SOHC 'jolt' at cruising speed - 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 01-25-2009
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Ok but i kno its not my plugs with 40,000. If i go with plugs im going with Denso Iridium Plats
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  #27  
Old 01-25-2009
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man i had brand new plugs lol and then replaced the brand new ones
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  #28  
Old 01-25-2009
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Yeah and these are stock if i had the thump it would be all the time, thus the name "spark plug" so no im ruleing that out.
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  #29  
Old 01-25-2009
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im tellin you just take them out and if they look "burned" youll prolly have to replace them, one thing knocking is caused by is hot spots and i guess the ones i had didnt burn everything evenly and thats why it knocked, and no mine happend when you put a considerable amount of strain on the engine in the higher gears right? 4th and 5th more 5th tho but around 35-45mph at 1500-2000rpms
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  #30  
Old 01-25-2009
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knocking? when did we state in this thread engine knocking?? we are talkign about thumping such as in the trans or motor
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  #31  
Old 01-25-2009
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knocking, jerking, hesitating, misfiring many different terms and its not the trans
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  #32  
Old 01-25-2009
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even if that tach doesnt spike??
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  #33  
Old 01-25-2009
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it never did for me, does it for you? you have an auto or manual?
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  #34  
Old 01-25-2009
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auto, and no. Maybe i'll do it soemtime I heard its a PINA to change plugs on the 4.0 SOHC
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  #35  
Old 01-25-2009
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alright yea your problem sounds exactly like mine use to be, but yeah if its not what im tellin you then my bad but ive always had that problem associated with spark, i replaced the fuel filter, iac, iat, tps, maf, throttle body, and all the o2's and still nothing
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  #36  
Old 01-25-2009
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WTH is IAC and IAT, did you clean teh throttle body?
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  #37  
Old 01-25-2009
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nah just replaced it (lil bit of a stick) your not supposed to clean it really but the iac is the idle air control valve, and the iat idle air temp, iac controls how much air enters the engine when you let off the gas, and the iat is simply a therm. that tells the computer how much fuel to use along with the maf
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  #38  
Old 01-25-2009
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you clean those or replace them? i plan on calling Justin and hes going to walk me through the cleaning of the mass sensor.
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  #39  
Old 01-25-2009
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Clean them. Cleaning the MAF sensor is super easy, take it out and spray it with some electrical parts cleaner.
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  #40  
Old 01-25-2009
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lol yes clean maf, iac, and iat, but not throttle body $30 or less at a junk yard with low miles if you look hard enough well all of them are around $10 but they are small if you know what i mean
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  #41  
Old 01-25-2009
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IAC is intake air temperature, it lets lets the PCM know how dense the air is so it knows how much fuel to deliver

clean the throttle body, i know they say not to because of the teflon coating it has, but if there is carbon on it, the coating isnt doing its job anyway

do not use bosch platinum +4 plugs, the 4.0 is lean for emissions, and it will get hot enough to burn one or more of the electrodes off and have em drop down in the cylinders, seen it happen numerous times at both of the shops ive worked at, happens on 4.0, 4.6 and 5.4s alot.

plugs are failry easy on SOHC motors except for the one in the passenger rear but it isnt that bad. clean everything first as i told you though
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  #42  
Old 01-25-2009
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Quote:
Originally Posted by crazymikey View Post
Great explaination Bob. Makes total sense.

I was also iffy about why you have to oil an air filter, just for the fact it would make sense that the oil and crap gets sucked up.
We have to deal with K&N air filters through customers at work (I work at a Yamaha Dealership). It is very easy to over-oil the filters. I had one on my truck for about a year, and it fouled my MAF. I got nearly the exact same problem that you had, and after I cleaned it, it went away. I took out the K&N and now I run the AEM filter. I wanted to stick with a serviceable air filter, and the AEM is a dry flow (meaning no oil needed).
Here
http://www.aempower.com/ViewCategory.aspx?CategoryID=93

