injector resistance variation
Thread Starter
Oil Producer
Joined: Apr 2014
Posts: 9,363
Likes: 2,734
injector resistance variation
how much variation can there be in order for injectors to be functioning properly in a c4?
example, every cyl is 15.8-16.0 except 7 & 8, which are 11.2 and 14.2 respectively.
Would we expect the 11.2 in cyl to still “run” or would that be enough of a variance to cause major runability issues?
Fwiw, i have checked for injector leakdown, there is none.
Cheers. VT.
example, every cyl is 15.8-16.0 except 7 & 8, which are 11.2 and 14.2 respectively.
Would we expect the 11.2 in cyl to still “run” or would that be enough of a variance to cause major runability issues?
Fwiw, i have checked for injector leakdown, there is none.
Cheers. VT.
Team Owner
Joined: Jul 2004
Posts: 28,372
Likes: 3,260
From: Hartford WI
how much variation can there be in order for injectors to be functioning properly in a c4?
example, every cyl is 15.8-16.0 except 7 & 8, which are 11.2 and 14.2 respectively.
Would we expect the 11.2 in cyl to still “run” or would that be enough of a variance to cause major runability issues?
Fwiw, i have checked for injector leakdown, there is none.
Cheers. VT.
example, every cyl is 15.8-16.0 except 7 & 8, which are 11.2 and 14.2 respectively.
Would we expect the 11.2 in cyl to still “run” or would that be enough of a variance to cause major runability issues?
Fwiw, i have checked for injector leakdown, there is none.
Cheers. VT.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
There IS more. There is a coil inside there. It needs to work. If the resistance is out of whack, that is an indicator the the coil don't work no more. It's a lot easier to check the resistance through the coil, than it is to do the test that you're describing.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Team Owner
Joined: Jul 2004
Posts: 28,372
Likes: 3,260
From: Hartford WI
I don't disagree with that at all. That all said, isn't there more to the injector that the coil? IOW, does "the coil works" equal "the injector is functioning to spec"? If not, perhaps that extra effort is worth something if you want to know the health of the injector and not just the coil.
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Melting Slicks
Joined: Jan 2014
Posts: 2,478
Likes: 254
From: Downers Grove Illinois
If the resistance is low that means part of the insulation is gone on the coil. If for instance the resistance is half of the original value you're only generating a magnetic field with half the coil and the injector is not going to open as fast as it should. One of my injectors was only a third of the resistance and the car still seemed to run fine until I changed them all and was amazed how quickly it started then. If the resistance gets really low you will blow an injector fuse, which is a big problem with the bank fired engines.