TPI Swap Fan relay question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rderochiegreen · 12-30-2011, 09:10 PM

I am just wrapping up my TPI swap onto my 327, we had it running earlier today, but noticed an oil leak from somewhere ugly up in the back of the block area. I will post some pictures relatively soon, and a parts list to help out those who are interested in doing the same swap. That wasn't the only issue though. I bought an aftermarket harness from fuelinjectionconnection.com out of Colorado and wired up the dark green with white stripe output wire for the fan to a bosch relay as a person normally would. Dark Green- 86 Trigger,Output Power to fan- 87 ,Ground- 85, Power from Battery 30. However my fan doesn't turn on when I am higher than the temps my guy programmed into my ecm. I know my fan works and that I have power to the relay. Any ideas ? Would having the ground for the relay and the ground for the fan on the same bolt affect this ? I had a datalogging system hooked up to this on my laptop and it claims the ECM is sending the signal to turn the fans on as well.
Thanks.
Ryan

Chevy1TonFun · 12-30-2011, 09:50 PM

Was the leak right behind the intake? If so there is a oil gallery access hole there.
A ground is a ground, thats not the issue. I would double check your wiring and make sure everything is getting voltage it needs.

Street Smart · 12-30-2011, 09:59 PM

If the ecm sends a ground to turn the relay on, then #85 needs to go to ign pos+

Street Smart · 12-30-2011, 10:08 PM

Let me know the year computer your using and i can double check, but I`m pretty sure it sends a ground to turn on the fan relay.

rderochiegreen · 12-31-2011, 04:05 AM

It is a Speed Density 90-92 F-body setup with a 1227730 ECM originally out of a Beretta. My guy made the V8 PROM. I think I understand exactly what you are saying, essentially the opposite of how I have it set up with the ground and battery power now. Unfortunately I am out of town for about awhile but I will switch things up and report how it turns out. Thanks a lot for the tip.

12-30-2011, 09:10 PM	#1
rderochiegreen Registered User Join Date: Dec 2011 Location: calgary ab Posts: 2	TPI Swap Fan relay question I am just wrapping up my TPI swap onto my 327, we had it running earlier today, but noticed an oil leak from somewhere ugly up in the back of the block area. I will post some pictures relatively soon, and a parts list to help out those who are interested in doing the same swap. That wasn't the only issue though. I bought an aftermarket harness from fuelinjectionconnection.com out of Colorado and wired up the dark green with white stripe output wire for the fan to a bosch relay as a person normally would. Dark Green- 86 Trigger,Output Power to fan- 87 ,Ground- 85, Power from Battery 30. However my fan doesn't turn on when I am higher than the temps my guy programmed into my ecm. I know my fan works and that I have power to the relay. Any ideas ? Would having the ground for the relay and the ground for the fan on the same bolt affect this ? I had a datalogging system hooked up to this on my laptop and it claims the ECM is sending the signal to turn the fans on as well. Thanks. Ryan __________________ 1968 CST C10 327w/TPI TH400

12-30-2011, 09:50 PM	#2
Chevy1TonFun Grease Monkey Join Date: Oct 2007 Location: Fresno CA Posts: 750	Re: TPI Swap Fan relay question Was the leak right behind the intake? If so there is a oil gallery access hole there. A ground is a ground, thats not the issue. I would double check your wiring and make sure everything is getting voltage it needs. __________________ Tow Rig: 2012 Chevy 2500HD CCSB LTZ Z71 4x4 Duramax Ultimate Offroad Build: 1978 Chevy Silverado K30 Crewcab Build Link http://67-72chevytrucks.com/vboard/s...d.php?t=654053 Mud Truck: 1972 Chevy Cheyenne K30 4x4, 468/400/205, D60/D70HD, 18" Custom Lift, 17x39" IROKs FOR SALE http://67-72chevytrucks.com/vboard/c...ton-4x4&cat=12

12-30-2011, 09:59 PM	#3
Street Smart Registered User Join Date: Dec 2009 Location: Brooklyn N.Y. Posts: 819	Re: TPI Swap Fan relay question If the ecm sends a ground to turn the relay on, then #85 needs to go to ign pos+ __________________ 1967 GMC Suburban, Supercharged 6.2 LS with a 6l80e , my 11 second tow vehicle! pic in my profile 1987 GMC CrewCab Dually 6.0 LS/6L90e, new tow pig. http://67-72chevytrucks.com/gallery/...=74049&cat=500

12-30-2011, 10:08 PM	#4
Street Smart Registered User Join Date: Dec 2009 Location: Brooklyn N.Y. Posts: 819	Re: TPI Swap Fan relay question Let me know the year computer your using and i can double check, but I`m pretty sure it sends a ground to turn on the fan relay. __________________ 1967 GMC Suburban, Supercharged 6.2 LS with a 6l80e , my 11 second tow vehicle! pic in my profile 1987 GMC CrewCab Dually 6.0 LS/6L90e, new tow pig. http://67-72chevytrucks.com/gallery/...=74049&cat=500

12-31-2011, 04:05 AM	#5
rderochiegreen Registered User Join Date: Dec 2011 Location: calgary ab Posts: 2	Re: TPI Swap Fan relay question It is a Speed Density 90-92 F-body setup with a 1227730 ECM originally out of a Beretta. My guy made the V8 PROM. I think I understand exactly what you are saying, essentially the opposite of how I have it set up with the ground and battery power now. Unfortunately I am out of town for about awhile but I will switch things up and report how it turns out. Thanks a lot for the tip. __________________ 1968 CST C10 327w/TPI TH400



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