How-To: Eliminate 4.0 SOHC 'jolt/buck' symptons - Page 2 - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #26  
Old 01-28-2009
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Quote:
Originally Posted by 04blackedge View Post
Wow try again, this time in english
sorry i am half paying attention.

But anyways.

I call bull.

I have k&n drop in. And i went to clean my MAf at 95k and it was clean like as if it were still new.
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  #27  
Old 01-28-2009
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First of all, you can not usually see when it is dirty. If it is dirty enough for you to see it then you have severe problems.

Second, Hook up an IDS unit or comparable scan tool and watch the MAF voltage spikes as you drive, replace the filter with a stock pleated paper element and repeat, you will notice a big difference.

Your MAF may not be in bad condition yet, or you may not oil your filter as much as the others did. It is still good measure for performance and fuel economy to do so. The smallest piece of lint or dust on that delicate filament can throw the air/fuel mixture off
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  #28  
Old 01-28-2009
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See my thread I posted about the same fix I had, spikes seen by the MAF. My truck trid to compensate so much that I was getting missfires from the readings the MAF threw out. And at highway speeds it felt very severe, to the point passengers would get concerned.

The air box lid wasn't closed completely cause my clip was broken off. A zip tie fixed it too.




Quote:
Originally Posted by toreador4x4 View Post
First of all, you can not usually see when it is dirty. If it is dirty enough for you to see it then you have severe problems.

Second, Hook up an IDS unit or comparable scan tool and watch the MAF voltage spikes as you drive, replace the filter with a stock pleated paper element and repeat, you will notice a big difference.

Your MAF may not be in bad condition yet, or you may not oil your filter as much as the others did. It is still good measure for performance and fuel economy to do so. The smallest piece of lint or dust on that delicate filament can throw the air/fuel mixture off
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  #29  
Old 01-28-2009
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My truck does this also, and it has a K&N. But the puzzling thing to me is, it did it with the stock filter in it too. I'd gotten used to it, figuring it was just a "quirk" of my truck until I stumbled across the other threads dealing with this issue.
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  #30  
Old 01-28-2009
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I think you can all just stop bickering and debating whether anyone is right or wrong. Its not a hard concept here. It happens to some people and not to others. Just because it happens to you doesn't mean it will happen to everyone. And just because it doesn't happen to you, doesn't mean it will never happen to anyone else.
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  #31  
Old 01-28-2009
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I wish more people would live like this

http://www.youtube.com/watch?v=6wS5xOZ7Rq8&feature=user
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  #32  
Old 01-28-2009
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I wish more people would live like this

http://www.youtube.com/watch?v=6wS5xOZ7Rq8&feature=user
LOL!!!
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  #33  
Old 01-28-2009
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LOL!!!

I've tried it. It really works.
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  #34  
Old 01-28-2009
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lol bs all the way dude i run a cone filter never had it mess with the maf so boo ya and this "how-to", then you think if it did it with the stock filter to that it wasnt that, if you cant solve a problem with a certain way then its something else duhh lol..........and cheers to not giving a f^ck

Last edited by Alex98; 01-28-2009 at 06:45 PM.
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  #35  
Old 01-28-2009
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i am a tech at a ford dealership and have done numerous experiments with my dads 04 LVLII and an 07 fusion on how the k&n causes MAF voltage spikes, i think id know more than you bud

also, you have a manual trans, the maf spikes effect the TRANSMISSION computer which you dont have...think before you talk
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  #36  
Old 01-28-2009
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I would be interested if he can put his old K&N back in, but just fix the airbox lid and see is the airbox leak was the problem like it was in mine.

To fix the airbox lid ANDchange the filter in one shot and automatically think it was the filter is premature thinking.

BTW - I am neutral on the whole K&N thing, so I am not trying to promote it in any way. I use a paper filter for the record.
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  #37  
Old 01-28-2009
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I had a K&N but since the FoMoCo filter fixed it who cares its fixed.
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  #38  
Old 01-28-2009
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well dont know to much about auto's, and you have a really good job to btw kinda wished i was one but idk

Last edited by Alex98; 01-29-2009 at 04:46 PM.
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  #39  
Old 01-28-2009
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Crunchy, The air box lid being loose can also cause the surging, which is what originally caused it on my dads truck. The stock air filter was in place and the air box lid was not locked down. This is what led me to experiment.

Jaycheetwood and alex98,you will not have a problem with a k&n filter causing voltage spikes. The trans computer gets a signal from the MAF sensor, and thats what causes the surging. If you have a manual trans, you have no trans computer, meaning the MAF is not linked to the trans in any way
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  #40  
Old 01-28-2009
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Jeez
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  #41  
Old 01-28-2009
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Quote:
Originally Posted by Ford04Ranger4.0 View Post
I had a K&N but since the FoMoCo filter fixed it who cares its fixed.

Negative on the problem 100% fixed. Did it at low speeds,like 25-30mph around 1500rpm in town. Only did it twice. I still have to pull apart the MAF and TB again and properly clean them.


