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TT_Vert · 09-16-2021, 06:32 PM

It seems the hard plastic hoses are color coded and have the typical 90s ford "plug" that each passes through. I have one red hose coming from somewhere that is on the passenger valve cover w/a bolt plugging it. Not a factory solution for sure but some mention this may have just been used for HVAC on some vehicles so it's just plugged by design. I get a periodic CEL while driving so i pulled codes today and got KOER codes 311 (Pulse air/thermactor air system faulty), 332 EGR valve not opening and 536 Brake on/off (BOO) switch not activated during self test (This one perhaps is user error, I thought i hit the brake but maybe not). I feel the first two may be related to this vacuum line. I'll start testing things after I figure out this one particular vacuum line.

Thanks
Dave

GypsyR · 09-16-2021, 08:30 PM

Another member here has a LOT of Ford reference material and would know for sure but he may not be available just now.
But without looking I am ready to swear my 1993 has a red line aimed toward the passenger footwell. In my case blocked nice and neatly like the factory did it.
I can't find the diagram I thought I had saved but I spotted a similar one online and it did show a red line going the the HVAC system in a truck. Since our "truck" HVAC's are crossbred Ford/Evans systems they don't use that line.

TT_Vert · 09-16-2021, 08:43 PM

Quote:

Originally Posted by GypsyR

Another member here has a LOT of Ford reference material and would know for sure but he may not be available just now.
But without looking I am ready to swear my 1993 has a red line aimed toward the passenger footwell. In my case blocked nice and neatly like the factory did it.
I can't find the diagram I thought I had saved but I spotted a similar one online and it did show a red line going the the HVAC system in a truck. Since our "truck" HVAC's are crossbred Ford/Evans systems they don't use that line.

Yeah I've been doing a bunch of research. I have to assume this applies to the F53 chassis as well but they color coded the hard lines. I believe white goes to HVAC blend doors, unsure about anything else. Tomorrow I'l do some testing of the EVP, TAB/TAD and EGR itself. I cut my teeth on fox body mustangs so this isn't all that new to me but it's been a LONG time since I've messed w/ such a primitive setup.

Quote:

For colored hard plastic vacuum lines under the hood:
RED is the Ford standard color (different function in the dash) for manifold vacuum (the MAP, HVAC, VMV, & brake booster are notable exceptions - they're black, but also larger than the colored 5/32" hard lines)
BLACK (5/32" hard plastic only, shown Dk.Gray) is the Ford standard color for checked or reservoir vacuum
PINK is the Ford standard color for TAB (Wh/Or wire)
YELLOW is the Ford standard color (different function in the dash) for TAD (Br wire)
GREEN is the Ford standard color for EGR (Br/Pk wire)
WHITE is the Ford standard color for the fresh/recirc door for the HVAC system

Dave

subford · 09-16-2021, 08:56 PM

This may help:

/

TT_Vert · 09-16-2021, 10:59 PM

Quote:

Originally Posted by subford

This may help:

/

thanks, yeah i found that too looking up google images. Any chance that you know fi the 460s in the 94 chassis would be Sequential or multi port EFI?

Dave

avfordguy · 09-16-2021, 11:36 PM

If I remember right, the 460 efi is bank fire injectors, not sequential.

TT_Vert · 09-16-2021, 11:57 PM

Quote:

Originally Posted by avfordguy

If I remember right, the 460 efi is bank fire injectors, not sequential.

if it is in fact batch fire that'd explain why i cannot do a cylinder balance test on this thing.

Dave

subford · 09-17-2021, 06:02 AM

Quote:

Originally Posted by TT_Vert

thanks, yeah i found that too looking up google images. Any chance that you know fi the 460s in the 94 chassis would be Sequential or multi port EFI?

Dave

That one above is the one that I made.
There is the one on your engine also. It is on the left rocker arm cover as in this photo and diagrams below.

It is multi port EFI bank injected.

