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Omega Help Area => Omega General Help => Topic started by: Omega6pot on 20 December 2011, 20:15:11

Title: Omega 2.5 td very sluggish low down after manual conversion
Post by: Omega6pot on 20 December 2011, 20:15:11
Hi, I have just got my omega 2.5td elite manualled and its now very sluggish low down. If you really thrash it the engine eventually picks up but feels asthmatic and unwilling to rev. I plan on remapping it eventually but want this issue cured before doing so. I have had 25 omegas now and the td's normally pull alot stronger than this. Felt quicker with the dreaded AR25 in it. The car has been serviced prior to manualling and is starting on the button, hot or cold.

Any help would be greatly appreciated. I was wondering about the MAF or possibly the little boost solenoid near the power steering resovior?

Cheers Alistair
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: TheBoy on 20 December 2011, 22:05:30
Hmmmmm...  ....wonder if it needs new ECU to make it match the gearbox. What ECU is yours?
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: Omega6pot on 20 December 2011, 22:07:46
Will have a look tommorow, is it just the two letter code that identifies it?  Still running the auto one at the moment
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: TheBoy on 20 December 2011, 22:08:36
Will have a look tommorow, is it just the two letter code that identifies it?  Still running the auto one at the moment
Last 3 digits of it, will be 214, 215, 427 or 428.
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: Omega6pot on 20 December 2011, 22:09:48
cheers i will get it sussed tommorow morning and post up,
Al
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: serek on 20 December 2011, 22:26:53
did car run ok before conversion??
what electric work you done on conversion??
did you clear all code after conversion??
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: Omega6pot on 21 December 2011, 12:45:08
hi, serek, havent cleared codes since conversion, just done the bit of bridging the live feed for starting it. Car ran well on the auto box, it feels very laggy now and gutless
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: Sehen on 21 December 2011, 13:55:36
On automatic's there's a function that retards the ignition, or in the TD's case, the injection timing for a smother gearchange and to go easy on the gearboks at changes. On the petrolversions, there is a wire from the ECU that has to be grounded, or it will run constantly with retarded ignition, hence the low power :)
On the 2,5TD, it is the brown/white wire from pin 24 on the engine ecu that has to be soldered to a brown wire running to/from the engine ECU (brown is ground)

http://www.omegaowners.com/forum/index.php?topic=90592.0 Like this in the maintainance guide, but as said, brown/white from pin 24 on the engine ECU

Hope this will help

Regards Steve :)
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: Sehen on 21 December 2011, 14:33:20
Studying the wiring diagram, it look like if you have connected the wire from pin 42 on the TD ECU to the ground, you must reconnect it.
It runs to the memory seats/mirrors. I dont know what it's doing, but probably sensing the car's speed, so that you cannot change the memory setting's when driving.
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: Omega6pot on 21 December 2011, 16:36:14
thanks guys, just heading to a friends garage to have a play with it, had it on a 'private' road and it would barely do 90 mph, i know they are not a fire breathing dragon but its well down on punch from the normal td's
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: serek on 21 December 2011, 16:53:43
hi, serek, havent cleared codes since conversion, just done the bit of bridging the live feed for starting it. Car ran well on the auto box, it feels very laggy now and gutless
what have you done with gear selector socket??, on socket you got pins from A to H
 try do other bridge with cable from BCD pins see if thats help :y
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: TheBoy on 21 December 2011, 18:16:58
wondering why they spcify different engine ECUs for the different gearbox options...  ...be interesting to hear who else has done TD gearbox swaps....
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: serek on 21 December 2011, 18:52:03
wondering why they spcify different engine ECUs for the different gearbox options...  ...be interesting to hear who else has done TD gearbox swaps....
there few people done swap auto to manual on TD motors and dont have any issue
but they
allways do 2 bridges
one for ignition , so car can start
and other for correct gear so engine ECU wont see fault
thats all
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: TheBoy on 21 December 2011, 19:32:43
wondering why they spcify different engine ECUs for the different gearbox options...  ...be interesting to hear who else has done TD gearbox swaps....
there few people done swap auto to manual on TD motors and dont have any issue
but they
allways do 2 bridges
one for ignition , so car can start
and other for correct gear so engine ECU wont see fault
thats all
:y, thats the news the OP was looking for :)


Wonder why, though, they did a manual and auto engine ecu  :-\
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: serek on 21 December 2011, 21:19:10
wondering why they spcify different engine ECUs for the different gearbox options...  ...be interesting to hear who else has done TD gearbox swaps....
there few people done swap auto to manual on TD motors and dont have any issue
but they
allways do 2 bridges
one for ignition , so car can start
and other for correct gear so engine ECU wont see fault
thats all
:y, thats the news the OP was looking for :)


Wonder why, though, they did a manual and auto engine ecu  :-\

maybe they do 2 different ECU, dont really know  :(
but if live auto box ecu plug in and select right gear then engine ecu wont know car is manual and will run with out any problems
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: Omega6pot on 01 January 2012, 10:31:03
Hio guys n gals, small update, i got the omega de-catted on friday, seems the original one had been replaced with a smaller cat which had also given up the ghost. With this cat removed car is now alot more lively and revs cleanly. I will have to check about getting this second bridge done. The bridge is my car is in the engine bay and is for the live feed so it will start. Where would the other bridge be fitted and to what? Many thanks AL
Title: Re: Omega 2.5 td very sluggish low down after manual conversion
Post by: noel on 01 January 2012, 11:01:11
Hmmmmm...  ....wonder if it needs new ECU to make it match the gearbox. What ECU is yours?
took the words out of my mouth ;)