weird idling problems

smoothtransit · 12-05-2014, 12:50 PM

Hey guys,

So i just recently purchased my Z and everything has been going fine. But yesterday a slight problem popped up regarding high rev idling. When the car
gets into neutral the rpm hang at around 1500. This is after 15 min of driving. my sport mode (syncro rev match) doesnt seem to affect it either as it occurs when it is off as well.. Its a 6mt btw. One time while it was hanging at a stop i just slightly tapped the accelerator and the rpm dropped to normal 650. I have NO idea whats going on. Can someone help?

Thanks

TerribleONE · 12-05-2014, 12:50 PM

Quote:

Originally Posted by smoothtransit

Hey guys,

So i just recently purchased my Z and everything has been going fine. But yesterday a slight problem popped up regarding high rev idling. When the car
gets into neutral the rpm hang at around 1500. This is after 15 min of driving. my sport mode (syncro rev match) doesnt seem to affect it either as it occurs when it is off as well.. Its a 6mt btw. One time while it was hanging at a stop i just slightly tapped the accelerator and the rpm dropped to normal 650. I have NO idea whats going on. Can someone help?

Thanks

Does the car have any mods? Has it ever been tuned?

smoothtransit · 12-05-2014, 12:57 PM

Quote:

Originally Posted by TerribleONE

Does the car have any mods? Has it ever been tuned?

So im not sure if it has ever been tuned but it does have a Stillen CBE. Whats weird is that it wasnt having this issue for the first week and half.

TerribleONE · 12-05-2014, 12:58 PM

Quote:

Originally Posted by smoothtransit

So im not sure if it has ever been tuned but it does have a Stillen CBE. Whats weird is that it wasnt having this issue for the first week and half.

How many miles? Try cleaning the MAFs and throttle bodies. Did you get a CEL?

smoothtransit · 12-05-2014, 01:00 PM

about 48,2xx miles. No CEL however.. I was thinking it might have something to do with the MAF sensors but wasnt sure

smoothtransit · 12-05-2014, 01:38 PM

I was gonna ask, do you think it could be an airfilter issue?

SouthArk370Z · 12-05-2014, 02:40 PM

Quote:

Originally Posted by smoothtransit

I was gonna ask, do you think it could be an airfilter issue?

When in doubt, change 'em out. Air filters are easy to access and aren't that expensive.

If that doesn't line things out, I'd try TerribleONE's clean-the-MAFs suggestion. Another cheap (can of MAF cleaner) and easy (two small bolts per MAF, no gasket to replace) job.

If the MAFs are visibly dirty it'd be a good idea to clean the TBs but that's a harder job that may require some recalibration if you mess up.

smoothtransit · 12-05-2014, 03:24 PM

Quote:

Originally Posted by SouthArk370Z

When in doubt, change 'em out. Air filters are easy to access and aren't that expensive.

If that doesn't line things out, I'd try TerribleONE's clean-the-MAFs suggestion. Another cheap (can of MAF cleaner) and easy (two small bolts per MAF, no gasket to replace) job.

If the MAFs are visibly dirty it'd be a good idea to clean the TBs but that's a harder job that may require some recalibration if you mess up.

Cool, appreciate both your help

Justice97 · 12-05-2014, 03:58 PM

Quote:

Originally Posted by SouthArk370Z

When in doubt, change 'em out. Air filters are easy to access and aren't that expensive.

If that doesn't line things out, I'd try TerribleONE's clean-the-MAFs suggestion. Another cheap (can of MAF cleaner) and easy (two small bolts per MAF, no gasket to replace) job.

If the MAFs are visibly dirty it'd be a good idea to clean the TBs but that's a harder job that may require some recalibration if you mess up.

If you clean your TBs don't unplug them. I did mine and all my idle issues went away.
Use a lot of rags under them. I rotated intake down with rags everywhere. Spray cleaner and use a lot of q tips to get it all out.

Unplugging them is when you require recal. It isn't a big deal and I know somewhere on this forum there are detailed instructions on how to do it. I chose the not unplugging method. Worked great for me. Also clean the MAP sensor as well.

smoothtransit · 12-05-2014, 04:37 PM

Quote:

Originally Posted by Justice97

If you clean your TBs don't unplug them. I did mine and all my idle issues went away.
Use a lot of rags under them. I rotated intake down with rags everywhere. Spray cleaner and use a lot of q tips to get it all out.

Unplugging them is when you require recal. It isn't a big deal and I know somewhere on this forum there are detailed instructions on how to do it. I chose the not unplugging method. Worked great for me. Also clean the MAP sensor as well.

okay thanks. Did you happen to have any similar issue? or did you clean them for another issue/maintenance?

DOOMMONKEY777 · 12-06-2014, 07:23 PM

I had TB problems, my rpm kept dropping, this issue is different i remember some one from this forum had this problem, until they reset the ecu. Ahh and check ur TB connections could be loose. GL OP.

synolimit · 12-06-2014, 09:38 PM

Just clean everything first. Take the TB's off, it's really not that hard. If the idle isn't fixed just google TB reset procedure. What it sounds like though is a air leak. Check your hoses for cracks or leaks. I'm betting your plastic elbows behind the MAF sensors in the post MAF tube might be cracked like they do on most.

12-05-2014, 12:50 PM	#1 (permalink)
smoothtransit Base Member Join Date: Dec 2014 Location: Seattle Posts: 63 Drives: 09 370 BS 6mt Rep Power: 11	weird idling problems Hey guys, So i just recently purchased my Z and everything has been going fine. But yesterday a slight problem popped up regarding high rev idling. When the car gets into neutral the rpm hang at around 1500. This is after 15 min of driving. my sport mode (syncro rev match) doesnt seem to affect it either as it occurs when it is off as well.. Its a 6mt btw. One time while it was hanging at a stop i just slightly tapped the accelerator and the rpm dropped to normal 650. I have NO idea whats going on. Can someone help? Thanks

12-06-2014, 07:23 PM	#11 (permalink)
DOOMMONKEY777 A True Z Fanatic Join Date: Sep 2010 Location: Crooklyn Posts: 1,014 Drives: 370Z 6psd-sport-pkg Rep Power: 21	I had TB problems, my rpm kept dropping, this issue is different i remember some one from this forum had this problem, until they reset the ecu. Ahh and check ur TB connections could be loose. GL OP. smoothtransit likes this. __________________ Kids don't do Drugs, Drugs are bad, so let the professional druggies do Drugs for you. 537whp/496lb/tq@8-9PSI 93 octane

12-06-2014, 09:38 PM	#12 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3390	Just clean everything first. Take the TB's off, it's really not that hard. If the idle isn't fixed just google TB reset procedure. What it sounds like though is a air leak. Check your hoses for cracks or leaks. I'm betting your plastic elbows behind the MAF sensors in the post MAF tube might be cracked like they do on most. JWillis72 and smoothtransit like this. __________________ 13 370z-

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12-05-2014, 01:00 PM	#5 (permalink)
smoothtransit Base Member Join Date: Dec 2014 Location: Seattle Posts: 63 Drives: 09 370 BS 6mt Rep Power: 11	about 48,2xx miles. No CEL however.. I was thinking it might have something to do with the MAF sensors but wasnt sure

12-05-2014, 01:38 PM	#6 (permalink)
smoothtransit Base Member Join Date: Dec 2014 Location: Seattle Posts: 63 Drives: 09 370 BS 6mt Rep Power: 11	I was gonna ask, do you think it could be an airfilter issue?