Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: eddie on 16 September 2008, 16:18:18
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Just skinned my knuckles chainging no.6 plug hoping it woul;d cure very uneven tickover and a definate thrummy engine note when accelerating. Stinks of unburnt fuel too.
Reason for changing no.6? Last time I changed plugs I left no.6 till last and it so bloody awkward to get at......... [smiley=embarassed.gif]
ANyhow,all plugs have now been done but mis-fire still present.
I will do paper clip test (good video how to) and get back.
In the meantime,which is the correct dis-pack for a '99 2.5L.
The ones at the vauxhall parts centre all end at '98 ??
eddie
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Eddie what were the HT leads like?
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Paper clip test only gave 12 and 13(open circuit lambda sensor??).
james....Ignition leads,not sure what you are driving at? They seemed to be ok visually,they haven't been touched for about 3 years.
I should also mention that as well as fuel pong there is also a very strong 'catalytic convertor pong'.
I dont see that a lambda sensor fault would cause one pot to misfire??
Strong leanings towards naffed dis-pack--given the amount of rain we've had in recent months :-[
Anyone advise as to which is the correct dis-pack for a 1999 model 2.5l?
eddie
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Try pulling the leads off the plugs one by one while it's running . If you loosen them on the plugs first it's easier and use something insulated like wooden or plastic tongs !! The lead you pull off that doesn't change the engine note is the problem cylinder. If you swap the lead on that plug for one of the others(I mean swap the whole lead from end to end , you have to pick one about the same length), the misfire should move to that cylinder if it's the lead that's the problem. If you've still got the misfire on the original problem cylinder , then it's either the spark pack or something wrong in the cylinder itself. Could also be an injector but if it stinks of fuel it's unlikely, Hope this makes sense it's easier to do than describe !
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On a 4 cylinder engine,rearranging the plug leads is fairly easy! On the v6 its nigh on impossible due to the amount of dismantling involved to get at the leads.
As it stands at the moment I can't identify which one is missing anyway!
Anyone know which dis-pack for a '99 model--semi face lift with audio controls on steering wheel.
eddie
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I started clearing the way for removing DIS pack today, removed the wiper mechanism cover etc. wiper mechanism itself is all disconnected but a bugger to manouver out!
I can see the top of the DIS pack and it looks in good shape,but looks aint everything.
I,ve realised that the so called code 13 I read on the flash test was in fact code 30 (normal)--so there are no flash codes of any use stored.
Before I start stripping my skin of, are there any other possible causes to a misfire and a very strong pong of unburnt fuel--dis pack,leads and or plugs all taken into account--the misfire is continuous, not intermittent.
Before I go any further I will renew plugs and give it one more try before ripping the DIS out.
eddie
P.S. Just remembered, when driving (I stopped using it now) the fuel consumption never went above 20mpg.
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re-did the paper clip test and I have come to the conclusion that codes I am getting are 31(expected--no rpm) and 21(!),the latter being a highTPS (Throttle position sensor voltage high).
Given the rough running and unburnt fuel smell could this mean that the high TPS voltage is causing too much juice to be injected??
Getting a bit flustered now. :-/
eddie
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not many replys for the newbie guys, but as said i would check those leads as well. Might be worth a call to vx with your reg and get the part no. For the dis pack from them, if you need it, as it sounds like you have a mini face lift which is not straight forward.
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ps also helps if your profile is filled in with your location and as much car/engine info as pos.
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.... Might be worth a call to vx with your reg and get the part no. For the dis pack from them, if you need it, as it sounds like you have a mini face lift which is not straight forward.
Vauxhall can not tell you which DIS pack you need even with reg or VIN number. The only way they know which one you have is when you put the old one on the parts desk with bloodied hands! ;) :y
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dis pac will be the oval plug type matey ! check your plugs again had one snapped in half the other day !! :o
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I,ve seen my DIS Pack! :D
Mounted horizontally on a bracket with a connector on top at one end.
At the mo, I'm struggling with the wiper arm assembley. All retention screws are removed and rattling around in its own little world--trouble is the spigot supporting the motor end is too bloody long and I cant get clearance to remove it. :-/
One useless little thought,has anyone done a static resistance test on a coil pack. Put meter across opposing pairs of leads and read of the resistance. It will surely vary due to the difference in lead lengths but any faults should show either open circuit or disproportionately high.
Any one have a coil pack and leads on the bench at the mo'?
eddie
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I,ve seen my DIS Pack! :D
Mounted horizontally on a bracket with a connector on top at one end.
