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What did you do to your car today?
It's sounds like it could be running a bit lean at idle, maybe pull a spark plug at see how it looks for chitz and giggles. The car and engine look great.
351w - Ford racing GT40X 178 cc aluminum heads - Ford racing(crane) 1.7 roller rockers - Comp Cams 280H magnum cam .544" / .544" lift - ARP fasteners - hedman longtubes - magnaflow exhaust with X pipe -  MSD digital 6al box - MSD coil - optima red top battery - tuff stuff 140 amp alternator - ported weiand stealth intake  - edelbrock 1406 600 carb  - edelbrock rpm fuel pump - march pullies and brackets - Be cool fan controller - derale electric fan - FMX trans - motive 3.50 gears - traction lok - competition engineering subframe connectors - lakewood traction bars.                                            

1987 mustang LX - 5.0 - GT40P heads - Crane 1.7 roller rockers - RPM intake - 750 carb - flowtech longtubes  -  X pipe - MAC flow paths - 3.73's - t-lok - AOD trans - transgo shift kit - Be cool fan controller - derale electric fan.


(07-17-2017, 01:38 PM)tony-muscle Wrote:
(07-17-2017, 01:17 PM)Don C Wrote: I agree with John, the CDI box shouldn't effect the temperatures. If filling the radiator doesn't solve it I would check timing and air/fuel ratios. How about your fan? Does it have a clutch?

My fan has a clutch and it was turning. Are these fan clutches dual speed? Chin

AF ratio is controlled by the EFI and timing was right at 10 deg as it has been for a while. Since the engine has run well for a long time until just now, I am confident it was a lack of coolant Shootself . I will have to check the coolant level often until I figure out if there is a leak.

The fans are kind of variable speed. As the clutch gets hotter it locks up more. When the temperature of the air coming through the radiator gets to the 190° - 200° range the clutch sould be pretty much locked up and turning at the pulley speed. So, when it is hot (and the engine shut off) you shouldn't be able to easily turn it by hand. When cool it should be easy to turn the fan by hand. Some clutches are also speed dependant and when the pulley reaches a certain RPM the clutch locks up.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
-Adjusted kick down rod on FMX now downshifts properly
- replaced hood springs! It stays up now!


1971 Mustang Mach 1 H Code
2015 Mustang GT anniversary edition
2014 F150
1965 Mustang Fastback K Code GT
From the Dark Side:
1976 Pontiac Trans Am

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