I have just fitted my 1.2 engine and have a few problems.

for a few months with my 1.1 the engine had a weird and random flat spot. and a week or so before the engine swap the engine had a strange idle where some times with would hop (it would rev up and down a hundred or so rpm every 2 seconds or so) there was no warning light.

now I fitted the 1.2 engine and it was still the same (maybe a little worse) so I disconnected the lambda sensor to see if it would throw up a warning light. Nothing! ran the same.

So I fitted my new chip and now when the engine is started the injector light blinks for about 20seconds then stays on. the car is in limp mode with a 5000rpm rev limmit it seems.

Disconected the lambda again and the light still flashes and stays on with no change to the engine.

anyone have any ideas? (i recon lambda) but why does the warning show with mckcrich chip and not with stock chip?

I'm not sure, but I think one of the lights show up to say that the immoboliser is disabled due to the new chips settings. Not totally sure about that, you'll have to wait for others to respond but I'm quite confident that's it.

Luke.

yeh that light is on and i know about it! its the red injector light that comes on for about 2 seconds when you turn on the ignition.

Ok just took another look, it seems it does all this even with the engine not running!!!
Turn the ignition on. you hear the pump buzz and the light come on for 2 seconds as usual. then it goes out for a few seconds. It will then start to flash for a while before staying on.

I have a video ill post up as soon as youtube sorts it out

you have a sensor out somewhere. when i had the stock ECU it did it when i smashed the charcoal cansiter solenoid to pieces

check your wiring.

*BUMP*

My mate just turned up.... he has a punto 55 so I just swapped the lambda out of it. showed same thing! I reset the esu and everything else. also tried a new temp sensor (one on the TB).
now I just pulled the ecu out and refitted the old chip... the injection light has stopped and the car is no longer in limp mode.

Any ideas? why would this chip detect a fault the standard chip dont? the ecu is the right model btw

Craig

Hunting idle is usually map sensor related (often the piping, rather than the sensor itself).

The McCritch issue might be that it simply isn't seated right (clean contacts with something like a pencil eraser).

In a real sense you've made things harder for yourself by introducing another variable before you sorted the problem out.

arc said:

you have a sensor out somewhere. when i had the stock ECU it did it when i smashed the charcoal cansiter solenoid to pieces

check your wiring.

Click to expand...

Right I thought you was onto something there cos i removed my charcoal canister/solenoid! so i quickly refitted the chip (made sure it was all clean).
Grabbed the solenoid and reconnected it.
I was hopefull but it sadly never worked .

I even blew into the solenoid while my mate turned the car on and the solenoid opened so it does work.


I will try my mates map sensor tomorrow. altho I checked over every pipe while they where off the engine and have checked them over today.

Right I just found this https://www.fiatforum.com/cinq-sei-technical/113898-mckcrich-chip-reducing-limiter-problem.html

Gotta be a ****ed up connection somewhere! grrr

see.. if people would listen to me, things would get done a lot quicker

arc said:

see.. if people would listen to me, things would get done a lot quicker

Click to expand...

LOL I did listen to you and tried it but that never worked mate
does the charcoel canister have to exsist? I just fitted the valve type thing and it clicks so i know it works. cant see how it would detect anything as its only a two wire thingy

I highly doute the chip is at fault (I worked with EPROM's for some time, as long as a checksum was done and the chip passes it will work fine. unless it is faulty or killed by ESD in which case it wont work at all)

GREAT I just started my car to drive it off the road and the light never came on! so i turned it off then back on to see if it had stopped and then i came on! bloody thing!

are you swapping just the chip, or the whole ECU? just check the ECU main harness is tidy enough and the pins aren't damaged.

arc said:

are you swapping just the chip, or the whole ECU? just check the ECU main harness is tidy enough and the pins aren't damaged.

Click to expand...

Just the chip. I checked the whole ecu over when I swapped the chip back around and it all looks good.

Alright guys, ive got my new lambda sensor and that never cured it :-( I checked all the wires and checked each wire for continuity(sensor to ecu)! and found nothing that seemed odd.

One thing I did notice is that...
When you turn the ignition back off (wether or not the engine had been run) there is a ticking sound coming from the idle valve/plunger. It clicks for a min or so then the white relay next to the ecu will click then the valve stops clicking.

When i noticed this I swapped the valve for one out my spare throttle body. (I turned the igniton on then off with the valve out and I could feel it pulsing) this never cured the fault. (swapped out all the sensors on the TB)

I dont seem to be able to hear this ticking when using the standard chip.

Ive just been for a drive with the standard chip and the flat spot the car used to have seems to of gone (recon the lambda was getting a little slow) but the idle is still sometimes going up and down.

ticking is the idle control valve

clicking/tapping sound is the injector

change the map sensor or the blue plugged sensor on the inlet manifold (water temp sensor)

the tickin is from the idle valve

yeh im about to try the map sensor once my mate turns up.
the manifold (water temprature sensor?) seems ok if i remove the plug the car revs up alot. I swapped one out from another manifold and it did the same so im sure its fine!

just the map sensor now :worship:

:bang: Map sensor is fine! :bang:

next thing to try is another ecu. my mate would not let me tear apart hes punto ecu but lucky enough he has a spare ecu he took off a car about to be scraped. fingers crossed its got a socket for the chip.

Tried another ecu.... still the same :bang::bang::bang::bang::bang:

sadly my mate wouldnt let me try the chipped ecu in hes car

Im really lost now! the standard chip seems to be running great now its learnt the car (done about 55miles) and it idles perfectly.