Been awhile, been two years since i had any trouble, now i have no.1 dead. Pulling injector plug off or on has no effect. Every once in a while this car would have a miss at startup when hot, shut off, restart, would be fine. Im thinking injector, any ideas, have one for sale? 91 leg. 2.2 auto Thanks. ed

Check it with an ohmmeter first.

Any idea what kind of readings i should be looking for? Thanks. ed

Sorry I don't know the specification even for my own engine but if there's a short or an open, you'll see right away. If in doubt, maybe you can compare the reading with those for other injectors. Meanwhile, I'll see if FSM has that figure.

Add: it gives a range of 5 to 20 Ohm.

AVK, Thanks. ed

[...]i have no.1 dead. Pulling injector plug off or on has no effect. Every once in a while this car would have a miss at startup when hot, shut off, restart, would be fine. Im thinking injector, any ideas, [...]

Before assuming the injector itself is at fault, see the last section of http://endwrench.com/current/spring04pdfs/InsiderInfo.pdf

(page 30, entitled "Legacy and Impreza Engines with No Injection Pulse #1 Cylinder").

Very interesting, but not looking forward to that!!!!!! Thanks. ed

Very interesting, but not looking forward to that!!!!!!

I can understand that; suppose I could have said "If it turns out the injector itself isn't at fault...".

 

Thanks. ed

You're welcome; I hope it turns out to be something simple.

I dont know if this will help in finding the problem, when it would miss at startup, if i just drove off, it would clear up almost at the time of accleration, almost instantly. ed

You might try a "noid light" to help determine if the injector is getting a switching pulse from the ECU when the problem occurs. It's a "go"/"no-go" test, and can't really tell you pulse width, but that may be all you need in order to determine where to start looking.

You might try a "noid light" to help determine if the injector is getting a switching pulse from the ECU when the problem occurs. It's a "go"/"no-go" test, and can't really tell you pulse width, but that may be all you need in order to determine where to start looking.

You jumped over my head a little with the noid light, is this something to go buy, something i can make? If so what type of bulb? Will an ohm meter work? Thanks. ed

You can certainly troubleshoot with a meter, but noid lights aren't expensive (although for what's in them, maybe they are ), and are relatively easy to use. See:

http://www.google.com/products?hl=en&q=noid+light

Think i could just use a 60 watt light bulb? Just kidding, Not really expensive for what it will tell, Thanks for the link. ed

Seems the injector is ok, I cant get any readings at all coming from the injector plug [connector]. Any ideas what to check next? ed

Tell us what you measured, and how.

 

If the ECU isn't switching #1, you won't be able to measure any voltage between the two pins of the connector. Even so, you should see a steady voltage (13-14 volts with the engine running) from one of the two connector pins to a good ground point (block or chassis). Is that the case?

I went across the leads with an ohm meter, engine off, switch off, no reading what so ever. ed

I went across the leads with an ohm meter, engine off, switch off, no reading what so ever. ed

If you're saying that you measured resistance across the connector with it disconnected from the injector, that won't tell you much. Could you compare that with the reading at a working injector (#2, for example)?

 

What resistance does the injector itself measure? (Comparing resistance of injectors #1 with #2 might also be useful.)

Working on this now, using a digital ohm meter, on the injector it read 1724 not sure if the period made it 1.7 or not, will try here shortly some other readings from other cyclinders. Thanks. ed

Heres whats happening, at idle no 1 is dead, slowly increase rpms, at about 1700rpms engine smooths out jumps to about 2100 rpms , unhook no.1 injector and engine will not smooth out at any safe rpm. If you unplug iac, idle go's up to 1000rpms, wont stall but idles fast, pluged in idle is normal. HELP. Thanks. ed