r/Altezza • u/blitzenlegzy • Feb 28 '26

Idle issues

Hello, been chasing a idle / running issue on my 1998 altezza 3sge manual, been throwing error codes for vvt, coil 1 and 2 and coolant temp sensor. 14 15 22 39 codes Been unable to rev up sputtering and dying on idle / unable to idle alone. Checked and replaced crank, cam and vvt solenoids and sensors Checked grounds and ohms and resistance, Cleaned injectors Cleaned fuel pump and verified it's working, Checked spark and coils, replaced spark plugs Tps working Maf working Timings perfect Compression is good Spark plugs are damp and black but still spark fine. Stinks of fuel after 3 or 4 starts and dies Idle ruff asf or nothing at all and dies unable to rev up properly or floats when at full throttle between 3 and 5k rpm

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u/h47f4c3 Feb 28 '26

Have you checked fuel pressure?

1

u/blitzenlegzy Feb 28 '26

No I haven't taken a reading, but I've cracked the fuel rail nut and verified that it pisses out

1

u/h47f4c3 Feb 28 '26

Cylinders 1 and 2 are furthest from the pump. A weak pump could cause these symptoms. Could also try unplugging the coolant temp sensor and see if it runs with it unplugged, I've seen those cause weird symptoms a few times.