22 replies to this topic

[mickyh]

Argh! its back!

Previously this was cured, the car used to stall once warm and then would start until cold again, cured this as it was running rich, so new temp sensor and its been fine.

Now it has started cutting out when at junctions, in slow traffic and idling. When foot down and making headway its fine.
When trying to start there is a little miss fire!

Recently had:

New plugs, leads, temp sensor, Lambarda sensor, fuel filter.

Fuel is getting through OK, and their is a spark. It sounds like electrical/ignition fault to me, however surely it would cut out at speed.

Edited by mickyh, 25 June 2010 - 01:30 PM.

[njathind]

Argh! its back!

Previously this was cured, the car used to stall once warm and then would start until cold again, cured this as it was running rich, so new temp sensor and its been fine.

Now it has started cutting out when at junctions, in slow traffic and idling. When foot down and making headway its fine.
When trying to start there is a little miss fire!

Recently had:

New plugs, leads, temp sensor, Lambarda sensor, fuel filter.

Fuel is getting through OK, and their is a spark. It sounds like electrical/ignition fault to me, however surely it would cut out at speed.

Sounds like it could be a collapsed cat?

The exact thing happened with the family MPV and it turns out it was the cat had collapsed

[Colin cooper]

i've got a similar thing with my mpi. It was stalling and juddering at low revs/steady revs. I renewed the fuel filter and cleaned up temp censor, gave him a service and it ran very smooth for for about 1000 miles, now its starting again.

would a rover code reader thingy tell me the problem even if it was the cat?
cheers

[njathind]

When it went on the MPV we spent months getting it plugged in and seonsors changed a sa precaution and what not, it was only when a family friend took a look at it that he had found the cat had collapsed. So I doubt a coe reader could tell you, I think the best thing to do would be to take off the cat and inspect it, if all is well then get it plugged in and see if its a sensor. So far as I'm aware only the jap export models had a sensor in the cat, and that was only for when it was overheating not for fault finding.

[Blatherskite]

Could also be an air leak - have you checked the small hoses to the ECU from the manifold? If allis OK when cold and gets worse when warm, then mixture might be the problem if air is leaking in through split hoses. Costs not a lot, and might prevent a load of expensive diagnostics... can't say anything bout collapsed CAT, except that it sounds expensive - and why would that cause problems only when warm...?

[njathind]

Could also be an air leak - have you checked the small hoses to the ECU from the manifold? If allis OK when cold and gets worse when warm, then mixture might be the problem if air is leaking in through split hoses. Costs not a lot, and might prevent a load of expensive diagnostics... can't say anything bout collapsed CAT, except that it sounds expensive - and why would that cause problems only when warm...?

I'm not entirely sure as to why it's only when warm but the symptoms matched that of our family van exactly, of course it could be other things this could just be one of them, by the way is it an spi or mpi engine?

[Colin cooper]

thanks for the replys guys (even if i do feel like i have hijacked this thread a bit )

i don't think it is the vaccum hoses, i had a quick look at them and they look good as new, although i will remove them to inspect them properly. Also, i can't here any hissing sound from the engine bay.
It does it even when its cold, first start of the day. It seem funny how it seemed like i had solved it, and it ran fine for about 1000miles, maybe that sensor i cleaned is starting to pack up now...?

i know nothing about exshausts, whats the best way to inspect my cat? (the cat on my mini that is, lol)

cheers
Joe

[njathind]

I'd assume just to take it off and look inside, when we took the one off the van there was this fluffy muck comming out of it so the cat was way past it.

[Colin cooper]

ok thanks, Najathind

[mickyh]

When mine was cutting out as it got warm it was the temp sensor, we replaced this and it ran well; now however I fear it could be the Lambarda or similar. It is odd that we are not getting any black smoke out of the exhaust, the only indication that it is running rich is the sooted plugs!!

[minicooper1.3i]

check out the topics on map sensor and associated wiring. they often fail due to engine rock straining the loom and when they start breaking it often causes the car to stall when you drop the clutch at junctions.

I recently had a collapsed cat and it didnt cause the symptoms you describe, merely a lack of performance and a funny noise.

[Colin cooper]

check out the topics on map sensor and associated wiring. they often fail due to engine rock straining the loom and when they start breaking it often causes the car to stall when you drop the clutch at junctions.

I recently had a collapsed cat and it didnt cause the symptoms you describe, merely a lack of performance and a funny noise.

ok, i'll take a look at that as well, thank you.
It does do it alot more coming up to junctions, had a few dodgy moments where i realised its stalled and had no brakes....i havn't hit anything tho, *touch wood*

..nice mini by the way

[mickyh]

All apart and back together and still the same, diag tomorrow.

Its really strange and it idles fine and goes great, its just that point where go from idle to higher revs it bucks and cuts out; starts straight away though??

[minicooper1.3i]

Any update on this?

I had a few running issues on mine where I was getting sticky throttle, over revving and kangaroo juice when crawling in traffic. Stripped the inlet manifold down, cleaned all the sensors and every part I could reach with white spirit and a tooth brush and then lubed all moving parts with silicone spray, inc. IACV.

After refitting and adjusting the idle screw and throttle cable it's now running sooooo much sweeter. Damn near purrrs through traffic and mpg is way up in the mid 40's!

..nice mini by the way

Cheers, but that's an old picture. Sold that one last year. Got the same now in Nightfire Red with a third of the mileage

[Colin cooper]

yeh, my mate said he's got a spare MAP sensor which i'm going to try, if it sorts it out i'll buy a new one. Maybe i'll try what you did as well, give it all a strip and clean. Its stalling alot now though so i reckon the sensor is knakered. I reckon the sensor i cleaned (green sensor on the manifold...MAP sensor...?) last time is on the way out now, after cleaning it worked fine for 1000miles.

i'll let you know what happens,
cheers, Joe