Ok this intermediate issue finally set some soft codes a dtc1223/1235 injector output circuit . So do I have a bad ficm ? If you recall I posted about the idle being rough a few weeks ago. The balance rates are good. This issue comes and goes.
some headway on diagnostics
- Thread starter MACKIN
- Start date
By the way this ficm has been replaced last injector swap. Perhaps a ground? Where should I look?I have to fix this I have to tow the duster to LIC NY next week
I sold it. Don't want to get stuck
I sold it. Don't want to get stuck
GMC_2002_Dmax
The Still Master
Appreciate it but I'd like to FIX it.I don't believe is injectors or injector coils. Does it hot and cold. Ses light is on now gonna dick with it tomorrow I guess. Check connections and grounds 
Check where the harness goes into the valve cover. Also check under the valve cover to see if any of the wires are rubbing on any metal parts.
Does the LB7 harness rub at the top of the FICM like a LLY? I agree it sounds like a shorted wire somewhere the way it comes and goes.
As far as I know no but yes it comes and goes but now it has set codes. The majority of time it runs fine I hope to figure it out on my own. Messed up this truck sits more than I drive it.i take it out and it screws up and now I need it, sucks. Might have to call joe. I'll look at it today and see which two objectors set codes I think it was3 and5 which are neighbors perhaps thats a clue
Thats why this is a pain in the ass I looked under the hood checked the grounds wiggled some wires pushed on some connections cleared the codes went for a 25 mile ride nothing. How do you fix something when you don't know what to fix?
I run into it all the time at work, sucks... Sometimes you just have to let them develop or throw parts at them, I'm not a fan of the latter.
Have you tried pulling all the connectors loose and cleaning them with electrical cleaner? Maybe check all the pins to make sure one didn't come loose.
Have you tried pulling all the connectors loose and cleaning them with electrical cleaner? Maybe check all the pins to make sure one didn't come loose.
So darn confusing! Yes I DO NOT WANT TO throw parts at it. Took it out again last night ,short trip and drove it into work this morning and it ran absolutely perfect! I suppose I'll just keep driving it until I can pin point it. With my luck,lord I hope not ,It
ll rear it's ugliness on the LIE in NY.
Hope not.
ll rear it's ugliness on the LIE in NY.
Hope not.
Start the truck, let it warm up, then start moving wires around to see if it does it.
My guess is that one of the pins on a connector is corroded or loose, or there is a wire with insulation rubbed through and grounding out.
My guess is that one of the pins on a connector is corroded or loose, or there is a wire with insulation rubbed through and grounding out.
I checked the bale connections and they look good , I should pull the FICM connections and check them. The truck sits inside my shop so IMO corrosion or dirty shouldn't be a issue. Also I don't believe that moisture can be a problem.
Up until Saturday it only did it on start up and like I said shut down and start up did not make the problem go away as I said in a previous thread I started. But disconnecting and reconnecting the bale connectors did. That is why I asked IF there was anything in the bale connectors that energize something and then when you disconnect it DE-energizes ? I know it makes no sense but that is what I discovered. The VERY first time my truck did this was when I had my Edge box on it ,by the way it was fine when I drove it around for a week or so, then I took it off,started the truck and it had the miss! So obviously I just disconnected the bale connectors and re connected and wa-la fixed.
Then to the present on start ups it repeated the miss. No I have not put the Edge box on since the last time. So I just disconnect the bales reconnect and wa-la fixed! Then Saturday for the first time while driving down the road it started the weird phenomena started to develop the miss!
What cleared it was the same procedure used previously! Since then (knock on wood) it has not repeated. In addition it threw the codes mentioned. It does have me worried (trust) as in 2 weeks I have to tow the car I sold in my trailer and a boat load of parts to Long Island New York which is over a 400 mile round trip I believe.
I have a hard time convincing myself it's injector related ,balance rates are good,or a injector solenoid(s) as what are the chances of all of a sudden two at the exact same time going? I could believe one but two? To refresh memory it threw Injector 1 output circuit and Injector 5 output circuit. Sorta kinda feel the same way about the FICM. Diagnostic was done with a Tech II.
