Would a sticking EGR make the car hard to start?

[Daytona]

1.9 JTD 2004 156

Sometimes needs lots of goes before finally catching and starting. Once started it goes fine, although it does seem a bit more smoky when revving hard.

cheers

[Shadeyman]

A stuck EGR wouldn't prevent the car starting. However it may cause smoke and a loss of power once the car has started.

[rorystorm]

I found my 1.9 jtd extremely hard to start with a stuck EGR, the only way to keepit running was to rev the ******** off it!

[Shadeyman]

A stuck EGR doesn't effect a cars ability to start, you had other issues if the car struggled to start.

[jim hazell]

Glowplug relay? a common weak point.

[ALFA TUNER]

Originally Posted by Shadeyman

A stuck EGR doesn't effect a cars ability to start, you had other issues if the car struggled to start.

You are sooo wrong,with a stuck open EGR,some models will not even attempt to fire.

[Shadeyman]

Originally Posted by ALFA TUNER

You are sooo wrong,with a stuck open EGR,some models will not even attempt to fire.

Would you care to enlighten us as to why you think "SOME" cars wont even fire?

[JON156VELOCE]

I had this problem on a mates car after he'd cleaned the egr valve, the car was trying to start but just wouldnt catch, we took the egr valve back off and the round poppet valve wasnt quite seated properly, took the solenoid back off so it could close, refitted and the car started straight away.

Car was an Astra but with the z19dth diesel engine.

[rorystorm]

Originally Posted by Shadeyman

Would you care to enlighten us as to why you think "SOME" cars wont even fire?

If the valve is stuck open a lot of the air meant to go into the pistons is lost down the exhaust, I suppose it depends on how open it is when stuck/jammed.Hence some cars start, others don't.

[Shadeyman]

The inlet manifold is at normal atmospheric pressure until the engine is started, then the pressure drops as the engine sucks in air and exhaust gases through the EGR. Even with the EGR fully open there isn't enough exhaust gases passing through it to cause a diesel engine not to start so if the engine does fail to start there are other underling issues that need solving. This may not be true of a petrol engined cars as the fuel air mix is more critical but if the car has no other issues it should still start but will run rough ...

[Spider95]

I found cleaning the MAP sensor helped starting from cold. Could be completely wrong, but that's how I find it anyway - and a lot smoother delivery through the rev range as well.

[hdseven]

Originally Posted by rorystorm

If the valve is stuck open a lot of the air meant to go into the pistons is lost down the exhaust, I suppose it depends on how open it is when stuck/jammed.Hence some cars start, others don't.

so so wrong.......the egr valve feeds dirty exhaust gas into the inlet manifold when car is cruising or doesnt need power.......it does not let air go into the exhaust

[hdseven]

Originally Posted by Shadeyman

The inlet manifold is at normal atmospheric pressure until the engine is started, then the pressure drops as the engine sucks in air and exhaust gases through the EGR. Even with the EGR fully open there isn't enough exhaust gases passing through it to cause a diesel engine not to start so if the engine does fail to start there are other underling issues that need solving. This may not be true of a petrol engined cars as the fuel air mix is more critical but if the car has no other issues it should still start but will run rough ...

ecu controls the egr not air pressure.....egr only opens when the car is capable of burning gas and not affect power......like cruising or going down hill.......as soon as u demand throttle the ecu shut egr and let is have all the nice cold clean air from intercooler

re earlier comment by alfatuner.....it could be so on cars with a dpf filter, im not familier with them.....if ecu senses erg valve open its quite possible it could bugger up the dpf??

[rorystorm]

Originally Posted by hdseven

so so wrong.......the egr valve feeds dirty exhaust gas into the inlet manifold when car is cruising or doesnt need power.......it does not let air go into the exhaust

so if it lets exhaust gasses into the manifold normally, when it's jammed open what happens......surely the manifold mixture goes down the exhaust, otherwise why bother closing it off!!!!!!!! Of course I may be so, so wrong!

[jim hazell]

Maybe the easiest way of checking is a coke tin and a pair of scissors. No i dont mean drink a can of coke and stab yourself.Cut the tin to make a temporary blanking plate for the egr valve and see if it helps, ive known an 06 Audi not start with a faulty egr valve but im not sure if it upsets the engine ecu causing it not to start rather than the egr valve itself.

[rorystorm]

Jim, I did a slightly more robust blanking plate and it ran fine for 25+K miles until sold recently. Performance if anything was better than before, though the EGR may have been iffy for a while.....eliminated a distinct hesitation when accelerating. Did give a permanent Go to Dealer oninfocentre tho. Did pass MOT no problem, tho I'm told as of April/May this year it would fail an MOT due to infocentre warning......bloody beaurocracy!!!

[hdseven]

Originally Posted by rorystorm

so if it lets exhaust gasses into the manifold normally, when it's jammed open what happens......surely the manifold mixture goes down the exhaust, otherwise why bother closing it off!!!!!!!! Of course I may be so, so wrong!

When it's jammed open it lets exhaust in all the time.

[Back2Alfa]

My experience (sorted last night and has, so far, started first time every time): EGR off - pretty clean - split and put back together - removed EGR blanking plate (previous owner's doing, not mine) - worked a treat.

Don't know if it was the superficial clean, reseating the pin or removal of blanking plate but working a treat now.

[dispsinho]

I remember my EGR valve going and I'd just come off the motorway and lost complete power - it was sticking as it recovered on its own - got it replaced though rather than cleaning it as I was told cleaning it may only temporarily fix the issue.