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Old 09-25-2012, 09:02 AM   #1
vermen1993
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Temperature Seems to Spike Under Load

I went to Dyno my car on Sunday, and the guy who dyno'd it said that whenever he put any load down on the gas pedal that the temperatures would spike (His computer was doing the readout). My needle stays under half (a little) no matter how hard or how long I drive it. Also, he said it spiked to 244 Degrees, which is stupid-high and has me worried, yet the car made it home without a problem. I'm having the radiator flushed right now and the shop is checking out my thermostat for me as well. Besides those two things, I'm not sure what could be causing this to happen, it's at a normal temp at idle as well. Both of the fans work I believe (At least I know the high fan works, not sure about the low fan because I can't really hear it while I drive and didn't check it before I brought it in). I searched the forums and came up with nothing so any help would be appreciated.

Thanks,
Stefan

Oh, and it pulled a whopping 101/108 on the dyno


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Old 09-25-2012, 11:11 AM   #2
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If the read out on your dash is different.than what the dynoers computer says someone's equipment is screwey. On a temp note heat under load could be caused by a stuck thermostat, fans not working, split head or bad head gasket. Checked your coolant levels at all? Also ask whoever is flushing the radiator to check for oil in the coolant. And Im not sure about the output on the 02's but I feel 101/108 rating for your car is way too low, might be another indication as to what the issue is, whether it be electronic or mechanical
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Old 09-25-2012, 11:41 AM   #3
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The Ford temp gauge is phony.
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Old 09-25-2012, 12:01 PM   #4
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Thanks for the replies. The coolant level was fine, they'll be checking the thermostat and all of the coolant will be new. If it doesn't change I'll check the head gasket tomorrow or whenever I get it back.

Sent from Stefan 's Phone
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Old 09-25-2012, 02:00 PM   #5
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I take it there was no oil in the coolant then. Also check the oil cap for sticky brown oil, or any signs theres coolant in the oil.
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Old 09-25-2012, 02:09 PM   #6
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Everythings fine.
The temp should rise under load. This is normal.
Depending on speed, the fans won't come on on the dyno. So you're relying on whatever the shop is using for a fan, most times inadequate.

I recommend finding a new shop. One that will be truthful and talk with you before telling you flat out there is something wrong with your car.
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Old 09-25-2012, 05:55 PM   #7
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There was no oil in the coolant and the mechanic said it drove like it should, nothing unusual. Iminhell, the place we went to dyno isn't the place I take my car for work, it was a car club event for my college and he was trying to help me out, no harm no foul. Besides, a coolant flush never hurt anyone and it was a little over due.

Sent from Stefan 's Phone
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Old 09-26-2012, 09:25 AM   #8
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Still dont understand why the the car only pulled 101/108?xD
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Old 09-26-2012, 07:01 PM   #9
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Neither do I haha, I'm gonna have my usual mechanic look at everything when I go back home. It's also a Mustang Dynp so it "reads low" (read: people complain about the low numbers they make and I'm not sure if that's a true statement or not)
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Old 09-27-2012, 03:06 AM   #10
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You may have run into one of the few honest dynos left. There is no way an absolute 130 HP motor should read 130 on a chassis dyno, at least it wasn't possible in the racing world I came from. I view most current readings displayed here and other places as worthless. Highly inflated.

No oil in coolant or no coolant in oil is not necessarily 100% proof there is no blown gasket, just highly indicative of such.

Stock zetec fans come on low around 230-235 degrees. The water temp gauge is highly damped, it will show the exact same in middle position from around 180 or so to around at least 240, in short, it is worthless. Set up like that stops lots of overheating warranty claims.
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