Vauxhall Corsa : The Engine Management Light Mystery
For the condenced version, scroll down to the bottom :-p
Going back about three and a half years ago, I bought a 1.2 petrol Vauxhall Corsa SXI+, second hand, 56 plate with 9k miles on the clock.
It has done me very well over the past few years, I've done about 50k miles in it since I had it, so now the clock is up to 60k miles. The only thing I've ever had to do is get a new engine - I know this is a big deal but it was my own fault, as I forgot to put oil in the thing
Anyway, going back a fortnight or so ago, I had a flat and since it was dark, decided to leave the car where it was and get a taxi home. I came back the following day, changed the tyre and as I went to leave, I realised the battery was dead, due to leaving my hazards on.
I had someone come out and jump start me, and the engine light came on. I was told the battery should recharge by the time I got home. I drove home barely, as the car seemed to be in limp mode.
The following day, the car started fine and seemed to have no problem but the engine light was still on, though I had no problems driving it this time. I topped the oil up (possibly over filling it slightly) and all was well.
On my way to work, as soon as the car hit 4k revs in 5th, so roughly 70mph, the car wouldn't stall but the engine light would flash and the engine would seem to pull back, so the car would slow down and it would be nigh on impossible for me to accelerate.
The only way to make a temporary solution to this would be to turn the engine off and back on, and I'd be able to accelerate as normal and continue without a problem as long as I stuck to about 60mph.
I took the car to the garage and the diagnostic kit said that the car was misfiring, though it wasn't. Only when I hit 4k revs and the power would reduce, after which it would be very hesitant whilst accelerating.
The car has been taken to the garage twice since then, has had cleaning fluid flushed through in case of dirt on the sensor but the problem persists and the guys at the garage have no idea why.
I was wondering if someone may have any idea as to the cause of these symptoms or may have had this problem themselves. Any help, advice or information provided would be greatly appreciated.
1.2L Vauxhall Corse SXI+
56 Plate, 3.5 years old, 60k miles on clock.
Engine Management Light on, diagnostic kit reads "missfireing", only symptom is the power decreasing when I hit 4k revs/ 70mph, and struggles to accelerate, judders slightly.
Temp solution is to turn engine off and on and stick to 60-65mph, cleaning fluid has been washed through to clean sensors, garage has no idea what it could be. Any info appreciated. Thanks!
Welcome to the site Sharkbait, has this problem been in existence ever since you fitted the new engine?
I think I read on another post in here, where someone had a similar problem, and it turned out to be the cylinder head gasket blown in between two cylinders, rather than to the outer edge, (if you know what I mean) good luck with it, I hope one of the gurus can solve it for you
When the car is 'hesitating', the computer (ECU) in the car is registering this as a misfire, probably due to too weak a mixture.
Really, this needs to go on a diagnostic scanner with a garage that understands whats going on here. In the live data menu on a good scanner you can see what each of the sensors is actually telling the ECU. Without that information, it is very hard to diagnose accurately.
If you take it back to your original garage, get them to check this info for the EGR valve, especially the feedback voltage (should be close to 1.0 volt), and for the short term fuel trim (0% alternating + or - by no more than 5%). If they don't understand, get them to read the value of the after catalyst lambda (oxygen) sensor, engine hot, and make sure the reading is fairly steady around 0.6 volts. If it is 0.1 volt then suspect the airflow sensor.
As for the 'cleaning fluid flushed through to clean the sensor', I cannot imagine what this means, other then 'we don't know what we are doing!!!'
Last edited by Hometune; 28-09-10 at 21:13.
Thanks for the welcome Smudger and no, I had the new engine put in about a year ago and I've only had this problem for about a fortnight. It was fine before then, hence my uncertainty at what has triggered the issue.
Hometune, thanks for all of the info mate, I have indeed been considering taking the car to the place I bought it, which is actually a Vauxhall dealership - I was reluctant to do this as I'm assuming big fee's, since the garage I have been taking it to is family run so it's usually fair, accurate and, for the most part, free.
Thanks again for the info, I'll pass it on...
How much is slightly over filled? If the battery was completely flat when you jump started the car you could have damaged the ECU.
Well, the oil hadn't been filled for a while and so I basically just tipped a full bottle thingy in. Which was about a litre or so, I think.
And when the car was jump started, it was done by someone who works for my breakdown recovery service, so it wasn't just some random botch job...
I've just had the same problem with my VW polo. The EPS light was on constantly and on one occassion I lost power and couldn't accerelate. I have just had a diagnostic run on it at my local garage, and it seems it might be the brake light switch. However these problems started after I had a new starter motor fitted back in July. I now wonder if I needed a new starter motor, or if it was all related to this sensor????
Also does anyone have any idea how much a diagnostic test and brake light switch will set me back??
Brake light switches are a common problem on VWs.
They cost around £15 from a dealer. The VW dealer charges about £60+vat in Wakefield but if you live near London it will be more. Maybe finding a garage specialising in diagnostics near you may be cheaper.
(The starter motor would not cause the EPS light to come on)
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