Weird Idle- All G owners should take notice!

[4drmadness]

btw did this happen when u were putting the tb spacer on?

[BrandAidDesignG35]

Sorry to hear it's fubar'd on ya...

too bad let us know if you find one, oh, wait man, you should get an upgraded throttle body while your at it

Is the G's TB 91mm? I cannot recall right now, you could upgrade to make it worth the trouble

[tollboothwilley]

I found a TB for $80 shipped, so I'm going with that.

I haven't even heard of an upgraded TB. People are running 12 lbs of boost on the stock TB. Why upgrade...

[BrandAidDesignG35]

Oh sorry John, must be a V8 drag thing...

Just something to consider, this is my theory, if you smash your car into a wall and need a new bumper, do you buy an OEM replacement? Or do you buy an aftermarket body kit for around the same price or a bit more? I think you know the answer.

I see error as opportunity to improve, hopefully I'll blow my transmission, cams rods and pistons.

*knocks on wood *

jj, I would rather not have that happen, but you see the benefit from this phylosophy, at least if you have a problem, you always have an improvement around the bend.

[tollboothwilley]

Ya, I hear what you're saying!

V8's go for the TB as a big improvement.

The real thing for us is to get the ECU to control the TB diff. That requires a relash from Technosquare!

[Todd157k]

Ya, I hear what you're saying!

V8's go for the TB as a big improvement.

The real thing for us is to get the ECU to control the TB diff. That requires a relash from Technosquare!

The only reason we (they) go with bigger TB's is if they do all the intake->exhaust also. Bigger intake manifold, heads, valves, cam, headers. Otherwise is money wasted.

btw- This is one of those "must save in my files" post. Thanks!

[tollboothwilley]

For a lot of trucks with V8's I know people that go TB, Cams, & headers.

[BrandAidDesignG35]

So how is your situation now, is the idle back to normal with the new one in?

[tollboothwilley]

new one is in TRANSIT

Should hopefully be here soon. Its coming from FL though and left on WED via UPS. Probably won't be here until beginning of next week. Haven't been driving around much. I don't want to cause any problems from the high idle.

[tollboothwilley]

New TB installed. I thought it was fixed, but the symptoms returned. I'm gonna have to post up a video. Steve, could the MAF cause this kind of problem?

My rpm at idle when in D dropped as low as 750 (which is in range) but is now back around 800.

My idle in P is almost 1000 rpms.

The biggest issues is when I'm braking. I can feel it shift into other gears. It almost feels like during braking that I get a tap on the gas and a quick surge for half a sec. It doesn't feel safe.

[tollboothwilley]

STEVE

[SteveTheTech]

Crap I remember seeing this early Saturday at work and I meant to answer, sry.

A MAF could cause an all base idle, however I lean more towards the TB that you installed. I would not be surprised if your CEL came on with an ISC system related code. The self learning needs to be cleared and the idle volume learning needs to be reset. You may have tried to do this manually and you may not have. But it needs to be done.

GL

[tollboothwilley]

I reset the ECU via the gas pedal timing/stomp precedure. I then did the relearn idle air volume procedure.

Idle dropped to 750 rpms.

I drove the car around for a little bit and idle went back up to 800 in D and around 900-1000 in P.

Somebody said that it could be a plenum leak, do you validate this idea? I am waiting for a CEL light to come back on so I can read the codes, then I'll post them up.

I reused the TB gasket. I might try replacing that...

[SteveTheTech]

I reset the ECU via the gas pedal timing/stomp precedure. I then did the relearn idle air volume procedure.

That's a good start, without any real data I can't say much more.

Idle dropped to 750 rpms.

Always a better sign.

Somebody said that it could be a plenum leak, do you validate this idea? I am waiting for a CEL light to come back on so I can read the codes, then I'll post them up.

I reused the TB gasket. I might try replacing that...

A plenum leak may be possible but not the most likely symptom you would be experiencing. I think it sounds like an Idle Speed Control issue that, unfortunately is not uncommon after replacement of non OE TBs. Unless you damaged the gasket or improperly installed the TB I wouldn't worry about I wouldn't look at the gasket. You might want to try unplugging the TB and waiting about 10 minutes then redo the closed throttle learning procedure and Idle Volume Learn.

