vOLVO 240 Injection q

[xbo11ox]

Hey punks! Can anyone give me some help here? I am well stuck!

My volvo 240 died the other day due to a goosed alternator. I spent 2 hours in the curse word rain fitting a new one in my works car park. When I started it up, it all seemed OK and I disconnected the battery with the engine running. The engine still ran OK so I knew the alternator was providing the juice. Result! I was so jubilant I did it again like a tw@t. this time the enigne died and now it won't start again! I have checked and theres a nice fat spark, and it has a twistable dizzy which I have not touched so the timing must be right. That only leaves the fuelling, and it smells very 'petrolly' when cranking. I whipped the plugs out and sure enough they were wet with juice. I left em on my desk at work for a day to dry out. I also disconnected the injectors and cranked the engine over a bit with the plugs out to get rid of any excess juice in there. I left it all for a day to evaporate off, then chucked the plugs back in and tried again. Not even a cough! The plugs were soaked again straight away. WTF is going on?

I guess the easy answer is 'your ECU is fooked cos you disconnected the battery with the engine running' but what is the true likelihood of that happening? Theres no management light on or anything, the fuel pump buzzes up when you turn the key and the injectors are clearly doing something. How can I check the signal to the injectors and see if they're staying open too long? They seem to be delivering far too much juice.

The car is a '93 240 2.0 Torslanda with (I think) LH-Jetronic and a lambda control. Here it is towing some old clunkers:





While the volvo is off the road i am forced to travel about in this, which only does 60 mph and has crippling seats so I NEED HELP!



Many thanks!

[surprisingskoda]

i'd help, but when my BM and Skoda both died, i spent three weeks in a hyundai pony which had optional acceleration (not fitted) and an inability to pass 67mph.

so in three weeks, I will give you the answer

[scaryoldcortina]

if you have a multimeter that can read dwell, you can check the injector pulse width in the same way it can read points dwell. It does sound a bit rum to me... its theoretically possible you fried the ecu, and now the injectors are permanantly grounded (and therefore stuck "on" all the time) BUT I don't think thats too likely even if the injector coil could withstand it for long without burning out (and shutting off).

[phil withers]

What scary said, although it's very unlikely I managed to fry an ecu on my Mk2 digifant Golf by not putting the earth strap back on when I changed the gearbox.

Had me buggering around for ages but it just earthed all the injectors and fuel was going into the bores flat out all the time.

Very annoying but if you test at the injector plugs you should be able to see what is going on

[suterman]

Have you tried just resetting the ECU by disconnecting the battery for ten minutes or so then restarting?

Have you got any codes from the OBD? (passenger side just between the strut tower and bulkhead)

I have a spare 2.0 ECU if you want, £20. you can try it first if you want

[xbo11ox]

The plot thickens with this car. I have spent ages trying to get it going, but it simply will not run. The best I can get out of it is a few coughs and splutters, it will only do those with a nearly-flat battery, with a healthy battery it just wangs over and over without even a cough.

Having spent a few days trying to start it, I noticed after this mornings effort a brown liquid pizzing out from under the engine, it looks like oil but smells like petrol. It was still pi$$ing out 5 mins after i stopped cranking the engine. The dipstick appears to register nothing at all, despite me changing the oil just a fortnight ago. I can only assume the ECU is bolloxed and has just been permanently opening the injectors, with the result that the sump is now full of petrol and is overflowing from somewhere.

It looks like a I need a new ECU. Suterman, PM coming your way!