Sputtering off idle

[Zreberlcoe]

Okay so when the car is at Idle and you flick the accelerator the motor drops in RPM before it goes up. I was thinking it was the TPS, but I checked the Ohms and it seems to be fine. I have been searching for a vacuum leak but I haven't had any luck! I checked the intake L boot, the ICV, and other vacuum lines. Also when you pull through second gear, throttle fully open, from about 4000-5500 RPM the motor seems to lag and pick back up again just slightly.

Here's a video:

https://flic.kr/p/nGjHkA

[jlevie]

The only way to find intake leaks is to have a shop run a smoke test. Other things are possible, but rule out intake leaks first.

[Zreberlcoe]

The only way to find intake leaks is to have a shop run a smoke test. Other things are possible, but rule out intake leaks first.

Is there a smoke test I can do at home?

[dnguyen1963]

yes, there are lots of DIYs out there. Google is your friend. You have to remember to keep the pressure between 2-4 psi by plugging both intake and exhaust to find all the leaks.

[jlevie]

yes, there are lots of DIYs out there. Google is your friend. You have to remember to keep the pressure between 2-4 psi by plugging both intake and exhaust to find all the leaks.

And you must use oil smoke.

[b1mm3r]

Try running some seafoam also. Could be fuel related, have you checked fuel pressure? What about spark plugs, checked those?

[Zreberlcoe]

I replaced spark plugs with Bosch super plus. Replaced air filter. I don't know about fuel pressure or the last time the fuel filter was done. I just sprayed all the intake anything and vacuum lines with a full can of carb cleaner and found no change in idle. And I unplugged my ICV for a couple of seconds and plugged it back in and nothing changed, is that bad?

[mpowerful]

Your car shouldnt run at idle with iacv unplugged. Perhaps iacv is stuck open.

[Zreberlcoe]

Your car shouldnt run at idle with iacv unplugged. Perhaps iacv is stuck open.

Suggest replacement?

[jlevie]

Your car shouldnt run at idle with iacv unplugged. Perhaps iacv is stuck open.

Actually it will and should idle at a slightly higher speed.

[E30Gus]

Mine does this off throttle and have narrowed it down to the AFM trace degradation. You can swap with a known good AFM and see if it goes away.

[pandaiswong]

Maybe your AFM just needs adjustment?

http://www.youtube.com/watch?v=yQukm7lNux4