The car: 1JZ, manual, stock ecu/injectors, APEX-i AFC NEO, AEM Wideband gauge/controller.
Symptoms: Idles poorly, A/F ratio off the lean scale at idle and cruising, richens normally under boost. No ECU codes, vacuum reading normal, no leaks detected.
When it started: After cruising on the freeway a bit, took my kitten into the vet. Dropped her off, came back out, and the strange idle started. When I went to pick her up 2 hours later, noticed a/f ratio issue.
Possible causes: My theory is MAP sensor or the wideband sensor is bad.
The pressure reading (on the AFC) has never really quite matched the display that my boost controller says. They've always been off between 6-12 kPA depending on random chance it seems. If this is normal I'll say the MAP is good.
When I blew up the engine in July a lot of oil went into the exhaust, enough for it to drip from the connection to the downpipe. It's possible that the oil has contaminated the sensor with enough carbon deposits to shorten its lifespan considerably.
Everything was fine as long as I was driving the car on the freeway regularly, but after sitting in the garage for almost a week, it's worse. I actually had to program the AFC to richen the mixture at idle just to keep it running today when I had to run an errand.
As long as I can get the car into boost, the mixture goes all the way rich and everything is fine. Just can't seem to figure why it's so lean under vacuum. Any ideas?
Symptoms: Idles poorly, A/F ratio off the lean scale at idle and cruising, richens normally under boost. No ECU codes, vacuum reading normal, no leaks detected.
When it started: After cruising on the freeway a bit, took my kitten into the vet. Dropped her off, came back out, and the strange idle started. When I went to pick her up 2 hours later, noticed a/f ratio issue.
Possible causes: My theory is MAP sensor or the wideband sensor is bad.
The pressure reading (on the AFC) has never really quite matched the display that my boost controller says. They've always been off between 6-12 kPA depending on random chance it seems. If this is normal I'll say the MAP is good.
When I blew up the engine in July a lot of oil went into the exhaust, enough for it to drip from the connection to the downpipe. It's possible that the oil has contaminated the sensor with enough carbon deposits to shorten its lifespan considerably.
Everything was fine as long as I was driving the car on the freeway regularly, but after sitting in the garage for almost a week, it's worse. I actually had to program the AFC to richen the mixture at idle just to keep it running today when I had to run an errand.
As long as I can get the car into boost, the mixture goes all the way rich and everything is fine. Just can't seem to figure why it's so lean under vacuum. Any ideas?
