302 Fuel Consumption
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Freshman User
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From: Burkeville, VA, USA
302 Fuel Consumption
I have a 91 F-150 with a stock 302, the only change was removal of a bad A/C compressor. I have a idler pulley installed in it's place. On to the question/issue I am having.
I drive mostly country roads 55 - 60 MPHs, and very little in town driving 25 - 35 mph. I did have a miss fire and located a burnt spark plug wire, where it had been too close to the exhaust manifold. After changing the wires (yes, I changed and re-routed all of the wires), the truck went up to 15 MPG for one tank of fuel, then next three tanks have been right at 10 MPG. I am puzzled as how I could get that much of a drop without any obvious signs of problems.
I have checked all the wires, vacuum lines, cap, rotor, changed the coil with another one (no difference), checked fuel lines for leakage. I am stumped! Please Help!
I drive mostly country roads 55 - 60 MPHs, and very little in town driving 25 - 35 mph. I did have a miss fire and located a burnt spark plug wire, where it had been too close to the exhaust manifold. After changing the wires (yes, I changed and re-routed all of the wires), the truck went up to 15 MPG for one tank of fuel, then next three tanks have been right at 10 MPG. I am puzzled as how I could get that much of a drop without any obvious signs of problems.
I have checked all the wires, vacuum lines, cap, rotor, changed the coil with another one (no difference), checked fuel lines for leakage. I am stumped! Please Help!
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From: Burkeville, VA, USA
Yes I do have dual tanks, they both are getting the same MPGs. No I haven't checked for codes, as I do not have a code reader, I'll stop in by the auto parts store to have them read codes.
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Warm up the engine and transmission then do this: Ford Fuel Injection » How To Run a Self-Test
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The shortest trips I take in the truck are at least 20 miles. Most are 30 - 50 or more. But I do agree with you on the short trips, still I would expect at least 12 - 13 on short trips.
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From: Burkeville, VA, USA
Warm up the engine and transmission then do this: Ford Fuel Injection » How To Run a Self-Test
33 / 31 / 33 / 31 / 1 / 1 / 72 / 17 / 33 / 34 / 44 / 52 / 17 / 21 / 73 / 33 / 44 / 62
Not sure if these will make sense to you, but that's how I counted it.
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Der Postmeister
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From: Long Beach, Calimexiforia
Was engine at norm op. temp?
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Freshman User
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From: Burkeville, VA, USA
Sorry about that, yes those are read in KOEO... And the Engine was in Normal Operating Temp Range. ( I drove it about 25 - 30 miles just before testing, to warm it up. )
Senior User
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you may want to run the test again and recount. it should give a list of codes and then repeat the list, it looks like in the second group you have a number off on a couple codes.
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From: Burkeville, VA, USA
Ok, I had the wife come out with me and had her count the blinks as well. Today we came up with completely different results. Here's what I got. These were read KOEO...
11 / 66 / 36 / 11 / 43 / 34 / 11 / 66 / 36 / 11 / 43 / 34
11 / 66 / 36 / 11 / 43 / 34 / 11 / 66 / 36 / 11 / 43 / 34
Der Postmeister
Joined: Sep 2006
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From: Long Beach, Calimexiforia
How old is your O2 sensor. More than 60K miles, replace.
66 = TOT sensor input below self test, or vane air flow circuit below minimum (E4OD)
Never seen that code before! TOT = Transmission oil temperature sensor.
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Freshman User
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From: Burkeville, VA, USA
I recommend buying one of these: Equus Innova 3145 OBD-I Ford Scan Tool
How old is your O2 sensor. More than 60K miles, replace.
66 = TOT sensor input below self test, or vane air flow circuit below minimum (E4OD)
Never seen that code before!
How old is your O2 sensor. More than 60K miles, replace.
66 = TOT sensor input below self test, or vane air flow circuit below minimum (E4OD)
Never seen that code before!
As for the O2 sensor, no clue many miles since last O2 sensor. So I will look into replacing that.
Der Postmeister
Joined: Sep 2006
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From: Long Beach, Calimexiforia
I think I am going to reset codes, drive it a good 20 miles. Then I'll try reading codes once more. I was advised by my brother that he had disconnected battery last night after I read the codes!
As for the O2 sensor, no clue many miles since last O2 sensor. So I will look into replacing that.
As for the O2 sensor, no clue many miles since last O2 sensor. So I will look into replacing that.
This should pretty much clear your continuous memory codes & leave you w/ your actual "active" codes. & KOEO's should be dealt w/ before moving to KOER's in order for them (koer) to be considered reliable.
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From: Burkeville, VA, USA
Ok... Here's all the digits I got, should I be getting 3 digit codes and 2 digit codes? Here's what I found.
3 3 4 3 3 4 - 1 - 3 3 4 4 5 2 3 3 4 4 5 2
So I am guessing 334 / 334 / 1 / 33 / 44 / 52 / 33 / 44 / 52 ????
3 3 4 3 3 4 - 1 - 3 3 4 4 5 2 3 3 4 4 5 2
So I am guessing 334 / 334 / 1 / 33 / 44 / 52 / 33 / 44 / 52 ????