Emissions Problems(Check Engine Light)

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Jun 21, 2007 | 03:15 PM

zbollman

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Emissions Problems(Check Engine Light)

Alrighty, I purchased this for cheap with the check engine light on. It is a 1996 F150 Standard Cab 4x4 with 170,000 miles on it. I have replaced all of the sensors, redone all fittings and hoses, and had the entire engien pressure cleaned. The check engine light was on saying it was lean in bank one, and it wouldn't pass emissions. I am wondering if anyone has a solution or previous situations similar. I am thinking of replacing the ignition system in hopes that it is just firing bad or not enough to pass. The truck was ran hard before I got it but runs great still. If anyone can help me with this it would be greatly appreciated.

Zach

Jun 21, 2007 | 05:20 PM

Silver Streak

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From: Broken Arrow, OK

Clean the MAF element carefully with some brake cleaner or rubbing alcohol and a Q-tip. A dirty MAF is what usually causes this code. If it's not that check for vacuum leaks.

Jun 21, 2007 | 08:42 PM

zbollman

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Sorry for my ignorance, but what is the MAF, and how would I get to it? Almost all of the lines are replaced and checked for vacuum leaks previously to me buying it.

Jun 21, 2007 | 09:38 PM

jimbo beam

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From: Hawkeye Country

MAF = Mass Air Flow. The mass airflow sensor is located in the air intake line. On my 96 F150 [302] its located right after the air cleaner box. The sensor hangs inside of an aluminum tube.

To remove the unit release the wiring harness that plugs into the side of it. Undo the clamps that hold it to the air cleaner box and the air hose. once removed look inside of the tube the sensor will be hanging in the middle. To clean it spray your cleaner on to it and wipe away with a q-tip.

By the way they do make special maf cleaner, not quite as harsh as alcohol or brake cleaner.

Jun 21, 2007 | 09:47 PM

zbollman

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Alrighty, I have been wondering what that sensor was. I'll clean it tomorrow and have the codes reset and see if it solves that problem.

Apr 29, 2015 | 06:15 PM

TJ Stewart

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my check engine light just came on and they couldn't get a reading but told me I had Multiple oil leaks PTS....what is PTS?

Apr 30, 2015 | 12:08 AM

ZarK-eh

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From: like subarctic, brrr man!

oh, nice a '96! Ford only made one year 4.9L with OBDII and MAF sensor. If I found one I would have used it in my '78.

Also TJ Stewart, no idear what a PTS is... Might wanna consider a new thread or post to get a better response.

Edit: Found this to help OP find the MAF sensor: https://www.ford-trucks.com/forums/1...ml#post1107160

Last edited by ZarK-eh; Apr 30, 2015 at 12:10 AM. Reason: add url to help locate MAF sensor