stutters badly over 3,000 rpm

[WNY964x4]

Sounds as if the PCM doesn't know it's in Drive.

Transmission Range Sensor?

the pcm doesnt do much with the trans except to tell it when to upshift based on speed and rpm inputs , so the range sensor would have nothing to do with it , all the range sensor really does it tell the pcm when the trans is in park or neutral for starting , other than that , if the trans is in drive and the pcm sees a change in vehicle speed and rpm's , that pcm is perfectly content , plus if the pcm didnt know it was in drive the truck would not move at all and obviously he is driving it

 

[Earl43P]

If the Trans Range Sensor sends a neutral or Park signal to the PCM, the PCM limits the engine rpm to 3000, which is what he describes.

 

[Psychopete]

it was deffinently not the maf since a bad maf would cause it not to run at all

A lot of people have pinging issues caused by a dirty MAS, but engine still runs.

i hate to undermine anyone on this site, especially hahns, since i was a boces student for auto tech, and i worked at a parts store

When I was in college, I worked for a John Deere dealership as a service "manager". Frequently, I would work the parts counter. I will also readily tell you that I don't know a damn thing about working on a John Deere. FWIW, I did change a deck belt for an elderly customer once for free .

Pete

 

[WNY964x4]

If the Trans Range Sensor sends a neutral or Park signal to the PCM, the PCM limits the engine rpm to 3000, which is what he describes.

yes but if the trans range sensor sensed that it was only in park or neutral the truck would not drive , it would only sit there and rev , he stated that under accleration he had the problem , which means he was driving down the road

A lot of people have pinging issues caused by a dirty MAS, but engine still runs.



When I was in college, I worked for a John Deere dealership as a service "manager". Frequently, I would work the parts counter. I will also readily tell you that I don't know a damn thing about working on a John Deere. FWIW, I did change a deck belt for an elderly customer once for free .

Pete

well i am in college now and have basically quit my job at the parts store , i hated working there , i mean i liked my coworkers but i am not a people person , i am in college for auto tech , i attended boces for auto tech , i was in the natef and ayes programs , and i passed all 4 end of year exams my first year when we had only covered 2 of them , i spent 10 weeks during the summer of 07 working in a repair shop , i am more of a mechanic than i am a parts guy , i am not saying i am infallible , but i have been working on cars since i was 9 , i got my first when i was 12 , and i got my first ranger when i was 15 , i was just stating that most of the maf problems i have ever run into was when the car would not run for more than 5 to 10 seconds before stalling out

 

[Half Nuts]

cat-back straight pipe(no muffler)

THERE'S your problem!!
Ive got an '02 that does the same damn thing, only intermittently. Occasionally while on the road (read: with load on the engine) if I stomp the gas and the Trans kicks down, the motor will rev up to almost exactly 3k and stutter away. It's scary when that happens at 40+ mph.
The only similarity between our setups are that we've got modified intake and exhaust systems.
The stock intake system upstream of your TB already flows WAY more than the motor could ever handle stock, so that's irrelevant.
The stock exhaust, however, is designed to provide the engine with a certain amount of backpressure.
I'm not Wicked Sludge, so I can't explain in the same words he would use, but I can tell you that (from my limited understanding of the principle) backpressure has a hand in determining the fuel/air ratio present in the combustion chamber, which if it is wrong will lead to all kinds of nasty things, knock, ping, detonation...
Your truck has sensors that will sense these nasty conditions and reset spark timing so that the engine doesn't try to blow it's self to hell.

Try idling in a driveway in park (or neutral). Run your revs up to 3k and see what you get. I'll bet you dollars to donuts it revs smoothly to that mark and then stutters and acts like crap.

Tl;Dr
you need a good muffler to provide back pressure.

 

[DaBen]

Old thread I know, But I gots this problem too

My truck 02 Ranger Edge 2wd 3.0l auto 120k. Stock intake with a 2.5" glass pack to a 45* turn exiting in front of rear tire.
The exhaust has been on for over a year. 3 months ago while getting on the highway I kicked it down to get moving and at about 3k rpm it started sputtering. Not a miss but almost like the truck is going to shut off. It does this in rapid succession. No black smoke from the exhaust, no back fire, and NO CHECK ENGINE LIGHT!

What I've done: Brand new(from ford) PCV valve assy with the heater tube and the long tube that goes into intake. New hose from intake tube(short approx. 2-3in.) to intake mani. and today I did a new fuel filter. I think tomorrow I will do a youtube video to show you. But until then has anybody had this issue and been able to resolve it.