Idle Issue after TB cleaning - P0507 - Nissan Frontier Forum
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#1 (permalink) Old 06-28-2010, 10:36 PM
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Idle Issue after TB cleaning - P0507

I am sure there is someone here who can shed some light on this situation as I am beyond frustrated at this point.

A couple of weekends ago my friend and I changed the spark plugs on my 05 vq40. While everything was open, we did the pcv, throttle body bypass, and cleaned the TB. My friend used a TB cleaner and rag and wiped out all of the black build up around the butterfly. My truck was running great until about 2-3 days after the job. Then the trucks starts idling high (1400 rpms) and throws a P0507 code (Idle control system - High RPM). So my friend does some research on some other forums and comes up with some threads on the same problem after cleaning the TB. He found the procedures to do the Accelerator Pedal Release Position Learning, Throttle Valve Closed Position Learning, and the Idle Air Volume Learning. The procedures turned the SES light off and lowered the Idle. Then after 3-4 days, the SES light comes back on and the truck is idling at about 1300-1500 rpms. I have gone the the reset procedures about 5 times now, each turning the light off for about 3-7 days. The 3 procedures seem to fix the idle, as well as turn off the light, but the same P0507 code comes back every time.

I cant figure what could have cause this, and everything done to the truck was mentioned above. There must be someone who has experienced the same problem after cleaning the TB, or someone who has SOME advice as to whats going on. Ive spoke to a local mechanic about this who told me to "go to the dealer, either way money will be spent." I'm a broke college student who cant afford that.
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#2 (permalink) Old 06-28-2010, 11:06 PM
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With a little research that mechanic would have found the TSB for your problem.
read this thread, 03Q45 with DTC P0507 after TB Cleaning : Q45 Forum / Cima Forum

nissan coats to TB to prevent build up. if you're in CA, and under 70K miles, it should be replaced for free. you can also have someone with Superchips, uprev, or hypertech adjust the idle.

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#3 (permalink) Old 06-29-2010, 12:44 AM
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Originally Posted by rcr_kx250f View Post
With a little research that mechanic would have found the TSB for your problem.
read this thread, 03Q45 with DTC P0507 after TB Cleaning : Q45 Forum / Cima Forum

nissan coats to TB to prevent build up. if you're in CA, and under 70K miles, it should be replaced for free. you can also have someone with Superchips, uprev, or hypertech adjust the idle.
Thanks for the reply and link.

So with the protective coating gone (which was removed during the TB cleaning), it is now impossible for the IAVL to be relearned? Also, as it appears, Nissan only replaces TB's, so re-applying whatever was cleaned off wouldn't be an option?

"As the old expression goes; if it aint broke, dont fix it"

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#4 (permalink) Old 06-29-2010, 02:11 AM
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kids will be kids and just wont leave things alone and sometimes it comes and bites them in the a$$. this sucks man, but can i ask why did you think you needed to clean the TB so bad? was it pretty bad?

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#5 (permalink) Old 06-29-2010, 07:19 AM
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wow, I am glad I read this. I have ordered a new air filter and when it arrives I had planned to clean the MAF and the TB.


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#6 (permalink) Old 06-29-2010, 10:32 AM
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I don't think anyone can get the coating. Also, what's the MAF look like?

I work on the dark side. Diesels rule.
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#7 (permalink) Old 06-29-2010, 11:38 AM
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Quote:
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I don't think anyone can get the coating. Also, what's the MAF look like?
check out this thread for more info on MAF Sensor Cleaning


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#8 (permalink) Old 06-29-2010, 01:03 PM
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I just went to Nissan and talked with a mechanic. He is certain the code and abnormal idling is a result of the TB cleaning. He said whatever was used to clean the TB most likely damaged the TPS. Nothing to do with the MAF, pcv system, or vacuum leak. I asked if he could recall the factory service manual stating not to clean the TB, he said no. He said at this point replacing the TB is a matter of whether the idle could be relearned or not.

He was also unfamiliar (never heard of) the 3 re-learn procedures including the IAVL.
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#9 (permalink) Old 06-29-2010, 03:34 PM
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What product did you guys use?

I was planning to use CRC Throttle Body & Air-Intake Cleaner for the TB and their Mass Air Flow Sensor Cleaner for the MAF


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#10 (permalink) Old 06-29-2010, 03:57 PM
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What product did you guys use?

I was planning to use CRC Throttle Body & Air-Intake Cleaner for the TB and their Mass Air Flow Sensor Cleaner for the MAF
I have used that on the TB but never touched the MAF (56k or so now).

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