1993 f150 4.9 bad idle / bad throttle response / very rough running 

I absolutely LOVE that you took the time to show all of the parts that you replaced. Very thorough video! Thanks!

After watching your video, I went and replaced the MAP sensor in my 92 f250, and its running much better . Thank you.

I have a 88 f 150 4.9. I looked at this today. Went out and bought the map sensor. Only $49 And replaced it. And it is 98% better no rough idle and running smother!! Thank you !!!!

Thoughtful video sharing your knowledge based on your experience; no doubt you have been a big help to many older truck enthusiasts, including the author of this short text. Thank you.

Thanks man been having this problem with rough and high idle for a long while with my 94 ! Checked and replaced everything you mentioned and more! Will be replacing the map sensor next! Thanks for sharing the info👍

best engine ford ever made.

I'm having the same issues with my truck, and this information helps tremendously. Thank you. 👍

Thanks for the video.I'm having the same problem with sluggish response at idle and not wanting to take the gas.Pointing out all the other items you replaced and their location on the truck was helpful. Saved me a time and money not to replace them and go right to the MAP.

I fucking love you sir with all due respect!!!!! You have no idea wait you do have exactly an idea of what I've been dealing with! Now because of you taking your time to do this video you saved me the most valuable thing we have and that is time sir. I've been working on this 95 f150 (not a mechanic) for 2 weeks! Rewired the entire fuel system (both tanks) and after a bunch headaches your video put a end to my nightmare! I wish I could buy you a beer my man I really wish I could. Thank you sir

You just saved me from a new engine thanks for the post you got yourself another subscriber

That's EXACTLY what mine is doing...Thanks so much...Can't wait to try it...You're a great dude to take time out of your life to "look out" for your fellow man...Health, freedom, love and respect to you and yours...:)

This was a very informative video. My 5.0 just started doing this and overheating, i guess im getting a new map sensor and a thermostat! Thanks man! Such a relief and a weight off my shoulders ive been trying to get my old ford on the road for nearly two years and ill admit i cried when it came back from.the shop doing both of these things, seems like itll never be on the road but your video gave me hope! God bless

Omg I have been trying to track down WTF was wrong with my 302 has got to be the same thing. I have spent so much money replacing shit. No mechanics could figure it out. THANKS BRO!! Such a simple fix

Thank you thank you thank you so much I've taken my truck to a bunch of mechanics, can't figure out what it is, same symptoms and all. Imma give it a try and see what happens! Thank you!!!

You did a very good job explaining your troubleshooting. Thanks.

It is a shame that a shade tree mechanic such as yourself, after untold hours going back and forth to the auto store, buying everything in stock except the EGR (lucky you) has to be the one true and honest person to help out all the rest of us F150 owners. May God bless the rest of your truck driving miles. I'm going to call the auto store for my MAP sensor and I'll keep my fingers crossed. Thanks man.

I knew it was the MAP sensor when you started talking. I did an engine swap a few years back and upon start up, I had the same issues. After going crazy trying to figure it out, I found that a mud dauber wasp had built a nest in the vacuum line to the MAP while it was disassembled. I ran a piece of wire through it and a bunch of mud and larvae came out and after that it ran just fine.

Thanks this is exactly what my truck was doing and the MAP sensor fixed it. FYI you can confirm that it is the MAP sensor by just unplugging the sensor and the truck should run fine but with a check engine light.

Thank you for your time and video. My 300 is running poor and powerless. I was thinking timing...but now I have a new area to look. Thanks again.

I replaced everything you just mentioned but map sensor! I'll give it a shot. 94 explorer

I have a 92 e150 van with a 5.0, and it's doing the exact same thing heat and all lol I was going to go thru all them sensors, but watching your vid helped hell of a lot, I've been trying to find the right vid on here for awhile that fit my symptoms, and yours fit mine to the T, so as soon as the sun come up I'm on it! Thanx bud😎🖒

Same symptoms happened to my sons 1995 f 150. Found your video, replaced MAP sensor, truck fired right up, and running like new. Thanks for the video!

