Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Sazzaa on 20 January 2012, 20:35:03
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Omega 2.5 CD V6 (2000) kept seeming like it was going to cut out while driving/breaking and at the same time has lost power accelerating, doesn't want to go above 3000 rpm.... So I got the idling problem seen to (dodgy valve) but the acceleration is still gash. Garage have done a full service (it was overdue) and told me there could be a few things wrong with it, possibly serious, but to drive it a couple hundred miles and see if anything obvious crops up... Any ideas?
I'm female, and not mechanical, so be gentle with the tech speak please :)
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Hi is the spanner light on on the dash, may have a sensor gone, so would need to read the codes stored, look at paper clip in maintenance guide. should help you.
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There are no lights coming up on the dash at all...
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There are no lights coming up on the dash at all...
still do the paper clip it shows you how to doit see if any codes come up.
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Ok, will try this in the morning
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Ok, will try this in the morning
can go from there to find fault..
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When you switch the ignition on, without starting the engine ... do the "spanner" light and the one that looks like an engine, both come on and then go out ???
If not, possibly someone has removed the bulb to mask a fault ... not an unheard of practice .. :(
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When you switch the ignition on, without starting the engine ... do the "spanner" light and the one that looks like an engine, both come on and then go out ???
If not, possibly someone has removed the bulb to mask a fault ... not an unheard of practice .. :(
Not on a 2.5 Nige ;)
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When you switch the ignition on, without starting the engine ... do the "spanner" light and the one that looks like an engine, both come on and then go out ???
If not, possibly someone has removed the bulb to mask a fault ... not an unheard of practice .. :(
Not on a 2.5 Nige ;)
OK .. long time since I owned a 2.5 ... but the principle is right .. do the warning lights work as designed .. :)
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Ok, done the paperclip test..... Comes up with 73 and 31. So thats Mass Airflow Sensor Voltage Low and No Engine RPM Signal, right?
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Ok, done the paperclip test..... Comes up with 73 and 31. So thats Mass Airflow Sensor Voltage Low and No Engine RPM Signal, right?
no signal is cos engine not running, mass airflow sensor is on the air intake black round bit with square top check the plug is clean. inside and outter.if is do test again without it pluged in.
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Sazzaa, hello and welcome.
First of all, sack your mechanic. ''Run it for 200 miles and see what happens''??? WTF?
I am no mechanic, but a loss of power and acceleration... misfire perhaps???
If I were you I'd enlist the services of one of the legends on here to diagnose and repair!
Just my opinion! :)
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If the mass airflow sensor is suspected, unplug the electrical connector and see if the car runs better.It will go to a default setting when disconnected,and not be as pokey as it should be,but run reasonably ok. If it runs better with it unplugged you need to replace it.
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Sazzaa, hello and welcome.
First of all, sack your mechanic. ''Run it for 200 miles and see what happens''??? WTF?
I am no mechanic, but a loss of power and acceleration... misfire perhaps???
If I were you I'd enlist the services of one of the legends on here to diagnose and repair!
Just my opinion! :)
Ha, I can't blame the mechanic fully, I think he was trying to save me paying a huge bill all at once! (I'd mentioned I didn't have more than a couple hundred to spare at the moment and am heading on holiday in 2 weeks...)
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drive it a couple hundred miles and see if anything obvious crops up...
Missed that bit :-X
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Sazzaa, hello and welcome.
First of all, sack your mechanic. ''Run it for 200 miles and see what happens''??? WTF?
I am no mechanic, but a loss of power and acceleration... misfire perhaps???
If I were you I'd enlist the services of one of the legends on here to diagnose and repair!
Just my opinion! :)
Ha, I can't blame the mechanic fully, I think he was trying to save me paying a huge bill all at once! (I'd mentioned I didn't have more than a couple hundred to spare at the moment and am heading on holiday in 2 weeks...)
Fair enough but I'd expect a diagnosis!
As I said get someone on here to do it. Expert advice! :y
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Ok, done the paperclip test..... Comes up with 73 and 31. So thats Mass Airflow Sensor Voltage Low and No Engine RPM Signal, right?
no signal is cos engine not running, mass airflow sensor is on the air intake black round bit with square top check the plug is clean. inside and outter.if is do test again without it pluged in.
