If a spark plug wire was arcing, could it take out an injector?

 

No. With the arcing, you'd probably just get hesitating upon acceleration, or hard starting in cold weather. Check your injector connections and make sure they're clean, and if you do need to replace them, replace all 6, because if you replace 1, the funny thing is that another one will go or in tandem.

 

if it was arcing onto the injector it could, but I doubt that's happening.

 

Check the wires harnesses going to the fuel injectors, Mine were rotted/cracked and shorting out. I could wiggle the wire while car was running and it would shake and studder. Replaced the harness and no more problems.

 

eh heh heh.... here's a silly question.... what do injectors look like? Or where are the connectors and that thing to test the voltage of them? I don't see anything in haynes, going to try searching on the boards a little more...

 

Look on each side of the valve covers near where the spark plug wires go down to attach to the spark plugs. There are 3 on each side of the engine. Two wires that end in a small retangular shaped harness that snaps into another recepticle. Only other wires that are attaching in this area really, besides the plug wires. Course, my experience is with the VG and I've forgotten what you have so yours could be slightly different. But if you wiggle that wire, usually there will be an old dried out insulation boot where it will short out and cause the injector not to fire or spray.

 

Oh yeah, when the mechanic replaced one of the injectors($600 for one, $1100 for all 6(didn't/don't have that kind of money)), two of them broke and he replaced those for $15 a peice. I was trying to check one a little before that, and the rubber is terribly brittle.
thanks for the help(hopefully it'll do something)!

 

I got new universal harnesses from an import shop, they were basically the same but the groove that fits the notch on the injector was in a slightly different place so I had to snip part of the plastic harness to make it fit. Mine was like $15 or so a piece and I did all six, just cut the old one off but checed to see which wire went to which of the two prongs on the fuel injector end, so I could resolder the new harness in in the same manner. I used good electrica tape and some small diamter wire loom to protect my splice. It made a huge difference, like I said you could wiggle the wire and the car would start running really rough.

 

My car ran perfect. A little slow, some hesitating off the line, but besides that perfect. 2k miles after I got it, I changed the spark plugs. Now it runs terrible. Loss of power, engine shakes, exhaust comming out in obvious "putt-putt" gasps, no steady flow. What could I have done? And then, a month later(after getting the engine mounts changed), an injector dies. #5. Got that one replaced, new fuel filter and an engine cleaning.
It made the car a little more "peppy", but the problem was still there. Vibration, exhaust comming in the same gasps of exhaust(smokes every now and then). And then it got a little worse. It doesn't do it as bad untill the car realizes it's warmed up. Then, "putt-putt-putt", (and convulsions).
What could I have done? I checked the injector connectors, it doesn't change when I wiggle them. I don't know where to check the ohms, but fuel injector cleaner doesn't do anything, I've been running straight 91 gas since I bought it. So it's not a clogged injector, whats the next step? The plug wires seem good, waiting untill dark to make sure they don't arc, but what should I do??
How much should it cost you to get your plugs changed with NGK(mechanic said $40)?

 

how do you know this?? just cause you run 91 octane...HA, that doen't mean crap. injectors can still clog up if you were running 103!!! you are making too may assumptions...your best bet is to replace ALL the injectors, and if this problem keeps persisting just take it to Nissan for God's sake, if you can't solve the prob yourself have someone else do it.

 

I just spent the last 15 min deleting your 2x posts and merging your seperate posts that ask the same damn thing.

Go ahead, keep it up.

 

I don't mean to waste your time, but the problem on the car is getting progressively worse, so every time I find something new through the search(I.E, "arcing", whats an injector, how to test, where, ect), I post. I still haven't found anything in detail of how to test the injectors except to use a voltometer to test the resistance(like how do I get to them? or do I just test the wires comming off the "injector plug"? And if so, how can I take them off with out breaking the old brittle stuff?[and if I replace the wire, how do I do a good job, trying to sauder two wires together on the garage floor and they wouldn't stay together, how bad will it be sitting over the engine?)
I didn't find any real detail through the search, just the faq's, but not about injectors...

 

Testing injectors:
1) Use a voltmeter to test ohm load
2) Disconnect them one at a time(if you can reach them while the car is running) to see if the car gets worse(good injector) or not(bad injector) Same test for the plug/plug wires
3) Take it to Nissan have them run the injectors though their Consult.

Make sure the connections are clean. There should be a procedure to check the injector harness also. YOU DO HAVE A NISSAN FSM CORRECT? AND YOU ARE USING THE STICKIES CORRECT?

It might be time to hand this over to a mechanic because it's hard to know if you have done all the previous stuff right.

 

Ok, thanks. I have taken it to the mechanic before, spent $500 on new engine mounts, and $200 to check over the birations, and clean it out, which still didn't take it away. Two weeks later an injector failed, had to get it replaced, but didn't have the $1100 to get a 6 replaced. I'll call up the nissan dealership tonight and try to get an estimate on how much it'll cost to have them take a look at it. (I spent 2k on transmission a month after I bought it)
Ok, I found out what the FSM is(Factory Service Manual), but no, I don't have one. Would it be more helpful then the haynes? Is the place to pick one up at the nissan dealership? Are the stickies the messages that are on the top of the board, the faqs and such?(I just found detailed injector information for testing on bryans page)

 

My car's got the same problem- I fixed it myself a while ago and now its back (I guess its true about how they go out a couple at a time). I would recommend that you just get all of the injectors replaced- or at least replace the bad one (sounds like it might be spraying wide open- again like mine was) and send the rest out to get blueprinted and reconditioned if its cheaper. That's all if you plan on keeping the car- sounds like its been a money sink for you.

 

Ok Jeff, I give up....what are the "stickies"

I can't sleep.....

Martin 90 SE 5sp

 

They're the things at the top with "Important:" in front of the thread title.