emissions, help!

[mr.maestro]

efi has failed mot on emissions. totally off the scale for some reason. any ideas appreciated, martin

[G Force]

hi.

Which emissions has it failed? HC or CO or both. Do you have the readings?

Cheers, GForce

[E_T_V]

If it is the same guy who posted on facebook earlier it was CO >9.9%

[mr.maestro]

yeah, apparently CO off scale; 9.9+, hydrocarbons 'all over the place'

[G Force]

yeah, apparently CO off scale; 9.9+, hydrocarbons 'all over the place'

There could be quite a few causes of high CO & HC

I would first be looking at what the fuel pressure reading is. Does it have a standard fuel pressure regulator fitted?

Check the coolant temp gauge is reading correctly

Check the fuel rail temp switch is not short circuit.

Check the camshaft timing is correct.

Does the engine also have a misfire?

Do the readings come down into scale on the fast idle test?

It is possible that the fuel injection ECU is faulty.

Cheers,

Gforce

[mr.maestro]

cheers Gforce, plenty to think about there! it is all standard, have to check on fast idle reading. fuel temp switch sounds possible, would disconnecting it work? ie, make ecu think its open?

[G Force]

fuel temp switch sounds possible, would disconnecting it work? ie, make ecu think its open?

Hi.

Yes that would work as long as there is not a short circuit in the associated wiring as opposed to the switch it's self.

Cheers.

Gforce

[Guest]

That is too high for the car running a warm up map.

Some late EFi's had cats so run a different set up, if it is one of these I'd be looking for leaks, especially in the exhaust system somewhere before the cat.

[Guest]

emissions.

if yr car running too rich theres a mixture screw on back of carb turn it in to weaken this often solves problem . ive owned lots of maestros over the years my tel no 07933761772

[charliecosworth]

if yr car running too rich theres a mixture screw on back of carb turn it in to weaken this often solves problem . ive owned lots of maestros over the years my tel no 07933761772

didn't think the efi had a carb?