Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: prestigetravel on 15 November 2009, 20:55:45
-
Hi everybody,I am new to the forum.I have had several omegas in the past and have long wanted a facelift so recently bought one with a few problems and would now like the benefit of your help.
When you insert the key and turn to position 2 neither of the eml lights come on. The engine turns over happily but doesn't try to fire at all. Keep turning until the battery is flat and just as it struggles it's last turn over the eml with the spanner in flashes and the engine fires up!! Now it's running the traction control light and the other eml without the spanner are lit up constantly. Now it ticks over smoothly but when u press the accelerator it only rises about 100rpm. Today I left it idling for a hour and a half whilst I checked all the wiring and connectors and then turned it off. Tried to start again but again turning over happily but not firing at all until after 10 mind when battery dead again!!
Previous owner tried paperclip test and couldn't get eml lights to illuminate for test, he had it plugged into diagnostics but they couldn't get it to read, rac recovered me, put easystart in air box and car didn't fire when turned over.
I was a mechanic years ago before the advent of ecus etc I wondered if this may be either an ecu or immobiliser problem?
Any help truly appreciated.
-
Removing the warning lights is a classic bodge to hide engine management faults. Makes it hard to do the paper clip test (or pedal trick) though.
I would check that the lamp isn't missing then try again.
When I got my 2.6 the battery was dying and it was difficult to start (but not as bad as yours).
-
You need to use the pedal trick, not paper clip test.
What I don't know is if you can damage the diagnostics socket by trying the paper clip test on a 2.6. :-/
Pedal trick here http://www.omegaowners.com/forum/YaBB.pl?num=1189022687
-
Paperclipping a 2.6 shouldn't damage anything. Try the pedal trick (see below) and post the codes. :y
-
Will try pedal test but previous owner tried and could get no lights to show codes. Both bulbs are ok in ell lights as the one flashes briefly as engine decides to start and once running the other without spanner on stays lit up.
Can't understand why neither eml lights up when ignition key turned to live. Previous owner told by garage that edu fried as they couldn't get a read connection on diagnostics so purchased car expecting this may be what I have to do. Just seems odd of will idle ok!?
-
volt dieode gone in ecu, happens when the engine is turn'd off and on on sort trips, vectras have same problem.
-
Try starting it with MAF disconnected. If it starts and revs you need a new MAF sensor!
-
CLASSIC MAF sensor fault symptoms for this unit.
A proper T2 session would confirm.
Never seen or heard of this diode fault mentioned (nor can I imagine how it could happen given my lectronic knowledge)
-
somebody else had this a couple of weeks ago. Not sure the cause. Might be worth a search. Seem to remember crank sensor being involved somewhere along the line, but my memory is crap.
-
Hi again, thanks all for your ideas. Have tried all day and can't get pedal test to do anything. Removed wiring to maf sensor and no different. Also disconnected crank sensor plug and two other plugs on top of as you look at engine right hand bank , I assume one to be camshaft sensor. And with these three and the maf diconnected engine still happily ticking over!!!?!? Now totally baffled.
-
Just in case we have been diagnosing the wrong car....
You are referring to the 2000 MY (model year) 2.6 V6 that shows up against your profile?
-
volt dieode gone in ecu, happens when the engine is turn'd off and on on sort trips, vectras have same problem.
Errr yeh.... :-? :-? Where did you get that one from?
-
EUREKA (maybe)
Symptoms
1. won't rev up
2. pedal test doesn't work
I suggest you do some fault finding on the throttle pedal.
-
Surely a 2000 year will be a 2.5 not a 2.6 so it will be the paperclip test
-
It's definately a 2.6 it's an x reg registered end of nov 2000, while i was looking to buy one came across several x reg 2.6 registered nov/dec 2000 even though official launch date was jan 01
-
So it looks like the second picture?
(http://images.omegaowners.com/images/techinfo/v6enginebay/v6enginebay.jpg)
(http://images.omegaowners.com/images/techinfo/v6enginebay/enginebayV6FACELIFT.jpg)
http://www.omegaowners.com/forum/YaBB.pl?action=post;num=1258318545;virboard=;title=PostReply
-
Yes definately the 2nd,has newer design twin plenum and rocker/packs. I hpi'd it as well. I spoke to a friend at local vx dealer,says that lots of car new models get pre registered before official launch date,I saw 4others with end of 2000 1st reg dates some on eBay now
-
volt dieode gone in ecu, happens when the engine is turn'd off and on on sort trips, vectras have same problem.
Errr yeh.... :-? :-? Where did you get that one from?
there is a dieode in the ECU that when its going will only work at low volts not 12volts, ecu will still work but only when the volts to it go low. has two volt side one only for start up and one for running, also readers cannot conect to ecu as trying to force 12v into it so will not light up, have one here that is like it, just swaped ecu and was back to norm. oh and it shuts down to limp mode, maf off- cam off- crank off- reader inface off etc.
