testing fuel injectors

mudseeker · 04-29-2007, 04:22 PM

how do you test fuel injectors on a fuel rail? i gotta buy a pressure gauge in the morning to see if the pump is working right, but want to test the injectors also. i don't want to replace the injectors unless i need to, they cost 50 to 100 dollars a piece depending on the brand.

this is on a 93 oldsmobile cutlass. it's gonna be the new daily if i can get it running right. can't afford the gas with my hours getting cut, paying for college and the extra miles each week.

436'd skylark · 04-29-2007, 06:00 PM

injectors really don't go bad. they got clogged up full of junk. Is it the 3.1 or 3.3? I'd pull the rail and clean them out, and the rail. Car might need a coil pack. They are notorious for that.

bradrhale · 04-29-2007, 06:08 PM

you got the devils luck with your mama, the truck, and you job. i have questioned how to test injectors and all that anyone has told me is that some shops have them but not many being that it is an extreme specialty tool. cant tell you any more than that. sorry

mudseeker · 04-30-2007, 04:25 AM

it's got the 3.3 in it. the cars been parked in the garage for about 3 years and it just seems to be stumbleing over itself for the last few months. the fuel rail was clean and shiny when i removed the injectors, but there didn't seem to be much fuel coming out of the injectors. i was wondering if i could test the injectors and the harness with a multimeter. it's like junior said, bad things happen in threes.

436'd skylark · 04-30-2007, 06:35 AM

the injector is a small solenoid that opens and closes. it doesn't spray, its only a valve that opens and closes. the pressure in the rail is what shoots the fuel. If you verify the fuel pressure is good, then you likely have a bad crank position sensor or a coil pack. I can't emphasize enough to check fuel pressure on every diagnose problem. I've must of said that two dozen times on this board already..

04-29-2007, 04:22 PM	#1
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 7,155	testing fuel injectors how do you test fuel injectors on a fuel rail? i gotta buy a pressure gauge in the morning to see if the pump is working right, but want to test the injectors also. i don't want to replace the injectors unless i need to, they cost 50 to 100 dollars a piece depending on the brand. this is on a 93 oldsmobile cutlass. it's gonna be the new daily if i can get it running right. can't afford the gas with my hours getting cut, paying for college and the extra miles each week.

04-29-2007, 06:00 PM	#2
436'd skylark Senior Member Join Date: Mar 2007 Location: Pennsyltucky Posts: 1,000	injectors really don't go bad. they got clogged up full of junk. Is it the 3.1 or 3.3? I'd pull the rail and clean them out, and the rail. Car might need a coil pack. They are notorious for that. __________________ Joe 89 K2500 Chevy, Wee-Oh-five 294K miles 1962 Scout 80 parts I guess 1966 Scout 800 resto job 2005 Chevy 2500HD Short cab long box DURAMAX 1996 P30, 6.5 NA Mac Mobile whole lot of buicks

04-30-2007, 06:35 AM	#5
436'd skylark Senior Member Join Date: Mar 2007 Location: Pennsyltucky Posts: 1,000	the injector is a small solenoid that opens and closes. it doesn't spray, its only a valve that opens and closes. the pressure in the rail is what shoots the fuel. If you verify the fuel pressure is good, then you likely have a bad crank position sensor or a coil pack. I can't emphasize enough to check fuel pressure on every diagnose problem. I've must of said that two dozen times on this board already.. __________________ Joe 89 K2500 Chevy, Wee-Oh-five 294K miles 1962 Scout 80 parts I guess 1966 Scout 800 resto job 2005 Chevy 2500HD Short cab long box DURAMAX 1996 P30, 6.5 NA Mac Mobile whole lot of buicks

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04-29-2007, 06:08 PM	#3
bradrhale Senior Moderator Join Date: Apr 2006 Location: Texas Posts: 9,515	you got the devils luck with your mama, the truck, and you job. i have questioned how to test injectors and all that anyone has told me is that some shops have them but not many being that it is an extreme specialty tool. cant tell you any more than that. sorry

04-30-2007, 04:25 AM	#4
mudseeker Senior Moderator Join Date: Feb 2006 Location: michigan Posts: 7,155	it's got the 3.3 in it. the cars been parked in the garage for about 3 years and it just seems to be stumbleing over itself for the last few months. the fuel rail was clean and shiny when i removed the injectors, but there didn't seem to be much fuel coming out of the injectors. i was wondering if i could test the injectors and the harness with a multimeter. it's like junior said, bad things happen in threes.