Maintenance & Repair: Mondeo MOT fail on Emission

"Mike P" <com> wrote in message
news:blk9r6$cddse$news.uni-berlin.de... 

Would help if you could give us the actual readings, age of the car and the
mileage, and any other running faults.

Check the O2 sensor multiplug thats strapped to the rad for corroded
contacts and water ingress (common), the heater vacuum take off elbow behind
the coil pack for splits, the AMM multiplug, and any exhaust leaks pre or
post cat.

Tim..



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"Tim.." <com> wrote in message
news:blkatn$hib$btinternet.com... 
needed 
but 
the 
behind 


It would wouldn't it :-) Can't remember the readings, the car is elsewhere
and the printout is with it. Idle was at 5%, new o2 sensor brought that down
to a pass level. The higher speed reading was 9% and has dropped to 8% with
the new sensor.

It's a 1995 Mondeo LX, 95K miles. Runs perfectly. No misfires, pulls well,
no drop in performance or economy that I've noticed.


Mike

On Fri, 3 Oct 2003 17:58:12 +0100, "Mike P" <com>
wrote:
 

Could be a lot of different things. How has your oil consumption
been? Something simple like a clogged crankcase breather can cause
excess oil consumption. Valve seals also increase oil consumption at
higher RPM.

Since the car does not seem to be misfiring, the electrical system is
probably OK. You have probably checked obvious things like a really
dirty air filter. The air mass meter would make the mixture too lean
if anything so and I doubt if it would effect high RPM operation much.

In article <blk9r6$cddse$news.uni-berlin.de>, stickit@up-
uranus.com says... 

Are you _sure_ the Cat is OK? A hot cat should strip out all the nasties.

As someone else pointed out, all the data would be handy.
High CO points to a dead cat BTW.

Pete.

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"Pete Smith" <org.uk> wrote in message
news:freeserve.com... 
needed 
but 
 

Yes and no, a healthy management system, engine and o2 sensor but a dead cat
should give tailpipe readings of around 1-2% CO and less than 200ppm HC-
i.e. that of an engine without a cat. For you to have 8% CO something is
wrong, whether the cat is working or not.

One thing I forgot to mention in last post- is the engine warming up to full
temperature- temp gauge should be at 12 o'clock?

Tim..


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In article <blm4p9$eu4$btinternet.com>,
com says... 

Too lean? Surely 8% CO would give a low O2 reading as well? If the fuel's
not being converted to CO2, that would imply there's not enough O2 in the
system (or there's too much fuel - same result from different direction).

Very dirty air filter, blockage in the airways, leaky injector?

What effect would having an air-leak upwind of the O2 sensor do? It would
make the ECU think the engine was running lean, so up the fuelling.

Can't a blocked crankcase breather give high CO too? Has the car had fresh
oil & filter recently?
 

And a bit of an Italian tune may not hurt either ;-) I try to give mine a
40 mile blast once a week just to heat the oil up. I used to drive 500
miles a week. If I didn't take the car out once a week now (on necessary
business) the poor thing probably wouldn't get used week to week!

Pete.

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