crappy idle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

DrIvEsldEwAyS · 05-29-2007, 06:27 PM

i have a redtop sr and it normally idles at 850-900 and is consistant. lately its been dropping(650-750) like it wants to cut off then will come back up hold at normal then drop agian. the car is running rich but would that be the cause? any ideas? thanks

redsuns3838 · 05-29-2007, 07:08 PM

could easily be a vac leak. check all vacume lines with a pressure tester (serach for homemade ones or go buy one) thats the most likely problem.

check vac and IC couplings, if thats not it, try cleaning AICV with carb cleaner, they get dirty and cause fluctuating idle.

also, What type of BOV are you running? My blitz leaks and causes fluctuating idle, but not bad enough to replace it yet. If you rev the car in neutral, and the idle drops way low and bounces back up, it could be the BOV.

hopefully its just a leak or aicv tho. bov are $$ =(

corey240 · 05-29-2007, 08:08 PM

wrong thrread maaan

slider2828 · 05-29-2007, 08:45 PM

Yes a car that is running rich will stall the car because you are flooding before you can burn it. Either raise your idle or lower FPR or lower richness through ecu

MomentumGT · 05-29-2007, 08:53 PM

Quote:

Originally Posted by DrIvEsldEwAyS

i have a redtop sr and it normally idles at 850-900 and is consistant. lately its been dropping(650-750) like it wants to cut off then will come back up hold at normal then drop agian. the car is running rich but would that be the cause? any ideas? thanks

This happened to me a couple of times. I just sprayed carb cleaner to clean up my maf and the idle returned to normall. For me it was a crappy/fake kn style filter and dusty roads. Thats after checking for vac and boost leaks.

-Jon

DrIvEsldEwAyS · 05-29-2007, 09:28 PM

i have a hks ssq, and just cleaned my air filter a week or so ago, the car has yet to completely shut off on me but just idles like crap. im putting it on the dyno thursday to back some of the fuel out so we will see if that helps. in the mean time i will check for vac. leaks. thanks for the imput.

s13speeddrft · 05-29-2007, 09:39 PM

also maybe check the injectors..maybe a leaky one.

slider2828 · 05-30-2007, 10:39 AM

Never spray carb cleaner on your MAFS, that will destroy the MAFS for sure. There is actually MAFS cleaner from Kragen, but never use anything that harsh on a mafs.

05-29-2007, 06:27 PM	#1
DrIvEsldEwAyS Zilvia Junkie Join Date: Apr 2005 Location: Columbia,SC Age: 36 Posts: 351 Trader Rating: (0) Feedback Score: 0 reviews	crappy idle i have a redtop sr and it normally idles at 850-900 and is consistant. lately its been dropping(650-750) like it wants to cut off then will come back up hold at normal then drop agian. the car is running rich but would that be the cause? any ideas? thanks __________________ -1990 240sx hatch sr20det- gt35r, blah blah blah

05-29-2007, 08:08 PM	#3
corey240 Zilvia Junkie Join Date: Dec 2005 Location: Cumberland, Maryland Age: 36 Posts: 508 Trader Rating: (2) Feedback Score: 2 reviews	wierd idle problem after hg swap wrong thrread maaan __________________ Email: [email protected]

05-29-2007, 09:28 PM	#6
DrIvEsldEwAyS Zilvia Junkie Join Date: Apr 2005 Location: Columbia,SC Age: 36 Posts: 351 Trader Rating: (0) Feedback Score: 0 reviews	i have a hks ssq, and just cleaned my air filter a week or so ago, the car has yet to completely shut off on me but just idles like crap. im putting it on the dyno thursday to back some of the fuel out so we will see if that helps. in the mean time i will check for vac. leaks. thanks for the imput. __________________ -1990 240sx hatch sr20det- gt35r, blah blah blah

05-29-2007, 09:39 PM	#7
s13speeddrft Zilvia Member Join Date: Mar 2005 Location: orange county/ davis Age: 37 Posts: 235 Trader Rating: (1) Rides Gallery: s13speeddrft Feedback Score: 1 reviews	also maybe check the injectors..maybe a leaky one. __________________ http://s165.photobucket.com/albums/u63/ajhartma/ 1990 240sx hatch....currently monster truck status, with sunken battleships. Junkyard Scavenger

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05-29-2007, 07:08 PM	#2
redsuns3838 Zilvia Addict Join Date: Nov 2004 Location: dog town Posts: 969 Trader Rating: (0) Feedback Score: 0 reviews	could easily be a vac leak. check all vacume lines with a pressure tester (serach for homemade ones or go buy one) thats the most likely problem. check vac and IC couplings, if thats not it, try cleaning AICV with carb cleaner, they get dirty and cause fluctuating idle. also, What type of BOV are you running? My blitz leaks and causes fluctuating idle, but not bad enough to replace it yet. If you rev the car in neutral, and the idle drops way low and bounces back up, it could be the BOV. hopefully its just a leak or aicv tho. bov are $$ =(

05-29-2007, 08:45 PM	#4
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	Yes a car that is running rich will stall the car because you are flooding before you can burn it. Either raise your idle or lower FPR or lower richness through ecu

05-30-2007, 10:39 AM	#8
slider2828 Post Whore! Join Date: Oct 2004 Location: San Francisco, CA Posts: 6,040 Trader Rating: (13) Feedback Score: 13 reviews	Never spray carb cleaner on your MAFS, that will destroy the MAFS for sure. There is actually MAFS cleaner from Kragen, but never use anything that harsh on a mafs.