this will also help with the valve issues those motors have,
aredwood, Apr 10, 12:04pm
Pretty sure the ECU also uses the EGR to control pinging / detonation on those engines. Meaning if you run low octane fuel = more EGR = blocked mainfolds. Therefore only run 98+ octane.
wind.turbine, Apr 10, 4:36pm
My 3.2 Triton is in at the moment getting its manifold cleaned out due to carbon build up.

Was so bad that they did not know how it was still running, mind you, it was surging a lot when pulling away at the bottom of hills
tweake, Mar 18, 5:54pm
i think thats the ones that known to be bad for it.

trouble with egr on diesels is the more egr the more smoke it makes and it goes up exponentially. and then it draws that in fouling the manifold, which restricts air flow and makes even more soot. so it doesn't take long for the build up to occur. all you need is some bad fuel, blocked air filter, blocked fuel filter, worn injectors etc to set the cycle off.