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Engine Management, Fuel, Spark, EGTs, and Air/Fuel Ratios This forum includes general electrical, modification, tuning, repair, replacement, identification and restoration of all components mentioned above including SMEC, SBEC, Logic Modules, aftermarket engine management, etc. Nitrous oxide posts go in here. This is the place

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Old 12-07-2012, 08:03 PM   #1
Exclamation Multiple codes Many Where to start?  
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1986 SC converted to intercooler and was running good. Until a few days ago, throws up many codes. Here they are. (PS) Battery was just disconnected for cable maintenance so codes are fresh! Here they are 22,23,24,26,27-31-44,45,46,47,51,52,53, 53, 54, 55! is the done one I know but where to start
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Old 12-08-2012, 05:30 AM   #2
Re: Multiple codes Many Where to start?  
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1)Is your main engine ground properly connected from the manifold to the firewall?
2)Does this car run or did these codes set cranking?
3)Are you still using 86 L Body electronics?
4)Is your 5 volt reference present at the ACT, CTS and TPS?
5)If the car runs what is charging voltage across the battery terminals?

I would start by checking all controller power feeds and grounds to the PM, PM to LM and at LM.
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Old 12-08-2012, 11:53 PM   #3
Re: Multiple codes Many Where to start?  
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1)Is your main engine ground properly connected from the manifold to the firewall? YES!
2)Does this car run or did these codes set cranking? Running.
3)Are you still using 86 L Body electronics? Modified per the instructions
5)If the car runs what is charging voltage across the battery terminals?14
Will get back to you on #4 Found wire off of battery to the control unit next to it. Said he did n't think it was important.
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Old 12-09-2012, 07:23 PM   #4
Re: Multiple codes Many Where to start?  
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Piece of Crap, only way to drop the idle is disconnect the tps cars sensors are good and idle gets higher when vacuume is disconnected! Any body got any ideas? TPS IS NEW and other sensors have been replaced with known good ones. 86 shelby charger converted to newer electronics and intercooler.
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Old 12-10-2012, 06:15 AM   #5
Re: Multiple codes Many Where to start?  
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You set fault codes for....
CTS, ACT, TPS, Injector Control Circuit, Purge Solenoid Circuit, Battery Temp, Overboost Shutdown, Battery Voltage High AND Low, Lean Exhaust Indication, Rich Exhaust Indication, Internal Memory Failure(normal on a calibrated controller)Fuel Sync Circuit.

You replaced ton's of parts but did no diagnostics, can't complain until diagnostics do not reveal the problem.

1)Have you checked ALL of your controller(PM and LM)power feeds and grounds?
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Old 12-10-2012, 08:13 AM   #6
Re: Multiple codes Many Where to start?  
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Yes ,Diagnosis was first! Frustration was second parts were third!
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Old 12-10-2012, 09:02 PM   #7
Re: Multiple codes Many Where to start?  
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Need to know where the wires on the battery terminals go, these were disassembled by my son when he thought he could remove ecm. There is a wire that was connected to the ecm that goes to which terminal?
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Old 12-11-2012, 06:15 AM   #8
Re: Multiple codes Many Where to start?  
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PM Sent
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Old 12-11-2012, 08:59 PM   #9
Re: Multiple codes Many Where to start?  
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Well , I did check voltage across every conection and found that the ground going to the body was bad. This explains why so many codes. No body ground, and the ground to the engine seemed ok! Thanks!
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