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Technical Catalyser

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Technical Catalyser

I have told them I am not replacing a CAT until the misfires are solved.

If he can't solve the mystery, I am afraid it's going to Fiat.

There is a Garage nearby that specialises in tuning and disagnotics I am tempted to take it there, but I am concerned about racking up costs at different independents who can't solve the issues.
 
Dont assume its the cat though a recent major head gasket failure or rich running for a long time can take them out.

Talk to the tuning bloke Puntos are nothing special but see if he's anti Fiat. Some still live in the 1970s.

Consistent missfires on the same cylinders point to the ECU coil driver fault (repairable).
Rough running and poor fuel consumption when hot point to Lambda.
Poor tickover - air leaks MAF/MAP

https://www.fiatforum.com/stilo/218285-fiat-stilo-p0420-fault-code.html
https://www.fiatforum.com/punto/72577-ecu-fault-p0300.html

The latter could have been an old battery loosened up by his crash (why do folks ignore handling issues) or maybe his cat got thumped.
 
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Consistant mis-fires since a cambelt change (the guy insists the timing is ok) and the car runs smooth.

The guy said he messed with the crank sensor as it appeared lose.

I think it is running a little rich, but dash is reporting 46.7mpg.

I had decent acceleration, no lags etc.

The tuning/diag specialists I know are good from word of mouth, and the guy has spent sometime on the phone with me and offered alot of advice even though I havent had the car in there yet.

I am reluctant to send the car to fiat as they said there rates are £85 per hr, and to check re-do the timing is 2hrs+ according to them, and I am far to inept to do the work.
 
ECU is getting checked this Saturday.

I get the misfire reports at around 55-65mph (engine lights flash) but it's not a exact science, sometimes its fine, but the car doesn't feel like it's misfiring.

After the codes have been re-set I can get 2-4 days driving with no faults then bam.

I was worried about the CAT as I get the P0420 which is that CAT threshold warning.

And yup for sure there is no way a new CAT's going on until the mis-fire or is throwing up the mis-fire fault is diagnosed and sorted.

Edit: I never get the faults on start up, it's after a sustained run and engine is up to temp.
 
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