Fox Raw fuel in intake

Scottybronco · Aug 13, 2019

So brand new engine with a trick flow upper and lower intake and I qne to remove the valve covers to do a valve adjustment and I noticed there is raw fuel in all the runners on the lower... I'm pretty sure its fuel anyway not sure what other liquid it would be... any idea what would cause this? Its does not idle when cold but it has a cam and 30lb injectors ect 76 cl ect and I havent turned the computer yet

Any help.would be greatly appriciated

Thanks in advance

TOOLOW91 · Aug 13, 2019

Scottybronco said:
So brand new engine with a trick flow upper and lower intake and I qne to remove the valve covers to do a valve adjustment and I noticed there is raw fuel in all the runners on the lower... I'm pretty sure its fuel anyway not sure what other liquid it would be... any idea what would cause this? Its does not idle when cold but it has a cam and 30lb injectors ect 76 cl ect and I havent turned the computer yet

Any help.would be greatly appriciated

Thanks in advance

You sort of answered your own question . You have a meter that is sub par and the ecu is not happy with the big injectors . It’s super rich becareful not to wash down the cyl like that . Spary pattern on the injectors could suck too they may need to be flower and cleaned .

Scottybronco · Aug 13, 2019

TOOLOW91 said:
You sort of answered your own question . You have a meter that is sub par and the ecu is not happy with the big injectors . It’s super rich becareful not to wash down the cyl like that . Spary pattern on the injectors could suck too they may need to be flower and cleaned .

I suspected that problem but the plugs seems to show quite a nice burn .... no black no soot. But either way I'll have the computer retu ed and go from there

TOOLOW91 · Aug 13, 2019

Scottybronco said:
I suspected that problem but the plugs seems to show quite a nice burn .... no black no soot. But either way I'll have the computer retu ed and go from there

That’s interesting . You are getting tuned but that meter is just not a favorite of mine . ( yes I owned one ) Pro m is really the way to go for a mass air meter .

Scottybronco · Aug 13, 2019

Yea it's been nothing but problems honestly slight miss and very low cruise ner idled worth a maybe I'll spring for a pro m thanks for the advice

jrichker · Aug 14, 2019

If the fuel pressure diaphragm leaks, it will allow fuel to be sucked into the intake manifold through the vacuum line that attaches to the upper intake manifold.

The following are diagrams courtesy of Tmoss & Stang&2birds

Vacuum diagram 89-93 Mustangs

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring; http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.

TFI module wiring for 94-95 Mustang GT
http://www.veryuseful.com/mustang/tech/engine/images/Mustang-94-95-IgnitionControlModule.gif

Complete computer, actuator & sensor wiring diagram for 94-95 Mustangs

http://www.veryuseful.com/mustang/tech/engine/images/94-95_5.0_EEC_Wiring_Diagram.gif

Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs

http://www.veryuseful.com/mustang/tech/engine/images/91-93_5.0_EEC_Wiring_Diagram.gif

Complete computer, actuator & sensor wiring diagram for 88-90 Mass Air Mustangs

http://www.veryuseful.com/mustang/tech/engine/images/88-91_5.0_EEC_Wiring_Diagram.gif

Ignition switch wiring

http://www.veryuseful.com/mustang/tech/engine/images/IgnitionSwitchWiring.gif

Fuel, alternator, A/C and ignition wiring

http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

O2 sensor wiring harness

http://www.veryuseful.com/mustang/tech/engine/images/mustangO2Harness.gif

Vacuum diagram 89-93 Mustangs

http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxFordVacuumDiagram.jpg

HVAC vacuum diagram

http://www.veryuseful.com/mustang/tech/engine/images/Mustang_AC_heat_vacuum_controls.gif

TFI module differences & pin out

http://www.veryuseful.com/mustang/tech/engine/images/TFI_5.0_comparison.gif

Fuse box layout

http://www.veryuseful.com/mustang/tech/engine/images/MustangFuseBox.gif

Mustang 5.0 Lights and Radio schematic, by TMoss:
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxLights-Radio_diag.gif

87-92 power window wiring

http://www.veryuseful.com/mustang/tech/engine/images/mustang87-92%20PowerWindowWiring.gif

93 power window wiring

http://www.veryuseful.com/mustang/tech/engine/images/mustang93PowerWindows.gif

T5 Cutaway showing T5 internal parts

http://www.veryuseful.com/mustang/tech/engine/images/5_Speed_Cutaway_Illustrated.jpg

Visual comparison of the Ford Fuel Injectors, picture by TMoss:

http://www.veryuseful.com/mustang/tech/engine/images/Ford_Injector_Guide.jpg

Convertible top motor wiring http://www.veryuseful.com/mustang/tech/engine/images/mustang88VertTopMotorCkt.gif

Engine mounted fuel injector harness

http://www.veryuseful.com/mustang/tech/engine/images/mustangEngineHarness.gif

Location of the TPS, IAB, and the 10-pin connectors on a 5.0, picture by TMoss:

http://www.veryuseful.com/mustang/tech/engine/images/TPS_IAB_Pic.jpg

Starter circuit

http://forums.stangnet.com/attachment.php?attachmentid=21328&d=1080916057

Alternator diagram for 94-95 Mustangs.

http://www.veryuseful.com/mustang/tech/engine/images/Mustang-94-95-Alt.gif

Scottybronco · Aug 14, 2019

Thank you for all this information! I really appriciate ut

Boostedpimp · Aug 14, 2019

As much as I hate the cl meters I wouldn't blame the tune completely. To have that much fuel i'd look at the fuel pressure regulator and verify the diaphragm isn't bad in it. Also i've had a few pmas meters over the years and have great results with them. I've replaced bbk and older pro m meters with them for half the cost

MH80B-30CA 80mm Housing w/Tuned MAF - 30lb Stock Injectors w/Cold Air Intake - Black - PMAS MAF

Our PMAS Black MAF is a direct bolt-on replacement for Ford vehicles using a 55mm un-flanged MAF stock. With Aftermarket Cold Air Intake. 88-93 Mustang FB 5.0L

www.pmas-maf.com

Fox Raw fuel in intake

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MH80B-30CA 80mm Housing w/Tuned MAF - 30lb Stock Injectors w/Cold Air Intake - Black - PMAS MAF

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Fox Raw fuel in intake

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