Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: M Kerr on 13 April 2009, 13:39:41
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Hi All,
Since rebuilding the top end of my 2.5 V6, an annoying misfire has developed. It ran beautifully for a few hours but rarely seemed to drop a pot, now ticks over bumpy and continues to be unbalanced at any higher revs. (It has not been run on the road yet)
Paper clip test gives (running and stopped):
12
19 (incorrect rpm signal)
135 (Teltale (checklight) low voltage
12
Any ideas?
Cheers,
Martin :-/
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cranksensor is buggered, needs changing before you take it on the road. The 135 can be safely ignored.
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Thanks The Boy, do you think that will account for the seeming misfire? :y
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Whilst I am getting a new cam sensor sorted, just a note that as if to check the sensor, I disconnected it completely at the connection to the rear of the plenium and tried to start. It made no difference and ran exactly the same!!! Strange, I wouldn't have expected it to run at all. Any comments... :-?
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obvious question, are you sure it was the crank sensor plug?
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:-[ Duh!!!!! Spot on Chris. What a k4ob!
I knew it was a miracle and just wanted to share it with everyone. Next trick... walking on water. ::)
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:-[ :-[ :-[ :-[
Just changed the crank sensor. Started up... a fraction better perhaps but still obvious misfire!! Paperclipped again and got the same 12,19,135,12 !!!!!!
I've tried prozac but that hasn't realy helped. Any thoughts any one?
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Sorry bud I can't help. I'm trying to get rid of code 19 AND 10 other codes from mine. I did the same as you have replaced the crank sensor with no joy. I've also replaced the dis pack. Next step for me is loom change and if that fails then another ecu.
Best of luck mate. If you do find the reason make sure to post it up. You never know it might help me :y
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Is yours running OK Doz?
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Mine is running like a lumpy old diesel. Misfires, back fires and the idle is very poor
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Sounds just like mine, it was purring like a kitten but slowly started to drop a pot occasionaly now sounds like its running on 5 cyl.
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5. I'd be happy with that mines more like 3 and half!!!. Mine to has not long had a top end rebuild. I'm picking the loom up tomorrow.If that works I'll try finding the fault in the old one to give you a heads up.
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Superb Doz, I hope you get sorted and I'm keen to know how you get on. Mine was running like new after the rebuild but slowly deteriorated. Was yours running OK?
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Have you checked the sparks?
Trird New Plugs?
Tried New Leads?
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Checked spark plugs, they were sound and have only done about 500mikes since new. It hasn't done a lot to deteriorate the leads since running beautifully. It hasn't been on the road only ticking over really for 10 maybe 20 mins at a time. Just sort of slowly happened.
Fully answering, haven't checked the leads.
FC 19 is still a mystery though. Can the code history be wiped or does it jus sotr itself out?
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I got mine running like it is. Apparently the engine has covered a couple of thousand miles before it started running like a shed. They just sat it up for 3 months and left it like that. Then Muggins got to hear about it and got tempted in. Just what I need another basket case.
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When I checked my leads with the multimeter, one lead has zero resistance, but engine misfires only under some conditions. Therefore, the lead must be internally sparking over to deliver a weaker spark at the plug. Fitting new Bosch leads next week and if problem is solved I'll post here again. Maybe your problem is similar.
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Thanks Jampy, I look forward to hearing how you get on.
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Anyone near you got the ability to clear codes and reset block learn values, and see what comes back?
Also, 135 sounds like EGR, is it properly connected?
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What does this wire do? I took this photo during the rebuild. There is a wire which I have (incorrectly i think) fed behind the rear cambelt cover. In the photo it comes out beside the altenator and as can be seen, at some stage someone has done a poor looking (masking tape) repair to the wire. Could it be effecting my fault code 19 error?
For some reason I cant insert the image!!! Basically this connects to a wire emerging from the front cable transfer tray on the front of the cambelt cover.
(http://)
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What does this wire do? I took this photo during the rebuild. There is a wire which I have (incorrectly i think) fed behind the rear cambelt cover. In the photo it comes out beside the altenator and as can be seen, at some stage someone has done a poor looking (masking tape) repair to the wire. Could it be effecting my fault code 19 error?
For some reason I cant insert the image!!! Basically this connects to a wire emerging from the front cable transfer tray on the front of the cambelt cover.
(http://)
Sounds like knock sensor for bank 1 3 5
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Thanks The Boy, The EGR copper pipe connection was loose (ish) when I had off during rebuild so I couldnt resist tightening. The elec connector all seems to be OK but I'll have anothe look.
Could the knock sensor be part of my problem do you think?
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Thanks The Boy, The EGR copper pipe connection was loose (ish) when I had off during rebuild so I couldnt resist tightening. The elec connector all seems to be OK but I'll have anothe look.
Could the knock sensor be part of my problem do you think?
Knock sensor will make the car appear to hold back above around 2k rpm, and should bring on EML (and store a code)
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It's not that then. No EML and no probs reving to 5K+. I don't like to push it past that. I would note though that some times at higher revs it it does all seem to be firing properly. Not allways but definately some times.
Re: Anyone near you got the ability to clear codes and reset block learn values, and see what comes back? I've no idea. Is this worth a seperate post?
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Today I fitted new plug leads and my similar problem has completely cleared. Is it possible one of your leads broke while you did the rebuild? At least check them for resistance/continuity with multimeter to eliminate as possibility.
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Thanks Jampy. I'll check them out when I get back from working abroad in a couple of weeks. Out of interest what did you pay for leads? :y
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My Bosch leads cost £20.78 plus £4.49 postage from Powersparks on ebay. The leads for your car would cost £39.95 plus £4.49 postage. My leads were slightly longer that the originals but the extra allowed more slack at the Dis pack. Your leads can be seen on this link:
http://cgi.ebay.co.uk/BOSCH-Silicone-Spark-Leads-VAUXHALL-OMEGA-2-5-3-0V6_W0QQitemZ180344865829QQihZ008QQcategoryZ9886QQcmdZViewItemQQ_trksidZp1713.m153.l1262
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Thanks Jampy, I'll get this sorted wehn I get Back from Bahrain. :y