KaneStyles

hello my name is kane
I have a 1994 nissan maxima 3.0 v6 sohc Automatic. after driving the car for 10 miles..... After im done driving and i put it in to Park the engine revs up to 3000 Rpms then drops down to 2500 rmps and back and forth like Voom drop Voom Drop Voom Drop Voom and so on and it doesnt stop. "the Voom is 3000rmps. The 2500 is the drop" i have no idea what to do can someone help? thank you


REV UP WHEN THE TRANSMISSION IS EITHER IN PARK OR NEUTRAL

Darkwing48

iTrader: (1)

Clean IACV?

burhan92SE

U need to clean ur maf sensor fist and see if it fix it. If not then u can try adjusting the rpm cuz 2500rpm is pretty high, normal is between 700 to 850 for automatic. If it still doesnt fix it then u gotta go for iacv valve.

I assume u know where to locate all these things and how to performe the task?

Garf

iTrader: (1)

TPS, MAF, IACV

KaneStyles

yes ill clean them

KaneStyles

I cleaned both i even change both and the problem is still there ill change the maf next.. but the problem only happens when the car is warmed up so im thinking its a sensor it has somthing to do with the car warming up.
alsoi took off the throttle body and replace it it ran a little better but the problem is still there. im also thinking it might have somthing to do with the Ac cause there is no free-on in the system so im gonna unplug it and see if that fixes it. also theres a little screw under the throttle cable my friend unscrewed it and the problem went away completly but then the car idles at 600-700 then drops down after turning on the lights heat left indercator and feels like its gonna shut off. after trying all this stuff if it still doesnt work.... taking it to nissan...... then broke for 2 years... really dont want to take it to nissan cause its gonna cost me mad money which i dont have.

KaneStyles

yea so now what

Matt93SE

iTrader: (44)

sounds like a bad intake/vacuum leak to me.
do you hear any hissing sounds when you have the hood up?

The engine should be quiet enough to hear the lifters and injectors ticking. If not and you hear air somewhere, then the problem is likely an air leak.
since it only happens when it's warm, you might look at your EGR and tubing, IACV plumbing, and check your oxygen sensor for proper operation (it's detailed in the FSM on how to test it.)

KaneStyles

Here's all the videos i posted on youtube.
http://www.youtube.com/watch?v=DJXuJNhU2gw
http://www.youtube.com/watch?v=sg2yskgFAaY
http://www.youtube.com/watch?v=ReZiRhYZynI

3 different videos

Matt93SE

iTrader: (44)

Vid #3 shows classic signs of a major vacuum leak, but then it goes away.. that's what is strange is that it's intermittent.

KaneStyles

oh ok how do i test the vacuum leak?

Matt93SE

iTrader: (44)

read my posts in some recent threads:
http://forums.maxima.org/3rd-generat...-thoughts.html

KaneStyles

Ok im gonna test it tomrrower i bought a can of starting fluid... last time i did this the engine caught a fire but now im gonna be prepard to do it.
what i notice if i screw in the throttle bottle screw more in... it stops reving up. also that the car is about to die cause theres bearly any gas going in the engine to keep it on.... hopefully its a vacuum leak so its a easy fix.. and i passed state inspection.

internetautomar

iTrader: (30)

use carb cleaner with a straw, or even better use a propane tank with a flexible nozzle.

KaneStyles

propane tank? basically your telling me to go kill my self right?

internetautomar

iTrader: (30)

nope, propane is much more controlled plus you will typically have a valve that you can adjust the flow on and shut it off when not needed. Use it at the shop.

KaneStyles

Ok so i did the starting fluid test and i discoverd 2 things.
1 Iacv needs a new gasket cause it Rev'd up alot around the whole thing.
2 A little Hose right next to Iacv needs a clamp a little hose too....
Tomorrwer going to Advance Auto Parts.
Then going re-test that area again after i put the new gasket on with silicone and the hose clamp.... prior to 8 Hrs so the silicone can settle....

W00dface

Mines doing the same thing at the mo.

I have changed all the vac pipes thinking it was a leak and nothing. Im going to cleath the IVAC now and see if that makes a difference.

one thing I did notice though, was if I pull a spark lead, it stops doing it

W00dface

Iv'e just taken my IVAC off to clean and noticed it's cracked with coolant leaking!!!!!!