Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: RossMk2 on 03 July 2009, 16:13:29
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Hello people, just signed up sorry for getting straight to the point but i am at end of me wick now and hopefully you guys can help. I did post in an old thread that someone seemed to be having the same trouble but a new thread was needed! hehe
I stumbled across this thread using google (who'd have thought it!) i have an AstraMk2 running an early 94 X30XE omega engine. Its running terribly, misfires at mid range and clears further up the range.
I have changed many things, new oxygen sensors, ICV, plugs, leads, DIS pack all sorts! Tried known working MAF from other engines and still the same, i find the car is more driveable with the MAF unplugged but still a noticeable misfire real low down. I have no EML light on but when i flash the codes im getting 73 & 19 weither this is because i was running with the MAF unplugged i dont know but what i do know is a new crank sensor has been installed which i got from AutoVaux and still nothing! Anymore ideas peoples?
Thanks,
Ross
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Was the crank sensor a genuine Vx part? If not that could well be your problem! ;)
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there have been several instances of non genuine crank sensors causing issues....
If the 19 is there....your car is not getting a good crank signal.
Send it back and get one from Vauxhall.
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Its a part from AutoVaux and have never had trouble with anything of their's before?
Also acctually changing the crank sensor didnt make a difference ot the running of the car. If the crank sensor is busted would the EML light be on, i dont understand why i can flash codes out but they dont show up themselves.
Edit: Just noticed that someone else seems to be having the same trouble and changed the CS and all was fine, surely a brand new part vaux or otherwise wouldnt be broke as soon as its been installed? Also with the engine being in the astra the crank sensor doesnt really run near anything too hot that would ruin the wiring.
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stupidly 19 doesnt light the EML, despite the fact it causes bad running, stalls, and total breakdowns.
more than a few on here have had 3rd party cranksensors doing exactly the same as yours.
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How much of a wounder is it when you buy a part then it could still be that at fault? Hehe i have phoned Vaux up and they can do it me for £46 which i dont thinks a bad price, but they only list 1 type, and i know of 2!
Im gonna re-do my induction also just to make sure there are no leaks or anything but it just doesnt seem to justify a leak thats causing the problems..... i guess im just having a hard time going against the CS! :-/
Does anyone live near Dudley who has a known working CS who wouldnt mind me coming and trying it?
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How much of a wounder is it when you buy a part then it could still be that at fault? Hehe i have phoned Vaux up and they can do it me for £46 which i dont thinks a bad price, but they only list 1 type, and i know of 2!
Im gonna re-do my induction also just to make sure there are no leaks or anything but it just doesnt seem to justify a leak thats causing the problems..... i guess im just having a hard time going against the CS! :-/
Does anyone live near Dudley who has a known working CS who wouldnt mind me coming and trying it?
as its the wiring that often causes the issues, swapping out a good unit, may cause premature failure.
there is aguide here on a different cable routing.....behind the abs pipes, which keeps the cable a lot cooler.
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I have no ABS pipes to hide by :) hehe it goes away from the manifold and up towards the wing away from any heat source. Is there anything else that it should be kept away from?
Also just before i bite the bullet, if it is the crank sensor why does the car run better with the MAF unplugged?
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An outside bet would be a blocked exhaust, quite hard to detect and has a major effect.
Otherwise an air leak somewhere on the intake side?
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An outside bet would be a blocked exhaust, quite hard to detect and has a major effect.
Otherwise an air leak somewhere on the intake side?
Thats a new one exhaust blockage might try that! Intake air leaks i want to make double sure i have no leaks i just need to find some more piping
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Also if it was air leak or exhaust blockage wouldnt it happen all the way through the rev range?
Its only happening mid range say around 2-3k and on mid throttle, underload.
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Car really playing up today, almost undriveable! Should have the crank sensor Tuesday, still not very optimistic of the fix but who knows, if anyone and thats you guys!
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crank sensor can through all sorts of codes, only for them to vanish once new sensor fitted. You may have a maf issue but fit crank sensor first and see if that sorts it all out. If the ecu does not know the crank position then all electronic timing goes to pot.
See how you go.
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crank sensor can through all sorts of codes, only for them to vanish once new sensor fitted. You may have a maf issue but fit crank sensor first and see if that sorts it all out. If the ecu does not know the crank position then all electronic timing goes to pot.
See how you go.
Thanks mate, will see what happens Tuesday! I've tried 3 different MAF's and its always the same story.
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Morning! Vauxhall will have my sensor 3pm today, will pick up after work and take it from there. Price has goneup quite a lot when i told them there is defo at least 3 different types..... mine just happens to be a dear one!
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fingers crossed it will solve your probs :y
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Same problem here still! changed crank sensor genuine VX. changed blocked cat, still running 'dog rough' >:(
Kevin is going to tech 2 it tonight for me, I'll let you know what it picks up. :y
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Yeah let me know mate please mate but................. Mine seems ok!!!!!!! Thanks guys so so much!! Not gonna count my chickens too early will see how it goes after a few miles! Just flashed the codes and still have 73 & 19 for some reason!