Maybe if the rest of you guys whining and making a BFD out of this thread read the entire original post,you'd see that it's not even a serious how to.
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  #42  
Old 01-28-2009
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lol yea i know just messin around
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  #43  
Old 02-01-2009
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Yeah.....I clean my MAF at least once a year. I have a FRAM Air Hog (K&N knock-off) and often questioned the cleaning ability of high-flow oiled air filters.

If I change anythging, it will be going back to the stock paper filter or a dry-flow unit like the one on the AEM Brute Force.
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  #44  
Old 02-17-2009
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would putting in a aftermarket maf sensor solve the problem because i cleaned my
sensor and i still get the bucking.
does any one know where to get a maf sensor for the 4.0?
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  #45  
Old 02-17-2009
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have you had the pcm recalibration done yet? if you have a SOHC with an auto trans, there is a PCm update for the bucking/jerking as well
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  #46  
Old 02-17-2009
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Quote:
Originally Posted by Toreador4x4 View Post
i am a tech at a ford dealership and have done numerous experiments with my dads 04 LVLII and an 07 fusion on how the k&n causes MAF voltage spikes, i think id know more than you bud

also, you have a manual trans, the maf spikes effect the TRANSMISSION computer which you dont have...think before you talk
Being a tech at a Ford dealership does not necessarily mean you know more than everybody else. It does give you an advantage of knowledge of Ford products.

A Ford tech messed up the linkage adjustment on my manual transfer case when they replace the transfer case under warranty. I called the service manager about it and he told me he could find no instructions as to how to adjust it. I have a Ford repair manual and told him that I found the instructions. He asked for copies of it and I brought it to him with the truck so they could get it right. It was still messed up when I picked it up. After that I decided to do the adjustment myself, even though I could void my warranty. It took me less than 15 minutes to figure out how to do it and less than 5 minutes to make the adjustment. Problem solved but not because a Ford tech knew more than anybody else.

BTW, I have got a total of over 500,000 miles on vehicles with K&N filter with no problems caused by the filters. One of them has an automatic transmission and has over 110,000 miles on it. One is a carbureted vehicle so there is no MAF to foul. Another was an 89 Ranger and I don't know if it had an MAF to foul. Two other vehicles have MAFs but never did have any problems with them nor were they cleaned.
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  #47  
Old 02-19-2009
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Quote:
Originally Posted by Toreador4x4 View Post
have you had the pcm recalibration done yet? if you have a SOHC with an auto trans, there is a PCm update for the bucking/jerking as well
no i have the push rod version its a 97

i have been reading other threads on this and there is a possibility that i could be a solenoid in my transmission since i don't know if it did this before i bought the truck since the transmission was shot. and ill have to take note today but i think its always at the same shift point/ load. thanks
https://www.ranger-forums.com/forum2...ht=trans+thump

Last edited by skyway0018746; 02-19-2009 at 07:20 AM.
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  #48  
Old 02-19-2009
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Quote:
Originally Posted by IN2 FX4 View Post
Being a tech at a Ford dealership does not necessarily mean you know more than everybody else. It does give you an advantage of knowledge of Ford products.

A Ford tech messed up the linkage adjustment on my manual transfer case when they replace the transfer case under warranty. I called the service manager about it and he told me he could find no instructions as to how to adjust it. I have a Ford repair manual and told him that I found the instructions. He asked for copies of it and I brought it to him with the truck so they could get it right. It was still messed up when I picked it up. After that I decided to do the adjustment myself, even though I could void my warranty. It took me less than 15 minutes to figure out how to do it and less than 5 minutes to make the adjustment. Problem solved but not because a Ford tech knew more than anybody else.

BTW, I have got a total of over 500,000 miles on vehicles with K&N filter with no problems caused by the filters. One of them has an automatic transmission and has over 110,000 miles on it. One is a carbureted vehicle so there is no MAF to foul. Another was an 89 Ranger and I don't know if it had an MAF to foul. Two other vehicles have MAFs but never did have any problems with them nor were they cleaned.

I didnt say that i know more than others, i am just sharing my experiences and what i havbe found out relating to MAF voltage spikes and how it MAY cause a bucking/jerking symptom. Most techs at my dealership dont know **** and they rely on the computer to tell them what to do. I didnt say that a K&N will cause this symptom in all vehicles, or at all for that matter, just stating what i have found and it has helped a few people so im happy that i could help them
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  #49  
Old 02-19-2009
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Quote:
Originally Posted by Toreador4x4 View Post
The k&n filter oil isnt what caused the bucking, the excessive flow of the filter causes spikes in MAF voltage which causes the buck/jerk. the stock filter evens out the air flow and stops the voltage spikes
How is it then that hundreds of thousands of other cars with MAF sensors don't exibit this problem. Including my ranger.

Rich
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  #50  
Old 02-19-2009
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i cant explain it Rich, its just my theory. Im sure you would know better than I do, but thats what i came up with watching IDS readouts
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