surging at idles

coupediesel

New Member
I have a 96 civic with a d16y8 boosted. The problem I have been having for a while is the car is surging from like 1500 to 2000 rpm at idle. I have fixed a bunch of stuff and tried a bunch of stuff to fix it to no prevail. None of the vacuum lines are leaking (used carb cleaner to check), I just put a brand new bosch o2 senser on the car, I have bled the coolant system twice, I am almost certain of no exhaiust leaks, I don't think the idle air control valve is bad because when I disconnect it during idle the car drops rpms and stays steady just like its supposed to. The only other thing that I could think of is the cold start is bad. Which I could run a hose to bypass that but I would rather not. Does anybody have any other suggestions? I am completely out of solutions and really tired of dealing with it. Thanks in advance!
 

civic209

New Member
Registered VIP
5+ Year Member
coupediesel said:
I have a 96 civic with a d16y8 boosted. The problem I have been having for a while is the car is surging from like 1500 to 2000 rpm at idle. I have fixed a bunch of stuff and tried a bunch of stuff to fix it to no prevail. None of the vacuum lines are leaking (used carb cleaner to check), I just put a brand new bosch o2 senser on the car, I have bled the coolant system twice, I am almost certain of no exhaiust leaks, I don't think the idle air control valve is bad because when I disconnect it during idle the car drops rpms and stays steady just like its supposed to. The only other thing that I could think of is the cold start is bad. Which I could run a hose to bypass that but I would rather not. Does anybody have any other suggestions? I am completely out of solutions and really tired of dealing with it. Thanks in advance!
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What do you mean by when you disconnect it? The idle air control valve? If you disconnect the idle air control valve shouldn't it start idling back and forth repeatedly?
If you havent cleaned the IACV then clean it. If you want to check if its a vacuum leak further then take off the air intake arm and cover the hole in the throttle body that goes to the IACV and if it goes down then it is not a vacuum leak. I would suggest checking the wires and see if no wires to the IACV are disconnected.
 


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