I have been have a problem with misfiring in cylinder 8. https://dodgeforum.com/m_278898/tm.htm (thread i posted before)

Brought it to a mechanic and he said that it was a fuel problem in that cylinder. What else could it be besides the injector???

Thanks

 

Besides the injector your intake manifold could have a vacuum leak. So whatever cylinder is missing could be sucking air and causing you it too run way too lean. That could cause a miss. I had a 93 Blazer with a 350 that had that problem, changed the gasket and fixed it. A good way to test is to take a can of spray carb cleaner and spray where the manifold meets the head, if your engine looses the miss you know that is what is leaking because it has made the mixture rich again. Just a thought, but most likely its and injector I have had to replace a few on late model Dodges. Most computer scan tools have features that let you turn off individual injectors so you could do that too and find that one that doesn't make it run any worse but any good mechanic should know to do that.

 

bad valve, bad intake gasket... bad head gasket

 

the mechanic thinks that it is probably the injector. Put injector cleaner in it to see if it will fix the problem. To replace an injector, all you have to do is unscrew the fuel rail to raise it, unplug the wires that go to the injector and take injector out, right??? Does anyone know where i can find an exact replacement???

Thanks

 

I don't know about you, but I hate spending money I don't have to, so before you plop down a few bucks for a new injector, do a few free tests first. If you think it's a bad injector, pop off the fuel rail and the suspect injector, block off all the other ports really well (or pull of the other injectors and leave them in the rail to block the other ports), pour some gas in it, and force some air through it (around 40 psi will do it) via an air compressor while putting 12 volts to it (you need to put 12 volts to it to open the injector so it sprays).

If that checks out, do a compression check. It seems like you've been avoiding that in fear of a big problem, which I don't blame you for, but it'll take a lot less time than checking the injectors, and will either confirm or deny a serious problem.