2001 Ranger problem.....

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Feb 23, 2008 | 07:30 AM

Pablo-UA

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2001 Ranger problem.....

Engine shakes at idle a bit, got P0171 code. Engine revs up well, but when I floor a gas (kick down mode) I got missfire.

Suggest vac. leak, the quation is what is the usual for 4.0 sohc points of leak, small o-rings are ok. Mat it is time to replace air intake?

Feb 23, 2008 | 09:08 AM

aquanaut20

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From: BC Canada

When was the last time you did a tune up?

A miss fireing plug can also generate that code.

Feb 23, 2008 | 09:35 AM

Pablo-UA

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in december, 2007. Plugs are OK too. I'm nearly sure in vac. leak, but how to learn where.... I need vac. leak detector.

Well, how to clean MAF correctly?

Feb 23, 2008 | 10:25 AM

aquanaut20

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connect a vacuam guage, and check the reading. Use a propane sniffer to locate the leak.

https://www.ford-trucks.com/forums/1...-cleaning.html

Feb 23, 2008 | 10:53 AM

Pablo-UA

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Use a propane sniffer to locate the leak
_______________________________
How! I used to find intrcooler ore turbocharger leaks.....

Feb 23, 2008 | 11:46 AM

aquanaut20

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Pablo, if you have a handhelp propane bottle (plumbing burner), connect a section of rubber hose to the pipe after the valve, turn on the propane flow (slow) and aim the open end of hose at the potential leaking area, if there is a vacuam leak the RPM will increase.

Use in well ventilated area.

Of course a smoke generator can be used instead, but more investment($$$)