The troubles continous for my punto, every about 10 times I run the car the engine mangement light (injector warning) is coming up for about 10 seconds, after maybe 10-15 minutes. There is no reving, or judder or anything, the car is perfectly normal.

Since the car runs fine I guess its some sensor that gets a reading wrong but then is corrected (since the light dissepear).

The question is really, what sensors can give errors to the ECU that will give the injector warning light?

it says in your manual if the injector light comes on briefly then there is nothing to worry about,only worry when it stays on!

sh

In the swedish manual it sais you should contact Fiat authories garage ASAP.. but the translation maybe is wrong.. I have heard that before that you only should worry if its on all the time.

Is there possible to get the faultcodes out on a error even when the lamp have stoped flashing? Because its not very often showing up and the chance that it would if I take it to a garage it close to null

Had same symptoms, in my case it was Manifold Absolute Pressure Sensor (fairly cheap), but red light could be all sorts of things I guess. In my case it eventually started mis-firing a bit so we took it to Fiat who apparently found the cause by hooking a little computer up to the ECU, and the light wasn't on when I took it in so I _presume_ they either got lucky or there's some kind of short history stored in there.

How much did one of those cost? I read up a bit on them and it could be it .. thanks

If the light comes on for short times then goes off it's generally nothing to worry about.

It it's doing it often then it may be worth checking it out to keep your mind at rest.

The problem is that Im thinking about selling the car, and the laws here require me to tell all problems I know about the car, and saying that the warninglight popps up every now and then is going to lower to value drastic.

Also It is a real ass to drive the first 10-15 seconds when the car is cold, I think there maybe is the same fault as the warninglight. It do seems like the car behaves better when there is rain/snowing, which points to temprature/pressure sensor. My garage have closed for summer so I waiting for them to open up so I can take it there for diagnosis.

i would say water temp sensor, it fits in with what your saying plus i have changed hundreds of faulty temp sensors and only one faulty map sensor in five years, the odds are good.

kebab said:

i would say water temp sensor, it fits in with what your saying plus i have changed hundreds of faulty temp sensors and only one faulty map sensor in five years, the odds are good.

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I changed the watertemprature sensor this spring, could it already be broken?

I remember haveing one extra, which shows to high temprature but it works, just for testing.

kebab, just to be sure, you mean the one located back left on the engine looking from the front of the car? I have a 75SX (1996), if they happend to move it around at later revisions

i would assume its on the inlet manifold like on a 55/60 but its been a while, ive not worked on a 75 for ages.

There cant be that many connected in the "waterway" so I think I got the right one. To my (very limited) knowledge there is one that controls the gauge and ECU and one that controlls the fan that is connected in the heater matrix. Is that correct?

Still have that warninglight when changing the sensor, but this thirdpartycrap have two different connections (the original only have one) so I will try the other one tomorrow when the car is cooled down.

Thanks for your help.

Trying with my other coolenant temprature sensor and its behaving the same .. Jumpy starts when warm and sunny weather (and normal weather) but fine starts when its cold and rainy. And the red light coming on sometimes.
Since there is a intake air temperature sensor, could that maybe give there symptons?