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Discussion Starter · #1 ·
I’m having a bit of a problem and I’m wondering if it is Trans+ related.
Yesterday while I was merging onto the hwy, the car backfired and threw a code 42. I pulled over and found that the up pipe had been blown off. I tightened it back down and cleared the ECM but within a few seconds the code came back again.
Today I went through the usual checks and found no shorts or broken wires from the Ignition module to ECM, and went over all the Trans+ connections.
Just before I began all the Tan and white wire voltage tests, I decided to disconnected the EST signal to the Trans and put in the pigtail… The code went away, plug it back into the Trans and it throws the code.
Anybody ever have a similar experience? Is it possible that something has gone wrong with the unit? dunno
I am running jumpered right now and in open loop idle, but almost all the BLM cells run down around 100. ugh
Also, could the backfire have killed the MAF, (LT1 mounted in the up pipe) and is there any way I can check it with a DVM?

Paul :(
1972 Toyota Celica with an 87 GN Engine.
Motor 30 over, 10/10 crank, high vol.oil pump, SpeedPro 194/204 Cam, Comp Cam 980 valve springs
PTE 44 turbo, 0.65 Ex housing, Dutweiller Big neck intercooler, Jay Jackson's 62 mm Throttle body, ported and polished plenum with upper part of EGR tower removed, Power Plate, solid MAF pipe, K&N Filter.
Postons drivers and passenger side headers and 2 pce crossover pipe. Hand made TH style DP, 3" exhaust split to 2 ½ " dual Magnaflows.
52 # Siemens low imp. injectors, Red A's modded ECM, Translator Plus, LT1 MAF (Mounted in the up-pipe) Extender chip, Boost Commander, dual wastegate solenoids, Adj. Fuel Reg, Hot wired Walbro GSS 340 intank fuel pump, Poly Mount.
ATR billet OD H20 pump pulley, 2 x 10" Flexalite electric fans, RMI 25.
Type II coil pack and module, 8.5 Magnecor's, AC CR42's.
DirectScan, Caspers Knock gauge, Autometer 30/30 boost/vacuum gauge, Autometer tranny temp gauge.
200 4R tranny, B&M 28,000GVW SuperCooler, remote filter, stock D5 converter, B&M Megashifter, Chopped Ford 9" @3:25 Trac Lok rear with a 300 ZX disk brake setup. Air bags, 85 Supra 57 mm piston 10" vented rotor front brake setup, Nissan 300 ZX 15/16 master cylinder, Dunlop SP 5000 205/50ZR 15's, Hurst Roll control, Ford power steering rack, Bilstein Rally shocks rear, Tokico race struts front, heavy duty coils.
 

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Paul
Mine did the same thing last year.I redid all the connectors and soilder the wires back.Cleaned the Direct scan plug and did not push the plug all the way in to the ecm.So far no code 42.Drove me nuts at the track last year,stumble miss at mid track and back fire.Nothing yet this year after I did all this and talk to Bob and Chu engineering.
Let me know what happens.
Mike
 

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Discussion Starter · #3 ·
Thanks Mike,
I'm pretty sure it is the unit. I checked it against Tim's unit and the car runs fine. I'm taking it down to Bob's tomorrow so he can have a look at it.

Paul
 
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