95 bronco 302 running rough need some pointers

[aquaholic33]

i HAVE A 95 BRONCO with a 302 EFI. Truck runs great except at very low throttle. At idle there isn't any missing and all ranges of throttle responce is great except for it i just slightly touch the gas. I mean maybe 2-5% of the peddle. I cann't figure it out. I changed the plugs wire cap and rotor no help. new air filter fuel filter oil change pcv cleaned map senser and even replaced the TPS. Any ideas????? I am out.

problem is it's kinda bogging and hesitation. as soon as i add alittle more throttle problem gone.

 

[ford_zilla]

i had the some problem on my 87. well it sounds like what happen to mine. i found that the EGR valver was stuck open, so at idle the exhuast was being pumped in heavy and once i took the rpms up a touch it was fine. i replaced mine and haven't had a problem since

 

[ms329]

i HAVE A 95 BRONCO with a 302 EFI. Truck runs great except at very low throttle. At idle there isn't any missing and all ranges of throttle responce is great except for it i just slightly touch the gas. I mean maybe 2-5% of the peddle. I cann't figure it out. I changed the plugs wire cap and rotor no help. new air filter fuel filter oil change pcv cleaned map senser and even replaced the TPS. Any ideas????? I am out.problem is it's kinda bogging and hesitation. as soon as i add alittle more throttle problem gone.

Does it happen when its cold or all the time?. Have you checked your coolant tempeture sensore and coolant it's self? I just did this yesterday, The car was cold starting untill I ran it for a few minutes. Even when running at idel its was a litle shakey. I pulled the sensor, cleaned it, and flushed and changed out my fluid so I am good for 34 below ( I live in Michigan) I ran the engine and let it circulate. SHut if off for 3 hours and when I went to start it bam no problem. I let it sit overnight outside for 9 hours, 16 w the wind chill last night, and bingo started right up. Apparently the sensor tells the computer as to how the FI system should work due to temp from the coolant.

I got the tip from a vet Ford Mech.

Give it a try

 

[aquaholic33]

Does it happen when its cold or all the time?. Have you checked your coolant tempeture sensore and coolant it's self? I just did this yesterday, The car was cold starting untill I ran it for a few minutes. Even when running at idel its was a litle shakey. I pulled the sensor, cleaned it, and flushed and changed out my fluid so I am good for 34 below ( I live in Michigan) I ran the engine and let it circulate. SHut if off for 3 hours and when I went to start it bam no problem. I let it sit overnight outside for 9 hours, 16 w the wind chill last night, and bingo started right up. Apparently the sensor tells the computer as to how the FI system should work due to temp from the coolant.
I got the tip from a vet Ford Mech.

Give it a try

well my probelm happens all the time. hot or cold. Good tip about the sensor though. Thinking it might be the egr, i am going to replace and see if it works

 

[BroncoJoe19]

I am a bit of an old time back yard mechanic, and I doubt if this will be of help. However the older engines used to have a vaccume modulator beside the distributer to act as a timing advance. After the engine picked up enough RPMs a centrifical advance took over. IF the vaccume modulator had a broken diaphram, or the vaccume hose was disconnected, you would get similar reults.

I mention this only to get you tinking about whatever controls the timing advance in the newer engines.

Joe

 

[stusainte]

I have a 95 302 5.0 also mine was doing the same thing would not maintane a speed or when going up a hill had to olmost put my foot on the floor for it to move what I had found after the prosses of elimanation was i opend the airfilter box put in a new k+n filter and drove around with the filter box open and that took care of the problem guess she was not breathing very well So i got a k+n filter kit and she's been good ever since Hope this helps or somthing to think about Good luck