Injector Impendance Question???
Thread Starter
Instructor
Joined: May 2006
Posts: 217
Likes: 0
From: Westchester NY
Injector Impendance Question???
Is the impendance in a 1992 corvette LT1 injector low or high??? I do not have testing equipment, and can you use either one on your car or no???
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
Your car uses a high impedance injector.. DO NOT try to use a low z injector or your ECM will be trash.. What are you trying to do anyway?
Safety Car
Joined: May 2002
Posts: 4,010
Likes: 26
From: Somewhere nowhere
Your ECM will NOT be trashed. The injector drivers are protected. It's standard engineering practice to fuse protect any sort of driver.
Let's say the harness grounds out, should you have to replace your ECM?? Of course not.
But yes, our cars are high impedance injectors.
and the testing equipment is a standand DVM (meter).
you can get a cheap one for < $20.
Let's say the harness grounds out, should you have to replace your ECM?? Of course not.
But yes, our cars are high impedance injectors.
and the testing equipment is a standand DVM (meter).
you can get a cheap one for < $20.
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
...and with a DVM, you will be measureing the resistance, not impedance, across the 2 terminals going into each injector. You want to ensure that you have close ohm'age readings between the 8 injectors..
Not sure what the spec's are for a 92 injector, but my '95 measures around 15 ohm's on a cold engine.
Not sure what the spec's are for a 92 injector, but my '95 measures around 15 ohm's on a cold engine.
Thread Starter
Instructor
Joined: May 2006
Posts: 217
Likes: 0
From: Westchester NY
Im asking because I bought 8 low impendance Bosh 280-150-403's without knowing that they are low impendance and now I will have to send them back and change them for high impendance ones. Thanks guys for the help, I really appreciated.
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
Your ECM will NOT be trashed. The injector drivers are protected. It's standard engineering practice to fuse protect any sort of driver.
Let's say the harness grounds out, should you have to replace your ECM?? Of course not.
But yes, our cars are high impedance injectors.
and the testing equipment is a standand DVM (meter).
you can get a cheap one for < $20.
Let's say the harness grounds out, should you have to replace your ECM?? Of course not.
But yes, our cars are high impedance injectors.
and the testing equipment is a standand DVM (meter).
you can get a cheap one for < $20.
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
What is the purpose? Measuring d.c. resistance is almost worthless. It will find gross injector coil errors, but the injectors work on pulses, not long periods of direct current. A coil with an adjacent turn to turn short cannot be found with an ohmeter, but it can easily be found with an impedance bridge.
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Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
What is the purpose? Measuring d.c. resistance is almost worthless. It will find gross injector coil errors, but the injectors work on pulses, not long periods of direct current. A coil with an adjacent turn to turn short cannot be found with an ohmeter, but it can easily be found with an impedance bridge.