Also at the last injector swap out mind you this had similar issues issues and why the injectors were swapped out if I recall. If I recall I used my Tech II to command shut down of individual injectors and one ,I don't recall which one there was no change in idle so it was assumed bad injector and all 8 were swapped. In addition after the swap out it had a occasional rough idle that could be felt in the seat of your pants but did NOT effect run-ability. At this time other items FICM were swapped out and the condition did not go away. Yes it is also a random occurrence. The only thing that cleans up the idle is if the idle speed is bumped up by even a 100th or less of RPM it idles smooth. So it didn't bother you it didn't bother me so that was that and have driven it many miles since then with no issue until this issue.
All work was performed at my Dealership. Yes I know this is long winded but I'd like to figure it out if possible. So where do I go from here? No Mickey Mouse work or tampering has been done to this truck EVER!
Other than jiggling wires (worth trying) is there any other possible diagnostics possible? Obviously there is a Ghost or Gremlin in my truck. Also I no longer drive it like I stole and give it respect and this is the payback I'm getting.
I assume solenoids are not swapped out with a injector change,will a bad or weal solenoid show up in a balance check? Is it worth a set of valve cover gaskets and have my buddy Joe (Stacks04) check into it? I still need to get my AC fixed. Thats it I'm selling this pig!
Balls!
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Just because it sits in a shop does not mean that moisture cannot build up in strange places. You mentioned that unplugging the bale connectors fixed the issue.
The edge box has been known to cause issues. I would start with the bale connectors and look for a loose plug there. If there is a loose plug in there, it can cause the exact issue that you are describing. Similar to what the LLY guys have with the Ice Pick problem. One of the connectors gets loose and starts causing issues.
You may want to check around the FICM to see if the wires have rubbed through. From there start tracing back up to the bale connectors. You might even want to check the cold side intercooler pipe up to the engine to see if the wiring has rubbed and is shorting out. By unplugging the bale, you repositioned the wires and it took some time for them to work back to their natural state up against the cold side pipe grounding out.
The edge box has been known to cause issues. I would start with the bale connectors and look for a loose plug there. If there is a loose plug in there, it can cause the exact issue that you are describing. Similar to what the LLY guys have with the Ice Pick problem. One of the connectors gets loose and starts causing issues.
You may want to check around the FICM to see if the wires have rubbed through. From there start tracing back up to the bale connectors. You might even want to check the cold side intercooler pipe up to the engine to see if the wiring has rubbed and is shorting out. By unplugging the bale, you repositioned the wires and it took some time for them to work back to their natural state up against the cold side pipe grounding out.
if this seems to resolve the problem, then I would look at the harness's, also maybe a terminal tension issue with the bale connectors.
That all makes sense for-sure seems to be the best course action at the moment. It has yet to act up and now with impending rain its going to be parked for a few days.
The bale connector pins ,need to refresh my memory should I pull out on the pins or push in? I'm assuming pull out perhaps a pin has pushed in slightly and making a piss poor connection? That is assuming I need to gently pull OUT on the pins?
Just so darn weird that the majority of the time it runs perfect!
Thanks
The bale connector pins ,need to refresh my memory should I pull out on the pins or push in? I'm assuming pull out perhaps a pin has pushed in slightly and making a piss poor connection? That is assuming I need to gently pull OUT on the pins?
Just so darn weird that the majority of the time it runs perfect!
Thanks
I was more leaning towards the female pins, being loose if you will. Doesnt happen often, but I have seen it happen on other GM vehicles, makes intermittent problems real fun to fix.
. Doesnt happen often, but I have seen it happen on other GM vehicles, makes intermittent problems real fun to fix.
Hmmm so push in on the wire on the back side I assume? Looks like they may be a bitch to get at.
Made my tow today truck ran flawless got12 mpg running70 75. Not a hiccup beats me can't fix what ain't broke
hiccup beats me can't fix what ain't broke
Ok more on the tow off topic but its my thread and I can do that!
First off I didn't touch the ruck before leaving ,in other words even although I was given great advise that may come in handy down the road I felt that since I had no more incidents up intill I left I figured don't touch it. If it gave me issues during my excursion then I thought that I would at that time try some fixes. Thankfully I didn't have to.
