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1238 Views 12 Replies 6 Participants Last post by  1wizard!
OK, i thought my opti spark was going out again, but i took the spark plugs out and 2/4/6/8 plugs are dark, and 1,3,5,7 look clean. my car is still stuttering, what could be going on??
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Ohm the injectors and do a fuel pressure leak down.
I agree!
Get yourself (or borrow) a digital volt-ohm meter and unplug each injector one by one and check the resistance value on the injector itself. Do the good side and the bad side so you'll have a reference. I forget what the exact value range is...
Then get a pressure gauge and hook it up to the schrader valve on the fuel rail start the car up and check your pressure. Then after you shut it off watch the pressure gauge closely to see how quickly it drops...if it drops fast you know you have a leaky/faulty injector.

Good luck!
That would be a start. Replace it and then remove the battery cable for a few minutes to clear the codes.

I'd still do the injector ohm test and fuel pressure test just to make sure.

Found this today:
Specs for the injector ohm test should be 16.5 ohms + or - .3
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