twilsonbpa

Any help would be appreciated!!......

Since installing my PFC anytime the car hits 105 deg C it revs up to 3000 and then starts bouncinging betweeen 1000 and 2000...only if i hit 105.

I first noticed it when i would shut the car off hot, then upon restarting it would do this bounce...i realized it was only when the pfc read over 105c...due to heat soaking. i shut off hte car, restart it the pfc readjusts and it idles fine.

I noticed on a hot day when i entered the freeway the temp went up...as soon as it hit 105c i could feel the throttle change..it was doing the same thing till the car cooled driving to below 105...

thx in avance for any help...driving me nuts

woundup7

iTrader: (1)

Wow, I dont think 105 C is good at all. I have my fan set at 85 C and my butt starts to pucker at anything over 95 C. I know that didn't answer your question, but the heat can't be helping any.

DK

iTrader: (5)

Geez 105 ... you really need to fix that. I've never seen anything north of 89.

cewrx7r1

iTrader: (2)

First fix the overheating problem, then search about the bouncing throttle.
It is in top 5 questions for car/PFC unexperiened newbs.
Find yourself a local mentor and pay to learn if necessary.

I have done some OJT for some customers by charging less but having them do half the work with me guiding them.

Before the PFC, all we could adjust was idle air flow to correct the bounce. Now you can also adjust fuel.

BDC

105*C is way overheating!!! Need to get that thing fixed prior to doing anything else!!!

B

jmadams74

Have you replaced the thermoswitch with the 97 degree FC replacement switch (see Dale Clark writeup)? My car would occasionally go over 100, but since replacing the switch, it doesn't. (I guess some of the fan mods will do the same thing, but I didn't want to have to use a manual override)

mdpalmer

iTrader: (24)

This is kind of off topic...

But, for a stock cooling system, on a 90+ deg day stuck in traffic, it's not that abnormal I'd imagine. Also depends on what ratio of coolant/water you're running and whether or not you have other substances in the fluid (water wetter).

What do you make of this, then: posted in "the big fat FD3S cooling thread"

--------------------------------------------
7. Optimum Temps
65C (150F): too cold. According to service manual, EGR valve is non-operational below 150F, "to improve drivability when cold."
82C (180F): getting warm. Thermostat begins to open, circulating coolant through the radiator. Some coolant is still bypassing the radiator.
95C (203F): fully warm. Thermostat is fully open, not bypassing the radiator at all.
100C (212F): boiling point of pure water at atmospheric pressure.
105C (221F): getting hot. Stock ECU will activate fans to cool the car down. Fan speed will be low, or medium (if A/C is already on).
108C (226F): hot. Stock 93-95 coolant thermoswitch activates, changing fan speeds from low>> medium (or med>>high if A/C is already on) (switching to an FC thermoswitch will change this temp to 203F)
115C (240F): getting dangerous. OEM temp gauge begins to rise.
117C (243F): dangerous. boiling point of pure water with 13psi pressure cap.
121C (250F): too hot. OEM temp gauge will point to white line. Boiling point of pure water with 16psi pressure cap.
124C (256F): way too hot. Boiling point of pure water with 19psi pressure cap. Boiling point of 50/50 coolant mix with 13psi pressure cap.
127C (260F): way too hot. OEM temp gauge will point to red line.


A Mazda competition preparation manual, dated 1980, gives the following recommendations. Note that this is for a non-turbo 12A motor in a racing environment:
Warm the engine up at an idle speed of 2000-2500 RPM, until the oil temp reaches 160F (70C).
Recommended coolant temperature (outlet side): 160-195F (70-90C).
Max coolant temperature: 205F (95C).
Recommended oil temperature (oil pan): 195-230F (90-110C).
Max oil temperature: 250F (120C).
--------------------------------------------

RX7 RAGE

iTrader: (22)

good info there Mike. I have my pfc set to turn on my fans at 86C.

mdpalmer

iTrader: (24)

^^ Oh there's more, again off topic

one
two (221F = 105C)

etc. etc.

That's not to say the OP doesn't have cooling issues though, I don't want anyone to take their water temps lightly... good luck to the OP in resolving your problem.