Ok guys I need some serious help here. Im over 2 years into a rebuild and for the past 2 months I’ve been troubleshooting with no success. I cannot get my motor to run or start at this point. I completed my rebuild about 4 months ago. At that time I was using an Safc2 and a Lex AFM(See my Mods list below). The motor ran fine on initial startup and I put about 30-40 miles on the engine. Everything seemed to be great.
At that point I decided to buy the maftpro and run speed density. So I sold my safc2 and lexus afm. Upon completion of installing the maftpro, the engine started up and idled well. I went ahead and let it warm up for about 5-10 minutes. So I hit the streets and 15 minutes into driving, I notice hesitation, even under partial throttle. So I decide to to pull onto a side street. At this point the motor is sputtering and barely staying alive..my w/b is showing the a/f’s get leaner and leaner, dies and I try to start it a few times. at this point doesnt even want to start, stumbles for a second and dies. I check the codes at that point and get None. I ended up having to get the car towed back to my house.
The following week I extensively go over my maftpro wiring to check everything is ok. I went over the wiring multiple times, and everything checked out. At that point Dr.J and Bob were very helpful in helping me troubleshoot to make sure everything was set correctly. I even went step by step with bob over the phone to confirm. At that point Wellington(Supralover2000) was very nice to loan me his maftpro unit to see if maybe my unit was bad, but that was unsuccesful. I and I thank him for further helping me troubleshoot, along with Mike, Brent, Justin727, johnny and whoever else I forgot.
Here is a list of reading I was getting from the maftpro during monitor mode.:
DC: 105.5
VE: 77.0
FO: 15
TPS: .51 closed and 3.50 fully open
MT: 48.7
o2: 5.01
FE: 100
ASC: 100
AFR: 20
CF: 100
TAF: 12.5
RPM: 0
MP: 99.8
UT: 0
BD: 0
HERE is the list of relevant mods:
- 550cc lucas injectors
- no j-tube, no fpr, no fpd,
- Aeromotive afpr
- Walbro 255, 12v mod
- maftpro w/speed density
- brand new o2 sensor
Well after testing spark on each cyl I found that I was not getting spark to every one. I put a new set of plugs gapped at .31 at that time to make sure they werent fouled. I found that after maybe 5+ cranks the engine would stumble to life for maybe 20 seconds run like crap. Fuel pressure is at 30 psi when the car was running so I know I am getting fuel. After pulling the plugs I noted that the ones that were not firing were soaked with fuel.
At this point I gather up a spare CPS, Ignitor, Coilpacks and ECU courtesy of JoeyDaze. I also throw in another set of new plugs . After trying to swap in each spare part I still had NO success. I also took off the ignitor fender mounting brack and scraped all the contact points to make sure the ignitor baseplate was getting a good ground. NOW HERE is something interesting. I decided to run a quick ground wire to the ignitor base. i go to start the car and it fires right up!! For about 45 seconds the engine ran amazingly, I was astonished. idle was great, no misfiring, f/p was good, then it suddenly began bogging down and died again. AFter trying to start it again, it WOULDNT, and was acting like it was before. I redid all my ground wires and battery cables, and adde extra grounds(which I mention below).
SO NOW I go ahead and buy a brand new engine wiring harness from champion toyota. I swapped in the new harness but still had NO success. The car is still behaving the same way.
This brings us up to this week. I went ahead and redid every ground wire and battery cables, and added a couple extra ground wires for safe measure. Put ANOTHER new set of plugs in.I also changed the IGN fuse in the drivers kickpanel at the advice of someone else. Still doesnt want to
start. it turns and turns but wont start. I found that im still not getting spark on all cylinders. I checked spark on #5 and 6 real quick and got ZERO spark. But once in a while it will get spark. and it seems the spark doesnt even start until after a few seconds of cranking. the first second or two of cranking produces no spark, but then it will start sparking.
Im definately getting fuel because the spark plug are wet with fuel whenever i pull them, and the plugs that fired are black. also the fpr is reading the proper pressure when when trying to start the motor. I know my maftpro wiring is correct. Im 100% positive, ive been over it so many times its not funny.
I even pulled out and recalibrated the cps AGAIN and its dead on, so is hard timing.
Everything lines up at TDC. but for some reason when im cranking the motor with a timing light on, the crank pulley notch is nowhere to be seen. at this point I am getting NO engine codes.