Erm, I don't know what I'm unplugging, or which bit the air intake is.... Pics would help!
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Front of engine bay,drivers side.The electrical plug you need to unplug is the one with yellow tape on it in the photo.
If the car runs quite a lot better with this unplugged,then it would be advisable to replace the part its plugged into.Its attached with a couple of large jubilee clips so if you need to replace it the only tool you should need is a flat blade screwdriver. :y
(http://i1238.photobucket.com/albums/ff500/Albs59/DSCF1289.jpg)
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Pic is a huge help, thanks! But I've just tried to remove the plug and it's not budging at all...
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Make sure you push the securing clip in all the way. It should come out relatively easily once this is done. :y
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Finally got the thing unplugged, the car runs a little better without it plugged in but it's not a massively noticeable difference... Still doesn't have power but the gears seem to be less confused (feels like gears just don't want to change when it's plugged in), car is smelling of burning a bit every time I drive it and idling is still low and pretty rough.
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Have ordered this, and have my fingers crossed that it works....
http://www.eurocarparts.com/ecp/c/Vauxhall_Omega_2.5_2000/p/car-parts/engine-parts/fuel-and-engine-management/engine-management-sensor/?434880011&1&8fbfcd4058d8ae422e52d6d89b2fe1a674c71df7&000009
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Have ordered this, and have my fingers crossed that it works....
http://www.eurocarparts.com/ecp/c/Vauxhall_Omega_2.5_2000/p/car-parts/engine-parts/fuel-and-engine-management/engine-management-sensor/?434880011&1&8fbfcd4058d8ae422e52d6d89b2fe1a674c71df7&000009
If you had got admin to post a "wanted" ad for you I had a genuine MAF suitable for you ;)
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How much? The one on the car just now is a Bosch...
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How much? The one on the car just now is a Bosch...
Would have been half of what you paid :(
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How much? The one on the car just now is a Bosch...
Would have been half of what you paid :(
See above link, I didn't order a Bosch, got a copy one with discount so was only £22.50
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How much? The one on the car just now is a Bosch...
Would have been half of what you paid :(
See above link, I didn't order a Bosch, got a copy one with discount so was only £22.50
Mine was ;)
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Ahhhhh. Should have said earlier then!!
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Ahhhhh. Should have said earlier then!!
Uhh, the word "genuine" in reply #22 ::)
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Erm, what I meant was, you should have said before I went and purchased something....... Christ this is hard work on here! And what's with the overuse of smilies on this board? ;D
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So, I bought a air flow meter which didn't fit, put the old one back on and my car broke down after about 30 seconds of driving it. Unplugged the oppser and got the car started again.... then went and bought a Bosch one from a dismantlers, fitted that and the car can't seem to make its mind up whether it wants to work or not. Read the fault codes again and am now getting 73 - Mass Air Flow Sensor Voltage Low and 74 - Mass Air Flow Sensor Voltage High. The car is running better but the idling is still pish, it wants to die every time I'm at a junction or roundabout. What can I try next?
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Anyone?
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Think I'm getting this thing scrapped. If anyone wants it give me a shout.
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Finally got the thing unplugged, the car runs a little better without it plugged in but it's not a massively noticeable difference... Still doesn't have power but the gears seem to be less confused (feels like gears just don't want to change when it's plugged in), car is smelling of burning a bit every time I drive it and idling is still low and pretty rough.
you may have a couple of problems.. and the smell reminds me oil in plug wells .. so check it..
also , if you ask my opinion before scrapping the car , try to visit a close member from here and let him see the car..
probably you have few issues and also OOF mobile mechanics here can help you .. :y
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I'm in Aberdeen, probably a bit far for anyone on here!
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I'm in Aberdeen, probably a bit far for anyone on here!
bad news :-\ as I said check the plug wells for oil..
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The maf on the 2.5 is fairly reliable. The voltage high might suggest a wiring issue to the maf itself, if so a new/other maf won't help.
Check the plug is seated correctly, no corrosion on the pins or similar. No wiring damage. Etc...?
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Also if you pm hotel21 on here he can plug tech2 in and take a closer look.
Don't scrap it for a poxy maf fault.