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Does anyone know the hertz a 90 F150 operates at? Trying to fine tune the idle some and I’ve never been able to find the answer. Mustang peeps are all over the place…
Does anyone know the hertz a 90 F150 operates at? Trying to fine tune the idle some and I’ve never been able to find the answer. Mustang peeps are all over the place…
use a dvom and find the low idle and then do it with an open throttle before fuel cut off, that will be a large portion of the range.
Does anyone know the hertz a 90 F150 operates at? Trying to fine tune the idle some and I’ve never been able to find the answer. Mustang peeps are all over the place…
Well, all over the place like 50-300hz, yup, big range.
2 wire or 3 wire IAC?
It is pulse width modulated(PWM) so, what do you have?
2 wire and yes, PWM. Using tunerstudio, I had it set at 124hz, anything higher and you could audibly hear the IAC through the air tube. 124 is where it became quiet so that’s where I stopped. I have been tinkering with my AC settings trying to tune out surging at idle. If ac is off, it never surges. A tuning friend looked at my tune and a data log trying to assist (couldn’t find time between the two of us to do it in person).
For S and Gs, I lowered the hertz to 92 and it took out most of the surging, but not all. I can always try stepping it down again to see if it fully stops. I would like to have it set up with the correct settings, that’s why I posed the question.
2 wire and yes, PWM. Using tunerstudio, I had it set at 124hz, anything higher and you could audibly hear the IAC through the air tube. 124 is where it became quiet so that’s where I stopped. I have been tinkering with my AC settings trying to tune out surging at idle. If ac is off, it never surges. A tuning friend looked at my tune and a data log trying to assist (couldn’t find time between the two of us to do it in person).
For S and Gs, I lowered the hertz to 92 and it took out most of the surging, but not all. I can always try stepping it down again to see if it fully stops. I would like to have it set up with the correct settings, that’s why I posed the question.
How about going a little lower to ~80–85 Hz?
Is idle stable without AC, if it is, then your idle control is fine, its the control loop that reacts to additional load is the problem.
Surging is the direct result from over correction oscillation.
You don't mention anything about Duty Cycle. Once your frequency is set, you then tune it in using duty cycle or lower adders.
I recall that topic was touched on in this thread Post# 23
I thought I would update and let everyone know that a new IAC valve solved my cold start problem.
Also, it's worth noting that the base tune from Stinger comes with the frequency for the IAC set to 99Hz, which seems to work fine, but causes the IAC to buzz.
I read somewhere that the Ford ECU pulses the IAC at 300Hz. Tunerstudio didn't have an option for 300Hz exactly, but it had a value that was very close (306Hz if memory serves me right). When I changed to that value the buzzing stopped and the IAC seems to work as desired.
Hearing a "IAC buzz" at 90hz, is 90 x second vs 300 times per second. Yes, would definitely sound like the buzzing stops.
Does anyone know the hertz a 90 F150 operates at? Trying to fine tune the idle some and I’ve never been able to find the answer. Mustang peeps are all over the place…
ONLY the MAP sensor deals in Hz.
And that Hertz reading from the MAP sensor coincides with your altitude
You are asking about "Baud rate" or how fast your processor is?
Baud rate and processor speed are the two metrics
Let us just say, not quick enough
I can "feel" my 94 surge, and the fuel injection system keeping up / trying to keep up
We used to tell folks it was the loose timing chain and that affecting the CMP (mostly all bull sheet)
Good luck with answers
If you Google "baud rate and processor speed of a 1990 EEC 4 system", it says it uses an INTEL 8061 processor chip and operates in a 15 MHz crystal
The Mustang boys are always all over the place with answers and wrong info just like here (I know, I'm one of them)
“ONLY” is bold… surprised the Star Tester didn’t get called to solve this problem.
Injectors, IAC, and other actuators all operate at a frequency (Hz), but they’re PWM-controlled—the ECU adjusts pulse width (duty cycle), not the frequency.
“ONLY” is bold… surprised the Star Tester didn’t get called to solve this problem.
Injectors, IAC, and other actuators all operate at a frequency (Hz), but they’re PWM-controlled—the ECU adjusts pulse width (duty cycle), not the frequency.
How many H manuals have you read wwhite?
Do they mention frequency ever in any of the testing anywhere except for the MAP? sensor
I suppose you are going to tell him to grab an oscilloscope and do some Hz testing?
The quack portion for you is frequency only applies to AC voltage, not DC, so you need to rethink ******* me about what you know vs what I know
Sorry, I didn’t mention anything else on settings. I know they play a factor (still learning this!) but obviously each HERTZ setting affected how it operates, hence the question! I assumed (my bad) they were designed and tuned using a specific frequency. Again, still learning! Any input is always welcome, even if it’s to get the NGS!
Red circle is why I posed the question. @rla2005 thanks for the link! I tried running it higher, but kinda made it a little worse. I didn’t have time to adjust things like duty cycle and adder yet though! Might not have seen it as I have been searching for megasquirt tuning, not pimpx (I have a different company, but both MS based).
@manicmechanic007 I do not run a ford eec-IV. It is a full standalone.
How many H manuals have you read wwhite?
Do they mention frequency ever in any of the testing anywhere except for the MAP? sensor
I suppose you are going to tell him to grab an oscilloscope and do some Hz testing?
The quack portion for you is frequency only applies to AC voltage, not DC, so you need to rethink ******* me about what you know vs what I know
I'm pretty sure the OP knows what they are talking about and asking about with regards to IAC frequency and PWM.
Who is saying anything about AC vs DC? Whos ******* who?
I'll pull out my clown horn, honk! honk!
Never said you know anything, didn't say you know something either.
Since your a duck and quacking, this is FYI for you @manicmechanic007
"ANY electrical signal—like PWM or digital pulses in automotive “DC” systems—has frequency measured in Hz."
A further trying to solve this today. It noticed that when I turn the AC on, for some reason it removes the truck from closed loop for about 5 seconds. During that time, it idles about 50-75 rpm’s lower. Then closed loop turns back on and so does the surging. Once it surges high enough, closed loop shuts off and truck idles back to smooth, but lower rpm, but steady. After 3-5 seconds, closed loop comes back on and repeats this cycle… when the AC is off, nice and steady idle.
Even with turning off AC idle up function, it still does it..
A further trying to solve this today. It noticed that when I turn the AC on, for some reason it removes the truck from closed loop for about 5 seconds. During that time, it idles about 50-75 rpm’s lower. Then closed loop turns back on and so does the surging. Once it surges high enough, closed loop shuts off and truck idles back to smooth, but lower rpm, but steady. After 3-5 seconds, closed loop comes back on and repeats this cycle… when the AC is off, nice and steady idle.
Even with turning off AC idle up function, it still does it..
you have a 1990 which some 1990 5.0 for sure had a TSB with regards to using a IAC spacer in order to modify the behavior of the IAC and the throttle plate plugs and the minimum air set screw.
