NO NO NO NO!!!!

Don't disconnect the MAF sensor! It's a vital component for the fuelling quantity etc! Forget it. I see plenty of cars with buggered/contiminated MAF sensors and they suffer from POOR performance!

The EGR valve makes an annoying metallic clatter noise sometimes; I have to demontrate to customers it is nothing to worry about and send them out on a short road-test with it diconnected to demonstrate (a)That it is nothing to do with the 'tappets' they all seem to think it is and (b)I'm not a lying sod!

Sometimes, pulling the vacuum hose enables an easier MOT smoke test pass, but it's not often required.
If you look at the engine, you have a large acoustic cover on top....follow this to the back edge and peek underneath the back edge - you should see a bright capsule with a small bore black vacuum hoses going to it's centre. That's the EGR actuator - the valve is underneath it.

I wouldn't bother playing around with it.

 

Hell I'm good to you peeps......here's a pic showing the general area of the EGR valve

 

thanks for the info

Reason I asked about the EGR valve was that I have a bit of a flat spot at low revs and it sounds like the EGR is operating

was going to disconnect the EGR to see what difference it made

still not to sure what the egr valve looks like so I've attached a pic of what I think you mean (probably something totally different)

I've also indicated both ends of the hose you would normally plug the top end??

 

In my experience id disconnect the damn thing, mines smeged it was causeing lots of smoke when i was cruising at a steady speed.

Disconnect it while the engines running and you might even hear the engines sigh of relief ,disconnect the WIRING CONNECTOR not the hoses just leave them alone.

The engine will run perfectly well without it mate.

 

The old 200 engine bay looks a lot different to my ZR TD...

The fuel filter, and ecu etc. are all in different places....

 

In my experience id disconnect the damn thing, mines smeged it was causeing lots of smoke when i was cruising at a steady speed.

Disconnect it while the engines running and you might even hear the engines sigh of relief ,disconnect the WIRING CONNECTOR not the hoses just leave them alone.

The engine will run perfectly well without it mate.

thanks for the info

where is the wiring connector, is it shown in the picture??

 

See in the pic above, see the little plug on the EGR solenoid (the thing with 2 vacuum hoses goin into it) with 2 wires comim out of it?

The wires are colour coded brown/orange and red/grey.

In my experience the car picks up a lot better with this thing disconnected but leave the vacuum hoses in place, infact remove them and make sure there not blocked and reconnect them.

Let me know how you got on.

 

Yeah, disconnecting the valve electronically will have the desired effect but be careful about doing this on late cars, as it will cause the MIL to come on!

 

thanks for the info guys

I unplugged it last night and did notice quite a difference, more than I thought I would but this could be because the engines tuned.

I think the EGR valve might have been causing the problem with the first tuning box, as the car would shake when idling after a cold start, maybe the EGR was coming on when it shouldn't??

 

"it will cause the MIL to come on!"

What is the Mil?

Could someone
put a pic of what
is required to disconnect de EGR ?

thanks

 

Malfunction Indicator Light.. The "Check Engine" light, basically

Brian.

 

Which tells you (the driver) that something is wrong with the engine that could cause an increase in tailpipe emissions.

If you pull the wire from say, the purge valve on a new car, the MIL will soon come on....

I think the same would happen on a modern Diesel, too. That's where the ball bearing trick comes in!

 

BEWARE

The EGR valve is fitted as an emmisions control
measure. Its purpose is to reduce the output of
NOX gases from the exhaust. It achieves this by
recycling roughly 10% of the exhaust gas output back through into the inlet manifold.
More critically this has the effect of weakening
the fuel mixture (less oxygen, less NOX) and thus reducing the temperature in the cylinders and in turn of the exhaust valves and manifold.
This should increase the reliability and longevity of your L-series engine.
Therefore havind the EGR valve disconnected for a
long period of time may have a detrimental effect
on your engines long term health because of the
increase in the combustion temperatures

 

whatcha think of putting 10% nitrous through the EGR instead of exhaust gases :naughty: might need to change the operation of the valve though

I'm not serious btw

 

whatcha think of putting 10% nitrous through the EGR instead of exhaust gases :naughty: might need to change the operation of the valve though

I'm not serious btw

Not a bad idea........who's gonna try it? :lol:

Good point, Nightfire......cracked heads etc

 

JonathanP

hmm
i think that will increase a lot
the NOX exausts

u will kill all fauna in the sorroudings

 

I dont think I'd ever use nitrous on an l-series unless the engine had been seriously strengthened and there was nothing else left to do

 

i have read the following post, but i am still unsure how to disconnect the valve. Can anybody help??? how long should i run the car for with out the valve connected

 

I unplugged the connector indicated with the red arrow and the 2 wires coming out, if you wanna unplug the vacuum hose and plug it with something like a ball bearing like dr dave said I think its the one indicated with the yellow arrow

I think your supposed to plug the end furthest away from the connector, it's probably better to do this than unplug the connector as it shouldn't log a fault code

as for how long you should run it like this I dunno, depends how hard you drive the car, the harder you drive it the more it could stress your engine