Intake manifold gasket vacuum leak (1ZZ)
- Symptoms
- Lean code, rough cold idle, misfire
- Likely cause
- The original black rubber gasket hardens; Toyota TSB EG045-07 gives the updated (orange) gasket 17171-22060
- Fix
- Smoke-test and replace the gasket
- Applies to
- ZZE122R / 1ZZ-FE (US-sister evidence)
- Related fault codes
- P0171, P0300
- Confidence
- medium
Sources
- go-parts.com/garage/obd-p0300-pontiac-vibe-2005-2008-1-8l-1zz
- toyotanation.com/threads/2003-2008-corolla-matrix-pontiac-vibe-common-
Related problems on this car
- Ignition coil-on-plug failure / misfire
- Valve cover gasket and spark-tube seal leak
- ZZ oil consumption (1ZZ-FE/3ZZ-FE, worse on early builds)
- Dirty MAF sensor
Similar problems on other cars
- Lean code from an air leak (P0171) · Toyota Vitz (1st gen)
- Misfire from coil / carbon · Toyota Passo (1st gen)
- Throttle body carbon fouling · Toyota Passo (1st gen)
Where the parts are · Warning lights · Fault codes · Maintenance
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Guidance only – confirm with a mechanic before repairs. All common problems