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Old 05-27-2022, 04:36 PM   #4
trottida
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Join Date: Oct 2005
Location: North of North of Toronto, Northern Ontario, Canada
Posts: 3,025
 

1999 SL2
2001 SL1
Default Re: Im back <3 with a fun one

Here's what the inside looks like and what gets clogged up.

Perhaps your engine is running rich causing carbonization. Carbonization in the engine and exhaust is common in these cars when you have a failing thermostat, bad ETCS and/or fouled ETCS harness connector. For a GEN3 your temp gauge in the cluster should read around 1/3rd (see photo below). If it is around 1/4 then you likely have these issues. This would be the root cause of a clogged pre-cat. The PCM signal for coolant temperature reads cool so the engine management increases fuel to bring the engine to proper operating temperature (~193 F) which it never does because of the failed component(s). Extended running like this causes the black sooty carbon build up.



...
1999 SL2 MT (299,400 km @ 11/2021)
2012 Ford Focus SEL HB MT
2011 Suburban LT

Past Saturns
2001 SL1 MT (438,500 km 11y)
1993 SW2 AT (10y)
2001 LW200 MT (3.5y)
1992 SL2 MT (5y)

:canada:
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