engine dont want to idle - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Sr20Crazy · 10-11-2011, 09:57 PM

please help ive got a sr20det notch top and it wont crank over after a head gasket was replaced...it has fuel, sparks,and air and will crank and idles at full throttle at very low rpm then when i release it it dies...checked everything like 20 times and its getting everything...timing is right, the cas is lined up, getting spark from the plugs, fuel lines are not crossed, fuel injectors are firing, but still no crank except for when full open throttle...i tried searching and still no luck...PLEASE HELP if u can..thanks

sebastianwrx · 10-11-2011, 09:58 PM

how about maf?

Sr20Crazy · 10-11-2011, 10:04 PM

i was thinking that it can be the MAF, but i have no other maf to test it out with, own couple of fwd det, and when the maf is bad it usually start up fine and quickly idles down and cut out.

sebastianwrx · 10-11-2011, 10:09 PM

u can just try to unplug the wire from the maf ..if the idle become smoother than that for sure its the maf or could be the ground ..that happen to me before after i replaced the IACV

Sr20Crazy · 10-11-2011, 10:36 PM

unplugged the MAF, it crank but doesnt want to start now

Sr20Crazy · 10-12-2011, 05:55 PM

So I use a p10 maf and still the car don't wanna stay on, if I hold the gas pedel down it will stay on at 250 rpm, that's rite 250 rpm.. There's no check engine light and the ecu doesnt have a diagnostic light for me to figure
Out if it's in limp mode... I thought it can be the safc2, but that wasent it either.. So I'm running out of ideas..

*StryfeS13* · 10-13-2011, 12:31 AM

Huge boost leak? Loose intercooler coupler? Leaky o-ring on fuel injector?

Have you checked compression?

Sr20Crazy · 10-14-2011, 03:04 PM

All the intercooler couplings are still intact, I pull off the injectors and all the I rings are still good, no rips at all... And still I'm sump....

Sr20Crazy · 10-14-2011, 09:07 PM

Update: so after checking all the work and reading on other forms: I completely took of the iacv and ran the car, it stays on idling at 500 rpm but no throttle response. So I'm thinking that it can be the iacv but they go for $300. And i don't want replace it with the new one and it doesnt work. So any one encouter this before? I clean the iacv ran the car with it off, and still it's the same..

10-11-2011, 09:57 PM	#1
Sr20Crazy Leaky Injector Join Date: Jun 2009 Location: Minnesota, San Diego, Japan Posts: 55 Trader Rating: (1) Feedback Score: 1 reviews	engine dont want to idle please help ive got a sr20det notch top and it wont crank over after a head gasket was replaced...it has fuel, sparks,and air and will crank and idles at full throttle at very low rpm then when i release it it dies...checked everything like 20 times and its getting everything...timing is right, the cas is lined up, getting spark from the plugs, fuel lines are not crossed, fuel injectors are firing, but still no crank except for when full open throttle...i tried searching and still no luck...PLEASE HELP if u can..thanks

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10-11-2011, 09:58 PM	#2
sebastianwrx Zilvia Junkie Join Date: Oct 2009 Location: fresno,CA Age: 35 Posts: 493 Trader Rating: (18) Feedback Score: 18 reviews	how about maf?

10-11-2011, 10:04 PM	#3
Sr20Crazy Leaky Injector Join Date: Jun 2009 Location: Minnesota, San Diego, Japan Posts: 55 Trader Rating: (1) Feedback Score: 1 reviews	i was thinking that it can be the MAF, but i have no other maf to test it out with, own couple of fwd det, and when the maf is bad it usually start up fine and quickly idles down and cut out.

10-11-2011, 10:09 PM	#4
sebastianwrx Zilvia Junkie Join Date: Oct 2009 Location: fresno,CA Age: 35 Posts: 493 Trader Rating: (18) Feedback Score: 18 reviews	u can just try to unplug the wire from the maf ..if the idle become smoother than that for sure its the maf or could be the ground ..that happen to me before after i replaced the IACV

10-11-2011, 10:36 PM	#5
Sr20Crazy Leaky Injector Join Date: Jun 2009 Location: Minnesota, San Diego, Japan Posts: 55 Trader Rating: (1) Feedback Score: 1 reviews	unplugged the MAF, it crank but doesnt want to start now

10-12-2011, 05:55 PM	#6
Sr20Crazy Leaky Injector Join Date: Jun 2009 Location: Minnesota, San Diego, Japan Posts: 55 Trader Rating: (1) Feedback Score: 1 reviews	So I use a p10 maf and still the car don't wanna stay on, if I hold the gas pedel down it will stay on at 250 rpm, that's rite 250 rpm.. There's no check engine light and the ecu doesnt have a diagnostic light for me to figure Out if it's in limp mode... I thought it can be the safc2, but that wasent it either.. So I'm running out of ideas..

10-14-2011, 03:04 PM	#8
Sr20Crazy Leaky Injector Join Date: Jun 2009 Location: Minnesota, San Diego, Japan Posts: 55 Trader Rating: (1) Feedback Score: 1 reviews	All the intercooler couplings are still intact, I pull off the injectors and all the I rings are still good, no rips at all... And still I'm sump....

10-14-2011, 09:07 PM	#9
Sr20Crazy Leaky Injector Join Date: Jun 2009 Location: Minnesota, San Diego, Japan Posts: 55 Trader Rating: (1) Feedback Score: 1 reviews	Update: so after checking all the work and reading on other forms: I completely took of the iacv and ran the car, it stays on idling at 500 rpm but no throttle response. So I'm thinking that it can be the iacv but they go for $300. And i don't want replace it with the new one and it doesnt work. So any one encouter this before? I clean the iacv ran the car with it off, and still it's the same..