i recently finished (end of summer) my KLZE swap into my 93' mx-3 gs. it ran great and started up every time for a couple weeks. then soon after i noticed i didnt hear the fuel pump come on when i turned the key to the ON position.
the car still started fine. when it started getting colder like in october i found that i couldnt start my car n e more unless it was warm outside (85+) or i recently shut it off. otherwise i would have to push start it and pop the clutch.
Last week i was in shop all week (i go to the University of Northwestern ohio; I'm going for a bachelor's degree in high performance) and instead of doing my work packet, me, the teacher, and a few classmates helped me on trying to figure out my car. symptoms:?
1. starter cranks very good- amp draw is only around 250
2. there is no fuel pressure when the key is on unless we ground the light green wire going to the diagnostic port
3. in cranking position, there is 42 psi present
4. we checked all relays, fuses, grounds, and solenoids; everything checks out.
5. if the car is push started, its starts very well with even 50 rpm.
so if i barely jog with pushing i can pop it in 3rd, but with the starter cranking at 300 or watever rpm, it wont start.
basicly anytime i want to park, i need to find the highest point of the parking lot and park as close as i can to it so i can push start my car to leave. this is pretty frustrating as u can imagine. i literally push start it at least a couple times a day. i have to drive around looking for the best gas station that is designed to have a slight hill. lol
so we printed out every wiring diagram, and every flow chart, but the wiring diagrams help the most.
we found the the power ciruit relay controlled the turning on of the fuel pump when in the ON postion, and when i was in ON there was voltage present. one ground is at the PCM, and another goes to the diagnostic port. so we grounded it at the diagnostic port and hey the pump came on. why the PCM isn't doing it i dont know. we checked for spark, thats good. we checked for fuel, 42 psi checks out good when cranking (needs to be between 38-46). then we thought hey check the injectors. we checked the injectors. they all have a common power and are grounded individually by the PCM. in ON we have 12 volts source voltage. ok. but when we crank the motor, they drop to between 5 and 8 volts.
so basicly we figured when im cranking, the PCM isnt grounding the injectors to get the fuel in, but if i push start it then the PCM sees a signal from the distributor, then from the crank, then its like "ok we see a few inputs, lets turn on the fuel pump" and it starts, or something like that.
so right now i have it rigged so i can at least start it after several hours of being shutdown. i have a wire running from ground, to a switch, and to the ground of one of the injectors, so in a warm resart, i crank the motor, hit the switch for a second to dump fuel into at least one cylinder, and shut off the switch and it starts. the PCM sees that the engine wants to start so it decides to go ahead and ground the injectors when they need to be, this is just a way for me the get around without always having to park on top of the hill, or not park at all because there is no hill.
any suggestions guys? give it a try, u just might make my day
anything i missed? ill fill in more info as questions start being thrown at me.
Thanks,
jon
which i am gona leave to drive to in a minute.)