my idle jumps up then down even when driving,could it be the i.a.c valve? shoot me sum advice or any ideas of what could be the problem thanks

 

What are you working on? I assume your're talking about a fuel injected vehicle. You could have a vacuum leak causing this. The IACV could do this. I've seen a bunch of stuck open PCV valves. Pinch the PCV hose with some pliers to shut it off and see if the surging goes away.

 

yeah its fuel injected,okay i will try that thanks for the advice

 

I've got a B16A2 just rebuilt a little over 2000 miles ago. I finished but my car was surging as well. I replaced the IACV and fuel pump. I didnt look for a vacuum leak because I dont know how to find one! Haha. Could to enlighten me as to how to find a vacuum leak within the engine? I checked my CEL and it says ive got code 14 - IACV although I replaced it. Could the vacuum leak still lead me to that CEL? One more thing that boggles me is this sensor. I couldnt find where to hook it up, I believe its my BARO sensor but I cant find where the other plug went. The unhooked line goes to my intake manifold but the sensor remains unplugged.

 

B16A2??? I'm guessing that it's not in an Accord...lol

1. Fix your IACV error, if you replaced the sensor and it's still giving you an error there must be a problem with the wiring or the ECU.
2. That solenoid you have pictured is the electronic control for the rear engine mount.

To search for a vacuum leak, with the engine running, I take a can of carb/throttle body cleaner and lightly spray it around every gasket point and along each vacuum hose. Moving slowly along each gasket/hose (intake manifold to head, throttle body to intake manifold etc..etc...) closely monitoring the sound of the engine. if the idle drops you have found the leak.

 

Thanks for the response. But If i leave my engine running, then my fan will blow everything away. Should i disconnect it or will it still work as is?

 

It will still work as is. The property of this action is that the carb cleaner is sprayed directly onto the areas (wet). If there is a vacuum leak the carb cleaner will get sucked in through the leak immediately and cause the engine to falter.

 

Ok I understand. Thank you.