Mike
1986 Mustang convertible ---> BUILD THREAD
Past Fox-chassis "four eyes":
1983 Mercury Cougar LS
1986 Ford Thunderbird ELAN
1980 Capri RS Turbo
Work in progress website ---> http://carb-rebuilds-plus.boards.net/
Yep, it would seem, but 2 new sensors with the same results says either Napa had a really bad run, or the test isn't appropriate for MAF vehicles (which I wondered since the test states to check voltage with vacuum applied... Not a scenario our vehicles will ever run into).
In reading some other threads on this issue, to test a BP sensor, frequency is what is necessary to test, voltage is not. So the Hz measurement is only necessary to be tested on the MAF vehicles, at Idle or with KOEO, since vacuum is never applied to the BP sensor.
Maybe my logic is flawed...wouldn't be the first time.
85 GT Hatchback, T-Tops. 2012 Coyote 5.0L Swap, T56 Magnum, GT550 Dept of Boost kit, with Eaton M122 SC, RAM 11" Powergrip clutch, BBK Long Tubes/OR X-Pipe, Flowmaster Axle Back, Stifflers DS Loop, and Rear X-member, AJE Tube Crossmember with AJE-Mod Mounts, 3.73 Posi 8.8, 5 lug Cobra 13" fr and 12.6" rear disc swap, 2004 Hydroboost Swap, MM SubFrame Connectors, MM Panhard Bar, MM front A-Arms, MM rear control arms, MM CC Plates, MM Coilovers w/Koni dampeners, MM Torque Arm (soon to be installed).
Frequency at sea level should be around 153, and go down as altitude increases. 165 says you're about a quarter mile underground...
Jim DeAngelis
Cornucopia of Useless Knowledge
Connoisseur of Dearborn Ferrous Oxide
'83 GT hatch, currently under the knife
'79 Capri 2.3L n/a, Medium Copper metallic, survivor
(bought from MRausch82)
Look back in the frequency section, it says around 160 with no vacuum, and with vacuum applied, the value goes down. 5 Hz over their approximation is not a big deal. If it were 180 or 190, then it would be far under sea level.
85 GT Hatchback, T-Tops. 2012 Coyote 5.0L Swap, T56 Magnum, GT550 Dept of Boost kit, with Eaton M122 SC, RAM 11" Powergrip clutch, BBK Long Tubes/OR X-Pipe, Flowmaster Axle Back, Stifflers DS Loop, and Rear X-member, AJE Tube Crossmember with AJE-Mod Mounts, 3.73 Posi 8.8, 5 lug Cobra 13" fr and 12.6" rear disc swap, 2004 Hydroboost Swap, MM SubFrame Connectors, MM Panhard Bar, MM front A-Arms, MM rear control arms, MM CC Plates, MM Coilovers w/Koni dampeners, MM Torque Arm (soon to be installed).
... and without vacuum applied, AKA atmospheric pressure, barometric pressure. MAP/BP same diff. Why you figure MAF conversion just requires no vacuum hose connected? Same sensors, same output.
The test results the OP at 300ft elevation should be getting are the test listed less than 1.66v and 158Hz*.
BP at 300ft = 14.537psi*
*Calculated from figures in table at: http://www.sensorsone.com/altitude-p...ts-conversion/
Interpolation with the voltage test results chart suggests a long, LONG way below sea level.
Dimensional analysis* & interpolation* using the same linked table above, of a 165Hz test result, equals greater than 1000ft below sea level.
* 14.696psi / 160Hz = x / 165Hz
x = 165Hz / ( 14.696psi / 160Hz )
x = 15.437psi
VREF was tested earlier at 5v... unless VREF has increased, where else does less resistance (greater output voltage, which is converted to frequency or vice versa) come from?...