[tollboothwilley]

What are the symptoms of a plenum leak?

MY SES light came back on. I'm going to take it to Autozone to get the codes read then I'll unplug for 10 min and do the relearn procedures like you said.

[tollboothwilley]

Ok, the Code was P0507 High Idle - Idle Control System.

So I disconnected the TB for a good 15-20 min. Did the TB closed position relearn then the Idle Air Volume. Idle dropped to ~750 but then after revving it would only drop to 800. Funny thing is that when the idle drop after revving it pauses at 1100 rpms slightly.
Modified by tollboothwilley at 12:51 PM 2/2/2009

[SteveTheTech]

I think I figured out what is going on here. While reading a different thread i read your signature, and noticed you have a 2* timing advance. That's the reason you cannot reset your base idle.

You will need to reset that,IDK how you did it. I am assuming you had someone at a dealer bump it for you. Well now you will have to reset it in order to perform the IAV learning correctly.

It seems like your best bet is to bite the bullet and take it the dealer and pay to have this resolved correctly.

[tollboothwilley]

the 2* timing advance will screw things up? Would the 2* have to be reset back to 15* BTDC in order for the idle to relearn?

I think that my TB wasn't hurt/ruined by the CRC fluid.

i swapped back and forth and did all sorts of resets for the better part of 4 hours today... no difference between either TB.

[Poyzinous]

Hey Buddy, I'm seconds away from you. Just ask. A New throttle Body is $240

[tollboothwilley]

Read... I have REPLACED my throttle body already.

[SteveTheTech]

Easy there John. Poyzinous is just stating that the information available on most of the websites listing OE ones for over $500 is not the only option for anyone reading this thread with the same issue. There is a factory reman unit that is much more practical option for those who are out of their warranty.

Gabe, We welcome all new members and participation here on Nico.

[tollboothwilley]

Word.

$240 is a decent price. Dealership wanted to charge me $360.

The remanufactured one I found was about $100.

I'm hopefully gonna be able to get to the Nissan dealership that did my 2* timing advance and see if they can adjust it for me while i reset the air idle volume.

[tollboothwilley]

Took my car to the Nissan dealership today. I know a guy who is a Tech. He reset the timing back to 15* BTDC, and tried to relearn air idle volume. No dice. It wouldn't finish the relearn procedure and set.

It could be both TB's are bad???

[4drmadness]

damn sorry to hear tht. did u buy a used throttle body? check out riverside infiniti if you wanna buy a new one. i saw it on ebay for 200

[tollboothwilley]

i've got a friend with a 350z. Gonna test TB and MAF on his car and vice versa on mine. Troubleshoot the problem.

Can't really go out and drive my car hard while the idle is high. I don't want to cause problems.

[tollboothwilley]

SON OF A BATCH!

I've purchased 2 TBs now, so with my own TB thats 3 that will not WORK.

I don't understand why its having such a damn hard time.

I swapped with my friend on his 350Z and using his TB it worked...no problems.

I'm frustrated beyond belief at this point.

Why won't the car sync with the TB?????????????

[4drmadness]

John, how about you take ur friends TB and give him the one u bought and see if it works on his car. That way you can tell if the TB is faulty or not. If the z TB is working, just use his, and give him the new one u bought. Thats the best solution i can come up with right now.

[tollboothwilley]

Well...thats the next step. I just can't figure out for the life of me why his works and all these other 3 TBs are not working.

Gonna try the swap tomorrow...see if the TB i just bought works in his car. If so, put his in my car.

I'm freakin pissed though. btw the copper iso thermal upgrade for the throttle body works good...but it was hell to use the TB spacer with it.

[4drmadness]

btw u can easily sell the other TB'S on the other wevsite

[tollboothwilley]

TB's dont sell very fast....they take a long time

I bought one of these TB's through a vendor after one i bought from a used G didn't work.

If it doesn't work in my friends car, I'm sending it back to them and making them send me one.