just an FYI if your fuel mileage is down - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 06-23-2012, 09:10 AM Thread Starter
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just an FYI if your fuel mileage is down

I've had a Mini Maxx on my truck since the day after I bought it.

I've always monitored ECT and EOT. Here a few months ago, I noticed my ECT was down from it's normal 195-197 to 192. And as I coasted down coming off the highway, it was down to 188.

Thermostats were hanging open.

I had a big drive out to west TX and back and asked my mechanic if I'd be alright. He said yes, but you're going to be down a couple MPG.

Well, I've been nursing the truck for almost 3 months. Just been way busy. I don't idle the truck, and I don't putt around town. If I'm driving, it's at highway speed, and the truck will maintain 188-192 most of the time.

So I'm about to take a 3-4wk vacation in Colorado, and I know I'll be doing a lot of short trips, slow speed/no load, and colder ambient temps, so it's time to get the thermostats done.

Coming home from my buddy's shop last night doing 67mph, ECT was 195-197, and the lie-o-meter showed 19.4mpg

I KNEW what I had going on because I had a good scan gauge type display in my mini-maxx, but without it, the water temp dummy gauge on the dash showed to be just fine.

I DID get a CEL indicating "coolant thermostat performance" twice, but only here in the last month.

If you seem to be down 2-3mpg without any good explanation, I'd monitor the ECT PID and see what your TRUE temp is. You might be due for some thermostats!
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post #2 of 13 Old 06-23-2012, 09:36 AM
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thanks for the tip, I have only 78,000 on my 2000 7.3 and was wondering if I should change the coolant and stat. Looks like I should.
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post #3 of 13 Old 06-23-2012, 10:26 AM Thread Starter
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I don't see it being a huge problem on a 7.3, but can't hurt to PM the thing anyhow

the emissions are so strict on the 6.4, they have a tight optimal temperature range, and if you're not in it, it works hard to get there
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post #4 of 13 Old 06-24-2012, 05:44 AM
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How was it changing them out? Is there a write up on it?

09 F-350 H&S Mini Maxx, 4" Flo-Pro downpipe back, S&B Intake, 35X12.50 Nitto Trail Grapplers, 20" Black/Machined Ultra Phantom wheels, Bushwacker pocket flares, B&W hitch, Rhino lining, Tinted lights, Recon cab lights, Alpine M500 AMP, 2 10" JL Audio W1's, Glow Shift 3in1 Gauge, Bak Flip Tonneau Cover, Spyder LED Tail lights, Spyder Halo Projector headlights
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post #5 of 13 Old 06-24-2012, 06:20 AM
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Whenever coasting down a big hill mine drops to 188 other then that the average temps are 194. I have a random puming problem and dealer thinks its thermostats. I think my thermostats are fine maybe I am wrong

01/07 Job 1 F350 H&S Tuned. ARP Studs, AFE 4'' straight pipe, EGR delete with elbow, AFE stage 2 CAI, 6'' lift on 37s, 20x12 Fuel Nuts two piece, Sinister coolant filter, CCV Mod, Projector headlights HID kit
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post #6 of 13 Old 06-24-2012, 07:38 AM Thread Starter
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Quote:
Originally Posted by 4playin View Post
How was it changing them out? Is there a write up on it?
it's a PITA if your EGR coolers are still in place (as mine are)

hence paying my mechanic a few hundred to do it for me!
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post #7 of 13 Old 06-24-2012, 01:48 PM
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Yeah I should of known but just thought I would ask.

09 F-350 H&S Mini Maxx, 4" Flo-Pro downpipe back, S&B Intake, 35X12.50 Nitto Trail Grapplers, 20" Black/Machined Ultra Phantom wheels, Bushwacker pocket flares, B&W hitch, Rhino lining, Tinted lights, Recon cab lights, Alpine M500 AMP, 2 10" JL Audio W1's, Glow Shift 3in1 Gauge, Bak Flip Tonneau Cover, Spyder LED Tail lights, Spyder Halo Projector headlights
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post #8 of 13 Old 01-12-2013, 06:39 PM
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Low water temp

I seem to be getting low water temps. Highway 192-194 rolling to a stop sign it drops to 186-188. Outside Temps have been around 40.

2008 F250 Lariat 4 Door Crew Cab, H&S Minn Maxx S&B intake, sinister coolent filter
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post #9 of 13 Old 01-12-2013, 06:54 PM Thread Starter
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I'm betting thermostats hanging open. You'll likely get a coolant thermostat performance code before long
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post #10 of 13 Old 01-12-2013, 07:39 PM
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Quote:
Originally Posted by drunk on diesel View Post
I'm betting thermostats hanging open. You'll likely get a coolant thermostat performance code before long
Where are the thermostats located, easy job or hard and are they cheap.

Sent from the can!

2008 F250 Lariat 4 Door Crew Cab, H&S Minn Maxx S&B intake, sinister coolent filter
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