I repace the fuel filter and i replace one of the fuel pumps because my e150 has 2 tanks. Is a 1988 econoline. Thanks for your video.

I think you're an awesome mechanic 🤗

I have an 89 f150. My truck would run rough and rich on idle. But would clean up at higher rpm. The fuel pressure regulator was leaking fuel into the vacuum system. Also the intake gasket on the throttle body was sucked in. Btw you can usually use any thin wall hard plastic tubing to get those fuel filters off. Just cut it length wise and slip it into the fittings.

Try diagnosing the issue (and learning part names) before throwing money at the problem. A vacuum tester is inexpensive. Sometimes it's just a broken vacuum hose, like on my F-150. Hose is the cheapest item you can buy for these trucks. If you're rich and have nothing better to do, throw your dollars there first.

Same problem with my son's 92 F-150 ............New fuel filter, plugs, wires, cap and rotor.......the idle is very low.......thanks for the idea about the MAP sensor, I'll try that next.

My 92 was running rough and I replaced the intake manifold temp sensor and the spark plugs and it's running better now. The sensor was covered in sludge.

Thank you so much for making this video, really helped me out 👍👍

Unplug the negative lead from the battery, the unplug the connector from the MAP and put dielectric grease on the ports plug it back in, plug the cable back onto the battery and start her up! Night and day difference!

Thank you so much. I was so close to giving up on my baby. 96 about the same model but emerald green

Thank you had the same promblem with mine

I’ve changed fuel pump & filter, water pump, thermostat, plugs & wires, distributor & rotor, o2 sensor, coolant temp sensor. Not all but mostly trying to fix the idle. It’s a little shaky and rough not stalling out but it’s noticeably off. Looked at all my pulleys cause I noticed a chirping noice with the truck running and noticed my harmonic balancer/crankshaft pulley was moving back and forth slightly. Definitely replacing it tomorrow along with the map sensor and fingers crossed my idle will be fixed 🤞🏼

Before you changed the MAP sensor would the truck shut off when you come a stop before it warmed up ?

Sounds like pretty much every regular dude that doesn't work in mechanics: I replaced like everything I could think of ... A couple hundred dollars later I finally found the culprit! Haha I love it. It's me everytime.

That blu Ray quality tho

Thanks, my 1989 F150 just started doing this. Saw your video and under $20 it fixed it. Great Video!

I wanted to thank you for this video. I was going to start replacing parts, but after watching this video I did the MAP sensor and my vehicle was imidiately back to normal. Thanks again Cheers

Yep, MAP sensor.. Same thing happened to me on my 4.9 E150 just wouldn’t start . My buddy’s brother had a no start problem on his Ford truck.. it was the MAP. He said try that.. I did and it started right up.

Good job. Too bad you had to go through all the steps, but you learned in the meantime

Sounds exactly what I am dealing with on my 1990 F150 4.9L 4WD Manual Transmission. Going to auto parts store in the morning to buy me a MAP sensor. Keeping my fingers crossed...

Bad idling is almost always the MAP sensor.

I have the same problem I was thinking of changing all the parts that you did but I think I’ll start with the map sensor as well

sí podrías apoyarme mostrando un video de todas las mangueras de vacío que tienes?

😂😂😂😂 you sound like me everything I just did..... tell me it's the regulator? Lol (still watching).....

I have 90 with the 4.9 6. Mine idles great and starts good but the acceleration sux. I'm gonna try this, thanks for the do's and don'ts!

Thank you. Having the exact same issue. Hope that's it.

I just replaced Plugs wires cap rotor coil egr valve and ICM getting a few codes and an IDM to PCM connection error.. Yes we have a reader that kinda works. It has different cartridges like a gameboy console that plug in. Funny as hell but it did work until it lost connection to the computer.

Dude. I've been throwing parts at this thing since replacing my fuel pumps. The last thing you'd think of would be something that doesn't appear to be in the fuel system, WTF. I can't thank you enough.

Just changed mine in my 95 F-150 4.9 it been getting bad gas mileage and a intermittent miss or surging

Good 🎥. Always the map sensor when the car starts up fine and has a rough idle issue. Good video. 95% of the time its the MAP sensor

Some cars and trucks use a MAF sensor instead of a MAP sensor, but the symptoms can be very similar.

