ecu troubles?

steve0490 · 05-26-2011, 01:10 PM

the engine harness burned from a short so i replaced the whole harness car ran great as soon as i put it in gear it ran like shit again i got a code for tps, changed the tps car still ran like shit then itshowed code 11 then code 10 now the car wont run

El Supracabras · 05-26-2011, 01:47 PM

You know that little bunched up set of grounds that goes under the intake manifold right by the brake booster? Check those again. Make sure they're perfect. It would be best to check the continuity of the ecu ground if you can too. If the car wont run, somethings missing. Do the basic checks (spark, fuel,etc). Was the harness an exact replacement?

steve0490 · 05-26-2011, 04:15 PM

I used a dirrect fit harness gas is good grounds are good i havnt checked spark yet but ive tried twp different coilds and tow different distributors

El Supracabras · 05-26-2011, 05:16 PM

You must have a lot of extra parts laying around. Me too.
Test for spark first. Check if injectors have power. Check if they pulse. Check timing again. If the wiring is good, something has to be bad. It could very well be the ecu but the only way to be sure is test everything. If everything checks out, there is no question about the ecu.

steve0490 · 05-26-2011, 06:40 PM

I really think it is because the car ran mint right after i dropped the harness in its when i ptu it in gear and tried to drive it that it started running like shit again, i heard somewhere that a bad alternator could do that is this true or a myth

El Supracabras · 05-26-2011, 06:52 PM

Though I've never experienced it, I've heard of faulty alternators causing weird problems. A short that big MIGHT have fried the rectifier bridge or the regulator. Since the car doesn't run, to check it, you can remove the alternator and bring it to Autozone or someplace similar. Most have a machine to bench test alternators. If it checks out, that is one less thing it could be. Also be sure battery voltage is what it should be, you can bring it in with you to be load tested.

steve0490 · 05-26-2011, 10:11 PM

Thats a good idea i ddint think of that specially since these problems occured after i changed the battery i coulda bought a faulty battery

steve0490 · 05-26-2011, 06:55 PM

Good idea i didnt even think of that most these problems started after i changed the battery maybe i got a faulty battery

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05-26-2011, 01:10 PM	#1
steve0490 Stock Join Date: Jun 2010 Location: mahopac Posts: 24	the engine harness burned from a short so i replaced the whole harness car ran great as soon as i put it in gear it ran like shit again i got a code for tps, changed the tps car still ran like shit then itshowed code 11 then code 10 now the car wont run

05-26-2011, 01:47 PM	#2
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	You know that little bunched up set of grounds that goes under the intake manifold right by the brake booster? Check those again. Make sure they're perfect. It would be best to check the continuity of the ecu ground if you can too. If the car wont run, somethings missing. Do the basic checks (spark, fuel,etc). Was the harness an exact replacement?

05-26-2011, 04:15 PM	#3
steve0490 Stock Join Date: Jun 2010 Location: mahopac Posts: 24	I used a dirrect fit harness gas is good grounds are good i havnt checked spark yet but ive tried twp different coilds and tow different distributors

05-26-2011, 05:16 PM	#4
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	You must have a lot of extra parts laying around. Me too. Test for spark first. Check if injectors have power. Check if they pulse. Check timing again. If the wiring is good, something has to be bad. It could very well be the ecu but the only way to be sure is test everything. If everything checks out, there is no question about the ecu.

05-26-2011, 06:40 PM	#5
steve0490 Stock Join Date: Jun 2010 Location: mahopac Posts: 24	I really think it is because the car ran mint right after i dropped the harness in its when i ptu it in gear and tried to drive it that it started running like shit again, i heard somewhere that a bad alternator could do that is this true or a myth

05-26-2011, 06:52 PM	#6
El Supracabras 3" Exhaust Join Date: Feb 2010 Location: Chicago Posts: 240	Though I've never experienced it, I've heard of faulty alternators causing weird problems. A short that big MIGHT have fried the rectifier bridge or the regulator. Since the car doesn't run, to check it, you can remove the alternator and bring it to Autozone or someplace similar. Most have a machine to bench test alternators. If it checks out, that is one less thing it could be. Also be sure battery voltage is what it should be, you can bring it in with you to be load tested.

05-26-2011, 10:11 PM	#7
steve0490 Stock Join Date: Jun 2010 Location: mahopac Posts: 24	Thats a good idea i ddint think of that specially since these problems occured after i changed the battery i coulda bought a faulty battery

05-26-2011, 06:55 PM	#8
steve0490 Stock Join Date: Jun 2010 Location: mahopac Posts: 24	Good idea i didnt even think of that most these problems started after i changed the battery maybe i got a faulty battery