cadillac cts injector replacement missfire check engine light flashing 

Glad it helped you out. Your welcome!

You probably pinched one orig

@@JaboTheMechanic Can I turn the car on while the upper intake manifold is off? I wouldn't know how to track down the leak without seeing the injectors.

@@HeWentRogue: you’re going to have to take them out and check em.

@@BilgePump I ended up taking it to my mechanic friend. He checked it out and said that one injector was leaking from the oring and that I must have loosened something up in the fuel rail because there was a leak there also. Makes sense though, I wasn't very gentle when I was taking things apart and putting them back in. It was a good learning experience though, I almost did it all myself

Did you ever fix it ? I have the same car but issue with 1,3 misfire and had a previous code for the fuel pressure regulator but went away

So if you have po204 either your injector is bad, wire harness, or most common issue would be the ecm

@@JaboTheMechanic okay thank you very much! What's really strange is while the car is running the engine light keeps going on and off.

X

Yes thats because it's misfiring on cylinder 4

@@JaboTheMechanic you say its normally a ecm?

I'm going through the same thing now on my 05 cts. My thought is that I'm going to pop all my injectors out and send them in to get cleaned and hope that fixes the problem. If it turns out to be the ecm then at least I don't have to worry about injectors for awhile

@@HeWentRogue I’m having same issue same car any updates on yours ?

@@jayferb2224 I have an 05 and I've been having issues for a year. I've replaced coils, spark plugs and still running really bad but I'm gonna take it back and get another diagnostic on it and see I'm pretty sure it's injectors, I've just been putting it off because they are so expensive. I guess last but not least could be ecm.

Same thing?

Glad it helped

Any codes?

Check your compression

It doesn't have an iac valve. You could have a faulty injector that is leaking into the cylinder

The computer of the car

Plug and play

​@JaboTheMechanic do you have the product number or remember the place you got them from. Trying to order a set

Yes I do

@@JaboTheMechanic I got 2005 cts I used your video to do it and when I was finished it crunk up and I push gas nothing . I got it back going and It still misfiring but I only could change one . I'm shrimper and I just going wait til I go work and get back 6 spark plugs 6coil packs 6 injectors Is what I'm going to do just was strapped . Anyways thanks u really help me in pinch

I love car so I'm bout to do lots to it it 2.8 can I get chip for makes faster and pointers on how

One question ok starting off I need change no 5 coil pack from front of engine back right is it anyways only plug burnt I change coil pack and spark plug ran good for 15 min or so started again now gas gauge sand few other thing not funtioning right by way . Now coil pack new spark plug pulled it black already my friend helping me does something check if plug firing yes messes with coil pack and test injector boom gas gauge working engine light off put new spark plug in back together 20 min or so miss firing again computer say no 5 injector so I get and finally change it tonight back to get her crank had problem I initially asked about cranks push gas nothing rpms nothing I got it figured out but gas gauge no working engine light not working still mis firing . I'm thinking spark plug fowled out again I have been driving week or two like it is sometimes got to do what u got to do . Now if I change spark plug any chance gauge and light fixed . And that is right no 5 back by fire wall on right