Mike
1986 Mustang convertible ---> BUILD THREAD
Past Fox-chassis "four eyes":
1983 Mercury Cougar LS
1986 Ford Thunderbird ELAN
1980 Capri RS Turbo
Work in progress website ---> http://carb-rebuilds-plus.boards.net/
Mike
1986 Mustang convertible ---> BUILD THREAD
Past Fox-chassis "four eyes":
1983 Mercury Cougar LS
1986 Ford Thunderbird ELAN
1980 Capri RS Turbo
Work in progress website ---> http://carb-rebuilds-plus.boards.net/
Looks like I remembered the measurement incorrectly... just retested and its 155.4 Hz... I just remembered wrong. Either way, the car is running well.
I reset the fuel pressure to 40psi without the vacuum hose connected. When I bleep the throttle, it drops to about 36 psi.
85 GT Hatchback, T-Tops. 2012 Coyote 5.0L Swap, T56 Magnum, GT550 Dept of Boost kit, with Eaton M122 SC, RAM 11" Powergrip clutch, BBK Long Tubes/OR X-Pipe, Flowmaster Axle Back, Stifflers DS Loop, and Rear X-member, AJE Tube Crossmember with AJE-Mod Mounts, 3.73 Posi 8.8, 5 lug Cobra 13" fr and 12.6" rear disc swap, 2004 Hydroboost Swap, MM SubFrame Connectors, MM Panhard Bar, MM front A-Arms, MM rear control arms, MM CC Plates, MM Coilovers w/Koni dampeners, MM Torque Arm (soon to be installed).
even 40psi is a bit high at warm idle. KOEO should be 40, with KOER (warm idle) around 35.
Jim DeAngelis
Cornucopia of Useless Knowledge
Connoisseur of Dearborn Ferrous Oxide
'83 GT hatch, currently under the knife
'79 Capri 2.3L n/a, Medium Copper metallic, survivor
(bought from MRausch82)
With KOEO, I get no more than 25 psi from the short primer. I'm only checking fuel pressure with KOER
85 GT Hatchback, T-Tops. 2012 Coyote 5.0L Swap, T56 Magnum, GT550 Dept of Boost kit, with Eaton M122 SC, RAM 11" Powergrip clutch, BBK Long Tubes/OR X-Pipe, Flowmaster Axle Back, Stifflers DS Loop, and Rear X-member, AJE Tube Crossmember with AJE-Mod Mounts, 3.73 Posi 8.8, 5 lug Cobra 13" fr and 12.6" rear disc swap, 2004 Hydroboost Swap, MM SubFrame Connectors, MM Panhard Bar, MM front A-Arms, MM rear control arms, MM CC Plates, MM Coilovers w/Koni dampeners, MM Torque Arm (soon to be installed).
There are a few more items to be checked or considered here that have not been mentioned that could cause a rich idle.
First, pull the IAT sensor off and check to see if it's coked up.
Second, check the voltage output at idle of the coolant temp sensor for the ECM, there's a chart for that that will tell you what it should be for 190*-200*.
Third, determine if the T-stat is opening to soon and the engine is not coming up to temp, I prefer a 192* T-stat for the best driveability. I tried a 180* and it just didn't like it and I could tell the difference immediately.
Let us know. Good luck.
You said IAT, did you mean IAC? If so, mine is brand new.
85 GT Hatchback, T-Tops. 2012 Coyote 5.0L Swap, T56 Magnum, GT550 Dept of Boost kit, with Eaton M122 SC, RAM 11" Powergrip clutch, BBK Long Tubes/OR X-Pipe, Flowmaster Axle Back, Stifflers DS Loop, and Rear X-member, AJE Tube Crossmember with AJE-Mod Mounts, 3.73 Posi 8.8, 5 lug Cobra 13" fr and 12.6" rear disc swap, 2004 Hydroboost Swap, MM SubFrame Connectors, MM Panhard Bar, MM front A-Arms, MM rear control arms, MM CC Plates, MM Coilovers w/Koni dampeners, MM Torque Arm (soon to be installed).
