So here are some pics of the scope (not very good). At idle I got a nice square wave on the white wire, when I rev the engine the wave gets distorted and not much change in voltage. I get 3v on the red wire and of course no wave.

 

Problem is getting worse truck wont stay idling in park unless I have the vacuum hose unhooked. I tried to get a video of the strange humming and vibrating from the air cleaner assembly when the IAC is plugged in. Can't really hear it with all the other noise.

https://www.youtube.com/watch?v=9BFh...ature=youtu.be

 

Bueller Bueller... Anybody? I know the pics of the scope suck, I can do a video of the test tomorrow.

There has to be a major problem with the IAC or the computer. Is it possible the new IAC I got is defective?? I think the brand was BWD from Advance Auto.

The IAC should not make the whole air cleaner assembly hum and vibrate. Never heard or saw that on any of my vehicles and never remember this truck doing it until the major idle problems I have now.

 

Video of o-scope on IAC

https://www.youtube.com/watch?v=WJDC...ature=youtu.be

 

Merry Christmas everyone!

I got a code reader and with the KOEO I get code 11 then when it checks CM I get code 87 Primary fuel pump circuit fault and 96 fuel pump secondary circuit fault/high speed fuel pump relay open.

Any idea's? Both fuel pumps are new

 

Those could have been there for a while. I would clear the codes with the STI wire and then drive it and see if any codes come back in CM.

 

So I cleared codes. drove truck and now I get 11 system pass for KOEO no other codes.

KOER I get code 13 low idle, 41 HEGO (HO2S) sensor voltage low/system lean, and 65 overdrive cancel switch not changing state, transmission fault. ( i did hit the on/off switch during the test and my cruise works)

 

Maybe low fuel pressure.
Did you check it with a gauge?

 

The first time I did KOER it didn't throw code 41 just 13 and 65 but I did it again because of the code 65. So the second KOER I got the 13, 41, 65.

So I was thinking of doing the O2 sensor tomorrow and I will check the fuel pressure also.

Do you have a recommendation for a fuel pressure tester I can buy tomorrow?

 

Most auto part stores rent them or you can buy one from them.

I have this one, note the Ford adapter in the photo.:






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The local store has that tester I will pick one up tomorrow, can never have enough tools LOL! I will test the fuel pressure first since the O2 sensor is $50.00. So from your pics I'm looking for 30 while at idle and 40 with KO and I'm assuming the fuel pump relay jumped?

Since both of my pumps are new if I have a fuel pressure problem would the fuel pressure regulator be the most common problem?

 

Depending on the vacuum about 30-32psi at idle and about 40psi KOEO with 2 to 6 jumped in the self-test plug and the key on.

With new fuel pumps you may have junk around the socks at the bottom of the fuel module if the tanks were not cleaned out. Could also be a plugged filter or the regulator stuck open not but not likely however.



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So my fuel pressure is 32 running and 40 when jumped KOEO.

I replaced O2 sensor and PCV valve cleared codes and no change. Get code 11 KOEO and still get 13, 41 and 65 KOER

What should I try next?

 

KOER:
13 = KE15 SERVICE CODE 13


Service Code 13 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test lower limit band.


Possible causes:
-- Improper idle air flow set.
-- Vacuum leaks.
-- Throttle linkage binding.
-- Throttle plates open.
-- Improper ignition timing (TFI vehicles only).
-- Throttle body/ISC solenoid contamination.
-- ISC circuit short to ground.
-- Damaged ISC solenoid.


Does engine idle speed appear normal?
Yes
REMOVE ISC solenoid and INSPECT for contamination. If contamination is present, REFER to «Section 9A» to determine if solenoid is a type that can be cleaned.
No contamination present or solenoid cannot be cleaned:
REPLACE ISC solenoid. RERUN «Quick Test».
Solenoid is contaminated and can be cleaned:
CLEAN as necessary (REFER to «Section 9A»). RERUN «Quick Test». If code/symptom is still present, REPLACE ISC solenoid.


No
RESET idle airflow to specification. REFER to «Section 9A» for idle airflow adjust procedure. If UNABLE to RESET idle to specification, GO to «KE16».

 

Code 41 system indicates lean.
Service Code 65 indicates that Overdrive Cancel Switch (OCS) is not cycled between the engine ID code and the "Goose Test" in Key On Engine Running Self-Test.