RichM
Registered User
What would cause my catalytic converters to break appart inside after only 4000 miles?
The motor was rebuilt with a 0.030 overbore using stock type parts (hyperutectic pistons, i.e. nothing fancy) less than 4000 miles ago.
Other mods are:
Coolant level stable/normal
engine temperature normal
No "rotten egg" exhaust smell
No raw fuel smell in exhaust either
Gas milage between 18 and 23mpg mixed highway and city driving
Car ran great after rebuild, no backfiring or bad missing.
I'm pulling the plugs this weekend to read them, But I don't expect to find anything really wrong. I have a new fuel filter to replace the one that is a year old in case it got plugged when I swapped the fuel pump.
Engine codes are for SPOUT grounding and TPS voltage lower than expected. New DIS and TPS on the way, should be here monday. Crank sensor was replaced with engine, Cam sensor was replaced when SPOUT Grounding code was first seen many years ago with no effect.
I'm stuck in a catch22, The muffler shop won't warentee the replacments unless I "fix whatever caused the original cats to disinigrate". The other shop won't do a diagnositic on the car with the exhaust plugged from the broken cats, and I don't have the equipment to do the ignition system diagnostic myself
The motor was rebuilt with a 0.030 overbore using stock type parts (hyperutectic pistons, i.e. nothing fancy) less than 4000 miles ago.
Other mods are:
- Removed intake silencer
- K&N panel filter
- 73mm C&L MAF
- port and polished supercharger intake plenum
- Magnuson S-port blower
- Port matched intake manifold
- polished heads (no porting, no bowl work, no chamber work)
- 38# injectors
- 190 lph fuel pump
- Kook Mid-length headers
- Supercoupeperfromance.com downtubes w/ hiflow cats
- Supercoupeperfromance.com 3 inch cat back exahust
- New Double Platinum plugs 0.045 gap, now Magnacore wires,new O2 sensors (all from Supercoupeperformance.com)
- Stock Airbox
- Stock Throttle body
- 91 size supercharger pulley
- Stock IC and Tubes
- Stock valves
- Stock Cam
Coolant level stable/normal
engine temperature normal
No "rotten egg" exhaust smell
No raw fuel smell in exhaust either
Gas milage between 18 and 23mpg mixed highway and city driving
Car ran great after rebuild, no backfiring or bad missing.
I'm pulling the plugs this weekend to read them, But I don't expect to find anything really wrong. I have a new fuel filter to replace the one that is a year old in case it got plugged when I swapped the fuel pump.
Engine codes are for SPOUT grounding and TPS voltage lower than expected. New DIS and TPS on the way, should be here monday. Crank sensor was replaced with engine, Cam sensor was replaced when SPOUT Grounding code was first seen many years ago with no effect.
I'm stuck in a catch22, The muffler shop won't warentee the replacments unless I "fix whatever caused the original cats to disinigrate". The other shop won't do a diagnositic on the car with the exhaust plugged from the broken cats, and I don't have the equipment to do the ignition system diagnostic myself