1994-2004 V-8 GT, GTS, Bullitt, Mach 1, and Cobra

Awful Gas Mileage

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Old 3/28/12, 08:52 PM
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Originally Posted by bluethunderhorse
Quick way to check for a vacuum leak, is to spray wd40 around the mating surfaces. If you hear any change in the way the engine runs, in any certain place then you've narrowed your search.
Wd40!?!?


OP do not use wd40 unless you want a very oily intake/engine. Use brake clean or Carb cleaner as these willchange the idle without causing a nasty oily mess
Old 3/28/12, 11:46 PM
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What level is your coolant and how long does it take for your motor to heat up and if you aren't too sure check it out to see if it even gets to operating temp and let me know
Old 3/30/12, 03:36 PM
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You're thinking tstat? I'm not sure exactly what temp the car is getting to but I can check.
Old 3/30/12, 07:31 PM
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Originally Posted by texastboneking
Wd40!?!?


OP do not use wd40 unless you want a very oily intake/engine. Use brake clean or Carb cleaner as these willchange the idle without causing a nasty oily mess
+1 on the carb cleaner. WD40 thats a new one
Old 3/30/12, 10:02 PM
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The computer says 97 Celsius or about 205 Fahrenheit. Idle speed is at 700.
Old 4/2/12, 12:28 AM
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Originally Posted by cntchds
You're thinking tstat? I'm not sure exactly what temp the car is getting to but I can check.
Yeah I was thinking tstat but its getting up to normal op temp what about overheating at all
Old 4/2/12, 01:21 PM
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Nope. Stays steady at just over 200 independent of outside temp. I'm running a tank of 91 octane Chevron to rule out if it was just bad gas.
Old 4/3/12, 10:36 AM
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Is yours a gt? When I had my 01' it idled around 4,500-5,000... 8,000 is pretty high for you.
Old 4/3/12, 01:05 PM
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Originally Posted by benjyc32
Is yours a gt? When I had my 01' it idled around 4,500-5,000... 8,000 is pretty high for you.
I think you need to remove a zero, or take your foot off the gas when your at idle.
Old 4/3/12, 01:11 PM
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Originally Posted by 1999Pony

I think you need to remove a zero, or take your foot off the gas when your at idle.
If that's the idle would like to know the redline. lol
Old 4/3/12, 01:13 PM
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Especially if your idling at 8k
Old 4/3/12, 02:05 PM
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Originally Posted by 1999Pony

I think you need to remove a zero, or take your foot off the gas when your at idle.
My bad, 450-500... it's been a long day in the blazing heat of Tn.. But I vacuumed the inside, washed, and waxed my car, and detailed my my motor bay and made everything shiny for the car show this weekend!
Old 4/3/12, 03:50 PM
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Originally Posted by benjyc32

My bad, 450-500... it's been a long day in the blazing heat of Tn.. But I vacuumed the inside, washed, and waxed my car, and detailed my my motor bay and made everything shiny for the car show this weekend!
Haha its all good, just had to give you a little crap at least.
Old 4/3/12, 04:08 PM
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Originally Posted by 1999Pony

Haha its all good, just had to give you a little crap at least.
Ha yeah, I mind has been in 50 different places over the past week due to a concussion. So I may sound blazed.
Old 4/3/12, 08:44 PM
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How often do you run 91 octane a lot of people believe its okay to but the only time you want to run a higher octane is when you raise the compression ratio and there's no bad gas maybe a bad fuel filter restrictive fuel rails maybe a bad injectir
Old 4/4/12, 02:00 PM
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The owners manual says that should use 89 octanes. Have you try before?
Old 4/4/12, 06:45 PM
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Originally Posted by mdelao
The owners manual says that should use 89 octanes. Have you try before?
Yeah, I usually run 89.

Originally Posted by shaunrc
How often do you run 91 octane a lot of people believe its okay to but the only time you want to run a higher octane is when you raise the compression ratio and there's no bad gas maybe a bad fuel filter restrictive fuel rails maybe a bad injectir
This was a first. Just to experiment.
Old 4/4/12, 08:31 PM
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Originally Posted by cntchds

Yeah, I usually run 89.

This was a first. Just to experiment.
Have you checked your coil packs to make sure they are all on secure I know it sounds stupid but sometimes those plastic caps break and the coil could lose its connection causing a hesitation or low fuel economy
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