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85 T/A WS6 Member
Joined: 18 Feb 2004 Posts: 539 Location: Buckley
1985 Pontiac Trans Am
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Posted: Sun Jun 10, 2012 7:32 pm Post subject: Aggressive Fan |
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Wants to go go go before decent op temp. Any ideas?
Makes the car run colder than needed _________________
1985 Trans Am Recaro Option (AS5)
67,000 miles 5.0 TPI Hi Flow MAF
TPI Airfoil w/Bypass Flowmaster WS6 (.92g)
3:27 Borg Warner Posi K&N Filtration |
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Al Hasse Member
Joined: 19 Nov 2005 Posts: 4379 Location: Bremerton, WA
1992 Chevrolet Camaro RS
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Posted: Sun Jun 10, 2012 7:52 pm Post subject: |
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Switch in the head going bad? Mine was on almost constantly before I replaced the switch. _________________ 92 Camaro
89 Camaro
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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Sun Jun 10, 2012 8:04 pm Post subject: |
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LB9 was ECM controlled as I remember. So I would guess bad coolant temp sensor.
If you can datalog (or know someone who can) you would be able to confirm this before purchasing parts. |
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chevymad Master B
Joined: 11 Jan 2004 Posts: 5474
1987 Pontiac Formula
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Posted: Sun Jun 10, 2012 8:41 pm Post subject: |
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Dont have the AC or defrost on?
Also car shouldnt run below thermostat temp, even if the fan never shuts off. |
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DBL_TKE Member
Joined: 28 Feb 2007 Posts: 1505 Location: Aloha, OR
1991 Chevrolet Camaro Z/28
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Posted: Mon Jun 11, 2012 4:59 am Post subject: |
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aaron_sK wrote: | LB9 was ECM controlled as I remember. So I would guess bad coolant temp sensor.
If you can datalog (or know someone who can) you would be able to confirm this before purchasing parts. |
Idk, about the single fan setup but the dual fan set up on LB9's have a temp switch in the head for fan #1, and cooling fan #2 is ECM controlled and activated by the A/C switch.
Oh, and here's the stock temperature perameters in case anyone was curious.
Cooling fan #1 enabled at 107̊C (226̊F)
Cooling fan #1 off at 104.7̊C (220.5̊F)
Cooling fan #2 enabled at 115.2̊C (239.5̊F)
Cooling fan #2 off at 110̊C (230̊F)
Cooling fan duty cycle at 100% at 80̊C (176̊F) _________________ Richmond 3.73 posi| 36/24 sway bars | SLP LM2 | Koni's | Ground Control 800/200 | Y2K wheels | Dyno Don headers & Y-pipe | airfoil | BBK underdrive pulleys | Raised strut mounts | Extended ball joints | LCARB'S
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Twilightoptics Hardcore (12sec Club)
Joined: 13 Jan 2004 Posts: 9191 Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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Posted: Mon Jun 11, 2012 8:11 am Post subject: |
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85 TPI single fan ecm controlled. _________________ A redline a day keeps the carbon away! |
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85 T/A WS6 Member
Joined: 18 Feb 2004 Posts: 539 Location: Buckley
1985 Pontiac Trans Am
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Posted: Mon Jun 11, 2012 2:31 pm Post subject: |
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AC off. Unplugged battery to try to reset, maybe I didnt leave it dead long enough...what is proper time to kill ECM memory?
I have a 170 T-Stat if I recall....
Put the second new fuel pump in, seems to work so far, was a fun weekend |
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aaron_sK Member
Joined: 23 Jan 2006 Posts: 8834 Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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Posted: Mon Jun 11, 2012 3:15 pm Post subject: |
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AFAIK there is nothing that the ECM learns that affects the fan. |
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Twilightoptics Hardcore (12sec Club)
Joined: 13 Jan 2004 Posts: 9191 Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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Posted: Mon Jun 11, 2012 4:12 pm Post subject: |
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Strictly an on/off parameter threshold. _________________ A redline a day keeps the carbon away! |
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85 T/A WS6 Member
Joined: 18 Feb 2004 Posts: 539 Location: Buckley
1985 Pontiac Trans Am
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Posted: Tue Jun 12, 2012 6:28 am Post subject: |
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I have a new Hypertech switch, maybe Ill put that in, no access to data logger.
If my ECM is going out, and I replaced 2 fuel pumps as a result, I'm going to the moon. |
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Twilightoptics Hardcore (12sec Club)
Joined: 13 Jan 2004 Posts: 9191 Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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Posted: Tue Jun 12, 2012 8:07 am Post subject: |
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Ecm triggers a relay for the pump, not the pump itself. _________________ A redline a day keeps the carbon away! |
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