Thread: 93 4.0 engine bogs???

My Ranger bogs badly after awhile of driving it all started after I relocated the intake into the cab the maf sensor is in about the stock location the engine is all stock I've tried cleaning the maf numerous times tried unhooking the intake tube before the maf when it bogs and even unplugging it an it still does it. When your driving you can feel it start to bog and if You floor it it will fall on its face then take off but if you cruz it around for about 5-10 min it will start bogging so bad that all it will do is idle I Have tried so many things to try to figure it out I'm lost now! Anyone Ever had this problem before? Someone please help me!

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sounds like the MAF is bad.
your engine doesnt have an intake temp sensor on the intake tube does it?

Yes it has one an that's the only sensor don't ask me why that I disconnected lol Im gonna hook it back up an see what it does I'm hoping it fixes it! By the way thanks for the deal on the trannys I'm on the second one an piecing the first one back together to Have another spare lol

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time for a tune up,,,,

It has new plugs wires o2 sensors oil change and air filter can't Have much more of a tune up on this engine lol

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id offer to hook it up to my scanner, but your in downey and im in menifee.
the best bet is try to get a scanner on it and check the injectors, and all the sensors. my 97 was running like shit when i bought it, and it ended up having the wrong throttle position sensor, the maf shouldnt make the truck bog, i ran my yellow ranger thats in my avatar for a few trips with the maf disconnected, just it wont want to idle or will have a very irratic idle. id double check the firing order and make sure the plug wires are hooked up in proper order. it could also be a bad coil pack. sheeit it could be alotta things, just check and re check everyting under the hood. if u can get the truck out here id be glad to help, but i dunno if you can.. good luck, let me know if u have any questions. i have 3 trucks with 4.0 ohv motors and they all have had their different issues, and they have all been pretty simple fixes so dont give up on it

Plug wires are correct I just scanned it and got code 341 some octane adjustment pin? What is this I'm searching Google but can't seem to find much

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Also its getting a reading for the intake air temperature? Isn't that the sensor that's in the intake tube?? Mine is disconnected how is this possible?

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thats why it's reading it, thats what the computer is suppose to do it's suppose to read the sensors and tell you whats not working properly or whats not connected and sends a code, your system is doing what it's suppose to do, try connecting it back up n that code will vanish, now for your your octane pin I suggest getting it over to 1nbredRanger he'll be able to help you.

It doesn't Have a code for the iat sensor that's what I don't get?

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help maybe??

93 4.0 code 341 what the heck is an octane pin??? - Ford Truck Enthusiasts Forums

the octane shorting pin or octane shorting bar is that little tooth looking thing in the wire harness near the ECU connector. take it out and clean it, than put it back in...
that sensor on the intake tube is an air temp sensor, make sure its orientated to get air flow. if its 90* off, it will make the engine run like poo

what type of spark plugs are you running? should use oe style plugs on the 4.0, it doesnt like anything else

Well didn't wanna start a new thread so I changed my plugs cleaned my maf and redid my return line and it seemed to fix the problem at first but now its bogging anytime its under a load and you give it more than 3/4 throttle?

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Oh and I got some autolite plugs from auto zone?

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Try new coil maybe? Ive had the same thing happen.

you may not have enough airflow going into the intake

Alright is there anyway to test it?

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Move the intake back into the engine bay drive it around and if it fixes the bogging that would be your problem

I was just thinking this too gotta try it next trip this thing is driving me crazy I'm so close to saying screw it an put a small block an Turbo 400 lol

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Hahaha that'll be pretty awesome! But one thing you gotta remember when you relocate the intake is that they put it in the engine bay because that's where the most airflow comes from and if there's no air flowing through the intake then your not getting the proper air to fuel mixture. So if you were to try making a vent or snorkel for the intake then it may just keep doing what its doing

Hahaha ya I know What your saying I don't Have any windows in it so I think it gets plenty of air but maybe my tube is too long and not getting enough volume? I'm gonna change the intake around and see what happens got my fingers crossed

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The worst thing about it is it only does it under a load not sitting in the backyard and its green stickered and I can't drive it around to see if what I do fixes it gotta tow it 120 miles to see if it works its getting expensive diesel for my tow rig ain't cheap lol

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Do you have a picture of the set up?

Haha that sucks! And it does sound like it isn't getting enough air

It's not an airflow problem.
Guaranteed it's a sensor issue.



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I have pics but damn phone won't let me post them? Kevin I've checked every sensor cleaned and even changed my maf any other ideas?

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If it started happening after he moved it, it can definitely be a possibility tho especially if he's checked all sensors

Try moving the MAF closer to the intake manifold, maybe it's so far from the engine it's causing a error in calculations.


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Originally Posted by half-ass astronaut

Try moving the MAF closer to the intake manifold, maybe it's so far from the engine it's causing a error in calculations.


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correct me if im wrong but shouldnt the MAF get the same reading even if it is closer to the manifold? he did say its in about the stock location

Well it gets the same air flow but I'm under the impression That the further away it is it gets a delayed reaction due to the intake tube being so long if that makes sense?

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im not a 100% but my trucks doing a similar thing ill be driving and wen i get on it the check engine light well come on and it well bogg then the check engine light well go off and on it also gets hot and starts to sputter i just put a stroked 4.0 in it with headers and strait exhaust my frend says i need to change the fuel pump but idk if that would make the check engine light come on im also frustrated with this truck

Didn't see that the MAF was in the stock location.

Hesitation is usually a ignition issue, not an air supply issue. You need to rule Out every sensor in that thing.


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If there was a ignition issue shouldn't there also be a misfire happening then also?

That's kinda what I thought also my plan is to move my intake how I used to have it an take it out hopefully it'll fix my problem got my fingers crossed probably won't be able to get out for a couple weeks though :-/

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i had my air filter in cab with MAF sensor all the way agaisnt the cab and it worked fine..when mine did this it was the coil pack i would get an new one to take with you to try out when you go out if it doesnt work just return it.

Originally Posted by havoc

If there was a ignition issue shouldn't there also be a misfire happening then also?

Ignition issue doesn't mean a misfire, misfire is from shitty timing(IE backfire)
Usually when you have a hesitation or stumble, it's from an ignition issue, like bad plugs, faulty spark wires, or a coil pack fucking up.

Air,fuel and spark are the three things we need to investigate : air-check, fuel-check, spark......
Rangers are known for sensor issues, and usually don't cause major problems, but since the engine relies on strictly sensors, it's safe to assume that is your problem.


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Did you happen to move your ICM (ignition control module). black square box with "motorcraft" on it, looks like an aftermarket tuner kind of.
if that case does not have a really good ground, it will cause problems like this, am I right Mikey? Taylor?


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Pl ill pick up a coil pack too and see what happens also yes I moved the icm it's basically in the stock location but bolted to my cage with 1/4-20 bolts and star washers

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Any luck?


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