Slowing down to a stop and putting the clutch in, RPM's will now often drop below the normal 600 rpm level to 3-400 before coming back up. I recently changed out #2 coil and plug which had brought on an 0607 code, all well now.
What could be causing the dip in RPM? (Alternator appears to be charging ok)

 

Clean your IACV out.

 

i'm looking at the throttle body area, where exactly is the IACV, how difficult to get off?

 

http://www.moodym.com/maxima/cullen/cullen.html

 

just passed the throttle body on the intake manifold... there are 3 different colour plugs going into it and 3 bolts and a gasket (i think?) to take it off. the little cap thing (3 small phillips) that covers the little breather can get dirty.

 

i'm a little daft... so on the right side of the throttle body, no need to remove that entire fixture with the 3 or 4 major wire plugs, just the little cap with 3 phillips screws that faces the firewall on a slight angle comes off and you clean inside there??

 

What if you IACV is clean? I have the same issue. but I've cleaned my IACV a few times already..

 

Good thought, my original thought was a dirty fuel injector. As mentioned earlier, I recently replaced my #2 coil and plug with used ones which cleared up the misfire problem i was having. I am reluctant to replace just 1 fuel injector as the common wisdom is to replace the whole set with brand new ones. As an interim step, I have put a healthy does of SeaFoam cleaner in the tank and things seem to be improving now on the RPM issue I raised. I have used SeaFoam in a motorcycle with great success as it a super carb, tank and gas line cleaner with no residual issues. I have also used it sparingly in the car every few months particularly if there is the slightest hesitation in starting. You may try some SeaFoam before getting to heavy into injectors or coils.

http://www.seafoamsales.com/

 

Here is a general pic of the IACV location. 3 12mm bolts hold it in. You need to take the whole thing out to clean it. http://www.justanswer.com/uploads/NI...trol_valve.JPG

Heres what the IACV looks like taken out http://i.ebayimg.com/t/95-96-97-98-9...9uHq!~~_35.JPG to find it, look for those colored plugs on the driver side of the motor.

 

I got the entire IACV off and after removing the little triangulated 3 screw (phillips) cap, on the inner blockface side, found a disgusting little mound of grimy silt that had accumulated almost totally impairing the internal airflow of the unit. I cleaned it off, but did not attempt to remove the outer triangulated cap fearing that unlodging any electronics or vacuum sensors might not be a good idea. Hopefully, what I have done will rectify the intermittent drops in RPM i was having coming to a stop with the clutch in. As this problem was not present when the AC on, which would have forced the revs up, I am assuming this was indeed an IACV issue. Good idea to clean as routine maintenance, this was helpful:


How To Clean IAC valve:
• Tools needed:
• 10 and 12 mm sockets
• 3 inch socket extension
• universal joint (swivel pivot socket thing)
• 12-inch rachet (a short rachet may not work - need something to apply a lot of torque to loosen the bolts)
• Philip's screwdriver
• rag
• throttle body cleaner

1. Unplug the 4 connectors from the IAC assembly. Undo the hose that connects teh IAC to the intake assembly.

2. The metal bracket holding up the gray-colored connector is blocking one of the IAC mounting bolts. Using a 10mm socket, remove the bolt that holds the metal bracket. The bolt is just below the purple connector - you have to twist your head and crane your neck around to see the bolt.

3. Remove the 3 mounting bolts using the 12mm socket. The lowest bolt may require the Universal joint.

4. Pull out your IAC valve and clean it w/throttle body cleaner, rag, and old toothbrush.

You may even want to separate the plastic valve to clean it more thoroughly. Use a philip's head screwdriver, but make sure it is a snug fight. It's on there tight and if you don't have a good fitting screwdriver, you could ruin the screw head.

Reinstallation is just the reverse of these steps. It may be easier access to the IAC if you remove the whole air intake assembly, but it's not necessary.

 

[QUOTE=carsnwomen91;8574120]just passed the throttle body on the intake manifold... there are 3 different colour plugs going into it and 3 bolts and a gasket (i think?) to take it off. the little cap thing (3 small phillips) that covers the little breather can get dirty.[/QUOTEI

I cleaned the dirt under the little internal breather cover, have you ever removed the outer plastic cover (also with 3 phillips)? what's in there, any moving parts or anything that can get jammed or sticky or is just cleaning the internal open sufficient?