Posted: 5/20/2011 2:19:14 PM EDT
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SWMBO appears to have a bad injector on her daily driver. It's a 95 Isuzu Trooper with 96K miles on it. 3.2L SOHC. A single injector is around $130, so I'm not inclined to replace them all. I was searching the interweb for ideas on diagnosing the individual injectors when I came across the video below. I already have the syringe body and a 12V power supply. All I'd need is a momentary switch and some alligator clamps. What do you think?  |
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Quoted: Have you run two or three bottles of Techron through a half tank of premium to see if you can clean it out first? I did run a bottle of Sea Foam through half a tank. It improved a little, but the miss is still there under load. ETA - I think I'm going to try it. I don't have much to lose - I need to take it all apart either way, and if the method in the video works I'll save myself enough to pay for a decent in-lb torque wrench, which I should have for working on this rig anyways. Gaskets & o-rings for the job are just under $40. So I'll be out the cost of a momentary switch, alligator clips and a can of carb cleaner. I'll post an AAR Sunday. |
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A lot of injectors go out due to the high resistance in the windings and clogging isnt the problem.
Ohm it out first to make sure its in specs, hot and cold if it is you can also smack the injector with a screwdriver handle and that sometimes will clear the rust or dirt enough to make it work. My bet is on it shorting out. Nissan are the worst |
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Been working on cars 20+ yrs. I dont think that is going to do much for you. Waste your time is all. Fuel pressure running to the injector is more than 40lbs psi. Spray can is no where near that.
Get a noid light and make sure the ecm is firing the injector before you replace it. |
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Not sure about torque wrench. Probably whatever the local NAPA has on hand, assuming they have one on hand. If it doesn't work, it should at least help me to identify the bad injector. I certainly hope it's not an ECM issue. Giving them all a swat with a screwdriver isn't a bad idea, either.  |
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Quoted:
I wouldn't do it if I were you. I attempted something similar (even though I have an OTC fuel injector cleaner setup here). Major rust shut city on the injectors that I attempted it on. Most of them were salvagable, but 1/6 needed to be replaced after that. Why would it rust the injectors, carb cleaner isn't real corrosive? |
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1) I didn't put them back on the car right away, and I didn't fill the insides with oil afterward
2) as it was explained to me, firing stuff like that (raw) down in there is like soaking an abraded piece of metal in denatured alcohol. its not so much the cleaner itself, but the opportunity offered. |
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Quoted: Quoted: I wouldn't do it if I were you. I attempted something similar (even though I have an OTC fuel injector cleaner setup here). Major rust shut city on the injectors that I attempted it on. Most of them were salvagable, but 1/6 needed to be replaced after that. Why would it rust the injectors, carb cleaner isn't real corrosive? They pick up rust and debris from the fuel rail and it farks them up. I had one on my Silverado go out and it was full of rusty sand type junk.. |
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Quoted: It will work in a pinch, but you really need them cleaned right.SWMBO appears to have a bad injector on her daily driver. It's a 95 Isuzu Trooper with 96K miles on it. 3.2L SOHC. A single injector is around $130, so I'm not inclined to replace them all. I was searching the interweb for ideas on diagnosing the individual injectors when I came across the video below. I already have the syringe body and a 12V power supply. All I'd need is a momentary switch and some alligator clamps. What do you think?  http://www.youtube.com/watch?v=VFJlTfHyrUkGet a complete set of cleaned, warranty injectors here cheaper than the cleaning of one. http://www.southbayfuelinjectors.com/ This is where I bought 8 for my 383 TPI '87 Monte Carlo. Works great! |
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Here is a place that will test and clean them for you for $20 each
http://www.witchhunter.com/index.php4 |
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Quoted: Gas and electricity, what could go wrong? I'd wear bunker gear, actually, I'd let an adult with knowledge do it.  If I kaboom myself or burn down the garage, I'll post pics. I will be putting the cleaned injectors right back into the engine, but I guess that if you weren't going to do that you could spray some WD-40 or similar light lube/protect stuff in there to prevent corrosion. FWIW, I don't plan on spraying WD-40 through my injectors but I'm not sure it would hurt anything to do so. |