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[viper]

Hi,

I have a 2001 3.0 V6 Auto.

On a morning, when it is cold, the car starts but idles badly. When pulling away there is no power and the car struggles to stay alive. Then after a minute or so I can floor the throttle and away she goes.

The car is fine when warm.

I have replaced the ICV in the summer, but me thinks the cold, damp weather is playing a part?

Any thoughts?

Andy

[chrisgixer]

Temp sensors reading correctly?

(Guessing mind)

[viper]

The temp sensor on the dash reads fine.

There is no power even with throttle hard to the floor. The car remains stationary struggling to idle. Then it suddenly leaps into life after about a minute.

[aaronjb]

Any flashing CEL indicating a misfire?
Can you read the live data? The dashboard temp gauge is fed from a separate sensor to the ECU coolant temperature so that could be reading wrong, as could the intake air temp or MAF, all of which could conceivably do what you are describing, although perhaps coolant temp is the prime suspect.

[chrisgixer]

I guess (again) that it needs a code reader on it with live data to see what temp the Ecu is seeing?

As it sounds to me like it can't tell the engine is cold. Maybe it's relying on a default value, rather than the actual value.

[chrisgixer]

Should add, I'm not very good with electrics, so see what others say

[viper]

No flashing EML when this happens.

The paperclip test reveals nothing.

I have removed the ICV and given it a clean - but it was spotless.

I have tested the car again and the fault is much reduced, but still present. This may be due to today's warmer temperature? This will drop this evening and that's when I will test it again.

Thanks for the help so far. 

[viper]

Tried the car again - worse than ever!

Car starts fine then idle just dies after a few seconds.

Paperclip test reveals fault codes: 57 - Idle air control voltage low, 19 - Incorrect RPM signal, 13 - 02 Sensor 1 Open Circuit.

I have fitted another ICV but this does not solve the problem

Any thoughts?

Cheers

[chrisgixer]

57 possibly historic from the icv replacememt?

13 check the wiring to lambdas.

19 is crank sensor. Replace. Genuine only from dealer. Before it fails completely and won't start at all. (Constant cranking but won't fire) note the plug shape for the dealer, they can't tell the exact part number from epc. You might get two options according to plug shape.

[viper]

The car is stalling when hot as well as cold.

I have replaced the crankshaft sensor with a previous one I had and the problem is the same.

My fear in the past was that there was a dodgy batch of GM/Bosch crankshaft sensors - hence my having to replace 3!

The dealer wants £71.50 for 90540743 / 0261210131

Expensive to keep replacing these things!

[viper]

Brand new crankshaft sensor fitted - has made no difference!

Nightmare!

This Omega has sadly proven to be the worst car I have ever had!

[Andy B]

...
Any thoughts?

Cheers

As above, try the engine temp sensor - the one with a blue/grey socket on top ie NOT the dash temp gauge sender with the single drawing pin connector.

[chrisgixer]

Is there an issue with the loom to crank sensor plug or the plug connection itself perhaps?

....was the icv new? Cleaned and lubed presumably?

[TheBoy]

Where in the world are you, viper?

[viper]

There is nothing wrong with the crankshaft sensor connector / loom.

The ICV is fully cleaned and gets voltage.

To replace the engine temperature sensor would be similar to the removal of the coolant temperature sensor? As per:- http://www.omegaowners.com/forum/index.php?topic=113765.0 ?

This looks like a big job if it is not the sensor!