cut out / stall problem

[magoo]

Advice /help required please.


I have the B9 1.6 XTR. 75K on the clock, full service every year.


The following is a frequent but possibly intermittent problem, on a drive it could happen several times or just once. This could be me as I have had to adapt my driving.

For last the last 6 months a problem has developed concerning the engine wanting to stall/cutout when manoeuvring to get out of drive way, pulling away at a give way line or even when half way across the road (  a bit dangerous)


If at a standstill you can hear/feel the unresponsiveness if pressing the accelerator gently and if go straight from idle to plenty of revs there is a slight lag (not the right word) and it will wither go to full revs or cut out.

I have to blip the accelerator and give plenty of revs to make sure it doesn’t stall/cutout.

Runs perfectly when going but the torque seems less powerful when on a hill.

The garage (a good indy) has put it through their computer but no codes coming up. And checked the basics and all ok.

Passed all tests for MOT (yesterday).

They say it could be many faults or one, so don’t want to waste my money just gambling on when the solution pops up.

He wondered whether it could be the EGR but nothing definitive is showing.

Might take it to Citroen for a diagnostic then let the indy do the work if anything shows up.

Once in a blue moon the engine management warning comes on when starting, I turn of and it is usually ok, never comes on when driving.

It’s a hard one to describe.

Thanks

[bikey]

Not sure if yours is a diesel so this might not apply, but I had a similar problem for some time and sort of got used to it. Then just a couple of weeks ago I noticed there was a small area of chafing on the vacuum pipe from the vacuum pump. Managed to trim the pipe back past the damage and refitted it. The engine runs a lot smoother now on small throttle openings. I also noticed the brakes were working better. I couldn't see any perforation of the pipe but I think the chafing might have weakened it allowing it to partially collapse under vacuum.

[bikey]

Also, my engine management light used to come on at random, now seems ok so far. :-)

[cancunia]

Does your Indy garage use Citroen Diagbox diagnostics? It could be there's a specific manufacturer code or fault that only Diagbox will see.

[magoo]

Not sure if yours is a diesel so this might not apply, but I had a similar problem for some time and sort of got used to it. Then just a couple of weeks ago I noticed there was a small area of chafing on the vacuum pipe from the vacuum pump. Managed to trim the pipe back past the damage and refitted it. The engine runs a lot smoother now on small throttle openings. I also noticed the brakes were working better. I couldn't see any perforation of the pipe but I think the chafing might have weakened it allowing it to partially collapse under vacuum.

Also, my engine management light used to come on at random, now seems ok so far. :-)

Does your Indy garage use Citroen Diagbox diagnostics? It could be there's a specific manufacturer code or fault that only Diagbox will see.

Thanks for the replies.

Bikey, Yes it is diesel.

Where do I find the vacuum pump/pipe please, def worth a look

Cancunia,  they don't use the Citroen Diagbox AFAIK, will ring them to check

[bikey]

The vacuum pump is located on the right hand side of the block, there are two rubber pipes attached, follow them round checking for splits etc. Fairly easy and cheap to replace if faulty.
I'm going to replace mine with some silicone pipe from the bay. Just a tip, if you take them off, don't suck on the end to check for leaks, they can contain soot. Don't ask me how I know this. :-#

[bikey]

Correction to the above, the two rubber pipes actually connect to the vacuum solenoid which is under the vacuum pump.

[magoo]

Thanks again for the info.

I'm out for a lot of the day so inspection will most probably have to wait till Sunday.

I really hope this is the solution.

[ffrenchie]

It sounds like the good old MAF sensor problem, try disconnecting it.

[magoo]

The vacuum pump is located on the right hand side of the block, there are two rubber pipes attached, follow them round checking for splits etc. Fairly easy and cheap to replace if faulty.
I'm going to replace mine with some silicone pipe from the bay. Just a tip, if you take them off, don't suck on the end to check for leaks, they can contain soot. Don't ask me how I know this. :-#

Thanks again for the info.

I'm out for a lot of the day so inspection will most probably have to wait till Sunday.

I really hope this is the solution.

It sounds like the good old MAF sensor problem, try disconnecting it.

Is that on the right looking from the front? 

The only rubber pipes I can see are on the left (from the front), one with a green ring the other with a white ring.

Whilst looking I noticed the air intake ( I assume) on the right (looking from front) one end goes from low down at the front of the engine compartment on the right (looking from front) and goes to the back of the compartment where it had come off.

I've clipped this back into place.

 as a bye I noticed black insulation tape has been put on the pipe where it inserts into the next stage, maybe to give a better grip?

Started it up OK but yet to drive.