Injector hell


#1

One day the car was fine. Next day I go to start it and it had the shakes, big time.
AAA’ed it to the dealer, they told me that 3 injectors were bad (V6 engine). All at the exact same time, all 3.
I was told that it is common for injectors to fail in groups. Why?? They are in separate chambers. How can this be?
The dealer recommended that I also replace the other 3 injectors as a preemptive measure, since they are at risk of failure.
What’s the deal with injectors?


#2

The reason they sometimes fail in groups is that injector manufacturing is a highly automated, very well controlled, very consistent manufacturing process. Each is almost exactly the same as the one before and the one after. Ergo, their lifespans can be remarkably similar.

I agree with the dealer that you should change the others too. I would have suggested that too. You can expect them too to be at the end of their lives.


#3

It’s hard to say?

Since you don’t provide the year, make, model of the vehicle, for all we know there could be a Technical Service Bulletin that involves a problem with the injectors on said vehicle.

Tester


#4

Another reason for groups of injectors to fail is debris contaminating the gasoline supply , if it gets passed the fuel filter, or the source of the debris is post fuel filter, can clog any number, including all, of the injectors in a brief time. Did you purchase gasoline at a different gas station than you normally use in the past few fill-ups?


#5

Did you have all 6 replaced & did it solve your problem ? Did the dealer replace or recommend replacing any other parts ?


#6

Year, make, model, and engine size please.


#7

I’ll defer to the experts but I have never had to replace an injector. (120K, 350K, 520K, etc.) Now when I was at the GM garage way back though with a sticking injector, the mechanic pointed to a Vette in the next stall that he said needed three injectors. Said the owner was not going to be pleased. I guess I’d listen to the mechanic depending on what they cost. If its the $60 variety, its not much more labor to replace the other three at the same time.


#8

Had a 98 or so gm truck, mechanic could not figure it out, sent to the dealer, fuel injector, there was a recent post about problems, After numerous ages I suggested fuel injector, it happens sometimes http://community.cartalk.com/discussion/comment/3175929#Comment_3175929


#9

Bing, if the injectors on that 'Vette were as hard to access as some of the horror stories I’ve heard, I can understand why the owner wouldn’t be pleased.

It WOULD be interesting to know the year, make, model, & engine of the OP’s car, as ASE requested.


#10

I’d find it strange that 3 injectors failed. Depending upon the type of vehicle maybe the power source for the injectors is split in half with one circuit powering 3 injectors and another circuit powering the remaining 3. If a fuse lets go 3 of them die. It should be very easy to diagnose.

My Mercury was wired this way.

I’d replace all of them IF those 3 are legitimately bad but I’m a bit antsy about the diagnosis.
What happens if they replace all 6 and the same problem exists? You really need to be on the same page with the dealer about the “what if” part of this problem.