Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: buttsy19 on 31 January 2012, 17:40:35
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Can you help please,
i have recently purchased this car and knew that it had a few faults, so far i have cured the surging at idle by completely cleaning out all the breather hoses and stripping and cleaning the throttle body, she now idles as she should at startup around the 600 mark.
The rocker cover gasket was goosed as i had shed loads of oil in all the plug pots and dripping onto the exhaust from the half moons at the rear, so this was changed and all is now well.
Now before i did any of this work the engine light (not the one with the spanner) was lit so after i cleaned the throttle body out i checked the codes with a friend code reader and the codes were po340 cam sensor, p1700 mil on, po100 air flow meter and po170 fuel trim malfunction. Being the methodical person that i am i went for the easiest job first and changed the air flow meter for a one from ebay, had the codes cleared and the engine light reset by my friend and started the car only for the engine light to reappear, read the codes again and the same codes came back.
Here are my symptoms now sometimes the car will not start on the first turn of the key wether it be hot or cold, but this only happens sometimes, whilst i'm driving along sometimes the car has a tendancy to hang on to third gear for a while before engaging fourth and sometimes whilst driving downhill in fourth it will engage third and then jump back to fourth.
I have also noticed that when i am decelerating the instant mpg in the display never reads 999.9, appart from this these faults the car seems to drive ok and is currently giving me 31 mpg on my daily 50 mile round trip to work and back.
Any thoughts or suggestions would be welcome.
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Change rthe cam sensor for a genuine vauxhall one...when these go they often cause the extra codes you are seeing. Your old genuine maf was probably fine, so keep hold, may be a better bet than your pattern one
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Can you help please,
i have recently purchased this car and knew that it had a few faults, so far i have cured the surging at idle by completely cleaning out all the breather hoses and stripping and cleaning the throttle body, she now idles as she should at startup around the 600 mark.
The rocker cover gasket was goosed as i had shed loads of oil in all the plug pots and dripping onto the exhaust from the half moons at the rear, so this was changed and all is now well.
Now before i did any of this work the engine light (not the one with the spanner) was lit so after i cleaned the throttle body out i checked the codes with a friend code reader and the codes were po340 cam sensor, p1700 mil on, po100 air flow meter and po170 fuel trim malfunction. Being the methodical person that i am i went for the easiest job first and changed the air flow meter for a one from ebay, had the codes cleared and the engine light reset by my friend and started the car only for the engine light to reappear, read the codes again and the same codes came back.
Here are my symptoms now sometimes the car will not start on the first turn of the key wether it be hot or cold, but this only happens sometimes, whilst i'm driving along sometimes the car has a tendancy to hang on to third gear for a while before engaging fourth and sometimes whilst driving downhill in fourth it will engage third and then jump back to fourth.
I have also noticed that when i am decelerating the instant mpg in the display never reads 999.9, appart from this these faults the car seems to drive ok and is currently giving me 31 mpg on my daily 50 mile round trip to work and back.
Any thoughts or suggestions would be welcome.
Could be the cam sensor is on the way out.
If you change it, don't, repeat don't buy one anywhere other than from a Vauxhall dealer, or else you will be wasting your money.
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Cheers for the advise will change and report my findings back.
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If you think the car is driving OK now, you will be pleasantly surprised once you change that cam sensor and clear the codes!
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I could come and have a look for you if you want.
Live in North Tyne valley - work in Scotswood
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I could come and have a look for you if you want.
Live in North Tyne valley - work in Scotswood
Many thanks for the offer 2woody, i can confirm that i have changed the cam sensor for a genuine part as to my horror the old one was also a pattern part, and replaced the maf with a genuine part, the car started first time but i guess time will tell if she starts first time every time.
The engine light is still on (don't no if it supposed to be, i would have thought that changing the part would cure the fault and extinguish the lamp) or does it have to have the codes reset. I still have a problem with the auto box hanging onto gears but again it does not do it all the time.
2woody if you fancy a look up my neck of the woods just pm me and we'll meet up, it would be nice to get a fresh perspective on the car.
regards to all who have helped.
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I could come and have a look for you if you want.
