ka24de misfire and running on three cylinders - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

zsmizzy · 10-21-2010, 10:42 PM

i have a 93 s13 hatch with a stock ka24de motor. for some reason it seems to drop cylinder 2 after it warms up to operating temps and only runs on three cylinders. ive changed the plugs, wires, cap and rotor, and the injector on that cylinder. nothing changed. so today i picked up an ecu and tried that, did the same thing. it seems to dump way to much gas into that cylinder and nothing happens, just smells like gas and gas vapor ends up coming out of the exhaust. after i run it for a bit i can pull the plug out and see gas sitting on top of the piston and if i pull the injector gas sprays out a little bit and is sitting where the injector plugs in. no smoke and compression is good as far as i know. keep in mind it only does it after it warms up to normal operating temps.
any ideas? need to figure this out asap.
thanks

R_G · 10-22-2010, 11:54 AM

always check compression. Motor has to be warmed up in order to do a proper compression check. Make sure injector is not staying open or it's atomizing the fuel properly. GL

zsmizzy · 10-22-2010, 02:57 PM

compression on that cylinder is 150 warm. noid light showed injector pulse is good.

klits562 · 10-22-2010, 04:16 PM

would a leaky or clogged injector cause this only after warm up? This is so weird i cant think of anything that would cause this especially only in one cylinder. Check the resistance of your spark plug wire for that cylinder maybe the wire is damaged?

zsmizzy · 10-23-2010, 08:43 AM

plugs, and wires are good

10-21-2010, 10:42 PM	#1
zsmizzy Join Date: Mar 2010 Location: 22554 Age: 29 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	ka24de misfire and running on three cylinders i have a 93 s13 hatch with a stock ka24de motor. for some reason it seems to drop cylinder 2 after it warms up to operating temps and only runs on three cylinders. ive changed the plugs, wires, cap and rotor, and the injector on that cylinder. nothing changed. so today i picked up an ecu and tried that, did the same thing. it seems to dump way to much gas into that cylinder and nothing happens, just smells like gas and gas vapor ends up coming out of the exhaust. after i run it for a bit i can pull the plug out and see gas sitting on top of the piston and if i pull the injector gas sprays out a little bit and is sitting where the injector plugs in. no smoke and compression is good as far as i know. keep in mind it only does it after it warms up to normal operating temps. any ideas? need to figure this out asap. thanks __________________ - 1993 - 240sx - s13 - hatch - DOHC KA24DE - --zsmizzy--

10-22-2010, 11:54 AM	#2
R_G Zilvia Junkie Join Date: Feb 2010 Location: Monterey Bay/Watsonville Posts: 388 Trader Rating: (0) Feedback Score: 0 reviews	always check compression. Motor has to be warmed up in order to do a proper compression check. Make sure injector is not staying open or it's atomizing the fuel properly. GL __________________

10-22-2010, 02:57 PM	#3
zsmizzy Join Date: Mar 2010 Location: 22554 Age: 29 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	compression on that cylinder is 150 warm. noid light showed injector pulse is good. __________________ - 1993 - 240sx - s13 - hatch - DOHC KA24DE - --zsmizzy--

10-23-2010, 08:43 AM	#5
zsmizzy Join Date: Mar 2010 Location: 22554 Age: 29 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	plugs, and wires are good __________________ - 1993 - 240sx - s13 - hatch - DOHC KA24DE - --zsmizzy--

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10-22-2010, 04:16 PM	#4
klits562 Zilvia Member Join Date: Aug 2010 Location: Norwalk, CA Age: 30 Posts: 152 Trader Rating: (0) Feedback Score: 0 reviews	would a leaky or clogged injector cause this only after warm up? This is so weird i cant think of anything that would cause this especially only in one cylinder. Check the resistance of your spark plug wire for that cylinder maybe the wire is damaged?