Need help 7mgte cutting spark

[Jonasguy]

So, I'm about to give up on this supra because I've tried everything and it still cuts spark at 2500rpm.
Details- New TPS
New CPS
3 New Coil packs
New ECU
2 New Knock sensors
New HAC
New Harness
New spark plugs and wires
New AFM
New Turbo
New Head with 264 cams
New metal head gasket
Block has 10k since rebuild
Timing has been checked 20+ times
Vacuum lines have been checked about 10 times
All new fuses and relays
Two step was also removed and so was Safc 2
I Have a ton of money in new parts in this car and it still isn't running right and no one has an answer.


Problem- Car idles fine 18mmhg vac. car revs up to 2500rpm then starts cutting spark and it starts to get really rich and spit flames, after about 4000rpm the spark is fine and car runs normal. how do I fix the cut at 2500rpm?

 

[plaaya69]

I would give you the advice to even test your new parts. Just because a part is new, it does not always work right out of the box. I ordered a remain A1 Cardone CPS and it was no good. Same with their rack & pinion.

What spark plugs and gap are you running?
What type of fuel injectors are you running?

 

[Jonasguy]

I checked The TPS, CPS and Coil Packs per the TSRM already I can check the others too
I'm Running Autolight 3055 double plat spark plugs with a .028 gap
Fuel injectors are RC 550

I forgot to add I put new fuel in it and new battery

 

[f00g00]

What AFR are you hitting when it cuts?
What ECU are you running?
Are the 550's being run with a Lexus AFM?
Are you getting any codes?
Have you tried stock injectors and stock boost?

 

[Piratetip]

How hacked up is the ECU wiring after removing the two step and SAFC?

What was done to the ECU wiring with the piggybacks?

Have you returned the wiring back to factory?
What methods were used to repair the wiring?
Crimps, connectors, solder? ect....

 

[Jonasguy]

AFR hits 10.2 when it cuts spark
I don't know what ecu other than its got blue writing, it's for 7mgte and M/T
Yes 550s are used with Lexus AFM
No codes show up at all even when it cuts spark
I've tried stock boost but not stock injectors
I melted the plastic wrap on most of the wires to install the SAFC then soldered them in. I cut the 2 wires SAFC says needs to be cut and soldered those wires in.
The wiring after removing SAFC and 2step is fine because I brought the harness back to normal/Factory condition except for the EV1 injector clips
I used solder to repair the harness because that's the best way I know

 

[hvyman]

Sounds like boost leak.

Perform boost leak test.

If reset the code 34 can sometimes not show up right away and would require lengthy time miss firing in order for it to pop up.

 

[Jonasguy]

Would a boost leak really cause it to cut spark at an rpm range though.
The only leak is from the coupler to the turbo compressor and it keeps blowing the coupler off when I hit boost