Would love to still get the car checked on live data with tech2 or otherwise but i have it running through the old vaux 10pin diag plug
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Bloody thing!!!!
Car has done little more than 50miles now and the cars started misfiring & spluttering again! What the......?
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I know you say you've been careful, but check the wiring again.
Seen a simular problem on another car, changed CS and two days later the problem re-appeared. Checked the wiring and the wire had melted. Re-soldered wire, re-routed wire, ran fine afterwards.
I know it's mentioned already above, but worth mentioning again.
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OK, as said by PM, get it on live data. Also might be worth clearing the fault codes and seeing what comes back, and also resettign the BLM for idle and lamdas.
Get a 16pin obdii style plug temporarily wired up, doesn't need to be permement. Any obdii plug will do, be it from vx, vag, rover, whatever
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there are 10-16 pin adaptors on ebay, not sure if they would work for this though :-/
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there are 10-16 pin adaptors on ebay, not sure if they would work for this though :-/
cheaper to go down scrappy and cut one from a audi/rover/astra-g etc
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I like the sound of the adaptor if there is one that works! Im not the most gifted with electricals (colour blind) what would i have to do to wire up a new plug?
That it?: http://cgi.ebay.co.uk/10pin-to-obd-2-Adaptor-Scan-Cable-for-Vauxhall-10-Pin_W0QQitemZ290328600381QQcmdZViewItemQQptZUK_Diagnostic_Tools_Equipment?hash=item4398eedf3d&_trksid=p3911.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1683%7C293%3A1%7C294%3A50
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Also i only noticed it yesterday, if i leave the key turned in the car ready to start while doing something (i was writing a bday card in a car park) the car will not idle! Say if the keys left for 2-3mins
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I like the sound of the adaptor if there is one that works! Im not the most gifted with electricals (colour blind) what would i have to do to wire up a new plug?
That it?: http://cgi.ebay.co.uk/10pin-to-obd-2-Adaptor-Scan-Cable-for-Vauxhall-10-Pin_W0QQitemZ290328600381QQcmdZViewItemQQptZUK_Diagnostic_Tools_Equipment?hash=item4398eedf3d&_trksid=p3911.c0.m14&_trkparms=65%3A12%7C66%3A2%7C39%3A1%7C72%3A1683%7C293%3A1%7C294%3A50
yup, few similar on there, but thats the one that caught my eye :y
I expect that would do what you need it to (with a code reader of course)
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i know this might not have any effect but when was the last time you cleaned out your breather hoses and banyon?
if they are blocked it can contribute heavily to your problem. ( i use a kebab sequer to push through my small breather to get as much of the shite out as possible and the best thing to clean out the banyon is a 1.6mm drill bit.)
good luck in finding your fault.
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i know this might not have any effect but when was the last time you cleaned out your breather hoses and banyon?
if they are blocked it can contribute heavily to your problem. ( i use a kebab sequer to push through my small breather to get as much of the shite out as possible and the best thing to clean out the banyon is a 1.6mm drill bit.)
good luck in finding your fault.
We talking about the breather box underneath the intake system?
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I did give the breather box a checking over and its clear. Now not getting any fault codes flashing out at all but still getting problems. If its left there to idle, the idle gradually starts to get crazy thats when you know trying to drive its going to be just as bad. The worst of it is now just pulling away,under load then will clear as you reach the top end of the rev range. Hoping to get some live data from it shortly see whats going on.
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Any update on this?
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Sorry, I was only on page 1!!!
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just one thing, unplug the air intake sensor and see what happens. I had a similar prob and the engine ran better iv'e ordered a new sensor and maf. maybe that will fix it, Alo I had a senny that ran horrible, I changed every thing but the engine, the i noticed a wig sticking out of my exhaust, i showed it to my local parts shop and he said that the exhaust back box had collapsed. I changed it and and all my probs were solved. So the suggestion already made earlier may be the answer. :)
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Sorry the air intake temp sensor. :-[
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Sorry the air intake temp sensor. :-[
Last month if i unplugged the MAF the car would run better but the misfire was still there, this month i change the CS again and its perfect for a short while then back to normal! It seems i change a part or unplug something it tricks me into thinking that was the problem..... then laughs its balls off as it turns nasty again!
I've tried 3 different MAF's and its always the same, runs ok for a short while then back to normal, the air intake sensor ws a bodge job sealed into an induction pipe but now i have sourced the original pipe that seats up to the MAF. So its had 2 different ATS' also! Willing to give it ago by unplugging mind, although if past performances are anything to go by it will work great untill tomorrow! hehe
A duff exhaust system could also be the problem then? Pretty certain nothing before the flexi is adrift, it's de-cat'd btw also.