VN S1 high idol rev

[Whiteford88]

hey guys, I just took my throttle body off and cleaned it out with a dab of petrol (had black soot everywhere, shiny as now ) and even sand papered it down a tad.. problem is, hooked everything back up, but now it revs high as hell (2,000, drops to 1700) and sometimes even goes to 2200 AT IDOL!!!
I unplugged and plugged back in the sensor wires (I'm presuming TPS and some other little one idk what it was) and did the whole neg battery resets comp rev at 3000 for ten sec and still no freaking change in idol.
At first the check engine light was coming on, did a diagnostic and got what seemed to me 13/3 and 43. Looked it up was the TPS, i unplugged the little connector cable and blew on it and hooked her back up and reset the computer (again). No change in idol!!!!!!!!!!!!! I diag'ed again and you wouldn't bloody believe it, I GOT CODE 12!! I drove the car for 5min around my farm at idol and a bit higher (Did not exceed 30 and held second gear)
I'm completely stumped, can someone please help me this is very frustrating

[Whiteford88]

does anyone plan on helping at all or what

[delcowizzid]

air leak or dead tps or now has more gap round the blade from the sanding

[wortus]

If it's not a loose or missing vacuum hose it sounds like the IAC valve could be buggered or blocked. Did you remove it before you cleaned it? I'd be removing it, testing it and checking if the passageways to and from it are blocked with any crud you loosened off.
The electrical parts on the throttle body should always be removed if you plan on soaking it in a solvent.
Sanding the inside is not recommended as it's meant to have a smooth surface for a reason. How much did you sand out and how rough is the bore now? You may need to go and buy another one?

[Whiteford88]

I didn't remove those no, lol. I sound like an idiot at the moment I'll bet (:
I didn't 'soak' it in solvent persay, I dabbed the towel I used in a bit of petrol and rubbed it, there was barley any on the bore at all.
Sanding it made it smooth mate, lol, and I didn't sand away piss all, it is just the type of sand paper to smooth something back, not even a millimeter lol.

[Cheap6]

If those vac. hoses are OK (^^), what was/is the condition of the brown coloured 'O' ring between the IAC and TB?

[Whiteford88]

Ok, SO I am presuming the IAC is the little device thing that also plugs into the throttle body, and not the one DIRECTLY under the throttle plate? Cause there is no way in hell thats not the tps lol, but if that's what your talking about then i pulled it out just then and it's 100% fine, there was alot of black soot and shit in there and the WD40 fixed that, clean as new now, was pretty dirty! I don't know if it had anything to do with it but we will see.
I'm going to go and plug it all back up and see how it goes.

[MAHOOVKV8]

The idle srcew might have turned up becasue of the dirty throttle body, try adjust the idle screw (unscrew it) count how many turns you go just in cause it does nothing so you can put it back where it was if this doesn't fix the idle.

[Whiteford88]

Lol, you wouldn't believe my luck, I started using my IPOD, my $639 ipod might I add, as a flashlight because of how dark it is and I don't have a light that shines on my engine, I had it balancing in a hole in the underside of the bonnet, and i moved my arm and donk, knocked the ipod IN the bonnet, so now my Ipod is in the actual bonnet and I can't reach it.
FML

[MAHOOVKV8]

Lol, you wouldn't believe my luck, I started using my IPOD, my $639 ipod might I add, as a flashlight because of how dark it is and I don't have a light that shines on my engine, I had it balancing in a hole in the underside of the bonnet, and i moved my arm and donk, knocked the ipod IN the bonnet, so now my Ipod is in the actual bonnet and I can't reach it.
FML

Thats sucks mate

[Whiteford88]

Well I got it out, I've hooked everything back up fine, what a bloody clean up job that was!
Unfortunately, I started the car (Without the pod filter or the tube, just throttle body) and she started up (i didn't have the accelerator hooked up & what not) and she reved at 2,500RPM!!!! But, then, after about 2 seconds of doing that, it started to decline down to 1,500rpm..
So Something IS controlling the idol, just not properly!
I also did another diag, and got error 42.

[Whiteford88]

Looked it up,
42 Open or short on EST or BYPASS line to ignition module.
How could that possibly have anything to do with my idol speed!?!? urgh!!!
I have gotten:

NO problem 12
Oxygen Sensor 13
Spark timing 42

I'm completely stumped.

[wortus]

Looked it up,
42 Open or short on EST or BYPASS line to ignition module.
How could that possibly have anything to do with my idol speed!?!? urgh!!!
I have gotten:

NO problem 12
Oxygen Sensor 13
Spark timing 42

I'm completely stumped.

