Blown cats - What are my options

GeoffCapes

Member
Messages
14,000
This is what I had done on my 4200 when the Cats collapsed.

Well, this was the second job as the first one was a total abortion!

76709
 

Oneball

Member
Messages
11,075
Would like to say I also have a P0103 code which indicates a high voltage for the MAF sensor, since both the MAF and lambda have high voltages could the problem be from an electrical component like the alternator?

No as the input voltage to the sensors is regulated by the ECU.

Just start working through the problems logically.

Id change the coils first.
Then look at the MAF, check it’s plugged in, then check the voltage at the plug could be a short in the loom.

Why do you think your cats have collapsed are you basing this purely on the error codes?
 

Twinspark

Member
Messages
460
I think the cars might be done as the car has a foul smell at the front when running for a while, it also rattles a bit from undeneath at slow speeds but that might be due to the worn mounts/bushings which I have but not fitted yet.

The shop recommended changing the cat among other things but I’m not taking their word on it just yet, I’ve got two bad coils(cylinders 1 and 5) but I can’t figure out which cylinder uses a front or rear coil as they’re different parts.
 

Zep

Moderator
Messages
9,110
I think the cars might be done as the car has a foul smell at the front when running for a while, it also rattles a bit from undeneath at slow speeds but that might be due to the worn mounts/bushings which I have but not fitted yet.

The shop recommended changing the cat among other things but I’m not taking their word on it just yet, I’ve got two bad coils(cylinders 1 and 5) but I can’t figure out which cylinder uses a front or rear coil as they’re different parts.

You can use the same coil on both, it’s only the length of the cable which changes.

 

hashluck

Member
Messages
1,515
Because they wanted shorter wires on the front cylinders.
Always made me laugh this. Only Maserati could specify 2 different coil packs on the same engine for purely aesthetic reasons especially, as Zep says, when the wires are hidden under a cover. Even more Maserati is to then have one of the two part numbers 'no longer stocked'!
 
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