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@ I’m having problems with my 1997 Astra 2.0 16v Sport and hope you can help. It keeps bringing the management light on and when it does, it becomes very erratic to drive and also it’s hard to start – it seems to crank over for a long time then will eventually catch. It’s just been serviced with new plugs, leads and all the filters and I’ve also had the throttle body and idle value cleaned out. I’ve been told to get the ECU read for faults but nobody seems to be able to plug into the car as it’s the old type of plug – though I’m not actually sure what that means. I don’t know if it makes a difference but I’ve just fitted a Lexmaul manifold, a stainless exhaust and a cone filter. Brad.
AThe first port of call for any management light related issue is to check the fault codes stored in the ECU. From the late 90s, all cars were OBDII, which means they had a common multi-plug design and all give generic codes. The likes of the Calibra, Mk3 Astra, Cavalier and so on are OBDI – they can still be read but the multiplug is a different shape and due to their age now, very few people still have access to these code readers. Vauxhall used Tech 1 (Tech 2 is for later, OBDII cars) but these are few and far between. You can read the codes though, it’s a case of bridging out two pins on the diagnostic port multi-plug, this then flashes the management light
PERFORMANCE VAUXHALL in sequences to tell you what fault code is stored. There’s loads of info online and guides on how to do this so get reading.
Once you have your code/s then this will give you the area in which the issue lies but remember, they are just guidelines so don’t always assume if it says “Air flow mismatch” it’s the air flow meter, it merely means there is something causing the air flow meter to send a fault – could be the meter, could be an air leak, could be wiring. In your case, we’d be very surprised if it wasn’t camshaft or crankshaft sensor related. Both are prone to failure but again just check the wiring for damage, make sure the sensors aren’t loose and that the multi-plugs are clean and corrosion free. Both sensors are inexpensive and readily available but just ensure you get the correct one as there are several variations on the Ecotec engine – it’s not one size fits all despite the engine being the same in several models. Given you’ve just fitted a manifold, we’d double check you haven’t caught, trapped or damaged the crank sensor wiring down the front of the block as it can get very fragile with age and doesn’t take too kindly to rough handling. Worth checking first?
Reading fault codes with OBDI equipped cars can be a little tricky