Cmbonni Posted February 9, 2019 Share Posted February 9, 2019 I’ve been fighting this dead cylinder/crappy idle forever and I’ve recently made a new discovery while tinkering after I got off work to see if there would be any change, which there was. I got home, left the car in drive and had my parking gear engaged. With the up and down idle the car would lerch back and forth. I disconnected the IACV and you can hear the air entering the intake and the idle getting faster and holding steady. ONLY with the car in drive and the IACV disconnected, if you disconnect Cylinder 2 (C2) spark plug boot you notice a drop in vehicle RPM and a noticable change in performance. If the IACV is disconnected but the car is in park then C2 will remain dead. With the IACV connected and the car in drive or park then C2 will stay dead. After some runs up and down the road I’ve determined the car seems more responsive but I’m unsure how the idle will be affected after I let the engine cool off as I just drove it about 12 miles home. Off camera I with IACV disconnected in drive c2 remained active but c1 was now a dead cylinder. So the misfire can change cylinders which makes this harder but atleast I know it’s less likely to be internal damage to the piston itself. So here is how it goes IACV(off)+park = no c2 Iacv off + drive =c2 comes to life, higher rpm but no c1 Iacv on + park or drive = no c2 The iacv was recently replaced with a used replacement from a vehicle wth 113k. I clean both of them but the rough idle persist. Any ideas? https://youtu.be/EvUnvBzzzYg Link to comment Share on other sites More sharing options...
RumbleRumble Posted February 11, 2019 Share Posted February 11, 2019 Does this only happen in close or open loop? Vacuum line cracks? Have you check the IACV for resistance ? Are the spark plugs in good shape? Swap injectors to the other side and see if it follows. Link to comment Share on other sites More sharing options...
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