Hey guys Im having a problem with my injectors in my 87 t/a 305. I ohm tested them and when hot they read 17 to 18. When engine cold they read 30 to 33. I'm not to sure what that means them being so high? If any one can help I would be appreciative. Thanks!

 

The car is also running lean and I'm only getting about 160 to a full tank. This is why I'm thinking injectors. I've replace alot of things try to fix it . So if any one could please help.

 

Its also runnig lean and only getting about 160 miles to full tank. It will also idle up and down when car is hot at a stop in drive. I've replaced alot of stuff already. Now I'm at the injectors. So can anybody help. Thang again

 

Doesn't sound right at all.

An injector is nothing more than an electromagnet that opens a valve. An electromagnet is nothing more than a coil of wire (usually copper) wound around a magnetic material (usually iron). The physical properties of copper make it impossible for it to behave as you report. Its resistance increases when it heats up, and decreases when it gets cooler. Just being part of a "car" doesn't repeal the laws of physics or endow the material with properites at variance with the properties of the same material when not part of a "car".

There is an error in your measurement; somehow, somewhere, some way.

I could see an injector behaving like that, from having a bad connection internally, or the like; but not all 8. This would require some serious suspension of the laws governing this universe.

What did your ohmmeter read when you shorted the leads?

See my signature for a bit of advice about logic.

 

I read on Line that you set it on ohms 2000 or 2k . Is that correct?

 

Ok so re checked them hot and cold and put ohm meter on 200 and they were all 17.5 to 18. Which is still high and not in spec. What does it mean to get high readings?

 

What did the meter read when you just touched the leads together, on the 200 ohm range?

 

The resistance of a winding will reduce with heat if the insulating resin has deteriorated so that as the copper windings heat up and expand, they begin to make contact, thus reducing the effective number of coils in the winding. This is why we see injectors that seem to function normally when cold then go flat as the engine warms up.

You can see it happen by monitoring injector pulse with a lab scope on a car with failing injectors. As the engine warms up, the inductive spike deteriorates due to low impedance in the injector coils. We then test the hot injectors that tested okay cold and find that they've dropped several ohms.

The odd part of this thread is that magnetic coils don't generally just increase in resistance. They may break and become open, but they dont gain several ohms. At least not in my experience. That's why I agree that something is wrong with the OP's test results.