Mike
1986 Mustang convertible ---> BUILD THREAD
Past Fox-chassis "four eyes":
1983 Mercury Cougar LS
1986 Ford Thunderbird ELAN
1980 Capri RS Turbo
Work in progress website ---> http://carb-rebuilds-plus.boards.net/
Mike
1986 Mustang convertible ---> BUILD THREAD
Past Fox-chassis "four eyes":
1983 Mercury Cougar LS
1986 Ford Thunderbird ELAN
1980 Capri RS Turbo
Work in progress website ---> http://carb-rebuilds-plus.boards.net/
Well, I currently have a 165 thermostat in the car... I also have a 190 degree, tomorrow I will see if I can get a 180 degree thermostat. Car runs at 180 solid, with the 165 degree thermostat, and comes up to temperature as expected (not too slow, not too fast).
Mike, I really appreciate the test procedures. I will let the car warm up and will back probe both sensors, and then on the ACT sensor, I should see 5v reference at the LG/P wire, then across the two pins see what the voltage is based upon the chart, correct? On the ECT, should get 5v on the LG/Y wire, then .8 volts across the 2 wires when my temp gauge shows about 175 degrees.
Any good way to tell the temp of the ambient air in the manifold, so I can verify what value to look for?
85 GT Hatchback, T-Tops. 2012 Coyote 5.0L Swap, T56 Magnum, GT550 Dept of Boost kit, with Eaton M122 SC, RAM 11" Powergrip clutch, BBK Long Tubes/OR X-Pipe, Flowmaster Axle Back, Stifflers DS Loop, and Rear X-member, AJE Tube Crossmember with AJE-Mod Mounts, 3.73 Posi 8.8, 5 lug Cobra 13" fr and 12.6" rear disc swap, 2004 Hydroboost Swap, MM SubFrame Connectors, MM Panhard Bar, MM front A-Arms, MM rear control arms, MM CC Plates, MM Coilovers w/Koni dampeners, MM Torque Arm (soon to be installed).
Voltage or resistance (I'd check both. I'm weird like that) for ACT/ECT sensors, yes.
Too many variables for ACT after running. Unless you're able to somehow measure the air temperature inside in the area of the sensor tip, like removing it and measuring the temperature in the hole... you should be safe assuming the temperature outside (hopefully 50+ Fahrenheit, as per the chart above) or wherever the car is, is what temperature the air inside the intake will be... and take note of the last sentence in paragraph four up there for ACT too, regarding corrosion/extra resistance (and/or viewed as dead nuts continuity between sensor and brain box) of connections/circuit and what happens with air:fuel mixture...
Last edited by Walking-Tall; 02-13-2018 at 09:40 PM.
Mike
1986 Mustang convertible ---> BUILD THREAD
Past Fox-chassis "four eyes":
1983 Mercury Cougar LS
1986 Ford Thunderbird ELAN
1980 Capri RS Turbo
Work in progress website ---> http://carb-rebuilds-plus.boards.net/
My car is a gas sucking pig when running a 160 or a 180. Good performance but loses 6-7 MPG highway. I run a 195 exclusively after those experiments
I've never done any big hp mods, but I've found the 195 t stat to bee good as well.
A 180 stat didn't seem to hurt mileage on long trips, but in winter time it took forever to warm up and the heater sucked. Usually took about 25 miles of driving to get it up to temp on a cold summer morning.
With the 195 stat I didnt over heat on a 110° day sitting in traffic after a 45 minute freeway drive. This was on a 86 cougar with 300+k miles on it.
My old tbird I even had working a.c. and same thing, never an issue. I drove that car 7 days a week for a year and a half and put around 80k miles on it with multiple 1500 mile trips everywhere from Montana in winter (started good at -25°f with no block heater) and down to southern utah with 115° temps.
I've bought a few cars the previous owner put a 180 t-stat in and it kills mileage.
2 1986 cougars (both 4 eyed and 5.0)
1 1987 cougar
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