/

TT_Vert · 09-17-2021, 05:28 PM

Thank you, there is no spot at all available on my valve covers for this label. Various emissions brackets for cannister purge valve, AIRD/AIRB, etc. sit atop the right cover and TAB/TAD/EVR on left side. With that said I'm about at a dead end here. I'm not exactly sure what criteria the computer is looking for or what it does to test that exactly but I have an idea. This is what I've done/discovered so f

Each vacuum hose is clear and holds vacuum (Zero leaks)
I see vacuum sources to TAB/TAD/EVR (20hg and steady)
the vacuum reservoir holds a vacuum on both sides and the check valves on the vacuum source side are functioning
The EGR valve is functioning (I can apply vacuum and kill the motor)
the EVP is functioning (I ohmed it out and w/ EGR fully closed I see 3.7K ohms with no vacuum and 850 ohms w/ EGR fully opened (Vacuum applied)
During the KOER I see the TAD/TAB getting vacuum and I can manually open the valves w/ vacuum (Or so I think as I hear them moving).
I see 12VDC to TAB/TAD/EVP. I assume ECM triggers via ground on these but I don't have a pinout for this ECM.
During KOER I see vacuum from TAB/TAD go from 0 to 20hg mid test indicating they are seeing the vacuum they should. I see 3.5hg of vacuum at EGR about 2 seconds before end of test. I'm not sure how much vacuum the EGR should see but I do think it does see a low amount of vacuum regulated by the EVR (Can anyone confirm this). I read this on an F150 site "During the test the EVR will apply vacuum to the valve--should go to about 5-6 inches of vacuum and then release."
I saw a white paper on testing the EVR and it describes testing it's function. I'm going to have to unbolt it to ohm the coil on it as I have limited access to the terminals.

What does baffle me a bit is that when I do KOEO I get 111 111 so that is no faults right? The first is current and the second is memory correct? I occasionally get a CEL while driving and from what I read is that it takes between 40-80 ignition cycles w/o fault to clear these. I have NOT gone through even 40 cycles since my last CEL so that is a bit confusing. I'm assuming the CEL was caused by one of the KOER codes but w/o actually having any code in memory I have no real idea.

Thanks
Dave

subford · 09-17-2021, 07:23 PM

Quote:

Originally Posted by TT_Vert

What does baffle me a bit is that when I do KOEO I get 111 111 so that is no faults right? The first is current and the second is memory correct?

No it is not.
You would need to get:
111 111 1 111 111

The first two sets of (111 111) is fot the KOEO.
Then a separator (1).
Then the stored codes, the second set of (111 111).
Then you would have no faults.

TT_Vert · 09-18-2021, 01:10 AM

Quote:

Originally Posted by subford

No it is not.
You would need to get:
111 111 1 111 111

The first two sets of (111 111) is fot the KOEO.
Then a separator (1).
Then the stored codes, the second set of (111 111).
Then you would have no faults.

I'll double check this. I know no more codes were output during KOEO so more than likely I did get the separator and the additional 111s. I probably just didn't write it down knowing it was the same.

Dave

donr103 · 09-18-2021, 01:44 AM

If you go to auto parts store and grab a book for 1994 f250 or f350 ford pick ups.. it's same eng and trans.. and will have pins read out for ecm.. also more trouble shooting advice..are you original owner..? And are you using ford obd1 code reader ? What type of code reader are you using ? I thought these eng of that year go into cylinder balance test first 5 mins of KOER TEST.. at least mine does.. I have similar system in my 1993 conversation van.. so there is no forcing balance test.. ecm does it automatically first 5 mins of KOER TEST.. on mine.. when you get signal 10.. there are 4 operator test you must do.. 1st turn steering wheel slightly and hold for 5 to 15sec.. 2nd hit overdrive switch 3rd brake 4th hit accelerator wires open.. then eng goes into self test.. and performs cylinder balance test.. accelerator pedal is last.. now you only have something like 30sec after code 10.. are you getting code 10.. ? I did not see you mention it.. good luck and let us know what you did and maybe better members then me will help you

TT_Vert · 09-18-2021, 01:47 AM

Quote:

Originally Posted by donr103

If you go to auto parts store and grab a book for 1994 f250 or f350 ford pick ups.. it's same eng and trans.. are you original owner..? And are you using ford obd1 code reader ?

No I just picked it up earlier this year. I am just jumpering STI/DLC and counting CEL flashes like the good ole EEC-IV days. I have to feel parts of this are different than the F250/F350 from research I've done. Especially given this doesn't have cats whereas the F250 and maybe F350 will.

Dave

donr103 · 09-18-2021, 02:25 AM

Book is less than 30.00 and really do yourself a favor and get one.. you might be surprised.. and sorry but I used to jumper until I found code reader for obd1 ford new less than 50.00 and does so much more.. get the one with digital read out.. I know it's hard to believe for some.. but the f53 has same light duty truck eng and trans.. as ford pickup.. no difference.. f53 is f250 or f350 with big frame on it.. there maybe a few things but it will get you 90% there.. that aside.. when was last time you changed all spark plugs and wires and cap and rotor?