If you have any thoughts or insights please share. Its been 2 1/2 years since I been able to drive my supra(besides the 30 miles i put on it initialy after the rebuild). I appreciate the help guys. This has gotten to be very frustrating and I am out of ideas at this point. Thanks in advance.
- Steve
At that point I decided to buy the maftpro and run speed density. So I sold my safc2 and lexus afm. Upon completion of installing the maftpro, the engine started up and idled well. I went ahead and let it warm up for about 5-10 minutes. So I hit the streets and 15 minutes into driving, I notice hesitation, even under partial throttle. So I decide to to pull onto a side street. At this point the motor is sputtering and barely staying alive..my w/b is showing the a/f’s get leaner and leaner, dies and I try to start it a few times. at this point doesnt even want to start, stumbles for a second and dies. I check the codes at that point and get None. I ended up having to get the car towed back to my house.
The following week I extensively go over my maftpro wiring to check everything is ok. I went over the wiring multiple times, and everything checked out. At that point Dr.J and Bob were very helpful in helping me troubleshoot to make sure everything was set correctly. I even went step by step with bob over the phone to confirm. At that point Wellington(Supralover2000) was very nice to loan me his maftpro unit to see if maybe my unit was bad, but that was unsuccesful. I and I thank him for further helping me troubleshoot, along with Mike, Brent, Justin727, johnny and whoever else I forgot.
Here is a list of reading I was getting from the maftpro during monitor mode.:
DC: 105.5
VE: 77.0
FO: 15
TPS: .51 closed and 3.50 fully open
MT: 48.7
o2: 5.01
FE: 100
ASC: 100
AFR: 20
CF: 100
TAF: 12.5
RPM: 0
MP: 99.8
UT: 0
BD: 0
HERE is the list of relevant mods:
- 550cc lucas injectors
- no j-tube, no fpr, no fpd,
- Aeromotive afpr
- Walbro 255, 12v mod
- maftpro w/speed density
- brand new o2 sensor
Well after testing spark on each cyl I found that I was not getting spark to every one. I put a new set of plugs gapped at .31 at that time to make sure they werent fouled. I found that after maybe 5+ cranks the engine would stumble to life for maybe 20 seconds run like crap. Fuel pressure is at 30 psi when the car was running so I know I am getting fuel. After pulling the plugs I noted that the ones that were not firing were soaked with fuel.
At this point I gather up a spare CPS, Ignitor, Coilpacks and ECU courtesy of JoeyDaze. I also throw in another set of new plugs . After trying to swap in each spare part I still had NO success. I also took off the ignitor fender mounting brack and scraped all the contact points to make sure the ignitor baseplate was getting a good ground. NOW HERE is something interesting. I decided to run a quick ground wire to the ignitor base. i go to start the car and it fires right up!! For about 45 seconds the engine ran amazingly, I was astonished. idle was great, no misfiring, f/p was good, then it suddenly began bogging down and died again. AFter trying to start it again, it WOULDNT, and was acting like it was before. I redid all my ground wires and battery cables, and adde extra grounds(which I mention below).
SO NOW I go ahead and buy a brand new engine wiring harness from champion toyota. I swapped in the new harness but still had NO success. The car is still behaving the same way.
This brings us up to this week. I went ahead and redid every ground wire and battery cables, and added a couple extra ground wires for safe measure. Put ANOTHER new set of plugs in.I also changed the IGN fuse in the drivers kickpanel at the advice of someone else. Still doesnt want to
start. it turns and turns but wont start. I found that im still not getting spark on all cylinders. I checked spark on #5 and 6 real quick and got ZERO spark. But once in a while it will get spark. and it seems the spark doesnt even start until after a few seconds of cranking. the first second or two of cranking produces no spark, but then it will start sparking.
Im definately getting fuel because the spark plug are wet with fuel whenever i pull them, and the plugs that fired are black. also the fpr is reading the proper pressure when when trying to start the motor. I know my maftpro wiring is correct. Im 100% positive, ive been over it so many times its not funny.
I even pulled out and recalibrated the cps AGAIN and its dead on, so is hard timing.
Everything lines up at TDC. but for some reason when im cranking the motor with a timing light on, the crank pulley notch is nowhere to be seen. at this point I am getting NO engine codes.
If you have any thoughts or insights please share. Its been 2 1/2 years since I been able to drive my supra(besides the 30 miles i put on it initialy after the rebuild). I appreciate the help guys. This has gotten to be very frustrating and I am out of ideas at this point. Thanks in advance.
- Steve
