car hesitates or stumbles

[my86GT]

when i start my car and go down the road it hessitates or stumbles like its not getting fuel then it will go away. it seams it does this everytime i start the car once it goes away it wont come back till i restart it. im just confused those this sound like the fuel pump is going out or what?. i ran codes KOEO and all i get is code 95 ive errased it 2 times but it keeps coming back. can someone please help me with this its really making it frustrating driving the car.

thank you
Hugo

 

[ninety15.0]

Does this only happen when the car is started cold...or will it happen when the car is started hot as well? My car used to do this also...especially when it was cold. After tuning the car with a tweecer and deleting the EGR and Thermactor systems...the problem has gone away. Are you running EGR? Do you have a check engine light or is this code stored in KAM?

 

[SVT32VDOHC]

My 5.0L notchback had stumbling problems in higher RPM's. My plugs were worn out to .070!!!! I bought new Motorcrafts gapped them at .048 instead of the manufacturers .054. My car runs great. But, unlike your car, mine ran fine at start up at under 4,800 RPM's.

 

[my86GT]

it does it hot or cold, im not running EGR. i have an EGR dummy plug that makes the computer think there is one there and working fine.

 

[86bluecobra]

check your plug gap and have a look at the voltage your TPS is sending. It could be an issue with it sending the wrong info to the computer when you accelerate.

 

[jrichker]

Code 95 - the following test path is for 86-90 model Mustangs.

The 95 code is because at one time or another, the fuel pump relay hiccupped and didn't provide power the pump when the computer told it to run. Sometimes this is a one time thing, other times it is a no run or runs poorly condition.

To help troubleshoot the 95 code, follow this link for a wiring diagram http://www.autozone.com/images/cds/gif/large/0900823d80167162.gif

Using the diagram, check the red/black wire from the fuel pump relay: you should see 12 volts or so. If not, check the inertia switch: on a hatch it is on the driver’s side by the taillight. Look for a black rubber plug that pops out: if you don't find it, then loosen up the plastic trim. Check for voltage on both sides of the switch. If there is voltage on both sides, then check the Pink/black wire on the fuel pump relay: it is the power feed to the fuel pump. No voltage there, check the Orange/Lt blue wire, it is the power feed to the fuel pump relay & has a fuse link in it. If there is good voltage there & at the Pink/black wire, swap the relay.

Some Mass Air conversions neglect to run the extra fuel pump wire, and they always have a 95 code. See http://www.stangnet.com/tech/maf/massairconversion.html for more information on the Mass Air wiring conversion.

 

[my86GT]

ill go and check out the diagram you sent me and let you know how it comes out. when i did my conversion i did run that wire from the fuel pump relay to the #19 pin hole. TPS is reading .98v so i should be there and the plugs are gapped right.

 

[my86GT]

i did the check, i have power to the red/black wire when i turn the key to the on position and nothing on the off. is this how it should be, ive replaced the fuel relay yesterday so it has already a new one in it.

 

[my86GT]

ttt

 

[my86GT]

still having no luck