Live in North Tyne valley - work in Scotswood
Many thanks for the offer 2woody, i can confirm that i have changed the cam sensor for a genuine part as to my horror the old one was also a pattern part, and replaced the maf with a genuine part, the car started first time but i guess time will tell if she starts first time every time.
The engine light is still on (don't no if it supposed to be, i would have thought that changing the part would cure the fault and extinguish the lamp) or does it have to have the codes reset. I still have a problem with the auto box hanging onto gears but again it does not do it all the time.
2woody if you fancy a look up my neck of the woods just pm me and we'll meet up, it would be nice to get a fresh perspective on the car.
regards to all who have helped.
Still registering a fault
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Thanks RobG i'll have the codes read tomorrow from a mate at work who has a code reader and will report back.
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The continuing saga,
Bought an elm 327 usb interface reader to use with my lappy and some obd2 software, plugged it into the miggy's obd port and nada, software tries to connect and tells me in cannot connect to the cars ecu, tried different settings com port changes, baud rate changes but to no avail.
On a side note it will connect to my 2011 mini cooper no problems at all, but i don't have any problems with that car.
Anyone have a one of these cables, who may shed some light as to what i may be doing wrong.
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Some cars can be picky about what they'll talk to. I'd get the battery unhooked for half an hour or so to clear any codes stored and go from there. Sometimes it'll keep the light lit for a certain amount of engine starts before it goes out.
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Ok so iv'e bought myself an autel maxiscan and read the codes they are p0100 and p1700 p.
I have already replaced the airflow meter with a genuine vx one and checked for the correct voltages which are present, now when i erase the codes the p0100 code will not show again untill a few restarts later, so having eliminated the electrical side would i be correct in thinking that i may have an air leak somewhere after the airflow meter, the p1700 p is always there i suspect that this is a transmission fault from the tcu that has activated the mil via the ecu, but i have no way of reading the tcu codes.
Could anyone shed some more light on this please.
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ive found on my 2.2 auto if either of the engine management lights comes on due to a faulty component,i have had to reset using the code reader once the faulty component has been replaced
as ive found,maf,cam sensor and crankshaft sensor have all worn out gradually,leading to the gearbox holding on to each gear for longer than required.
the crankshaft sensor has been on its way out for the last 5 to 6 weeks,5 times it didnt start first turn of the key,gearbox started to hold on to gears for longer,eventually engine management light came on showing p0335,swopped it for a new genuine gm one,reset it and now the gearchanges are back to how they used to be...car drives lovely again..
also,when going down hill for a long period,mine changes into 3rd to use as an engine brake,its normal... :)
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Hi ndmv6,
Mine also suffers from hanging onto second gear for a long time, and to get it into third i have to ease off the gas then it changes up.
to see if i can cure this p0100 fault i may have to replace the maf again, maybe the last one was a duff unit. hopefull that may also cure the p1700 p fault that i have been experiencing.
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hello again,well ,the maf may still be the problem,also the crankshaft sensor may also be on its way out as you have mentioned that sometimes it wont start first turn of the key...
my car started quite happily with a faulty maf.
also started happily when it had a faulty cam sensor...
hth... :)
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Done a bit more diagnostics today belling out the wiring from the maf to the ecu checking voltages, and it would seem that one of my previous posts was incorrect when i stated that i had the correct voltages whilst checking pins 2 and 3 on the multi plug from the maf.
According to autodate the voltage should read 1.1 volts across pins 2/3 at idle and upwards of 3 volts as i accelerate in line with how much air flow enters the meter, mine unfortunately reads .4 of a volt at idle and .85 as i increase acceleration.
I'm guessing this means a duff maf and the reason why the mil lamp is lit, tried cleaning it with cfc computer screen spray but still the same readings after.
Sorry for my ramblings but i like to no how things work or how they are supposed to work before i go spending hard earned cash again.
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Update.
Installed a genuine seimens unit supplied via company on ebay and result, engine management light out and has not reappeared in over ten starts, car drives superbly and no hesitation in gear changes, it feels more responsive and a lot more refined.
All of the codes i was seeing before have now disappeared including the p1700 p code, all i can say is she is a totally different animal to what she was before.
Many thanks to all who have helped and pointed me in the correct direction.