Car / Truck Won't Run or Idle / Fix - F150 is the patient

If your car / truck will not run or idle. This is a 1994 Ford F150 XL with a 4.9 inline V6. Most vehicles work the same way. research which you have MAP sensor or Mass Air Flow Sensor.

I got my MAP sensor cheap off

[brandonstewart]

I'm sitting in my 97 F150 tapping the gas constantly then see you start doing the same and hallelujah I may have finally found a video describing my problem.

[STBRetired]

I can't imagine a more perfect instructional video. Minimum talking then you showed us what might be wrong, where the parts are located and how to remove, replace or clean the parts. Great work. UPdate - I see on another video where they had the same symptoms and other garages couldn't fix the problem. The mechanic hooked up his oscilloscope and checked waveforms et al and narrowed the problem down to the MAP sensor, too. Now I'm not sure if it was the original MAP sensor or an aftermarket one but when the mechanic pulled it out water poured into his hand. Sure enough, the back cover could pop right off and there didn't appear to be any gasket. The mechanic speculated that the water may have gotten into the MAP sensor if they power washed the engine compartment or maybe it just ran down the windshield - under the hood - and on top of the MAP sensor. Interesting but something to keep in mind if anybody's F150 starts bucking and snorting.

[Superspaz]

Couldn't get my 88 f250 to run, and after throwing sever parts at it, to no avail, I saw this video, and gave the map sensor a shot. As soon as we plugged the new one in, the truck came back to life! Thanks a ton man

[periculumesse]

Hi Brian, Thank you for your video. I got my truck fixed. There should be rewards in heaven for people like you! Thank you!

[laurenbaier]

I never comment on videos, but I've been going crazy for +1 year trying to fix my 1988 4.9. Replaced fuel parts, coil and wires, temp sensor.... FINALLY the MAP sensor! Thanks buddy!!!

[erniebusby]

I love how you whip through a lot of great content in a minimum amount of time! Lots of YouTube guys can’t seem to figure out how to do that. Thank you!

[meidingt]

Brian,
Just a note to thank you for your no nonsense advice and straight shooting expertise. My old F150 has been ressurrected and I take 10% credit. 90 goes to you.
Yes, I subscribed.

[vtailv]

MAF sensor's are used in all states, I have one on a 01 Ford Taurus SEL, I got in New Mexico, and got another 04 Taurus SEL 3.0L in Tennessee, I know this video was done while back but with the OBD2 implemented it's a better sensor and does more functions than a MAP sensor could handle.

[RifleReport]

I don’t normally comment but I felt the need to thank you. I’ve had idle problems in 88 f-150 4.9l for 2 years and I just put the MAP sensor in and it seems to have fixed the problem thanks a million.

[allenbryant]

Allen Bryant - June 2020
My 1990 F150 would not stay running unless I kept pumping the throttle, Very similar to your video. I then changed the MAP sensor as you did and my problem is solved.. Thanks so much for making this video.

[selvisfan]

I’m saving this video to my favorites. I just bought a ‘96 F-150 with the 4.9L I-6. This may come in handy one day. Thanks for posting it!!

[cleanassfrd]

Also, a dirty/malfunctioning EGR valve will cause a rough idle. My f150 is a 1995 model, and I’m quite sure it has a mass airflow sensor, right after the air filter and before the throttle body. Don’t think it’s a California model either. Great video, love Dio

[durango]

great video/direct and to the point the way it should be...

[tomashernandez]

Great video. Bought a 1989 f150 for $300 bucks. Real rough idle. Replaced the sensor and voila. Idle is smooth and engine is strong. My check engine light also turned off.

[bobbyhill]

You the Man!!! Got a 94 f150 5.8L V8 Windsor. Kept dieing and stalling out. Replaced the fuel filter, same problem. Cleaned the IAC and map sensor like you said, no problems perfect idle at 900 to 1k rpm in park!!! Saved me $350 bucks. That what the local mech would have charged for labor

[robbyjones]

Get a Actron CP9690 code tester. It'll check live, record, emissions test, it'll turn off the check engine light, it'll turn off the oil maintenance light, it checks transmission codes, ABS, SRS, and MORE!

[tylerjohnson]

Thank you! I came back here to comment and say that in the 1 minute it took me to replace this it freaking worked. only recommendation, drive the truck before you assume it didn't fix it. lol

[roncalender]

Awesome intro with RJD. Nice chickens too.

[dustysidepanel]

your idler pulley squeaking at the end is a reminder of how i need to warranty mine that i just bought 6 months ago and squeaked ever since. why havent i returned it to autozone yet? idk. but its coming off tomorrow. thanks bud

[williamclauss]

AWESOME ... I have an 86 f150 4x4 5.0 .... THIS FIXED MY TRUCK . I cleaned out the IACB and runs great . thanks