I only have one mode with my climate control and that is defrost and I need it for the winter. However, the engine idle cycles and it misses with the defrost on. How can I make the engine not do this? I tried disconnecting the compressor because it wouldn't cut off and it freezes up. Seems to run great with the entire a/c system off. Any thoughts?
HC

 

Seems to me I read that the A/C clutch wire can rub through and cause problems.

 

Ok I thought the A/C was making the thing miss but I guess not. I'm so so so dang fustrated.... its missing again with or without the A/C! I really wish I can throw a 12v at it or hec even get rid of it. This truck right now seems like the biggest piece of garbage I ever owned with its little mystery missing, A/C system broke, transfercase broke, axles leaking, front pinion seal leaking, grid heater broke I JUST DON'T what to do at this point. Further, I made a very bad choice getting a DD clutch this add more to the POS factor My thought at the time was that it would last a long time and it sounds and shift like crap.
Sorry that this isn't a very uplifting message today, just my thoughts.

 

Sorry with all of your problems. Please disregard this advice if I'm completely off track. Is it possible it's your intake heater cycling while idling? If the truck is cold, it will do this to heat the air. Mine does it every morning if the temp is below 35 degrees. Just a thought.....

 

The A/C compressor is designed to cycle when the defrost is on. That's normal. When it cycles it drags the engine down a bit. That's normal too. I keep my CC set on defrost all winter because I'm trying to save my blend door from possible issues. (It still works great) I think you may be worried about nothing.....

 

My grid heater has been disconected because it melted the battery post. For some unknown reason it stayed on until the lead on the smaller wing nut post on my battery melted off. So now I have no preheat. I really don't see a reason for the preheat once the engine is on. This happened to melt in Sept at south TX in 85 degrees weather, figure that one out.

As far as the defrost goes the A/C compressor has been disconnected because the compressor wouldn't disengage. Even with the compressor disconnected the engine still idles up and down thinking the compressor is connected. The other issue is I beleive that all the blend doors that redirect the airflow in the vents are broke or striped out.

 

The idle miss is probably a injector or FCM on the CP3 going out. It could also probably be from your quad. To me it sounds more fuel related, but you will need to remember that you Pay to Play. Pay to play changes the outcome for troubleshooting. Now you will have to find out if it is the quad, a factory part, or both. The only way I see it, is to remove/replace one at a time and see if it improves or remains the same. However, your other post on other threads show that you have more problems than what you are letting on. These others problems will also need to be fixed too to eliminate them (Such as a turbo back exhaust system = a possible exhaust leak miss).

The melted wing nut terminal sounds like a large amp load being applied and that was the weakest part in the wiring. Your Grid Heaters should be air temp control by the ECM through a relay or TIPM. I would look at the TIPM for the defective relay or switch instead of blaming the Grid Heater as fault on a 85 degree day. Who knows. It could also be your Quad.

Your AC compressor problems could be either no freon or over an over charge system. You could also have one of the few trucks that had a defective AC compressor. Check the Dodge Ram TSB Index site for more information.

Shawn

 

Thank you for your thoughts.
The Quad boost fooler is the first place I'm going to try as far as the FCM I'm not all that familiar with this yet. I will give you feedback when I try this thanks again.
Herb.