I hope you clear it up before you go to Alberta
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  #43  
Old 01-25-2009
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Hey! My 06 4.0 does it and my dads 04 3.0 does the same thing. It the different plugs ford runs on the different banks. Its normal. Mikes truck does it too.
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  #44  
Old 01-25-2009
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its not normal, there are ways to fix it. your 06 has the PCM recal. TSB on it
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  #45  
Old 01-25-2009
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Well you learn something new everyday!! thanks!! i posted up about this when i first bought and was pretty much told it was somewhat normal, and my dads 04 3.0 does the same thing!!
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  #46  
Old 01-25-2009
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the only recall i can find is the wiper motor grease. TSB's on different stuff but didn't find anything on PCM. I'm not sayin your wrong but that's all i could find from many different sites.
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  #47  
Old 01-25-2009
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Quote:
Originally Posted by toreador4x4 View Post
its not normal, there are ways to fix it. your 06 has the PCM recal. TSB on it
Link to it?
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  #48  
Old 01-25-2009
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posted on the first page by mark
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  #49  
Old 01-25-2009
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Quote:
Originally Posted by Ford04Ranger4.0 View Post
I have the auto 5R55E, I've done the trans flush and filter but next im going to do is the EPC since it fixed it for Yamanube. I've been researching this for the past 3 months but now is Justin helping me out trying to fix it.

Mine did it between 40- 55 mph areound 2- 2500 rpms

Heres the TSB

TSB
05-5-8 SURGING SENSATION DURING CRUISE AT STEADY SPEEDS OF 35-50 MPH (56-80 KM/H) - 4.0L ENGINE

Publication Date: March 4, 2005

FORD: 2004-2005 Ranger


ISSUE:
Some 2004-2005 Rangers equipped with a 4.0L engine and an automatic or manual transmission, may exhibit a surge sensation during cruise at steady speeds between 35-50 MPH (56-80 Km/h). The condition will occur after a cold start and may continue for approximately 5 miles (8 Km) or 5 minutes.

ACTION:
Reprogram the powertrain control module (PCM) to the latest calibration level using WDS release B35.9 and higher, or B36.2 and higher. Calibration files may also be obtained at www.motorcraft.com.

NOTE: THIS NEW CALIBRATION IS NOT INCLUDED IN THE B36.0 CD.




WARRANTY STATUS:
Eligible Under Provisions Of New Vehicle Limited Warranty Coverage And Emissions Warranty Coverage

OPERATION DESCRIPTION TIME
050508A 2004-2005 Ranger 4.0L: Check For Diagnostic Trouble Codes And Reprogram Powertrain Control Module (Do Not Use With 125650D, 12650D84) 0.4 Hr.

DEALER CODING
BASIC PART NO. CONDITION CODE
RECALEM 04

--------------------------------------------------------------------------------

NOTE: The information in Technical Service Bulletins is intended for use by trained, professional technicians with the knowledge, tools, and equipment to do the job properly and safely. It informs these technicians of conditions that may occur on some vehicles, or provides information that could assist in proper vehicle service. The procedures should not be performed by "do-it-yourselfers". Do not assume that a condition described affects your car or truck. Contact a Ford, Lincoln, or Mercury dealership to determine whether the Bulletin applies to your vehicle. Warranty Policy and Extended Service Plan documentation determine Warranty and/or Extended Service Plan coverage unless stated otherwise in the TSB article. The information in this Technical Service Bulletin (TSB) was current at the time of printing. Ford Motor Company reserves the right to supercede this information with updates. The most recent information is available through Ford Motor Company's on-line technical resources.

Copyright © 2005 Ford Motor Company
here
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  #50  
Old 01-26-2009
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It can't be my plugs. I've had brand new NGK V-Power plugs installed for exactly 1 week now.

I am definetly ruling the problem out to be my air filter. It makes the most sense. I'm going to go out now and take a look at things and clean stuff up and take it for a test run.

If it is a spark or iginition related problem, then it would happening constantly. It would start rough and idle poorly and hesitate all the time on the road, which is not the case.

It's just driving down the road and all of a sudden the truck just jolts for like a second, like a heart skipping a beat.
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