87 Cold Start Injector Bench Test
Thread Starter
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
87 Cold Start Injector Bench Test
All I can find on testing the cold start injector relates to having it pressurized and checking the spray. Is there any "bench test" VOM data just to see if the coil is good? e.g.- ohms.
Team Owner
Joined: Jul 2004
Posts: 28,327
Likes: 3,242
From: Hartford WI
Please call after noon today since I want him to have as few disturbances so he can get me the replacement for that bad injector that ohmed out just fine.
I have a car down. I really recommend AGAINST the ohm test. It is simple, cheap and really lacking in information about the rest of the injector which makes it misleading. After all, if you are sick, you really don't want your doctor to run a few tests, say "Take 2 aspirins and call me in the morning.", do you? Every injector I have sent for testing and tested myself at the local tech college after a few years of service has come out with reduced flow rates from gunk build up. The last batch of injectors, the mechanic noticed a slight roughness at the stop lights but ran just fine even with the bad injector.
Team Owner
Joined: Jul 2004
Posts: 28,327
Likes: 3,242
From: Hartford WI
I think he also has Multecs so I would send the CSI off for cleaning and testing and toss the Multecs where they belong. In the trash bin.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The injector resistance test only reliably tests those injectors that flow the fuel around the injector coil to cool it. The ethanol in today's fuels dissolves the wire insulation coating and that's when they short out.
My opinion is that an inductance test is a much more valid test, but then few people have an inductance meter (I do).
My opinion is that an inductance test is a much more valid test, but then few people have an inductance meter (I do).
Last edited by Cliff Harris; Aug 26, 2016 at 02:08 AM.
Thread Starter
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
Have several (digital) Capacitance checkers but no induction meter. I got 5.1 ohms as well on the injector coil, but the test leads were 1.3 which gives me a final value of 3.8 ohms. The switch measured 33 ohms. I'm going to guess neither are shorted or open and go ahead and install them.
Team Owner
Joined: Jul 2004
Posts: 28,327
Likes: 3,242
From: Hartford WI
Have several (digital) Capacitance checkers but no induction meter. I got 5.1 ohms as well on the injector coil, but the test leads were 1.3 which gives me a final value of 3.8 ohms. The switch measured 33 ohms. I'm going to guess neither are shorted or open and go ahead and install them.
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Thread Starter
Le Mans Master
Joined: Apr 1999
Posts: 6,134
Likes: 46
From: Raleigh North Carolina
Call the resistance test a "pre-test" if you want. It only takes a few seconds and then you won't waste time setting up the real test. This was the purpose of my original question. I needed to know what to expect in Ohms.
Team Owner
Joined: Jul 2004
Posts: 28,327
Likes: 3,242
From: Hartford WI
I agree that the flow test is the best & correct way to do it.... but you need to pressurize it to flow test it. If the engine is apart, that test will have to wait. My engine is apart, I cannot pressure test. So in the mean time, the resistance test told me that the injector electronics look good and I don't have to source another injector before I start to assemble the engine. Once I have a fuel rail and a fuel pump in service, I can hook the injector up & flow test it.
Call the resistance test a "pre-test" if you want. It only takes a few seconds and then you won't waste time setting up the real test. This was the purpose of my original question. I needed to know what to expect in Ohms.
Call the resistance test a "pre-test" if you want. It only takes a few seconds and then you won't waste time setting up the real test. This was the purpose of my original question. I needed to know what to expect in Ohms.
Team Owner
Joined: Jul 2004
Posts: 28,327
Likes: 3,242
From: Hartford WI
Give Jon a call. Maybe he can walk you through removing the pipe for easier shipping or maybe not. I never had one so not sure but they can clean and test them for you.
Alternatively, you can seal it up and change your programming to spray more fuel, so I have been told.
Alternatively, you can seal it up and change your programming to spray more fuel, so I have been told.