Anything that would cause an error code 27, injector 5 or bank output stage does not respond properly

I have swapped out the injector but still get a check engine light. Light does not consistently come on. Did not come on all winter but now started coming on again.

94 Dakota 5.2L automatic

 

I have code 27, along with 25. Did you figure anything out?

 

I do not remember which code I had.. but it was something to do with the injectors for sure. Probably 27.

Code 27 is in fact an fuel injector code. But being OBD1, it won't tell you where it is. Where did you get number 5 from?

Does your truck have a rough idle at all? If it does then do this trick to find out which injector it is. With the truck idling and running rough, unplug one injector at a time. Plugging them back in as you go.
If it is working correctly, then the truck should start idling even worse, plug it back in.
If it is not working correctly, then there should be no change in the idle at all and you have found your problem area.

It is not always the injector that is bad though. On my truck, there was a splice made in to one of the injector wires for a previously installed command start. This splice was not done very well and ended up getting corroded so I replaced the pigtail and it worked fine.

Here is a thread that explains in more detail using an ohm meter to test your wiring and injectors.
https://dodgeforum.com/forum/1st-gen...code-27-a.html

 

Don't remember which code it was, but I kept dropping cyl. 7 and getting a code for injector 7 last summer. Mopar performance ecu was the cure. Factory ecu was dropping pulse to injector 7.

 

I have a code scanner that told me its injector 5

I have tested the resistance of each injector and all of them fall in the correct range. I'm possibly thinking it could be the ecu

Does anyone know how to test to see if the ecu is dropping the pulse?

 

yea, its easy. take a 194(license plate bulb) and straighten out the little metal contacts on it, and pull the suspect injector wire off with the truck running, and stick the bulb in the harness plug. if it pulses nice and bright, your getting good juice(pulse) to that injector. I doubt you have an actual injector going bad, haven't seen that too much. pcm or wiring going bad, however, is very common with these trucks.

 

Actually depending on how you read the codes you can get the exact number of the problem injector. If you do the CEL method or if you have a code reader that just outputs the code number then your right. But most of the simplest code readers have an display that will describe the code, then most likely it can tell you which injector. Mine does, as well as it sounds like the OP does too.

My suggestion is to switch the known bad injector with a known good one from another cylinder, and reset the codes/pcm. Then see if the codes comes back up and if the code follows the problem injector or sticks to that same cylinder.

A missfire can be a sign of low fuel pressure and/or volume test those. Another common thought reason for the code 27 is the power splice for that injector on the wiring harness.