Rpm going up and down when turning headlights on

[IM-32-FK]

I just did a service, changed spark plugs, oil and oil filter and flushed out my coolant 12 times before it came out clear.

but now when I took it for a drive, the rpms go up and down between 800-1000 when I switch the headlights on, constantly going up and down. 
 

what gives? Why am I always unlucky like this 

Edited December 14, 2020 by IM-32-FK

[Ben C34]

What ecu? What injectors?

[IM-32-FK]

Apexi power fc and OEM injectors. Injector 6 is right below the AAC valve hoses, and I had them leak onto it before. The injector is dirty on the outside. I think either the nipple on the AAC valve is corroded as hell or the hose is leaking. Could it be when I did it 12 flushes it would’ve forced more out and leaked onto injector six?

also I’d like to add that when I was changing the spark plugs, a part of the coil pack housing plug broke on cylinder 4, but it is still clipped in sitting tight. But I think this is unrelated 

im just saying this happened straight after the service

Edited December 14, 2020 by IM-32-FK

[GTSBoy]

99% it is the IACV.

[IM-32-FK]

12 minutes ago, GTSBoy said:

99% it is the IACV.

Hmm, did all the sludge block the IACV you reckon?

so taking off the whole unit, what do you recommended cleaning it with? Contact cleaner, degreaser or carbi cleaner? How, just lace the insides with the spray?Also can it simply be removed and put back on without having to readjust anything?

Edited December 14, 2020 by IM-32-FK

[Ben C34]

Yep, doesn't sound like injectors/tune is the cause fo this one. I vote iacv

[GTSBoy]

Mine was giving grief recently. I alternated doses of carby cleaner, WD40 and Subaru upper engine cleaner until it started controlling again. Did not feel like taking it off.

[GTSBoy]

In through the main air inlet hose that is. Don't confuse the water passage with the air passage.

[tridentt150v]

I'd also consider wrapping that broken part of the coil plug with some insulation tape....to be sure to be sure!!!

[IM-32-FK]

3 hours ago, tridentt150v said:

I'd also consider wrapping that broken part of the coil plug with some insulation tape....to be sure to be sure!!!

Too late I already put it all back together. It’s a pain to get to the spark plugs on RB’s. Hopefully it holds out for the next six months. Then when I’m changing the spark plugs again I’ll get a new plug. Don’t know why I just didn’t wrap some electrical tape when I plugged it back in. I was thinking about it but didn’t do it. Only after I put it all together I thought that I should’ve . Sometimes when something is done you access your work then wonder why you didn’t do a particular thing. Is there a word for that sensation?

on the other hand,I took off and cleaned out my iacv . But I haven’t started the car yet, so it got dark. I’ll see if it worked tomorrow 

[tridentt150v]

Well check it in the dark and make sure it isn't arcing out or doing something stupid at least.

[IM-32-FK]

Well cleaning out the iacv valve didn’t change anything. Could the plug on the coil pack be related to my issue? Is there any fuse or relay that it could be related to?(r34 gtt 25detneo)

also I noticed a ticking noise coming from the coil pack cover area. I think it may be arching? If you look from the top of the plug, only half of the top part of the plug is broken

Edited December 16, 2020 by IM-32-FK

[IM-32-FK]

I still haven’t solved this problem and it’s driving me crazy. I can’t even take my car out at night. Here are some things that I had a look at:

- IACV. I cleaned it. Didn’t fix the problem

- changed the broken coil pack plug. Didn’t fix the problem

- checked the maf wires. Nothing broken

- checked CAS wires. Nothing broken

- was told it could be a faulty water temp sensor. Disconnected it. Didn’t change anything

Like I said the idle fluctuates when I turn the lights on only, rpm fluctuates and voltage keep fluctuating between 13.5v-14.6v. When I turn off it sits at a healthily 14.3v

Can anyone please lead me to the right direction?could be alternator or reg be on its last legs?

Edited January 2, 2021 by IM-32-FK