running rough( more at idle)
02-02-13, 05:57 PM
#27
i second the motion for a PFC, too many things omitted for it to run correctly now on the stock ECU. it sounds like it is dumping about 50% too much fuel at idle which can be due to a number of issues. the PFC will give you troubleshooting as well as control over everything.
normally with this issue i find that the coolant thermosensor is either unplugged or swapped with the fuel thermosensor on the fuel rail. a map sensor issue will also give similar symptoms. the PFC will give you the data that the ECU is seeing.
normally with this issue i find that the coolant thermosensor is either unplugged or swapped with the fuel thermosensor on the fuel rail. a map sensor issue will also give similar symptoms. the PFC will give you the data that the ECU is seeing.
02-02-13, 06:20 PM
#28
thats the funny thing the tps wasnt throwing a code....but yet it was bad. i just made some 330ohm 1/2 watt resistors to put in place of the solenoids on the rat nest to clear those codes. after i install those i will se what if any codes return which im sure the omp code will (therefore causing the limp to kick in). just need to spend some more diag time hard to do while fighting a cold and its in the 20's at night!
02-02-13, 10:20 PM
#29
So codes are 23,28,30,38,39,40.....I currently found a loose ground and put all resistors I made it and it doesn't reallyseem to help. I did notice upon the very first start it runs perfect not missing a lick for about 20secs and then it starts.. please help as I'm running out of ideas
02-03-13, 09:08 AM
#30
23 is the main one causing your issue (if you read the codes correctly). You likely have an issue with your wiring harness. If you put resistors in and the codes are still showing, then you have a ground wire issue. Likely, the wiring harness is old and crusty which means there is probably some continuity issues as most of the solenoids will share a common ground.
If you intend on keeping this car for a while, just fork out the money for a new emissions harness and enjoy.
If you intend on keeping this car for a while, just fork out the money for a new emissions harness and enjoy.
02-05-13, 06:58 AM
#37
not that im disagreeing with you but wouldnt that in a way be better?? i mean im pretty good with wiring but def not expert. i redid my whole 88 10thae harness and it ran alot better and looked better. not that i am going for the "looks" right now but if im going to redo the harness i might as well make it look good ya know? basically what im saying if if i can make this harness ok and delete all the emmision connectors execpt for the fuel pressure one wouldnt that be better and "look" better on the eye and wallet in the long run? im planning on trying this out and if it doesnt work just get another harness and probably the rywire.
02-05-13, 09:33 AM
#38
I'm suggesting to get the car running properly first before trying to make it "look better". If you do the latter right now, you won't know if your issues are because of your "beautification" work or your un-diagnosed current problem.
At the end of the day, it's your car. Do as you like. You asked for advice and you got it. It's up to you what you do with it.
At the end of the day, it's your car. Do as you like. You asked for advice and you got it. It's up to you what you do with it.
02-05-13, 10:06 AM
#39
I'm suggesting to get the car running properly first before trying to make it "look better". If you do the latter right now, you won't know if your issues are because of your "beautification" work or your un-diagnosed current problem.
At the end of the day, it's your car. Do as you like. You asked for advice and you got it. It's up to you what you do with it.
At the end of the day, it's your car. Do as you like. You asked for advice and you got it. It's up to you what you do with it.
02-08-13, 10:13 AM
#40
ok so still in the process of repairing the harness first. i do have a couple of questions as this is a jdm harness. 1st- it doesnt appear that there is a connector or wire that goes to the coolant temp sensor on the drivers side of the block. anyone know what color wire this should be? 2nd- does anyone have wiring schaematics for jdm harness? as far as colors? thanks!
02-12-13, 06:18 AM
#41
ok so im thinking that the ecu may have gotten fried from the wiring grounding out. where i stand now is the injectors are not getting any ground. all have power from the bl/y wires but no ground signals which are supplied from the ecu itself. i have verified that the wires have no open or shorts in them .3 ohms of resistance. the ecu itself has all grounds and power as there is spark but just not sending signal to to the injectors??? any other thoughts???
02-19-13, 07:26 PM
#45
sigh....so now more problems.....finally replaced the harness and i did get the car to start last night( sprayed a lil starter fluid in it and it fired up and kept running) went to work on it more tonight and could not get it to start at all!! i can get it to sputter on starter fluid but wont run. i verified spark and pulled the fuel rail up to verify that the injectors are spraying. what the hell else could it be??? as im sitting here thinking could it possible be the plugs??? i have had those in there while chasing all these issues.
02-21-13, 06:24 AM
#47
replaced plugs and that didnt seem to help, think i narrowed it down to a cold start issue. once i get it fire up and warm it starts with no problem at all. so tonight im going to check my connectors to the coolant temp sensor and air intake temp sensor. ill post up results
02-21-13, 01:22 PM
#48
94 fd will not start cold
ok so i figured is start a new thread since my old thread is getting no input. The problem i am having is the car will not spit,sputter...nothing on a cold start. i have to spray a little brake cleaner in the intake and it will spit and start. it runs fine with no problems when running. the car starts fine on a warm or hot start with not problem at all.
- i have verified fuel ( pulled the fuel rail up and watched the injectors spray as i turned the ignition)
- i have verified spark by testing each wire with a spark plug tester ( both leading and trailing)
- i have verified compression by not being the best but 95psi on each face
tonight i plan on checking the fuel pressure and my connectors to be sure i have the coolant temp and air temps plugged up correct
little background i got the car and it was a wiring nightmare!! replaced the engine harness and fixed alot of mistakes. i have the rats nest removed and 330ohm resistors in the plugs.
can someone please help me out with this
- i have verified fuel ( pulled the fuel rail up and watched the injectors spray as i turned the ignition)
- i have verified spark by testing each wire with a spark plug tester ( both leading and trailing)
- i have verified compression by not being the best but 95psi on each face
tonight i plan on checking the fuel pressure and my connectors to be sure i have the coolant temp and air temps plugged up correct
little background i got the car and it was a wiring nightmare!! replaced the engine harness and fixed alot of mistakes. i have the rats nest removed and 330ohm resistors in the plugs.
can someone please help me out with this
