Maybe an MX3 guy has been in this situation.....
Posted: March 23rd, 2014, 11:08 am
I doubt it but here goes *breathing in
Ok so i have a challenge for you. I have a 1993 Mazda MX3 with a 2.5 KLZE swap. Three years ago i did a HEI and External coil mod on the car when it was a K8. When i did the 2.5 swap i just swapped over the modded disty and have been going strong for a year and a half (almost 2) I have recently got a OBD I VAF to the OBD II MAF conversion kit.
I have it all the KL47 MAF the OBD II millenia ECU the IAT and jumper harnesses. So today i took out my KL36 ecu and JE50 VAF to install the kit. I drilled a hole in my intake before the MAF for the IAT sensor and fit that in. I then found a 12v key on source in the fuse box and plugged it in. Then put the MAF in with my two 2.5 inch to 3 inch couplers brand new and plugged the MAF into the jumper harness then the jumper to the stock harness. Then i put the OBD II Ecu in and installed the jumper harness and plugged that harness into the stock harness. Still with me? Ok now I reconnected the battery and started the car up. It idled like garbage. So i shut it off and said "hey maybe i should reset the timing and TPS" seems smart right. Well when i jumped the ten and gnd i loosened up the TPS and jiggled it. I normally do the fan set technique to get it in the area then i use a multimeter. Well the fans never cut on.
I turned it all the way one way then all the way the next way and nothing. I then plugged everything new out and plugged in the old OBD I stuff and the fans came right on. So that rules out the fan broken. Then plugged all the OBD II stuff back in and the fan didnt work again. I hear a click somewhere (maybe the fan relay) but no fan operation. Ok so i say "well maybe because im not done" I double check everything is hooked up (OBD II stuff) and start the car so i can set the timing. The car cut off a few times but i moved the disty back and it stayed on. Then set the timing to 10° BTDC. The car ran rough but i thought that was normal in diag mode. I set the TPS with the multimeter and tightened it up.
I then shut the car off. Took out the jumper out ten and gnd and fired the car back up. The check engine light started flashing repeatedly. Also the car still idled like crap. I revved it a little and it cracked and pop and just smelled the gas so i know its running CRAZY rich OR the the coil isnt igniting and the flashing CEL is never a good sign. I know on the swap its supposed to stay lit because its a manual but flashing?!?! I know all the equipment is good because it came out of a running probe but the disty was unmodded. I know my motor is good because i was just driving around town yesterday with OBD I gear.
Ok so my questions are these;
Should i rewire my external coil to a newer diagram. Its currently wired to a 93.
Also whats with the fans. Has anyone else had this problem?
Whats with the flashing CEL. This means something serious right? like an engine damaged kind of thing.
Is the OBD II swap just not compatible with MX3´s kinda like some Xtremethings ECU´s are not???
Has anyone here done a OBD I to OBD II successfully with a external coil and HEI period???
Im thinking if not the coil and hei is just not compatible with OBDII stuff or i need to wire it to another year diagram. If someone has done the coil and hei than i can rule out those just not being compatible with OBDII stuff and rewiring it to another diagram. Any help would be appreciated. Sorry for the long story but a true KL guru would want all the details
Ok so i have a challenge for you. I have a 1993 Mazda MX3 with a 2.5 KLZE swap. Three years ago i did a HEI and External coil mod on the car when it was a K8. When i did the 2.5 swap i just swapped over the modded disty and have been going strong for a year and a half (almost 2) I have recently got a OBD I VAF to the OBD II MAF conversion kit.
I have it all the KL47 MAF the OBD II millenia ECU the IAT and jumper harnesses. So today i took out my KL36 ecu and JE50 VAF to install the kit. I drilled a hole in my intake before the MAF for the IAT sensor and fit that in. I then found a 12v key on source in the fuse box and plugged it in. Then put the MAF in with my two 2.5 inch to 3 inch couplers brand new and plugged the MAF into the jumper harness then the jumper to the stock harness. Then i put the OBD II Ecu in and installed the jumper harness and plugged that harness into the stock harness. Still with me? Ok now I reconnected the battery and started the car up. It idled like garbage. So i shut it off and said "hey maybe i should reset the timing and TPS" seems smart right. Well when i jumped the ten and gnd i loosened up the TPS and jiggled it. I normally do the fan set technique to get it in the area then i use a multimeter. Well the fans never cut on.
I turned it all the way one way then all the way the next way and nothing. I then plugged everything new out and plugged in the old OBD I stuff and the fans came right on. So that rules out the fan broken. Then plugged all the OBD II stuff back in and the fan didnt work again. I hear a click somewhere (maybe the fan relay) but no fan operation. Ok so i say "well maybe because im not done" I double check everything is hooked up (OBD II stuff) and start the car so i can set the timing. The car cut off a few times but i moved the disty back and it stayed on. Then set the timing to 10° BTDC. The car ran rough but i thought that was normal in diag mode. I set the TPS with the multimeter and tightened it up.
I then shut the car off. Took out the jumper out ten and gnd and fired the car back up. The check engine light started flashing repeatedly. Also the car still idled like crap. I revved it a little and it cracked and pop and just smelled the gas so i know its running CRAZY rich OR the the coil isnt igniting and the flashing CEL is never a good sign. I know on the swap its supposed to stay lit because its a manual but flashing?!?! I know all the equipment is good because it came out of a running probe but the disty was unmodded. I know my motor is good because i was just driving around town yesterday with OBD I gear.
Ok so my questions are these;
Should i rewire my external coil to a newer diagram. Its currently wired to a 93.
Also whats with the fans. Has anyone else had this problem?
Whats with the flashing CEL. This means something serious right? like an engine damaged kind of thing.
Is the OBD II swap just not compatible with MX3´s kinda like some Xtremethings ECU´s are not???
Has anyone here done a OBD I to OBD II successfully with a external coil and HEI period???
Im thinking if not the coil and hei is just not compatible with OBDII stuff or i need to wire it to another year diagram. If someone has done the coil and hei than i can rule out those just not being compatible with OBDII stuff and rewiring it to another diagram. Any help would be appreciated. Sorry for the long story but a true KL guru would want all the details