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Posted

Not always about someone who boots the car. I tow a caravan (yes, one of those that blocks your favourite road on a sunny day!) and will put the engine under load at times. Part of the regulating system of the EGR allows cooler gas flow.

 

Don't know about where all the temp sensors are on a Citroen, but I doubt its in the combustion chamber which is where the excessive heat is.

 

Usually all dials show the various temperatures being fine, yet the combustion chamber is exposed to too much, giving a possibility, I stress, possibility, of cracking the block or head. It is an extreme case where this can happen, but do you really want to risk it for the sake of a new or reconditioned EGR.

 

The EGRs I have seen have been a crude diaphragm and valve where the diaphragm gets perforated or the valve sticks.

 

Regarding my comments / question on the ELM, this is nothing to do with what I was posting about the EGR! I have no idea if a scanner / reader is able to diagnose the EGR as I cannot get the interface working as yet and is posted elsewhere anyway!!

 

Please note that this post was to simply warn anyone thinking of bypassing / blocking / etc of the EGR to be aware of the remote possibility of trouble. Known cases attributable to a mod of the EGR have been very rare.

Guest Dervman
Posted

Well I blocked off the EGR solenoid, as per a previous thread. The car 'seemed' crisper, certainly pulled a lot better in 1st (didn't bog down like it normally does). And certainly scared the hell out of a guy in his Volvo C30 2.0d, when I'm still on his tail at very naughty speeds... Ran for 2 days like this, and then got the anti-pollution fault warning!

 

Refitted the EGR pipes (unblocked and pushed plastic back into rubber)! Drove another day, and the warning went away!

 

Think I'll leave it connected and get it chipped instead ;)

 

Anyone got experience of the pressure override boxes people are selling on ebay for £100? From what I can work out, they're just overriding the sensors to the common rail - or is it more clever than that?

 

Currently with the 'crunch' I can't afford the £500 for a proper remap, wondered how these work - deliver power in one lump, or is it progressive?

 

TIA,

 

Derv...

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