Injectors overhaul

[Martin Mc]

Reading around various threads and the dreaded Haynes book of despair, it sounds like stripping down and checking the fuel injection system and associated wiring should be a relatively straightforward job. However, standing at the front of the car, looking into the engine bay, it doesn't look to me as if the fuel systems are accessible at all.

So, I was wondering if anyone had tackled this aspect of the engine, and if there were any tips for getting started in checking injectors and wiring.

I'm currently at Catch 22 with the car - it runs roughly and appears to be misfiring, with sooty exhaust even when warm. I've replaced plugs, HT leads, distributor cap and rotor, all without any change to the rough running. I can't put it in for MOT until it runs somewhat better, as it will just fail, so I want to do as much as possible myself to try and cure the problem before resorting to garage intervention.

Thanks in anticipation

Martin

[ChrisDK]

Not sure it's any help, I had a similar problem and the cure was a new MAF (the air flow sensor) and a new air tight rubber hose (i'm unsure of the technical term), the one that connects the air filter to the throttle body.

[Martin Mc]

Cheers Chris for your insights - it looks like my engine is a B18FP unit, which (luckily?) doesn't have a MAF, EGR or other complex gubbins attached:)

Had the air pressure sensor off this afternoon, and noticed an immediate difference to the running of the car. On starting, prior to disconnecting, the same (usual) lumpiness and rich running was evident, but as soon as the air pressure sensor was disconnected, the idle became smooth and regular and the misfire disappeared. Connecting the sensor back up again caused the engine to stall.

Is there any way to test the air pressure sensor to assess whether it is ok or failed? If so, what am I looking out for?

Cheers!

Martin