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my 2005 dodge ram 1500 4.7 liter engine stalls out in cold or winter conditions.. I’ve replaced Throttle Position sensor, cleaned throttle body and Idle air control valve, and it still hasn’t fixed the problem.
In the summer the vehicle rarely stalls but rpm does surge up when coming to a stop..any one who has fixed this problem please me know.. or if anyone can offer some other possible causes to go after…PS. I bought a new PCV valve because there’s excess yellow moisture in the oil cap..i think it may be clogging the PCV in the winter? (pvc located in oil cap canister) the truck has 365,000 km or 226,801 miles on odometer… the truck also feels very slow to take off from a stand still on cold mornings…
i heard throttle bodies could be bad or need computer programming..
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there is no check engine light ..but i do have a scanner that can do live data…i will do it soon..like said it only acts up in cold weather…
+1 on checking for codes. That would be your most useful clue as to what the issue might be. Either the computer isn’t being told that the engine needs to go to idle, or the commands being sent from the computer aren’t being carried out. Since you’ve already replaced the IAC then I suppose you could rule that out, but don’t forget to check the basics like vacuum leaks. These can cause issues like this and not set a CEL. More info here.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
Keep us posted.
i did not replace the IAC .. i cleaned it and lubricated it and put it back in..should i have replaced it? …i only replaced throttle position sensor… i will scan it next, then check for vacuum leaks…
In my opinion you would have been better off replacing the IAC. That said, sometimes cleaning them helps, sometimes they just need to be replaced. I’m not saying that’s going to solve your problem. For that you’re going to need to track down the cause. Otherwise you’ll just be throwing parts at it until you get frustrated. As I stated, it could be that the computer is either getting bad information or sending bad commands. Now it’s time to figure out which one it is. Also don’t forget to check for vacuum leaks just to rule that out.
Keep us posted.
Just an UPDATED just truck has now started stalling again..as soon as the temperatures start dropping..i did the engine scan..no codes came up…coolant temp, TPS , Map, o2 , iat sensors seem like normal readings to me..the fuel system is in closed mode….only thing that seems weird to me is that the short term and long term fuel trim reading are in the negative both on cold engine and a fully warmed up engine…when engine fully warms up its less likely to stall..but will shudder on stopping once in while…other wise it will drive normal..? i will probably change the iac valve and pcv and see what happens…
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