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What can cause rich idling?

Cheers Colin will do. Should get it Thu/Fri depending when I can get down to OPC. Hope to fit it Friday afternoon. Failing that be Monday probably as mad busy all weekend!

Stuart
 
Update tonight. Changed DME temp sensor. No difference. Changed FPR, no difference. Still exact same then idling at mid 11's when heated up. Did notice that with vac unplugged from FPR the idle went up to high 12's. Any significance to that or any other ideas chaps? Did the same with both FPR's incidentally which leads me to believe FPR is fine. So to recap it would seem ICV is fine, FPR is fine, DME temp sensor is fine, TPS is fine, no vac leaks. AFR's all look ok on throttle just idling rich!!

Argh

Stuart
 
Worn injectors? Especially if they are the original ones, though looking at all the other stuff you have done to the car I imagine you probably upgraded to new 55 lb injectors when you were getting the rest done.
 
I had 55's but had problems getting it running right so reverted back to standard injectors, they were serviced and cleaned a wee while back. I did think about this but I'm sure I would have other running issues with worn or leaky injectors, which i don't!

I think I will get a probe up the exhaust to check CO at idle in case my lambda sensor is at fault. It's about 2 years old and fitted in the factory bung. I have heard stories of them not lasting too long in that location. Does anyone know if the lambda sensor can be cleaned? It does however sit at stoic (14.7) with the engine off after self calibration.

Still puzzled.

Stuart
 
Update this afternoon. Been to mot station. CO through the roof, over 10% at warm idle after a 30 min run. MAF gone bad?

Help!

Stuart
 
Do you still have chips to go back to afm just for testing Stu? Obviously assuming you still have the AFM?
 

ORIGINAL: robwright

Do you still have chips to go back to afm just for testing Stu? Obviously assuming you still have the AFM?
Click to expand...

That would have been sensible however my AFM disappeared in Al's garage never to be seen again! And I never had standard chips, my car had a superchips chip in the DME when I got it!

HOWEVER! The problem is solved. And popping a barn door back on would have solved the issue. It was MAF related but not the sensor itself, they always fail lean, it was in the little control box that sends the signal back to the ECU. The genius that is Jon Mitchell pointed me towards it after kindly analysing some data he requested when we spoke earlier. CO, HC, various AFR's etc. Turns out one of the potentiometers was stuck in the control box. A zero cost repair and fuel bills set to tumble dramatically! Delighted doesn't sum it up. I thought the old bank account was about to be hit with a vitesse maf type hole in it as I didn't really fancy regressing back to barn door technology!

Cheers

A delighted Stuart
 
Glad to hear it Stu. Jon certainly knows his onions lol. Incidentally my 55lb injectors purchased from Jon with chips returned a perfect CO reading on MOT with my rebuilt engine. Even with the crappy old barn door [;)]
 
Good stuff Rob! I think I nearly melted the gas analyser earlier lol! Yes Jon is a top man, onions well kent!

Stuart
 
It dif fail on a manky sill and a bald tyre though. At least I was expecting those. Whoops the new tyre turned into a full D90 refurb though.
 

ORIGINAL: robwright

It dif fail on a manky sill and a bald tyre though. At least I was expecting those. Whoops the new tyre turned into a full D90 refurb though.
Click to expand...

Pics needed [;)]
 
Good to hear!
What model of SciVision MAF do you have, is it the older one with the gold rectangular control box or the later one with a cylindrical control box?
 
Well done Stu and JMG !....................All good learning for us, get the oil changed, as when i was having starting problems i did not always pull the DME and the oil was being flushed with petrol, when i dropped the oil you could smell fuel in it................Alasdair's advice BTW.
 

ORIGINAL: TTM

Good to hear!
What model of SciVision MAF do you have, is it the older one with the gold rectangular control box or the later one with a cylindrical control box?
Click to expand...

It's a mark 2. Has a 951 part number and a silver rectangular control box.

I would quite like to source another control box off a trashed one somewhere to have a play with and have spare.

Stuart
 

ORIGINAL: Frenchy

Well done Stu and JMG !....................All good learning for us, get the oil changed, as when i was having starting problems i did not always pull the DME and the oil was being flushed with petrol, when i dropped the oil you could smell fuel in it................Alasdair's advice BTW.
Click to expand...

My thoughts exactly Jim. Oil n plug change this week!

Stuart
 
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