The idle is controlled by the ECU, it adjusts the IAC valve to control how much air bleeds past the throttle which in the idle position is closed. Your not meant to adjust the little screw it's not there for setting the idle speed. If this and/or the passage ways are clogged up the car may not idle properly.
Did you test the IAC valve? I think to do this you remove it from the throttle body and turn the ignition on and it should move in and out a few times this confirms the valve is OK. These valves were also revised along the way to improve their operation so if you have an early one it may be worth changing it over.
Also how old is the oxygen sensor? Also if the faults are intermitttent have a good look at your wiring and connectors. I remember my VN a lot of the connectors had rubber seals and caps which were starting to perrish, there getting pretty old now.
Other things to check off the cuff are fluctuating alternator voltage and take a look at your ECU to see if any tracks on the PCB are damaged (you didn't give or recieve a jump start recently did you?)
You could also try checking your spark plugs and spark plug lead resistance.

[Whiteford88]

The idle is controlled by the ECU, it adjusts the IAC valve to control how much air bleeds past the throttle which in the idle position is closed. Your not meant to adjust the little screw it's not there for setting the idle speed. If this and/or the passage ways are clogged up the car may not idle properly.
Did you test the IAC valve? I think to do this you remove it from the throttle body and turn the ignition on and it should move in and out a few times this confirms the valve is OK. These valves were also revised along the way to improve their operation so if you have an early one it may be worth changing it over.
Also how old is the oxygen sensor? Also if the faults are intermitttent have a good look at your wiring and connectors. I remember my VN a lot of the connectors had rubber seals and caps which were starting to perrish, there getting pretty old now.
Other things to check off the cuff are fluctuating alternator voltage and take a look at your ECU to see if any tracks on the PCB are damaged (you didn't give or recieve a jump start recently did you?)
You could also try checking your spark plugs and spark plug lead resistance.

I cleaned out the tb 110%, and then over again. Checked the valve and it had alot of carbon residue on it (I think that's what it is) but I cleaned that all off too.
I tried your little checking thing, I pushed the IAC valve down and turned on the ignition and I felt a tiny jolt (like a little toy car motor rotating) but it didn't go up OR down. and then after numerous turning on and off it didn't even feel like it was trying anymore.
Unless I checked it wrong, I would say that this is the problem.
P.S: Where is the oxy sensor?

[Cheap6]

Ok, SO I am presuming the IAC is the little device thing that also plugs into the throttle body, and not the one DIRECTLY under the throttle plate? Cause there is no way in hell thats not the tps lol, but if that's what your talking about then i pulled it out just then and it's 100% fine, there was alot of black soot and shit in there and the WD40 fixed that, clean as new now, was pretty dirty! I don't know if it had anything to do with it but we will see.
I'm going to go and plug it all back up and see how it goes.

The 'O' -ring was 100% fine or just the IAC valve?

Maybe also check the gasket between the TB and inlet manifold (you had the TB off, yes?).

I wouldn't worry too much about the fault codes until nyou sort the idle - messing about with things, especially if a stall has occurred can trigger the codes. Best just to note them and then clear them at this stage.

[Whiteford88]

It's all sorted!!!
I was plugging it all back in (I did NOTHING that I didn't do before) and I was expecting the high idol ect so I didn't even have the piping hooked up for the filter, just running and open manifold, and started the car and isntant 900RPM!!!!!!
I was amazed!!! IT FIXED ITSELF! lol.
SO I celebrated with a 50m burnout on the dirt, and she's puring 100% fine, if not better! It's throttle is ALOT more responsive now!

[wortus]

Good news! Must have been dirty connectors, check the seals on the electrical connectors they may be perrished. The O2 sensor is on the passengers side exhaust manifold and has 1 wire coming out of it and this wire should be cliped to the rail/inner guard of the car.

[Whiteford88]

Good news! Must have been dirty connectors, check the seals on the electrical connectors they may be perrished. The O2 sensor is on the passengers side exhaust manifold and has 1 wire coming out of it and this wire should be cliped to the rail/inner guard of the car.

Ohhh yeah I noticed that a fair bit actually but I didn't touch it!
When I was putting everything back I moved it a bit and pushed the connector in just to make sure not even thinking it was a problem and I moved the wire around a bit, maybe that was the problem? I must have bumped it when I was taking it out? Oh well, everything is working now!!
Thank you so much for your help guys!