- Dec 16, 2012
- 118
Okay, next issue... my car is running a little bit rich. Scanning it and reading about -8% LT when idling. When at around 25% throttle and 50kpa MAP LT fuel trim is just -1%. Pressing the throttle a little bit more and at higher MAP I get -4% to -8%. Values are not that much off so the check engine lights is not on and no DTC thrown.
I have been driving for a while so the LT Fuel trim is stable.
When I first bought the car it had DTC P0172, but after a reset it didn't come back.
For the record, what I've changed so far is spark plugs, air filter, engine oil, O2 sensor. I have also cleaned the throttle body and what was possible inside the intake manifold.
I've soon run two bottles of injector/fuel system cleaner through the system as well. Fuel pressure at idle is 55 psi. MAP sensor seems to be reading accurate pressure. ( http://gmtnation.com/f25/manifold-absolute-pressure-during-different-throttle-positions-6265/ )
Any ideas? What else could I check? Not so keen on pulling out the injectors so I'll try all other alternatives.
I have been driving for a while so the LT Fuel trim is stable.
When I first bought the car it had DTC P0172, but after a reset it didn't come back.
For the record, what I've changed so far is spark plugs, air filter, engine oil, O2 sensor. I have also cleaned the throttle body and what was possible inside the intake manifold.
I've soon run two bottles of injector/fuel system cleaner through the system as well. Fuel pressure at idle is 55 psi. MAP sensor seems to be reading accurate pressure. ( http://gmtnation.com/f25/manifold-absolute-pressure-during-different-throttle-positions-6265/ )
Any ideas? What else could I check? Not so keen on pulling out the injectors so I'll try all other alternatives.