I have come to the conclusion that our infrastructure ,the roads, in this part of the country are deplorable at best! From central CT to Long Island has got to be the bumpiest rutted up pot hole section of asphalt I've ever been on. On the way back my chase vehicle said my trailer became airborne over some of the bumps!
Now the Tolls and the Port Authority. What a bunch of pissed off people! I ended up in the wrong lane (cash only) on the way down there and luckily someone let me in. That was a trick and a half my truck plus the trailer twisting it up merging. The same guy who let me in stayed in the wrong lane and the PA came out of his booth and pounded on the sign with his hand pointing to the guy! I felt bad for him but what could I do.
Whats the deal also with the PA asking for your REG? I had to dig it out all the while people behind me are laying on the horn ,WTF do you want me to do? People are such ass-holes!
Even tho everything fit in my trailer and truck I had my buddy in his 99 Cuming apart dually follow me as a chase support vehicle just in-case Big Black acted up he could haul the trailer and I could limp along if there were issues. THANK GOD THERE WEREN'T!
As I said BB ran flawless and got 12 MPG with the trailer 24' enclosed LOADED down empty back while the Cumming apart only managed to get 17 MPG!
Like I said THANK GOD nothing happened as on the way back after the toll I lost track of the chase vehicle. Apparently I told him go 95N which was clearly marked he went south,dope. Then I received a call that his Cumming apart literally was coming apart! At about 60 MPH all of a sudden started to shake and vibrate so bad that everything in his cup holder went flying! :rofl:
We were about 1/2 way home ,there about,and he had to maintain a speed of 45 MPH as it was wondering and shacking all over the road. Upon inspection when he finally got back the only thing that we can find wrong was it seemed to cook the front passenger side hub wheel bearing. He is having issues with the front brakes dragging on him and I think it cooked the bearing but who knows.
Other than the above it was a great tow,great truck,comfortable ride, if you dont use these trucks what they are intended for you missing out!
First off I didn't touch the ruck before leaving ,in other words even although I was given great advise that may come in handy down the road I felt that since I had no more incidents up intill I left I figured don't touch it. If it gave me issues during my excursion then I thought that I would at that time try some fixes. Thankfully I didn't have to.
I have come to the conclusion that our infrastructure ,the roads, in this part of the country are deplorable at best! From central CT to Long Island has got to be the bumpiest rutted up pot hole section of asphalt I've ever been on. On the way back my chase vehicle said my trailer became airborne over some of the bumps!
Now the Tolls and the Port Authority. What a bunch of pissed off people! I ended up in the wrong lane (cash only) on the way down there and luckily someone let me in. That was a trick and a half my truck plus the trailer twisting it up merging. The same guy who let me in stayed in the wrong lane and the PA came out of his booth and pounded on the sign with his hand pointing to the guy! I felt bad for him but what could I do.
Whats the deal also with the PA asking for your REG? I had to dig it out all the while people behind me are laying on the horn ,WTF do you want me to do? People are such ass-holes!
Even tho everything fit in my trailer and truck I had my buddy in his 99 Cuming apart dually follow me as a chase support vehicle just in-case Big Black acted up he could haul the trailer and I could limp along if there were issues. THANK GOD THERE WEREN'T!
As I said BB ran flawless and got 12 MPG with the trailer 24' enclosed LOADED down empty back while the Cumming apart only managed to get 17 MPG!
Like I said THANK GOD nothing happened as on the way back after the toll I lost track of the chase vehicle. Apparently I told him go 95N which was clearly marked he went south,dope. Then I received a call that his Cumming apart literally was coming apart! At about 60 MPH all of a sudden started to shake and vibrate so bad that everything in his cup holder went flying! :rofl:
We were about 1/2 way home ,there about,and he had to maintain a speed of 45 MPH as it was wondering and shacking all over the road. Upon inspection when he finally got back the only thing that we can find wrong was it seemed to cook the front passenger side hub wheel bearing. He is having issues with the front brakes dragging on him and I think it cooked the bearing but who knows.
Other than the above it was a great tow,great truck,comfortable ride, if you dont use these trucks what they are intended for you missing out!