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Re: 3.9 V6 in a 2wd Dakota......
[Re: Robbins]
#642280
03/18/10 05:55 PM
03/18/10 05:55 PM
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Joined: May 2004
Posts: 4,920 Joplin, MO USA
Robbins
OP
master
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OP
master
Joined: May 2004
Posts: 4,920
Joplin, MO USA
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One more question....does the 3.9's idle rough. I test drove two and counting the one I bought and I think that they idle rough. They both ran down the road alright and was smooth, but seem to idle rough.
Is this nature of them or?
Moparlee
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Re: 3.9 V6 in a 2wd Dakota......
[Re: DaytonaTurbo]
#642282
03/19/10 12:32 AM
03/19/10 12:32 AM
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Joined: Jan 2005
Posts: 12,478 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,478
Kalispell Mt.
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Most of them do tend to idle rough, one cylinder being a touch off has a bigger effect on the whole when it is one out of 6 than 1 out of 8. Also the chains stretch and the plastic gear wears a lot and that retards the valve timing causing low vaccume and rough idle. A nice tight chain should also help the MPG by closeing the intake valve earlier(actually where it is intended to close) and helping to build cyl preasure, it will also let the MAP sensor know there is not as much load on the engine as it thinks there is based on a weak vaccume signal, if vaccume is weak it thinks there is more load and dumps more fuel.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 3.9 V6 in a 2wd Dakota......
[Re: Robbins]
#642284
03/19/10 12:59 AM
03/19/10 12:59 AM
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Joined: Jan 2005
Posts: 3,699 Newport, Mi
Evil Spirit
master
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master
Joined: Jan 2005
Posts: 3,699
Newport, Mi
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I've owned a '95 3.9, A-500, 3.23 reg cab and a '01 3.9, 5 speed, 3.55 ext cab and they were both consistent 20 mpg trucks (50/50 city/hwy driving), as opposed to my '97 5.2, A-500, 3.92 reg cab at 14-15 mpg. I towed my Spirit on an open trailer the 80+ miles to Norwalk several times with the '01 with no problems - it wasn't a Cummins, but it had decent power. Odd thing about the '01 - it got poor mileage and had no power till it hit 500 miles, then it was like you flipped a switch; I got noticeably better mileage and power, as if it had a "valet mode" in the computer so you couldn't abuse it until it hit a certain mileage and was broken in.
Free advice and worth every penny... Factory trained Slinky rewinder.........
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Re: 3.9 V6 in a 2wd Dakota......
[Re: Evil Spirit]
#642285
03/19/10 09:22 AM
03/19/10 09:22 AM
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Joined: May 2004
Posts: 4,920 Joplin, MO USA
Robbins
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master
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OP
master
Joined: May 2004
Posts: 4,920
Joplin, MO USA
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I think that I'm getting around 14 if I'm lucky with it right now. I've also noticed that goes into overdrive at 30 is this normal?
Moparlee
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