How long for ECU to relearn?
03-13-2009, 01:56 AM
#1
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
How long for ECU to relearn?
How long does it take the ECU after being reset to re-learn whatever it has?
I pulled the ecu on my 350TPI to check it was working fine, and at the same time changed the SES bulb, plugged it all back in and got code 12 when running shorted diagnostic pins.
Turned the car off, removed wire and started it and left it for 5 mins, and turned it off. That was yesterday, and then today I went for a drive down the road, only about a mile or two, and the throttle repsonse sucked ***. The car drove like a had a caravan in tow.
Is this because the ECU needs to take more readings etc? or is the problem elsewhere?
I pulled the ecu on my 350TPI to check it was working fine, and at the same time changed the SES bulb, plugged it all back in and got code 12 when running shorted diagnostic pins.
Turned the car off, removed wire and started it and left it for 5 mins, and turned it off. That was yesterday, and then today I went for a drive down the road, only about a mile or two, and the throttle repsonse sucked ***. The car drove like a had a caravan in tow.
Is this because the ECU needs to take more readings etc? or is the problem elsewhere?
03-13-2009, 04:33 AM
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Car: 89 iroc
Engine: l98
Transmission: tremec
Re: How long for ECU to relearn?
How long does it take the ECU after being reset to re-learn whatever it has?
I pulled the ecu on my 350TPI to check it was working fine, and at the same time changed the SES bulb, plugged it all back in and got code 12 when running shorted diagnostic pins.
Turned the car off, removed wire and started it and left it for 5 mins, and turned it off. That was yesterday, and then today I went for a drive down the road, only about a mile or two, and the throttle repsonse sucked ***. The car drove like a had a caravan in tow.
Is this because the ECU needs to take more readings etc? or is the problem elsewhere?
I pulled the ecu on my 350TPI to check it was working fine, and at the same time changed the SES bulb, plugged it all back in and got code 12 when running shorted diagnostic pins.
Turned the car off, removed wire and started it and left it for 5 mins, and turned it off. That was yesterday, and then today I went for a drive down the road, only about a mile or two, and the throttle repsonse sucked ***. The car drove like a had a caravan in tow.
Is this because the ECU needs to take more readings etc? or is the problem elsewhere?
03-13-2009, 04:38 AM
#3
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Re: How long for ECU to relearn?
sorry bout that.
1985 Pontiac TransAM, with 290hp 350 crate motor, 87TPI setup, 16198259(re-man 165) ECU, 19lbs injectors, MEMCAL chip, extractors into 2 cats into a 3" exhaust system, stage 2 shift kit.
Pretty sure everything plugged ok, it was just running sluggish.
1985 Pontiac TransAM, with 290hp 350 crate motor, 87TPI setup, 16198259(re-man 165) ECU, 19lbs injectors, MEMCAL chip, extractors into 2 cats into a 3" exhaust system, stage 2 shift kit.
Pretty sure everything plugged ok, it was just running sluggish.
03-13-2009, 04:39 AM
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Re: How long for ECU to relearn?
also if one of the pins didnt go through, wouldnt it come up as a code in the diagnostics?
03-13-2009, 05:24 AM
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Car: 89 iroc
Engine: l98
Transmission: tremec
03-15-2009, 04:25 PM
#6
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Re: How long for ECU to relearn?
Nah it was running rough at idle, but it had a lot more power than there is now.
It was still nowhere near where it should've been for a 290hp motor but now it feels like I've got a caravan in tow.
It was still nowhere near where it should've been for a 290hp motor but now it feels like I've got a caravan in tow.
03-15-2009, 07:32 PM
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Car: 89 iroc
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03-15-2009, 07:52 PM
#8
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
Re: How long for ECU to relearn?
It honestly sounds like you are running a 305 chip with the 19# 305 injectors. If that is the case, your ECM is adding fuel and stores the fuel trims it last used. Driving it a good 30-50 miles will let it adapt and bring you back your power.
03-15-2009, 09:11 PM
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Car: 1985 Pontiac TransAM
Engine: 400SBC 24x conversion
Transmission: T700r Stage2 Shiftkitted
Axle/Gears: 2.77 9 Bolt
Re: How long for ECU to relearn?
Thanks mate. I've got it booked in for a dyno tune thursday so they should be able to get it running good I'm hoping, or at least tell me whats wrong with it.
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