Quote:
Originally Posted by Kool-aid-82
Running with lambda, which worked well pre SSIs
Been checking fuel pressures and fuel ratios most if the day.
Car runs fine fine 10-15 minutes then stumbles and drops 200 rpm at idle
Fuel pressure runs constant at 3.6 bar throughout but
AF goes from 14.3 to 20/22 for a few minutes then goes back to 14.x like nothing happened.
Been thinking electrical but no luck yet.
Disconnect the WUR and thought that was it as it cleared up for a while.
I have run this with lambda connected and disconnected.
Cleaned grounds - again...
Still chasing
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Car runs fine fine 10-15 minutes then stumbles and drops 200 rpm at idle
I've heard of the Frequency Relays go intermittently bad, which would cause the intermittent lean running condition, so I would test/replace the relay first. Any intermittent electrical issue with the ECU, O2 relay or wiring could cause lean running. Or your ECU has a bad solder join when it heats up. Check the electrical plug in the engine bay above the driver shock tower.
Also,..........
I have run this with lambda connected and disconnected.
Could you explain this statement? Are you just disconnecting the O2 sensor plug or pulling out the relay under the seat? Does the car run any differently when the Lambda System is disconnected? Please confirm.