Rough Idle, Chugging On Accel – Lambda System Not Working
Had to repost this thread, because the first one I posted is throwing a 403 error.
Hi. I'm scratching my head a bit on this one (but admittedly that doesn't take much).
11633 suddenly started shuddering and chugging at a traffic light and I drove carefully, white knuckled home with very little power when starting up from each subsequent stop. My idle is now very randomly up and down (not seeking, nor in any noticeable pattern) and it really wants to die when I try to start moving or accelerate (I've taken it around the block a few times here and there to test).
The odd thing is, after finding that my frequency valve bulkhead connector female pins were so loose they were probably not making contact at all, I found that I could completely disconnect or connect it with zero effect at all on idle. I then noticed the same thing when unplugging my O2 sensor (no effect at all), and was further surprised when I was able to disconnect and reconnect the whole Lambda ECU with absolutely zero effect.
Am I right in thinking that depressing the full throttle enrichment dipswitch should alter idle? Mine doesn't.
Replaced Lambda relay with no effect.
The grounds and power to the ECU seem to be fine.
:banghead:
Video illustrating the erratic idle (turn your sound up): https://www.youtube.com/watch?v=YA0oI4pz-5M
Rough Idle, Chugging On Accel – Lambda System Not Working
Check the ground for the lambda system that runs off the RH intake plenum near the back. It's off the side. Is that in tact? It should be bolted on with a ring terminal then becomes a spade terminal junction.
By back I mean closest to firewall :)