red warning light

"Injection system malfunction", generally means low fuel pressure. Replacing the fuel filter is the first and cheapest option to try. If that does not help then fuel pump would be next.

That approach could work out to be very expensive. Get it to a FIat garage and let them hook it up to their diagnostic kit; it will normally pinpoint he problem straight away. Far better than changing components one by one until you find the problem.

Andy

What a naive, simplistic and brainwashed point of view clearly showing total engineering ineptitude. Car garages must love you.

im assuming this is a 903cc cinq and not a cinq sporting. it is indeed as Alien Zord said the fuel injection light, however this does not mean low fuel pressure as Alien Zord wrongly said taking it to a garage would be the best/cheepest thing too do.

903's dont break down very offten so i cant really guess what it could be. hope that helps.

If you haven't got a clue what it is how can you say that I'm wrong?

there is no way for the engine ecu on this injection system too tell what the fuel pressure is, its all pre set. For the ecu too put up the warning light on, one the sensors would be detected as faulty by the ecu, ie oc, sc or value outside of specified limits. a blocked fuel filter or faulty fuel pump could not do this. some likly candidates for putting up this light with rough running are the lambda sensor(most likly) coolant temp sensor, or map sensor. however there is very little point it guessing what it could be, 1 min on the diagnostic machine at your local dealer will tell you exactly what to change.

I would disagree strongly with your comments Alien Zord and maybe respond by saying car parts dealers must love you as it would appear that your engineering aptitude would be along the approach of change everything until the fault disappears. Modern engineering concentrates on using technology to address the root cause of the failure; the only downside to this being that many garage mechanics cannot see past the diagnostic tester. Seeing as most home mechanics do not have diagnostic software at their disposal then the dealership needs to perform the diagnostic, in many cases the vehicle may need to be hooked up to the computer anyway to clear any fault codes from the ECU post repair (depends if warning lamp illuminates due to detected fault or ECU logged fault). Just because the garage has diagnosed the problem doesn't mean they have to fix it but the home mechanic can now make informed purchases of the exact parts required.

Andy

this is a great post, and this bit. "many garage mechanics cannot see past the diagnostic tester" i see this all the time, technicians becoming fitters. i was trained too allways take the diagnostics tool diagnosis with a pinch of salt :)

I am sure you were but I had my last car at a dealership garage and it would not start; they pushed it into the workshop and hooked it up to the diagnostic and the mechanic reported there was nothing wrong with it - yet it still wouldn't start!!!!!!!!!!

Andy

maybe you had the garage grease monkey working on your car :) just unlucky i guess.