How to ohm test injectors

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Apr 16, 2012 | 10:32 PM

944.0

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From: Camdenton, Mo

Year: 94

Model: Cherokee

Engine: 4.0

How to ohm test injectors

What setting should the multimeter be on? What ohm should I see on my 94 4.0?

Apr 16, 2012 | 10:44 PM

Chewdog167

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Per the JP artical in the April mag use the ohm setting and you should be between 0.95 and 1.2 ohm on the primary circuit and between 11,300 and 13,300 ohm on the secondary. In fact I have to test for a similar prob myself so I've been looking into it and that's the best I've come up with. There was a great write up in Aprils edition on common problems with the 4.0

Apr 16, 2012 | 11:02 PM

Radi

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From: Wisconsin

Model: Cherokee

Quote:

Originally Posted by Chewdog167

Per the JP artical in the April mag use the ohm setting and you should be between 0.95 and 1.2 ohm on the primary circuit and between 11,300 and 13,300 ohm on the secondary.

Those look like typical ignition coil readings. Injectors should read about 12-15 ohms across the two terminals.
Use the lowest setting available that's higher than 15 ohms.

Last edited by Radi; Apr 16, 2012 at 11:16 PM. Reason: correct numbers

Apr 17, 2012 | 12:23 AM

944.0

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Member

Joined: Jan 2012

Posts: 231

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From: Camdenton, Mo

Year: 94

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Radi

Those look like typical ignition coil readings. Injectors should read about 12-15 ohms across the two terminals.
Use the lowest setting available that's higher than 15 ohms.

That's what I thought but was confused when my multimeter didn't read anything. Turns out the internal fuse is blown.