G50 Fuel Injector/ECU issue

[LuckyRps13]

So I have 2 injector plugs that have killed 5 injectors between them. when the first ones went they were replaced by Remanufactor plugs by the pervious owner. he clamed that the car ran fine for a few days then went back to the way it was. This is how i picked the car up cheap. so that account for 4 injectors. The bad cylinders are 2 and 4. i swaped the injector from cylinder 1 to cylinder 2. that injector died after a few days. my thought is that the ECU is killing then by sending the wrong voltage/signal to them. I am new to the VH45 motor so i am not sure if this is a common problem with the ECU or some thing else inline to the injectors. I have searched and seen that the VH likes to eat up fuel injectors but they should last more than a few days lol. Any positive insight would be great. If i can not straighten out the issue i will part the car out.

[qship96]

your diagnosis makes no sense whatsoever.Injector plugs can NOT "kill" an injector,nor can swapping locations of injectors cause the ECU to "kill" them by sending the wrong "signal" or voltage to them......my suggestion is to get the car in the hands of a professional for proper diagnosis and repair,before YOU kill it with your lack of basic understanding of how it operates.Plan on spending a minimum of $2000-3000 to fix this issue, if that scares you,sell the car quick,because it is just the beginning.

[LuckyRps13]

Nope not scared. seems kinda odd that the same plug has killed 2 reman injectors in a very short time after installation. I.E. a day or 2 after being installed. I won't be putting the car in a shop, i can turn the wrenches all by myself. I have built and worked on many motors, and I have never seen this sort of issue come up before on any thing. The costs to replace all the injectors, the intake manifold gaskets, spark plugs, and a fuel filter will run about $1100. but i am guessing you are accounting for paying for labor. No reason to throw away $2000 of my hard earned cash when i can do it myself after finding a common issues on the internet to work from.



I do not see any diagnosis any where in my OP. If i did post a self diagnosis why would i be posting any thing. I do see an account of what has been going on. And assumption of what the issue could be from the pattern of events that has happen in the same positions. I do not see it a stretch of any imagination that an ECU that could be going out and sending too much amperage/voltage to any give pin out and over loading it to the point of failure. Could even be a short in the line or maybe some thing else that is in line between the ECU and the injectors. I have not had the time to put a multi meter on it to see what is going on there. You could try and be helpful by say what information you do know first hand about this motor. But by popping off with take to a shop and telling me i do not have a clue is not helpful at all. So I ask that if you have any insightful information please post on what YOU DO KNOW, other wise please do not bring any negativity to my thread. Thank you in advance for any information that helps solve this issue.

[goody90q45]

When you say the injectors are dying are they ohming within range, 10-14 ohms, when you install them and out of range (>14) a few days later? Or are they plugging up and not functioning but still ohming within range? Are the connector and the pins on the FI corrosion-free? How's the fuel filter? I replaced 6 FI, one at a time, plenum removal for each one, on a 90Q that I previously owned so you're not alone. Used injectors can be a crapshoot, especially if they came out of a Q that had been sitting for a while soaked in fuel.

Don't fuss too much about Qship. Whether we agree or disagree with his opinions, his rants have caught the attention of at least one of the mods and after today's posts may be on vacation very soon.

[qship96]

Nope not scared. seems kinda odd that the same plug has killed 2 reman injectors in a very short time after installation. I.E. a day or 2 after being installed. I won't be putting the car in a shop, i can turn the wrenches all by myself. I have built and worked on many motors, and I have never seen this sort of issue come up before on any thing. The costs to replace all the injectors, the intake manifold gaskets, spark plugs, and a fuel filter will run about $1100. but i am guessing you are accounting for paying for labor. No reason to throw away $2000 of my hard earned cash when i can do it myself after finding a common issues on the internet to work from.



I do not see any diagnosis any where in my OP. If i did post a self diagnosis why would i be posting any thing. I do see an account of what has been going on. And assumption of what the issue could be from the pattern of events that has happen in the same positions. I do not see it a stretch of any imagination that an ECU that could be going out and sending too much amperage/voltage to any give pin out and over loading it to the point of failure. Could even be a short in the line or maybe some thing else that is in line between the ECU and the injectors. I have not had the time to put a multi meter on it to see what is going on there. You could try and be helpful by say what information you do know first hand about this motor. But by popping off with take to a shop and telling me i do not have a clue is not helpful at all. So I ask that if you have any insightful information please post on what YOU DO KNOW, other wise please do not bring any negativity to my thread. Thank you in advance for any information that helps solve this issue.

my point is a "faulty" injector plug {connector} cant kill an injector....it either passes the voltage through it as designed, or it doesnt due to a short,or corrosion buildup-either condition will not destroy an injector. The ECU does not "create" voltage,it only sends battery voltage to each injector at the correct time and for the correct duration,and again cant "kill" an injector.Injectors fail from being exposed to tremendous heat over time under the plenum,and the plastic bodies become brittle and crack,allowing fuel to enter the windings and destroy them.'rebuilt" injectors are quite often a crapshoot,as they are in reality just cleaned up used injectors,there is no way to actually rebuild the electrical windings and internal solder connections-which is what eventually kills the injectors,especially on old Q.

[LuckyRps13]

I have not checked the ohms yet. According to the pervious owner he replaced all 8 with remans from a parts store that are all out of warrenty now.

All conections are corrosion free. I even cleaned those conections with electrical system cleaner from Autozone for good measure.

Fuel filter condition is unknow and will be replaced this weekend, along with the remaining 6 spark plugs i have not changed yet for good measure.

[goody90q45]

#1 and #2 FI are simple to ohm test directly on the injector pins. If they're still ohming in range try a bottle of Redline S1 fuel system cleaner in a 1/2 tank of gas to see if they clean up and operate properly.If you can't find Redline (Pep Boys/Napa AP) try Techron fuel system cleaner from a Chevron station or parts store.

The rest of the injectors can be tested at the harness connector on the passenger side of the plenum.

[LuckyRps13]

I will give that a try.

I found the picture where to find the pin outs on the harness. thank you for the usable input.

[LuckyRps13]

I will post tomorrow on what the problem ended up being.

[LuckyRps13]

Tested the Ohm's on all injectors including ones not in the car. all tested between 11 - 12.5 ohm's. checked the signals from the ECU the AC voltage read .3 at idle and 2.5ish @ higher RPMS. seem to be the same across the board since i did not have a tack out to watch them it appears to be fine. I did find out that Drivers can go bad for any given pin out and over load any sensor that the ecu provides power to. Under multiple recommendations of local tuners a solid cleaning of my fuel rails and have my injectors professionally cleaned and flow tested along with changing out the unknown age fuel filter. i am going to toss in fresh plugs because there is no clue how old they areas well. I will post again once the issue is completely resolved.