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Author Topic: failed mot emissions  (Read 798 times)

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swordfish

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Re: failed mot emissions
« Reply #15 on: 06 June 2018, 14:38:06 »

it seems to have been bypassed the pipe from the drivers wheel arch goes direct to the bridge will it still run correctly  :-\ :-\
thankyou
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Doctor Gollum

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Re: failed mot emissions
« Reply #16 on: 06 June 2018, 14:39:35 »

Clearly not ::)
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swordfish

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Re: failed mot emissions
« Reply #17 on: 06 June 2018, 14:48:42 »

ok thankyou , what does this vacuum sphere do 
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Re: failed mot emissions
« Reply #18 on: 06 June 2018, 14:50:49 »

Right, do the following, in order and report back...

1. Turn ignition to 2.
2. Measure the voltage at both plugs. 1 will be 5v, the other 12v. Label them.
3. Turn the ignition off and pull the key.
4. Buy a new ecu temp sensor.
5. Fit new ecu temp sensor and plug the 5v plug to it.
6. Fit the 12v plug to the purge valve.
7. Obtain and fit the plumbing from the tank to the purge valve and from the purge valve to the breather bridge.
8. Refit everything else currently removed.
9. Triple check all the vacuum and breather hoses, including at the front of the engine.
10. Re present the car for its MoT.
 :-X
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swordfish

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Re: failed mot emissions
« Reply #19 on: 06 June 2018, 14:56:34 »

ok thankyou . in that case i will need to buy a new purge valve as the back has broken off it were the pipe connects
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Kevin Wood

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Re: failed mot emissions
« Reply #20 on: 06 June 2018, 16:19:48 »

As a test that this is your (only) problem, if you disconnect the pipe to the wheel arch canister and block the resulting empty hose barb on the breather bridge, it should then idle better.
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Re: failed mot emissions
« Reply #21 on: 06 June 2018, 16:49:33 »

ok thanks ,., just tried that and no difference. when you start from cold the engine revs are low.  :-\ :-\ usually when you start from cold the engine revs are higher due to the cold start operating
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swordfish

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Re: failed mot emissions
« Reply #22 on: 12 June 2018, 09:47:33 »

HI,,  ok passed the mot emissions . but its still misfiring at high rmp it then continues to misfire on what feels like 3-4 cylinders and then as you drive at lower speeds it gradualy comes back on 6 cylinders     :-\ :-\
any ideas
thankyou
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Re: failed mot emissions
« Reply #23 on: 12 June 2018, 11:47:42 »

Coil packs, contaminated plug wells (oil/water), knackered or fouled plugs, or a wiring fault...

Which depends on which cylinders are mis firing... Car can tell you that. ;)
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Re: failed mot emissions
« Reply #24 on: 12 June 2018, 11:51:12 »

ok thankyou , drivers side coil pack  :y :y
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swordfish

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Re: failed mot emissions
« Reply #25 on: 12 June 2018, 11:54:29 »

this particular 3.2 omega has got the earlier exhaust and cats fitted  from a 3.0 so only uses 2 lambda sensors  :o :o is there any reason somebody would do this
Thankyou
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Kevin Wood

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Re: failed mot emissions
« Reply #26 on: 12 June 2018, 11:56:50 »

It may have needed new cats and only the 3.0 style were cheaply available, or maybe someone thought they'd be less restrictive.

If you don't have post-cat sensors fitted, then you will never have a happy ECU, so I assume the engine management warning light has been removed, or is constantly on (which is now an MOT fail).
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Re: failed mot emissions
« Reply #27 on: 12 June 2018, 12:00:01 »

Hi,, yes now and again the engine warning light comes on , will it affect the performance missing the sensors
thanks
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cam.in.head

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Re: failed mot emissions
« Reply #28 on: 12 June 2018, 12:42:38 »

If the two post cat lambda sensors are not there I would have thought the eml would be constantly on .registering various faults such as heater coils,lack of action etc so I wonder what they have actually done. Is there anything plugged into where they should be ?.these donít usually respond well to o2 imitator modules and usually only work by moving the second sensor post main cat. As you sure they are not fitted just not in sight ?
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Re: failed mot emissions
« Reply #29 on: 12 June 2018, 12:45:23 »

Yep, I'd also expect a constant EML. It's possible they have been fitted to the 3.0 cat sections or that the sensors are still connected but not fitted to the exhaust.

They only perform a monitoring role, but not having them fitted means you won't find out about any other faults, as they will be masked.
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