Fuel Injector resistance read out.. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

HyperTek · 09-06-2005, 08:17 PM

Hey I need some help.. my #1 piston is out.. im trying to see if its the fuel injectors, what reading should I get off of them with a multimeter? The first injector should have a higher reading then the other 3 right? The other 3 which are working, get a low reading, where as #1 is alot higher.

***FaLKoN240*** · 09-06-2005, 10:20 PM

I think they should all have the same resistance, sounds like you have an open circuit in your first injector. Try getting a new one.

Too much resistance, OL, infinate resistance= an open circuit.

HyperTek · 09-08-2005, 12:01 AM

how the hell do you remove the injectors? Trying to unscrew those phillips head screws seems to strip em.. Do i have to pull the whole fuel rail?

Ritz S14 · 09-08-2005, 12:09 AM

You do not have to remove the fuel rail. If you can, get a cordless drill with a phillips head and with some force, they'll come out like magic. Make sure you get the proper size #2 phillips head.

Once they're out, I like to crank the motor till the injector pops out. Make usre you disable the ditributor by unplugging it. But if you're clumbsy, take it to a shop.

If you want to do a quick cylinder balance test, disconnect the injector 1 by 1. If there's NO change when you disconnect an injector, then that cylinder is at fault. Check for spark/compression/spark plug/and if you smell fuel with teh spark plug removed.

09-08-2005, 12:01 AM	#3
HyperTek Post Whore! Join Date: Mar 2003 Location: Cali Posts: 13,224 Trader Rating: (3) Feedback Score: 3 reviews	how the hell do you remove the injectors? Trying to unscrew those phillips head screws seems to strip em.. Do i have to pull the whole fuel rail? __________________ Keep it Classy

09-06-2005, 08:17 PM	#1
HyperTek Post Whore! Join Date: Mar 2003 Location: Cali Posts: 13,224 Trader Rating: (3) Feedback Score: 3 reviews	Fuel Injector resistance read out.. Hey I need some help.. my #1 piston is out.. im trying to see if its the fuel injectors, what reading should I get off of them with a multimeter? The first injector should have a higher reading then the other 3 right? The other 3 which are working, get a low reading, where as #1 is alot higher. __________________ Keep it Classy

09-06-2005, 10:20 PM	#2
*FaLKoN240* Super Moderator Join Date: Jun 2004 Location: SoCal Temecula Posts: 16,885 Trader Rating: (73) Feedback Score: 73 reviews	I think they should all have the same resistance, sounds like you have an open circuit in your first injector. Try getting a new one. Too much resistance, OL, infinate resistance= an open circuit. __________________ Best way to do business with me? Make your best offer FIRST.

09-08-2005, 12:09 AM	#4
Ritz S14 Post Whore! Join Date: Jul 2004 Location: C A L I F O R N I A Age: 42 Posts: 3,586 Trader Rating: (0) Feedback Score: 0 reviews	You do not have to remove the fuel rail. If you can, get a cordless drill with a phillips head and with some force, they'll come out like magic. Make sure you get the proper size #2 phillips head. Once they're out, I like to crank the motor till the injector pops out. Make usre you disable the ditributor by unplugging it. But if you're clumbsy, take it to a shop. If you want to do a quick cylinder balance test, disconnect the injector 1 by 1. If there's NO change when you disconnect an injector, then that cylinder is at fault. Check for spark/compression/spark plug/and if you smell fuel with teh spark plug removed.