Ok might as well keep all the parts in storage, since they are good, then you'll have them..

You just saved 2 of my trucks. 93 f150 and 2001 f150. You are a hero!

Granted, using the shotgun approach by replacing everything one piece at a time isn't the best troubleshooting technique. But, your video IS THE BEST because it shows the rest of us WHERE EVERYTHING IS and how to remove and replace them. I was wondering, though, wouldn't a code reader tell what was wrong? I think those old Fords had the OBD I connector to hook up to. If no code reader then there is another RU-vid video showing how to use a paper clip to get the codes from a flashing light on the dash. But, for the few dollars you spent replacing everything, you now have a truck that will run great and for a long time. It's nice having a no-worry vehicle. Well worth the time, effort and cost. UPDATE - I'm about to go see a guy with a 1994 F-150 4.9L but have been worried about all that tubing and wires under the hood. You showed me where everything is and what it does which eases my mind. Surely God has led me back to this video. I did see in another video where a fellow had the same truck and no one seemed able to find the cause of his problem. What it turned out to be was that very same part that went bad with your truck. But, what caused it to go bad was water inside the case. Apparently the owner had power-washed the engine and that got water inside the case. So the mechanic bought a new valve and sealed the cover on it and the truck ran good again as it did with you, too. I also just saw a Scotty Kilmer video about how to see if your catalytic converter is bad by testing the back pressure before and after the catalytic converter. I was wondering where the oxygen sensor was on the F150 to plug in the tester and you showed me - thanks.

I changed in order: spark plugs, ignition coil, fuel filter, vacuum hoses (all of them), distributor cap and rotor, throttle position sensor, idle controller, I have been looking at the egr, I have a brand new air filter, I was looking at the oxygen sensor today (found your video), I will look at the MAP sensor today and let you know what happens.

I hate to say but I may not have anymore videos on my ford. Someone boosted in when I stopped at QT on my way to the fire station, I had all my fire gear in it. If you happen to see a white ford 1993 f150 like the one in the video with license plate DKB-4848 please alert the authorities. It’s also posted on Facebook. I loved that truck so if you would keep your eyes open for it that would mean a lot to me.

Map = manifold absolute pressure sensor.

You just saved my weekend thank u bro!!

I see your video, and I yes fixed my truck, right now thank you so much for sharing, your knowledge, you save me a bunch of money 💰🙂👍

Thanks .you saved me time and money !!

Mines also doing this except on a 460 91 f250 and it stalls under any load thank God for the low end torque on these big blocks or I would've been stuck on a hill, any ideas if this could be the same thing?

was the check engine light on

Right on..no doubt now you're ready get a job as a tech at Ford dealer. I really appreciated very much everything About you. Very " HUMBLE " and down to the point. Not like other guy's first they talk about their pets, a whole life story. I can only imagine what you went through. Trying to fix your truck. A LOT OF TIME and MONEY AND I'M SURE FRUSTRATION..!! And now in just a few minutes 5, 10 minutes You have shared everything With people whom may have the same problem. " SAVING US TIME, MONEY AND HEADACHES. " YOU'RE AWESOME 👌 👏 THANK YOU SO MUCH FOR EVERYTHING.. I WISH I COULD BUY YOU A 🍺 🍺 🍺 BEER FOR ALL THE TROUBLE..!!

Great video man! have a '93 myself and have the symptoms you had. Luckily I have not bought a bunch of parts yet thanks to you! Cheers!

Throwing parts at a problem is your problem.

thank you for sharing, my truck, is having the same problem

This video coulda saved me so much headache if I had seen it a little sooner! Thanks so much for the advice buddy, great informational video. You are the reason my truck is running as we speak!

I replace that map sensor runs good for a week and now doing same thing ani idea

Get a Actron CP9690 tester. It checks live, record, oxygen sensor tests, smog readiness test, code connect to troubleshoot and MORE! Warm the engine to 2000 RPM'S for 2 minutes. After each repair, retest. If you get vacuum at the EGR at idle, replace the charcoal canister purge valve if it has one. If you get Oxygen sensor running rich codes, replace the MAP sensor if it has one. Usually it's not the EGR position sensor. Modules don't have codes.

