high idle and check engine light issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

stussy240 · 02-18-2010, 04:19 PM

just rebuilt my KA to all stock. The motor runs and starts great but it automatically idles at 2k rpm and climbs to 2500 and stays there after awhile of running. the idle is smooth the whole time also. the check engine light comes on when going up to 2500 and stays on. I believe i have the timing set correctly at 20 when i set it i wasnt sure if the TPS needed to be connected or disconnected. i want to check the engine codes but forgot how to put the ecu into mode 3 so i can read the codes. any help is appreciated. thanks.

fcdrifter20 · 02-18-2010, 07:34 PM

single or twin cam??

jdm213 · 02-18-2010, 07:36 PM

check the MAF

worangejuice · 02-18-2010, 08:12 PM

Simple fixes are Idle adjuster screw on pass. side by firewall, 'wiggle' or mess with MAF, clean,etc., Check the IACV-clean with throttle body cleaner....or the stupid EGR valve...always a problem

supreme_1 · 02-19-2010, 02:10 AM

idle screw on iacv, maf, vac leak, or your throttle cable might be to tight ( the two nuts on the cable might be adjusted to high up) my friend adjusted his to high and couldnt figure out why the car was idling at 2800, make sure your touching the screw.

stussy240 · 02-19-2010, 04:15 AM

dual cam. And thanks for the input. I didn't have time today but I'll let you guys know how it goes and if I need more help. But for setting the timing does it matter to have the tps on or off? And how do you set the ecu to self diagnoistic mode

02-18-2010, 04:19 PM	#1
stussy240 Join Date: May 2009 Location: Canyon Country, Ca Age: 32 Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	high idle and check engine light issue just rebuilt my KA to all stock. The motor runs and starts great but it automatically idles at 2k rpm and climbs to 2500 and stays there after awhile of running. the idle is smooth the whole time also. the check engine light comes on when going up to 2500 and stays on. I believe i have the timing set correctly at 20 when i set it i wasnt sure if the TPS needed to be connected or disconnected. i want to check the engine codes but forgot how to put the ecu into mode 3 so i can read the codes. any help is appreciated. thanks.

02-18-2010, 08:12 PM	#4
worangejuice Zilvia FREAK! Join Date: Nov 2005 Location: WeeeHoooo,CA Age: 41 Posts: 1,519 Trader Rating: (10) Rides Gallery: worangejuice Feedback Score: 10 reviews	Simple fixes are Idle adjuster screw on pass. side by firewall, 'wiggle' or mess with MAF, clean,etc., Check the IACV-clean with throttle body cleaner....or the stupid EGR valve...always a problem __________________

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02-18-2010, 07:34 PM	#2
fcdrifter20 Post Whore! Join Date: Nov 2007 Location: riverside, ca Age: 33 Posts: 2,869 Trader Rating: (44) Feedback Score: 44 reviews	single or twin cam??

02-18-2010, 07:36 PM	#3
jdm213 Zilvia Addict Join Date: Sep 2009 Location: los angeles Age: 31 Posts: 957 Trader Rating: (10) Feedback Score: 10 reviews	check the MAF

02-19-2010, 02:10 AM	#5
supreme_1 Zilvia Addict Join Date: Sep 2007 Location: hawaii Posts: 612 Trader Rating: (12) Feedback Score: 12 reviews	idle screw on iacv, maf, vac leak, or your throttle cable might be to tight ( the two nuts on the cable might be adjusted to high up) my friend adjusted his to high and couldnt figure out why the car was idling at 2800, make sure your touching the screw.

02-19-2010, 04:15 AM	#6
stussy240 Join Date: May 2009 Location: Canyon Country, Ca Age: 32 Posts: 7 Trader Rating: (0) Feedback Score: 0 reviews	dual cam. And thanks for the input. I didn't have time today but I'll let you guys know how it goes and if I need more help. But for setting the timing does it matter to have the tps on or off? And how do you set the ecu to self diagnoistic mode