bawg issue

[bronco8923]

so ive got the 1989 xlt bronco 2 4wd n shit.. so when i let the truck warm up i put in gear to go and itll go for a few then everytime i hit the gas the truck seems to bawg, loss of power.. not battery juice loss im talking like a bad fuel filter does but thats not it.. ive checkd the ox sensor, n all that good stuff. but when i dont let the truck warm up shell go just fine. but why is it shes only doing it when shes warm.. ive done fuel injecters, pickup coil in the dis shaft. the timing is fine, plugs, cap and rotor replaced. pcv valve is changed, fuel pump is working fine ive done alot but its this one thing.. HELP ME PLEASE...your guess is as good as mine.. vacum?air? WHAT??????????????

 

[BlackBII]

Engine Coolant temp sensor maybe?
Could be sending bad signal for when your truck gets warmed up

 

[bronco8923]

ill check it out.. hey would it do anything diff if i have it running and unplugg it??????? do you know to check them????

 

[Psychopete]

ill check it out.. hey would it do anything diff if i have it running and unplugg it??????? do you know to check them????

....If you can find a temperature vs. resistance chart... I suppose if nothing was getting to the PCM, then it would be definitely bad then.

Pulled codes?

How did you "test" the o2 sensor? If you haven't already done so, you can unhook it temporarily (make sure nothing can melt to the manifold) and see if the problem still persists. The PCM will use values from a built in table, but it will run a little rich. If it gets better, your o2 sensor is foobared.

Pete

 

[bronco8923]

ive tested the ox sensor.. unplugged it and ran.. still had the problem..also just changed out the air chargning sensor..cant pull codes, there is no check engine light or anything..

 

[bronco8923]

so ya i just tested the coolant temp sensor........wasnt that.. any other ideas?????

 

[IMenriched]

Air temp sensor?
How carboned up is the upper intake?

 

[bronco8923]

well thats what the comp is tellin me.. see what i dont get is before she does it she runs awesome....ill swap it out...

 

[bronco8923]

real quick.....when i start her up she run s great and idles fine.. but after she reaches that temp she shuts off and wont start again for about 5-10 minuets later..................

 

[BlackBII]

Maybe TFI module getting too hott?

 

[bronco8923]

ya that was the first thing on that truck i had to replace..... the exhaust smells rich(cat is gutted) so i dont know if that is why but ya........thanks man but everything on that shaft is new.. ign module, coil pick up.....

 

[IMenriched]

ya that was the first thing on that truck i had to replace..... the exhaust smells rich(cat is gutted) so i dont know if that is why but ya........thanks man but everything on that shaft is new.. ign module, coil pick up.....

Might concider taking a closer look at the TPS (throttle position sensor) too.
If'n the air temp sensor isn't the issue.

How is the cat??? It isn't getting plugged up??

 

[bronco8923]

the cat is empty, didnt know it till i put a stick on in it.. the tps is workin fine as wine.. took it out and cleaned it already.. tests fine

 

[IMenriched]

the cat is empty, didnt know it till i put a stick on in it.. the tps is workin fine as wine.. took it out and cleaned it already.. tests fine

Sorry missed that you mentioned the cat being gutted earlier.
are you running a free flowing muffler?? Thought I read somewhere some others were had issues with not enough back pressure with a gutted cat, giving the O2 sensor fits...then making engine run crapy.

It is WAY late in this thread to ask...but how is the air filter??
How is the compression?

have you made sure that all the ports for vacuum lines, into the upper intake are open...no carbon blocking them??

then you maybe down to a vacuum leak of some kind or back to the coolant temp sensor, the one for the engine computer.

 

[bronco8923]

well as far as i cant tell its clean as ass paper.. ive down a water boil test to the comp coolant temp and it tested fine.. and as far as i know theres no vacum problem.. i also rented a comp tester for autozone and it tested fine.. and tested the 02 oxy, unplugged it and ran it and still had the problem. and what you mean givin the 02 sensor fits?

thanks