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Thread: Misfire under load. 2003 1.8 DuelFuel.

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    Default Misfire under load. 2003 1.8 DuelFuel.

    Hi, my Vectra seems to have a misfire when under load. By this I mean if I was driving at say 30mph in 4th gear, then try to accelerate, the engine would begin to stutter quite badly until I lift off the accelerator. The problem appears on both gas and petrol, and is also apparent with the engine both hot and cold.

    It didnít have much of a service history when I bought it. So far I have changed the oil + filter, air filter and the spark plugs and it has made no difference. (If anything, it might now be slightly worse)

    Any ideas?

    Also this is the 1st Vauxhall ive driven, so was wondering where the temp gauge should be at? On a motorway run, mine seems to sit at less than 80, around the 75 mark. Is this about right or should it be running a little hotter than this?

    Thanks

    Gavin

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    Hi Gavin,
    Firstly it's good that it does it on both fuels - that points you away from the LPG system.

    I haven't managed to find much technical data for these things so I haven't worked out how it all works - although I have run LPG for over 10 years so I do understand these systems.

    It could be the ignition system or one of the components that is common to both systems - air intake + components, exhaust, lambda, flywheel sensor etc etc. I THINK there are two ECU's - one for petrol and one for lpg - but I'm not sure. The system is so well integrated it took a little while to spot the injectors and vapouriser!!

    I would probably start with getting someone to read the fault codes. It'll cost a little but it could point you straight to the faulty component. Otherwise you'll just start replacing bits till you find the faulty one - which won't be the first you replace!

    I believe there are some fault code readers that you can buy for around the £100 mark - not mega cheap but at least you will have something to show for your cash!!

    I wouldn't worry too much about the temp - I think mine sits at about 80 unless in traffic when it creeps up to about 90. Change the thermostat if you're that bothered - I'd spend the pennies on the other problem first.

    Cheers
    Steve

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    Thanks Steve.
    I was thinking I might need to get a code reader. If there is a code stored should the engine management light not be lit on the dash? Or is this not necessarily the case. Actually upon checking my Vectra, I don't get the emissions control light on the dash when turning on the ignition, whereas according to the manual, it should momentarily light. Should this light upon switching on the ignition?

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    I'm not sure - any of the other petrol heads should be able to comment on that - our system operates the same as any other.

    It would be affected by whether or not it is a hard fault or intermittent. It could be that the fault only occurs under the conditions that you describe (I don't mean the misfire but whatever is causing it). Not very likely I admit but you never know.

    If mine develops a problem I will get a fault code reader.

    Keep us updated.

    Steve

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    The ignition coil pack could be a suspect with your problem, thing is they are around £100 so it's a bit expensive to try one and find it doesn't cure it !

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    Apart from the stuttering....(Doh!) how do you find your LPG Vec??
    I am Considering getting one next year as my workhorse....just want something nice/safe/comfy to drive that dosnt a fortune to run!

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    Coil pack, try a new one of those
    Now I need a turbo to keep up!

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    Apart from the stuttering (which is now REALLY bad on LPG) its fine. its costing 1/2 what my last car (2.5L V6) cost to run. Obviously its a massive performance loss compared to that, but i needed something cheaper to run. I get about 170miles @ 80mph to £13 worth of gas @ 52p/L. Though Ive been told that u can get it cheaper than this if you find a source not on a forecourt. One annoying thing is the gas tank is quite small, so although its cheap, you do have to fill it up quite often.

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    Quote Originally Posted by Gavin1977 View Post
    Apart from the stuttering (which is now REALLY bad on LPG) its fine. its costing 1/2 what my last car (2.5L V6) cost to run. Obviously its a massive performance loss compared to that, but i needed something cheaper to run. I get about 170miles @ 80mph to £13 worth of gas @ 52p/L. Though Ive been told that u can get it cheaper than this if you find a source not on a forecourt. One annoying thing is the gas tank is quite small, so although its cheap, you do have to fill it up quite often.

    Yeah, thats pretty cheap!
    It wouldn't be too much of a problem for me filling up... there is an LPG supplier about 400yds up the road from me!
    Thanks for that

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    Happy new year guys. Right i bought a code reader, but then a house move and christmas got in the way, so it wasnt until a couple of days ago that i managed to plug it into my kangaroo-ing vectra. It has come up with the following.

    1. P0203 Injector circuit open cylinder No. 3
    2. P0036 HO2S Bank1 Sens 2 Heater Circuit.

    I assume (1) is a wiring fault going to the injector, but can anyone shed any light on point (2) ?

    I have also found somebody with the same engine, so am going to try Big Sig's suggestion and swap the coilpacks to see if that does anything.

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