When I unplugged the map sensor (which defaults its abilities) it still ran terrible and idled beyond terrible. Injectors is my next "to buy" item. Plan on getting the Generation3 injectors with the old style plug. They are suppose to be alot better than stock. They have 4 holes that spray fuel as apposed to 1. Doubt it is an injector mainly because it runs really strong when it's cold. If an injector was bad, think it would act accordingly all the time, not just when the car is warmed up. BTW Mark, Holy crap! With the setup on your car that could be a number of problems but i bet on 5cylinders it's faster than mine on a good day, sheesh!
I tried following it on the wire diagram above but can't figure it out. Can someone tell me what the small plastic sensor/relay box looking thing that is mounted to my drivers side fender wall with a plug stuck in the bottom of it is? Looks like 4 wires on the plug connector.
After all the time and money spent maybe I should have removed and checked injector O rings earlier. Apparently that WAS the problem and my baby is running like a dream! CHECK FUEL INJECTOR O RINGS!!!!!!!!!!!!!!! Thank you so much for everyone's input on the situation. I appreciate it beyond compare. It was a bad o ring allowing air to be pulled into the cylinder once the engine was warmed up and the metal around the o ring expanded enough to let air by. I am possibly the happiest gearhead on the planet right now.
After all the time and money spent maybe I should have removed and checked injector O rings earlier. Apparently that WAS the problem and my baby is running like a dream! CHECK FUEL INJECTOR O RINGS!!!!!!!!!!!!!!! Thank you so much for everyone's input on the situation. I appreciate it beyond compare. It was a bad o ring allowing air to be pulled into the cylinder once the engine was warmed up and the metal around the o ring expanded enough to let air by. I am possibly the happiest gearhead on the planet right now.
i have a 91 mustang with a 342. i am wanting to know if anybody can tell me what might be wrong. the problem i am having is at about 2000 rpm my car starts to sputter and then makes 2 loud pops from what sounds like its coming from the bottom of the motor and then just takes the heck off like it is suppose to. any suggestion would be appreciated. i want to maybe narrow down what it could be. and what should my timing be set at i have at 10* btdc.
Please start your own post and I will try to help you. Piggybacking on someone else's post is bad manners, like showing up for dinner uninvited. It is not very effective since the problem has already been resolved for the owner, and people will overlook your questions.
on my 92 it was the pip now I added an 85 to the stable and it’s doing similar thing but it’s not that , I read an article earlier that I’m hoping it’s not cause I just built this motor and it’s saying a blown head gasket could cause full throttle misfire but fine during normal driving .Now that sounds like something that could have been the problem which is why i installed a brand new distributor 3 days ago. Still having the same issue. When i run cylinder test it constantly gives different codes. I.E. first time i got code 8, i moved sparkplug in cyl 8 to cyl 7 then reran test. It gave me a 7,2,and 1 as being problematic. I have run the cylinder test many times and each time it gives different cylinders as problematic. Have brand new plugs and wires, new distributor, proper fuel pressure to the rail,brand new MSD TPI, new cap and rotor, new ford racing pushrods,have switched out EEC for a spare and still no change after the car warms up. There is a huge difference when it is cold as it idles much better and runs very strong which is expected in a car that has had $1200 worth of brand new parts. As it warms up, it gets progressively worse from spitting and sputtering at 5k to 4k then finally all the way down to 3k which is the cutoff. This happens even if I'm on partial throttle anything over 3k rpm after the car has come to full operating temps and its spit, sputter and backfire city. I apologize for the egr rant. I'm just really fed up with this issue and spring is here. I want to be at the track and this problem is killing my season so far. I have this posted on many Mustang forums and noone has a clue. I'm getting close to going carbureted and being done with it.
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