Injectors failing just while waiting in parts car?

[ScottJackson]

I have a '91 Q for a parts car. I needed some injectors for my '92 and decided to pull the plenum and remove all the injectors from the parts rig and then sort through the good ones and bad ones. The two I needed for my '92 could be accessed without pulling the plenum so I figured it'd be ok to put in the used injectors. Well, the '91 ran when I parked but when I ohm tested the injectors, 6 of the 8 were completely bad. Of the other two, there was one that Ohmed at 43 ohms and one at 11. So I guess one legitimately good one out of 8. I figured I'd use the 43 ohm one cuz it'd probably at least function for now. Anyway, the hood was always on and closed on this parts car since it was parked 3 years ago. Do these injectors fail just from being exposed to humidity/moisture that comes from parking them outside? If so, it seems those cheap $60 remanned injectors that are ohm tested would be a good option since they should be decently well sealed up from the elements when rehabbed. Thoughts?

[elwesso]

i wonder if theyd be worth sending to deatch works and see if they can do anything with them....

[goody90q45]

....it seems those cheap $60 remanned injectors that are ohm tested would be a good option since they should be decently well sealed up from the elements when rehabbed. Thoughts?

I don't think a rehab at Deatchwerks will help unless they are ohming in the 12-13 range (cold). Any higher and the ohms will soon be on their way up and out. I've replaced 4 injectors on my Q and all have followed the same pattern.

Deatchwerks does return rehabbed injectors in a sealed bag with new o-rings and pintle cap installed. They also sell sets of rehabbed injectors for a fair price if you're looking to do all 8. I was very pleased with their service.

I've got two rehabbed injectors in my Q and four ready for use or sale if a member needs one but they are for a 94-96 and not interchangeable with a 90-93. They work fine and are a lot cheaper than new ($170/ea). Good luck.

[ScottJackson]

Yep. As I think Q45tech pointed out, the reman places don't put in new windings and that's what fails. I'm just wondering if they fail due to the plastic cap on top gradually not sealing and therefore letting in moisture. I was thinking that if this is the case, the remanned injectors may be NEARLY as good as new since they're ohm tested and get new caps and such which should prevent them from corroding. Maybe this should be a new topic, but has anyone used the front brake conversion kit for 300zx that puts a 350z track rotor with mitsu EVO 8 caliper on the car? I suppose that'd work fine on the Q, no?

[Q45tech]

Brand new units sit in boxes for 10-15 years.Consider the degradation of gasoline after a few weeks in the tank [after it may be 2-3 weeks old in station tank from day of refinery blending].

Loss of protective rail pressure sitting.

Although we have junkers sitting 6 months before the engine get stripped out.

For the resiatance of a sealed copper coil to change the seal must fail from exposure to non standard gasoline components and heat.........something must get to the point where the copper wire is attached to the spade injector terminal and corrode the internal connection.

I wounder if you could cycle [no more than 50% on off on] voltage to the coil and melt corrosion............need cooling fluid [goddard solvent] to avoid over heats..............what they do in a injector flow bench.

[ScottJackson]

so the fuel in the rails actually comes in contact with the coil winding in the injector? I was picturing moisture getting down into the top of the injector where the two little pins come out and connect to the terminals in the plastic top and corroding into the wires.

[Q45tech]

The fuel doesn't come in contact with the winding unless something in the fuel EATS thru the seals.

[ScottJackson]

AHHHH, I see. So the winding isn't completely closed off to the fuel by metal; there's rubber seals that seal it up internally... which is why there's the connection to ethanol as a suspect in injector failure. Gotcha

[Q45tech]

Nissan has it's own brand of Fuel System Cleaner yet most dealers use BG Products........BG44K

[elwesso]

tech... is there a part number for that stuff??

the bottle its in looks exactly like techron!!!

[Skibane]

I wounder if you could cycle [no more than 50% on off on] voltage to the coil and melt corrosion

Since the resistance is higher than it should be, it would appear that the corrosion is in series with the original circuit path. (Only excessively low resistance would indicate a parallel corrosion path). So, removing existing corrosion wouldn't do anything to reduce the resistance...by itself, anyway.

Pretty hard to replace copper that has already been transformed into something else (oxide, sulphate, etc.) -

[Peterofdevon]

What then (regarding the dangers of potential ethenal issues/injector age/vehicle age should we do to prolong injector life?

What's the best fuel addititve? How often should we use it?

Should we increase fule filter replace intervals?

????

Peter

[greenwar]

Wowie this is scary. I am putting my cars into storage. What should I put in the gas to prevent my injectors from failing.. Fuel Stabilizer?

[Q45tech]

Indolene Clear what the manufacturers uses instead of gasoline to specify HP and MPG is a single formula compound that will be varnish free.

Or just drain the rails and tank and refill system with FRESH gasoline after storage.

[PopPop]

Wowie this is scary. I am putting my cars into storage. What should I put in the gas to prevent my injectors from failing.. Fuel Stabilizer?

Like D said when storing a vehicle for long periods of time always drain the tank and make sure your car has fresh coolant. Coolant can be very damaging to your vehicle if it's old especially during storage. With our G50 injector issues we have to also drain fuel rail. If U can afford a climate control storage it helps with brake system, belts, and tire aging.

[PopPop]

What then (regarding the dangers of potential ethenal issues/injector age/vehicle age should we do to prolong injector life?

What's the best fuel addititve? How often should we use it?

Should we increase fule filter replace intervals?

????

Peter

Pete have you ever seen the inside of your gas tank. It varies from Q to Q depending on up keep. BG44K is very good every other oil change and fuel filter at factory recommended intervals are good enough when using BG44K. I have seen the inside of quite a few tanks and some are crystal clear and others have trash in the bottom.