2001 ford ranger
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2001 ford ranger
I have a ford ranger 3.0 v6 I just put in a new maf/iat once it is pluged in and the motor backfires and sputters but when unplugged the motor runs ok but still drivable. I had it at ford and they cleaned the throttle body and replaced the idle control but still doing the same when plugged.. any ideas because Im at a loss
Postmaster
Joined: Jun 2014
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From: Oakhust NJ Jersey Shore
Do you have access to a scan tool? I't would be good to know what the ambient air is and what the mass air flow is at idle and under acceleration. I would also check the fuel pressure sounds lean, change the fuel filter recently?
Cargo Master
Joined: May 2001
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Start looking for a air leak between the maf and the throttle plate. It is getting unmetered air. It can be a vacuum leak but it would have to be pretty large. There are other lines running to the large hose check those also. Unplugging the maf just puts it in a default mode.
Posting Guru
Joined: Jun 1999
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Okay, so how does it run with the MAF unplugged? Good, bad, crappy? If it runs good then that tells you the basic stuff is okay. As noted, start looking for an air/vacuum leak. On my 93, I had a big hole in the air tube that connects the MAF/air filter box to the intake...but it was up underneath and you couldn't see it from above. Hoses rot and get disconnected, so check everything. Meanwhile clean the MAF and IAC if you have one, and check fuel pressure at the rail. On my truck, before I found the hole it would surge at idle...between 1000 and 500 rpm, but it ran...in gear and above idle it ran okay but really sucked the gas. Another thing to do, disconnect the battery cables for about 10 minutes then hook them back up...resets the computer, which may have an old hard fault code in memory that is affecting how it runs. But I'm betting you have a vacuum/air leak somewhere.
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mgmoynihan
1983 - 2012 Ranger & B-Series
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Aug 25, 2007 04:04 PM
