tunered Posted October 23, 2007 Share Posted October 23, 2007 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 Quote Link to comment Share on other sites More sharing options...
avk Posted October 23, 2007 Share Posted October 23, 2007 Check it with an ohmmeter first. Quote Link to comment Share on other sites More sharing options...
tunered Posted October 23, 2007 Author Share Posted October 23, 2007 Any idea what kind of readings i should be looking for? Thanks. ed Quote Link to comment Share on other sites More sharing options...
avk Posted October 23, 2007 Share Posted October 23, 2007 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. Quote Link to comment Share on other sites More sharing options...
tunered Posted October 23, 2007 Author Share Posted October 23, 2007 AVK, Thanks. ed Quote Link to comment Share on other sites More sharing options...
OB99W Posted October 23, 2007 Share Posted October 23, 2007 [...]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"). Quote Link to comment Share on other sites More sharing options...
tunered Posted October 23, 2007 Author Share Posted October 23, 2007 Very interesting, but not looking forward to that!!!!!! Thanks. ed Quote Link to comment Share on other sites More sharing options...
OB99W Posted October 23, 2007 Share Posted October 23, 2007 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. edYou're welcome; I hope it turns out to be something simple. Quote Link to comment Share on other sites More sharing options...
tunered Posted October 23, 2007 Author Share Posted October 23, 2007 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 Quote Link to comment Share on other sites More sharing options...
OB99W Posted October 23, 2007 Share Posted October 23, 2007 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. Quote Link to comment Share on other sites More sharing options...
tunered Posted October 23, 2007 Author Share Posted October 23, 2007 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 Quote Link to comment Share on other sites More sharing options...
OB99W Posted October 23, 2007 Share Posted October 23, 2007 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 Quote Link to comment Share on other sites More sharing options...
tunered Posted October 23, 2007 Author Share Posted October 23, 2007 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 Quote Link to comment Share on other sites More sharing options...
tunered Posted October 25, 2007 Author Share Posted October 25, 2007 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 Quote Link to comment Share on other sites More sharing options...
OB99W Posted October 25, 2007 Share Posted October 25, 2007 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? Quote Link to comment Share on other sites More sharing options...
tunered Posted October 25, 2007 Author Share Posted October 25, 2007 I went across the leads with an ohm meter, engine off, switch off, no reading what so ever. ed Quote Link to comment Share on other sites More sharing options...
OB99W Posted October 25, 2007 Share Posted October 25, 2007 I went across the leads with an ohm meter, engine off, switch off, no reading what so ever. edIf 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.) Quote Link to comment Share on other sites More sharing options...
tunered Posted October 25, 2007 Author Share Posted October 25, 2007 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 Quote Link to comment Share on other sites More sharing options...
tunered Posted October 25, 2007 Author Share Posted October 25, 2007 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 Quote Link to comment Share on other sites More sharing options...
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