Runs but not right

[BIGRED911]

When my grandmother passed away last December i aquired "my" first truck again....ive drove the pickup since i was 16 but it was never mine...anyway its a 92 F150 auto w/ push button 4x4 only has 89,000 miles on it 40 some of which i put on before bigred.....anyway its been idling way up(no tach so no idea how high) and when drivin on the hiway it will drop out of od all the way to second gear then jump back to od ect....it will now idle back but almost dies then itll rev back up....ive pulled every vaccum line and it just revs more, coverin it doesnt do anything either....oh its a 5.8 and when its runnin right itll scream!

 

[F150]

throttle position sensor.

 

[Fellro]

^^^^^ Sounds a lot like when my TPS failed, except the overdrive since mine is manual. It would make sense though as well. If you want to check it before actually installing, I hooked up the new one before actually doing anything, and the idle came back almost immediately. Mine was really revving when it started to show up. I was putting up snow fence in the dark, and the truck would just revv way high, then back down, then up all by itself with nobody in the cab.

 

[BIGRED911]

Thats what ive been thinking, guess ill be doin that next time i get home.....

 

[BIGRED911]

Parts list for next time im home....
Fuel tank( back one was removed 4-5 years ago and front one now has a leak at 1/2 tank)
Tps...
Lots of carb cleaner...
Air filter( maybe cold air set up?)
Someday a new set of 31 10.50 dynapro mts
A new set of rear leaf springs( might just take the one opposite of the broken one out)
New dual exhaust( rusted off and gone from cat back)
New front bumper
And one of these days all the dents knocked out and a fresh coat of color matched bedliner head to toe....current pics when i get home...

 

[Alvin in AZ]

Parts list for next time im home....
TPS {reporter}...

New IAC and clean the old IAC too.

Ok, what a bunch of us has fiNgured out over on FSB is the IAC's don't clean
up so good. But it's cool to clean it and see the difference it makes. If after
cleaning it's "good enough" use it, I guess?

E4od OD trouble has been fixed by changing out the left front turn signal bulb.
(i believe it's that bulb, ever heard of that Ford-weirdness before?
Maybe yours has just got a bad connection from having been sitting -and-
being in the rust belt both?

Anyway there's a procedure for re-adjusting the throttle body's throttle stop
screw that involves the IAC. Best to have a new IAC installed while adjusting
it.

Alvin in AZ

 

[BIGRED911]

New IAC and clean the old IAC too.

Ok, what a bunch of us has fiNgured out over on FSB is the IAC's don't clean
up so good. But it's cool to clean it and see the difference it makes. If after
cleaning it's "good enough" use it, I guess?

E4od OD trouble has been fixed by changing out the left front turn signal bulb.
(i believe it's that bulb, ever heard of that Ford-weirdness before?
Maybe yours has just got a bad connection from having been sitting -and-
being in the rust belt both?

Anyway there's a procedure for re-adjusting the throttle body's throttle stop
screw that involves the IAC. Best to have a new IAC installed while adjusting
it.

Alvin in AZ

Was thinkin bout doin that while i was there....flippin the butterflies open, it looks plumb nasty in there....and yah the turn signal dont suprise me but usually it drops clear to second gear, and thats usually when it tries drivin itself....somebody told me to unhook the cruise all together, cable and all, i never use cruise anyway so thatll go too....did notice when it does deside to run halfway right it shifts hard....ive put most of the miles on it and a majority of them were hard fought miles, but it was in show room shape and ran like a top till my mom and brother took it over after i got bigred....

Gunna trim the rust from the fender wells and put flares on instead of patchin( per local body mans request...)

 

[Alvin in AZ]

...usually it drops clear to second gear, and thats usually when it tries drivin itself...
....did notice when it does decide to run halfway right it shifts hard...

Hey, is that thing going back and forth between "working kinda bad"
and going into "limp-home mode" by any chance?

"your transmission is dead $1200 to $1500" -mechanic to my wife

{she wanted to "take care of it herself" see? LOL}
{"ok, so since the car's totalled, can I have a crack at it? " -Alvin}

I fixed it with a new neutral safety switch ~$100.
Read on FEOA that it was simply in limp-home-mode.

Alvin in AZ

 

[BIGRED911]

I wouldnt think in limp home mode i put it to the floor and itd go ahead and grab 3rd( at about 80) oops....and if it was the safety switch itd would start in gear wouldnt it?

 

[Alvin in AZ]

1) I wouldnt think in limp home mode i put it to the floor and itd go ahead
and grab 3rd( at about 80) oops....

2) and if it was the safety switch itd would start in gear wouldnt it?

1) I don't know! LOL

2) "neutral safety switch" is a misnomer anymore, it's way more than that.
It's the way the EEC "knows" what you've selected for one.

Alvin in AZ

 

[BIGRED911]

Tps and iac removed...cleanin iac as i just have today to do this and nobody in 30 miles has one......headin to get new tps and carb cleaner.....

 

[BIGRED911]

Cleaned IAC and installed new TPS....cleaned trottle body and....WOW...NEW PICKUP!













Next time home its new fuel tank time.....

 

[BIGRED911]

Well now the question is, when i order my 13 gallons of Amsoil 15w40 for my isx for the summer, do i order 10w30 or 20w50 for the pickup? Its needin changed and if i have MY way, everythin i own is gettin switched to Amsoil...i just put 0 weight( what it called for) in my 4stroke weedeater two weeks ago! Noticably less vibrstion....

 

[Fellro]

Personally, I'm not a fan of 20W-50 for street use, but that is my opinion.

 

[BIGRED911]

Personally, I'm not a fan of 20W-50 for street use, but that is my opinion.

Its had kendall 20-50 in it from 01 to 05( had a sponsership for our race team and it was free) but im not sure whats been used in it since...

 

[DNFXDLI]

I don't see a huge issue with it...my car came factory with 5-50 and as you know, the synthetic flows better.