-
Yes definately the 2nd,has newer design twin plenum and rocker/packs. I hpi'd it as well. I spoke to a friend at local vx dealer,says that lots of car new models get pre registered before official launch date,I saw 4others with end of 2000 1st reg dates some on eBay now
OK so you do have the DBW (drive by wire) engine so it is not going to respond to the paper clip.
If my suspicion that there is something wrong with the throttle pedal potentiometer is correct then it isn't going to be possible to do the pedal test so I am hoping that there is someone local to you with Tech 2 who might be prepared to plug in and read live values.
-
Right I'm sorely tempted to sort ecu. Anyone know where I can get it repaired at a sensible price? If not I've read somewhere on here that you have to change several parts of buying a second hand ecu. Any help appreciated.
-
So, you can (eventualy) start the car and then pressing the accelerator pedal....nothing happens?
-
Yes that's right it revs up about 100rpm from tickover. I've just spoken to an ecu specialist I found online in London and he's told me to check fuel pump relay as common fault and also wiring around diagnostic plug. Says if relay faulty can cause no eml lights and not to rev up!!?! Any idea which is the fuel pump relay ?
-
I have found an ecu on a breaker. What parts do I need altogether? Also the main number which is 0261206490 is identical to mine but some of the other numbers after are different, are these just serial numbers? Will an ecu off an automatic be ok as mine is a manual gearbox?
-
Yes that's right it revs up about 100rpm from tickover. I've just spoken to an ecu specialist I found online in London and he's told me to check fuel pump relay as common fault and also wiring around diagnostic plug. Says if relay faulty can cause no eml lights and not to rev up!!?! Any idea which is the fuel pump relay ?
Well ignore him....hes talking shite....if either the fuel pump oo ecu relay were caput then it would not run
Does your ecu light work?
-
I have found an ecu on a breaker. What parts do I need altogether? Also the main number which is 0261206490 is identical to mine but some of the other numbers after are different, are these just serial numbers? Will an ecu off an automatic be ok as mine is a manual gearbox?
STOP.....lets diagnose this rather than run down blind alleys
-
the eml bulbs do work but not when key is at position 2 and engine not running. the one with a spanner flashes briefly when car decides to start eventually, and once running the other plain engine one stays illuminated constantly. have spoken to everyone i know who are mechanics still as i was a mechanic myself for several years many moons ago and they all are saying ecu and maybe throttle potentiometer. i am tempted to take it to local vx dealer which is 12 miles away at 30mph as they quote £32.50 for tech2 diagnosis.
previous owner had diagnosis but showed no read, vx tell me thats because eml's not illuminated at position 2 and with tech2 they can read on live run when running as light then is illuminated. any ideas?
-
the eml bulbs do work but not when key is at position 2 and engine not running. the one with a spanner flashes briefly when car decides to start eventually, and once running the other plain engine one stays illuminated constantly. have spoken to everyone i know who are mechanics still as i was a mechanic myself for several years many moons ago and they all are saying ecu and maybe throttle potentiometer. i am tempted to take it to local vx dealer which is 12 miles away at 30mph as they quote £32.50 for tech2 diagnosis.
previous owner had diagnosis but showed no read, vx tell me thats because eml's not illuminated at position 2 and with tech2 they can read on live run when running as light then is illuminated. any ideas?
Because they dont have the balls to say they dont know!
Right, unplug the MAF sensor and see what it does.
-
Try starting it with MAF disconnected. If it starts and revs you need a new MAF sensor!
As I said earlier - from personal experience! :y
-
did it yesterday,just tried again, makes no difference
-
Ok, pop the air pipes off the front of the plenum and try starting it up....as somebody presses the throttle pedal, observe the throttle butterflies
-
right, butterflies dont move at all
-
Ok, check wiring to the accelerator pedal
-
It could be time to edit the "maybe" out of post #12.
-
all seems ok, just tried with pedal unplugged, still same symptoms.
-
only time my throttle pedal failed to actually rev the engine was down to failing cam sensor
-
SO, you need proper diagnostics.....to get live ecu values.
Are all the large connectors at the rear of the battery ok?
-
all seems ok, just tried with pedal unplugged, still same symptoms.
just curious how far are you from jct 25 of the M25, could poss help you out, fresh pair of eyes and all that
-
cheers for that but im probably approx 200 miles from you, my mate lives in walthamstow and thats 160 miles from me, cheers anyway
-
all battery connections ok. just noticed taped up strap hanging under front as ive moved it, its bolted to front crossmember and at a glance looks like it should go to bolt on engine by sump! have held it to engine whilst wife watches panel, no difference, but know engine earth straps well known for breaking and causing problems. bolt snapped off so will tap it out in morning.
-
Earth straps not known to cause issues on Omegas but...not a good thing!
So, one fault found to address.
-
yes, just dragged the wife away from im a celebrity,jacked up front and got her to watch dash again, no change! looks like homemade strap, dont think its part of this issue.
you seem a knowledgeable fella, what would you do? i really want to get driving this beauty!