Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: perfferle on 28 February 2008, 22:37:52
-
Hi Guys,
Anyone know what would cause the engine to misfire during acceleratiion only? The idle is smooth and it runs at motorway+ speeds smooth - Just the acceleration sputters though :(...
P.
-
Crankshaft Sensor?? Dispack?? Air Leak??
-
Possible air leak!
Replaced aux drive belt last saturday. And I did remove throttle valve to 'clean' so mabey leaking on o'rings(?). Will remove again this coming weekend anyway to change s/plugs :y.
Thanks,
P.
-
when changing plugs look for oil in plug wells,if present that will take you down the route of blocked breathers,leaking cam cover gaskets,which cause damage to plugs/plug leads/dis pack. :y
-
doesn't missing under load point more to dis pack?
-
doesn't missing under load point more to dis pack?
Missfire under acceleration/load, but with good idle were the same symptoms I experienced when my DIS pack blew open (amazingly the car kept going though)...so DIS pack gets my vote! ;)
-
Well crankshaft sensor was more of an afterthought on the list...tbh thats more likely to limit revs if its failing/failed.
Dispack is most likely, air leak is possible but tbh I would have thought it would affect the full range, not just under load?? I'm pretty sure my car has an air leak (EGR or O rings) and it generally runs rough as well as hesitating sometimes under load...dispack isnt too bad to replace though, especially if you have the plenum off anyway...
-
Changing the HT leads cured mine of that.
Look for oil and heat damage at the plug end.
-
I have a decent set of v6 HT leads here if you need them...fair point I guess, if its the HT leads and hasnt damaged your dispack then great :) If its damaged it though then you will need both :(
-
Hi Chris,
Will tackle plugs as planned tomorrow. If fault not corrected then :( - Please let me know what cost for leads and dispack.
Thanks,
P.
-
i just changed my dis pack due to misfire when i got the old one out it had split all round. i paid £70 for a new one from centrals auto supplys
-
Hi Perfferle, I dont have a dispack for a 99 Omega I'm afraid...but I have the leads...do you still want the foglight mate?
-
Same symptoms for me, but I've had all the plugs done, and new leads on bank 2,4,6...
Still missing under acceleration though upto 4000rpm-ish tho, and hunts a bit randomly on very cold/damp starts, so my next step is getting a new coilpack on it to see if that sorts it out.
Although the HBV did give up last September, and its since then its all started to go wrong ;D
Don't really fancy raiding a scrappy for one as you can't trust how well it will last (if it works)
-
.....Although the HBV did give up last September, and its since then its all started to go wrong.....
I wonder did the water-spray/mist leaking from your HBV also kill the DIS pack; I`m sure I`ve read recent forum posts on just that topic. ;)
-
I had the same problem a few years back and it was the dispack that needed changing.
The garage were shocking. I eventually found the answer through the ABS forum and called the garage to let them know ::)
-
same problem here too but only apeared AFTER i had plugs and leads changed.... doubt very much if any "O" rings where changed on re-assemble from garage!
-
A misfire under load is often a weak spark.
I'd say HT leads are the favourite followed by DIS pack.
-
even if it happens only now and then? travelled 60 miles without a hitch then it started again for a few hundred yards then ok again???
-
Good point!
I replaced my HPV just a couple months ago and the leak at that time could have done some damage.
Then again, the leaking rocker covers could also have done in the plug leads.
Tomorrow is plenum off day to replace plugs as planned.
-
Damaged leads could then damage the dis pack, but may as well start with cheapest 1st...have the cover gaskets been changed now?
-
yes the 2 covers with gaskets where changed at the same time as plugs and leads.
-
what about the fuel filter?
-
fuel filter changed at same time too
-
Hi Guys,
Just to let you all know the result of Saturdat's attempt to change the plugs:
- the plugs & Leads were swimming in oil - so much so that I only removed one plug to inspect it (was ok), replaced the O'rings for the plenum and cleaned the breather. I will have to get all the bits to do the rocker cover gaskets and probibly replace the oil-soaked plug leads in the process.
Thanks for your help :y,
P.
-
If the gaskets were changed fairly recently and are already leaking badly...you seriously need to clean out the breathers and maybe the throttle body too...otherwise it will just keep happening :)
-
I would check plugs, leads, then DIS, in that order
When I once had a miss, I pulled a few leads, and they looked fine, so I Dismissed them,
It's only when Ronnie Mc B persuaded me to pull no. 6 lead, and I found it in 2 bits, that I found the problem ;D