Cold Starts below 32 degrees
It has been really cold in UpState NY for the past few days <10 degrees in the morning. When cold starting my 2008, auto I am getting a really sharp noise when it first turns over. Almost sounds like metal on metal coming from the trans case. Anyone else experiencing this? I am warming it up for 5 - 10 minutes on average.
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Originally Posted by hoveyjk08
(Post 2767405)
It has been really cold in UpState NY for the past few days <10 degrees in the morning. When cold starting my 2008, auto I am getting a really sharp noise when it first turns over. Almost sounds like metal on metal coming from the trans case. Anyone else experiencing this? I am warming it up for 5 - 10 minutes on average.
All that is needed is to start it, let the RPMs drop to near normal idle, and start driving avoiding high rpsm until the engine reaches operating temperatures. |
I am more concerned about the sharp noise when intially starting the jeep. Anyone experiencing this? I have only heard this when its really cold outside <10 degrees
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Originally Posted by hoveyjk08
(Post 2767418)
I am more concerned about the sharp noise when intially starting the jeep. Anyone experiencing this? I have only heard this when its really cold outside <10 degrees
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Yes I experience this also, during cold temps below 32 degrees F. I think it might be a belt squeek on initial start up. I switched to Synthetic motor oil about 4,000 miles ago to help with cold start up. I run Syn year round, for better start up protection.
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Mine does the same thing. I'm using Pennzoil Ultra Synthetic and Purolator PureOne filter, both top of the line. So if the engine blows up, then hopefully it'll be while under warranty. Otherwise I'm not going to lose sleep over it.
The tapping noise we hear at start up comes from the hydraulic lifters. If the engine has been sitting a while without running, the oil leaks out of the lifters. When it's cold out, the oil thickens and doesn't reach them as quickly thus you get the momentary noise. Lowering to say an 0W-20 oil ought to help with eliminating cold start noise but then you run into the warranty issue. From Wiki on hydraulic valve lifters: There are a number of potential problems with hydraulic lifters. Frequently, the valvetrain will rattle loudly on startup due to oil draining from the lifters when the vehicle is parked. This is not considered significant provided the noise disappears within a couple of minutes, typically it usually only lasts a second or two. A rattle that does not go away can indicate a blocked oil feed or that one or more of the lifters has collapsed due to wear and is no longer opening its valve fully. The affected lifter should be replaced in the latter situation. |
If I don't plug mine in it will do this from around -10 Celcius and colder. I'm thinking it is a water pump bearing that likes to make noise on start up. Sometimes the lifter noise is there if it hasn't been plugged in. No sharp noises like the OP described though. This 3.8 is an engine that likes to be plugged in and warm when started. I know it will start at -30 without being plugged in etc etc, but this engine just seems to need that warm up for it to start quietly. And 5 to 10 minutes of warm up is okay when it is -30 or worse, but from 0 deg C to -20 deg C, 2 or 3 minutes is plenty. Any engine, and this one in particular it seems, warms up a lot faster while being driven somewhere. Of all the vehicles I have owned over the years up here, this engine seems to be the most sensitive to cold starts and the related noises that the cold starts can produce. I just hope it doesn't get worse with more miles and time.
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Originally Posted by hoveyjk08
(Post 2767405)
It has been really cold in UpState NY for the past few days <10 degrees in the morning. When cold starting my 2008, auto I am getting a really sharp noise when it first turns over. Almost sounds like metal on metal coming from the trans case. Anyone else experiencing this? I am warming it up for 5 - 10 minutes on average.
I hate to hear this noise :sad2: The dealer said to me this is normal |
Mine did this on the colder days. I plug it in every time it drops below freezing, cold starts are hard on stuff. A block heater should make this problem go away.
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