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Old 03-30-2017, 02:23 PM
Cy1626 Cy1626 is offline
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Default Ranger idle problem?

Hi all. My ranger has been acting funny the last two weeks. Last week I was at a red light and my truck randomly started having a super rough idle and eventually stalled and wouldn't start back but after about 2 minutes of cranking it it finally started running again and no check engine light came on and I started driving and it ran fine then this week I was at McDonald's and it had the rough idle again but this time didn't die but it threw a check engine light so I got it over to advance and had them run the code and they were p0171 and p0174. Also when it has the rough idle and I press the gas it kind of just putters until it catches then drives fine. I jumped my inertia switch and cleaned my mass airflow sensor which I hope fixes it but it does it without any kind of warning and when the truck is at operating temp and always starts fine it's a 2002 3.0. Thank you!

Now it dies going down the road once it's warm I'm not sure what the deal is

Last edited by Cy1626; 04-16-2017 at 11:02 AM. Reason: Update
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Old 03-30-2017, 02:43 PM
cvar cvar is offline
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Default Re: Ranger idle problem?

Mine did that too. It would stall in cold weather, not so much in warmer weather. The p0171/p0174 means you have an air leak somewhere. Find that leak! Mine leaked mostly at the upper intake manifold gasket and the fuel rail gasket, so changing those fixed mine. No more stalls. Yay! Replacing the IAC, DPFE, and MAF did nothing to help mine. Small air leakages also come from vacuum & PCV hoses.
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