truefriend

finailly found the reason for misfire code .the fuel injector clips were a little loose ,they made a click sound , but had to be wiggled in a little more.... off went the check eng. light after weeks of hell and money wasted on pulgs.wires.cap.ect. the dealership could not find this one ,with all their dionostic machines,, they just threw parts at it

ezone

There isn't any machine that can diagnose a problem.
They are only tools.
It's all up to a human to use the tools effectively.

(It helps when the human doing the work has more brain cells than a head of lettuce.)

It helps if the problem is actually acting up when someone checks out the car. Intermittent and random can be awfully damned tough to find.

Branden_gt

Hey so two days ago, i changed one of the injectors, and now my car is misfiring on all cylinders. But Im not missing any vacuum hoses lose or disconnected.
Spark plugs work as well, but my misfires only show when the car is under load. Do you think its injector's connection?

ezone

How'd you find this? Documented in the Freeze Frame data, or you can tell it by feel?

Not my normal first guess. Ignition breakdown is the typical cause of misfires only under a load, and consistently repeatable.

ezone

Edit that to say dead miss under a load. Like when spark finds someplace other than the end of the spark plug to land.
Partial miss or weak cylinder contribution instead of dead miss would normally be something other than ignition.

Also, what I see as normal stuff in my world may not be the same as your world. Customers here aren't going to have their injector connectors off 3 dozen times in 3 months like some of the kids would, so injector wiring is pretty far down the list for me..





If you think it's injector connections, you should probably be able to wiggle each plug and cause the miss to come and go as the wires make or break their connections.


Another thought: Do all 4 injectors have the same flow rates? Not just ratings, but actual flow?
One that is way fatter or leaner than the rest can really confuse the computer.
Got the big seals on the bottom of the injectors all still in the right places, none slipped making vacuum leaks?