Omega Owners Forum
Omega Help Area => Omega Electrical and Audio Help => Topic started by: VOYAGER on 10 November 2013, 20:47:56
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Hello,
My car has some problems with starting the engine as the weather gets cooler in the mornings here. :(
At every cranking, it vibrates as it is running but no success. After 8-10 cranking attempts, engine starts finally like it has never faulted... After a successful start or when the engine is hot, everything is normal... >:(
Could it be clogged fuel filter or a faulty fuel pump? :-\ For the information, I have already had the crank sensor replaced 3 months ago.
The car is 1998, 2,5 V6, Auto... Any ideas???
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idle control valve and breathers need a clean :y--also think this thread should be in general help ;)
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Sounds fuel related - could be clogged filter or pump or loss of fuel overnight from fuel rail/injectors
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initial estimation : ignition or fuel related.. you say when it gets hot everything is normal , so it leads me to the point to imagine there is an electrical problem when cold.. and another question is does it really spark when cold ? if yes, then you can continue with the fuel componentchecks..
ps: this thread belongs to general help section.. so admin intervention required :)
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Sounds fuel related - could be clogged filter or pump or loss of fuel overnight from fuel rail/injectors
Thanks dbug...
I think I will replace the fuel filter first and then check other issues...
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initial estimation : ignition or fuel related.. you say when it gets hot everything is normal , so it leads me to the point to imagine there is an electrical problem when cold.. and another question is does it really spark when cold ? if yes, then you can continue with the fuel componentchecks..
ps: this thread belongs to general help section.. so admin intervention required :)
Thanks Cem...
As I mentioned above, I will replace the fuel filter first... :-\
You are absolutely right...I have not noted that this issue was directly related with General Help, while I was searching such as "engine cold, cold start, etc...".
So, with apologies, may I ask from Admin to move this to the General Help section? :-[
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Today, the problem solved... :y
The faulty one was the COOLANT TEMPERATURE SENSOR, as it was identified by Kevin Wood on the December 8, 2009... ;)
Thanks to Kevin, since he has explained the details and described the fault almost four years ago in a topic "3.0 mv6 hard to start when cold" as follows:
Is it turning over at a reasonable speed on the starter? YES :y
Does it start if you turn it over with your foot flat on the accelerator for a few seconds and then start it normally? YES :y
Does it idle and run Ok once it is running? Idle speed control OK? No misfires? YES :y
It would be worth doing a paperclip test to see if there are any codes stored. Not all of them light the EML. NO CODE...
If the above all checks out OK I would be checking the coolant temperature sensor. perhaps the ECU is not seeing the true engine temperature so is not enriching the mixture enough when cold. ;D :y :y :y
Thanks Kevin...
As a hint, there is no need to remove the plenum and the manifold. ;) To remove the scuttle drain is enough to reach and remove/replace the CTS. It just takes not more than 20 minutes if the engine is cold enough to touch... :y
I will add the pictures if I can do... :P
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1. Remove wipers and the scuttle drain (Driver side on LH steering)
(https://www.dropbox.com/sc/p2rjq4q6eowmoyl/jfd8KOYcWZ)
2. Remove rear multirams and position the spanner (19 mm)
(https://www.dropbox.com/sc/pvy6nd9tyngwhsl/lgF1HdZqK1)
3. Spanner
(https://www.dropbox.com/sc/rlwg50dufbu1ckp/EOPFbZaUVv)
4. CTS became like that after 15 years... ???
(https://www.dropbox.com/sc/ckoohrp9liha60i/Uu2xCCTFsC)
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I am back again with the same problem... :( :'(
After replacement of the CTS, a few days later, the same problem has risen again ... >:( >:( >:(
Except for the CTS, the things I have done related to this are:
* Cleaning ICV
* Cleaning butterfly valve
* Replacement of fuel filter and pump
No EML and no fault code... So, what else can I do before kicking her to the junkyard???? :-X
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Voyager, first things first..
you have to be sure for 2 things..
is there a spark when you turn the ignition when its cold
http://www.youtube.com/watch?v=ZceAZgZBn9E (http://www.youtube.com/watch?v=ZceAZgZBn9E)
if there is, then fuel pressure and pressure drop can be checked via manometer
and also a tech2 may help to monitor the engine..
but nowadays as weather is relatively hot you have to wait for minus temperatures ..
ps: I assume you checked your battery voltage and battery terminals..
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Check the large round electric plugs behind battery are properly connected and not loose ;)
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Check the large round electric plugs behind battery are properly connected and not loose ;)
Thaks for the advice... :y
Even if the connector was slightly loose, it did not work. :(
Whenever the weather is warm enough, it starts normally. But, when it is colder, it is rather hard to start the engine unless I step down the accelerator even this won't work most of the time... :'(