Thee ah throttle make it happener and the gas thingamajiggy and spark hoses with that little whirly thing under the bumpy round thing... Sheeesh...

Was just telling my neighbor it is probably a map sensor, he's replaced everything you did that's the last piece.

I replaced all that stuff and it didn't make my truck run any better When the light comes on truck runs like crap when the light kicks off the truck runs good then

I just did the exact thing. I replaced EGR and Neutral safety switch. Still idled poorly. New MAP sensor and it runs good now. Thanks

Thank you so much, I found that problem. I have a v8 sensor and an i6 acm which can lead to wrong readings. It could also be because it has no power either. Thank you so much. Replaced o2 sensor, fuel filter, air filter, spark plugs, spark plug wires, and distributor. I also replaced the coil. It runs crappy still and I changed the vacuum leaks where it goes to a default state. It ran better I replaced a lot of other things and it didn’t change.

thank you for this video buddy! mine was doin this exact thing!!

Same exact symptoms but that part didn't do anything to my bronco

I had one that ran like crap on startup on the front tank but ran great on the rear tank turned out to be the fuel pump in the front tank not having enough pressure so if you try this and it doesn't work that could be the issue

Anyone Have any clue as to why my 2004 F150 4.2L V6 is having a hard time starting, I have spark and fuel pressure, it starts for maybe 1 seconds and then just shuts off by itself

Thanks!!

You said something about "throttle something". Were you talking about the Throttle Position Sensor?

Well after $1,000 and every weekend for several months sheeee sure do run better.

I’m having misfire and hard acceleration after driving it parking it and starting it back up again. Codes are misfire cyl 1, system lean, o2 sensor bank 1 sensor 2. Replaced distributor, plugs, wires, cap, rotor, air filter. Still having same issue

Whenever your vehicle is surging at idle 99% of the time it's your bmap sensor.

Youre awesome thank you!

I got a 1990 F150 4.9 liter. Had head rebuilt and changed all sensors and about everything else. 2 new fuel pumps. It runs good for about half an hour or so then starts trying to miss a little bit. I can't figure it out. Any idea??

Get a Actron CP9690 code tester. It checks live, record, graphing, emissions readiness test, oxygen sensor test, ABS, SRS, and MORE! It comes with a black pouch. It has a cigarette lighter cable. EBAY has it.

4.9L are really bad for the Fuel Pressure Regulators going bad. No Starts, long cranking time, running rough like yours, and poor performance also. Always rule out Fuel Pressure on the 4.9L engine. 50 -60 PSI is required for the Fuel System.

Skip to 5:13 to skip the “that’s not it” bullshit..... your welcome

Thank you

Try following diagnostic procedures

Funny how it always seems to be the last thing you try that fixes it... Lol

Change your oxygen sensor was having same problem now it’s gone

Terrific video!! I have a 96 302 engine and I have replaced almost everything including just recently the engine now I can’t make it run right. I am so frustrated!!!

Awesome job Sir

Thank you so much I've been having the same problem with my truck its been turning off and having the rpms fluctuate just like that ima try this and see if it works

Man I was told to buy all kinds of stuff for a bad idle and a backfire. Turned out to be Ignition control module. Now I have bad Fuel mileage and and a third gear hesitation.. kinda sounds rough. I'm told MAP sensor now.. lol.. I've replaced all kinds of stuff on first problem $370 worth... now I am expecting another big round of money to fix a simple problem I bet.. haha

Thank you sir!

That was very helpful...thank you. There is a vacuum driven heater motor just to the left of MAP sensor (top left corner if you're facing the firewall). I think it opends the vents inside the cabin. The vacuum hose is broken off n I dont know where it connects to. Any suggestions?

Mine is a 87 F250, second owner, 30k all original miles, with a 4.9 granny gear 4 speed, geared 4'11'1 rearend and front end, but is 13 mpg normal