At the mo, I'm struggling with the wiper arm assembley. All retention screws are removed and rattling around in its own little world--trouble is the spigot supporting the motor end is too bloody long and I cant get clearance to remove it. :-/
One useless little thought,has anyone done a static resistance test on a coil pack. Put meter across opposing pairs of leads and read of the resistance. It will surely vary due to the difference in lead lengths but any faults should show either open circuit or disproportionately high.
Any one have a coil pack and leads on the bench at the mo'?
eddie
Yep
Leads - 2-10K ohm
DIS secondary - 8Kohm
DIS Primary - 2-4ohm
You dont need to remove the wiper motor assembly to get the DIS pack out!
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Sheesh! where'd that come from............ :D
Thanks Mark-time to dig out the meter and look technical,doesnt 'alf impress 'the boss'.
So if I pull the connectors on plugs 2 and 5 I 'should' get between 12k and 18k between them. By primary I take it you mean the connector from ECU.
One good thing with this dismantling lark it gives a chance to clean up some of the hidden grotty bits.
eddie
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Sheesh! where'd that come from............ :D
Thanks Mark-time to dig out the meter and look technical,doesnt 'alf impress 'the boss'.
eddie
Do be aware that you also need to check the DIS pack condition because if the iron core is rusted and damaged then this will impact on the spark voltage without affecting the resistance.
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I'll have to remove an eye ball and tuck it in there then.
Point taken mark. Time to bite the bullet and loose a bit more skin then.
eddie
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At last,finally removed intake plenum etc.
Did a static resistance test across matching pairs of leads,still connected via coil pack. Each pair came up 20k to 22k ohms,would seem the coil pack is ok in that respect,I'll wheedle it out anyway and check its general condition.
My mind keeps going back to the code 13 (o2 sensor 1 open loop) I got with the paper clip check,could this cause the problem I am having,misfiring and strong fuel smell?
I assume sensor 1 is drivers side?
eddie
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Finally got the coil pack out--had remove wiper assembly bolts to get that extra 1/8" clearance.
Looking at the pack it looks to be in good nick,no bulging or splitting anywhere.
There are some small 2mm-3mm holes on the underside through which I can see what I take to be the laminations of the coils or a screening can,these are slightly rusty in colour.
Ive done a static resistance check and I get about 18K across each pair of coils.
The primary circuits are all reading about 1ohm.
Leads are all good as far as I can tell, various resistances but nothing ridiculously high or low.
Its either clean everything up and put it back or get a new pack anyhows.
Anything else need checking?
eddie
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Finally got the coil pack out--had remove wiper assembly bolts to get that extra 1/8" clearance.
Looking at the pack it looks to be in good nick,no bulging or splitting anywhere.
There are some small 2mm-3mm holes on the underside through which I can see what I take to be the laminations of the coils or a screening can,these are slightly rusty in colour.
Ive done a static resistance check and I get about 18K across each pair of coils.
The primary circuits are all reading about 1ohm.
Leads are all good as far as I can tell, various resistances but nothing ridiculously high or low.
Its either clean everything up and put it back or get a new pack anyhows.
Anything else need checking?
eddie
May have said before but, check the plug insulators for signs of tracking and clean them with Jif (Cif) or a green scouring pad.
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Better still,I'll chuck new ones in.(Damn the expense) >:(
All the connectors look clean and are a good tight fit.
Can things like knock sensors cause misfiring?
eddie
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Better still,I'll chuck new ones in.(darn the expense) >:(
All the connectors look clean and are a good tight fit.
Can things like knock sensors cause misfiring?
eddie
Nope.
Knock snsors and lambdas rarely cause a miss, loss of power or increased consumption maybe.
Can you do a vac test on the engine with gearbox in neutral, warmed up and aircon etc off.
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I did all of the above when I had a mis-fire. Turned out to be 1 single lead. I only spotted it by chance when I saw it chucking out a sideways spark from the connector at the dis pack end.
Had I did just a visual check of leads I still would not have found it as it was split under the L-shape connector.
Worth a new set of leads as opposed to replacing a non faulty dis pack.
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Phate321:- Had you done any work on the car prior to this, you know,something to have caused the split or was it spontaneous?
Just to recap-my symptoms, very rough running/misfiring, strong unburnt fuel smell (initially accompanied with the bad eggs pong from convertor), fuel consumption on the run never going above 20 mpg.
No loss of oil or coolant.
Mark:- 'fraid I dont have the gear to do a vacuum test :-/
eddie
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Fitted new coil pack Saturday afternoon,purring like a kitten.
Also took the opportunity to clean breathers and throttle body etc.Running better than when I first bought it.
Took a 10 mile detour at 3am on way home from work just for the fun of it! :y
My sincere thanks to all for advice and encouragement.
eddie