Bronco, Spout in--miss, ping, rough idle. Spout out, smooth

[mkt2488]

I have a 94 EB FSB with a 5.8. It has the all to common pinging, missing, and rough idle with the spout connector in. Pull the spout out and it runs smooth with none of the above symptoms.I have the BLACK CCD TFI. I've replaced the EEC-IV, TPS, PIP, ant TFI (used one, but advertised at good), EVR, plugs, wires, dizzy, coil, and fuel filter. I've seafoamed 3 times, cleaned the IAB, and dressed up all my grounds. All wires from the EEC-IV to the TFI, and PIP have checked good. The timing is set at 10* BTDC. I have checked the balancer timing marks against piston 1 TDC to verify that it hasn't slipped. I have routed and re-routed all my plug wires to eliminate crossfire. I know my way around electrical troubleshooting, but this is really humbling me. I have a really nice OBDI/II scanner that you plug into a laptop and watch all the sensor readings while idling or driving and record them. I have taken some recordings and have some screenshots of the data, if you'd like to check them out. Someone, please help I'm pretty sure i'm developing an ulcer due to this truck. Thanks.

 

[Skandocious]

Are you sure that you're using the correct TFI for that truck? There are 3 or 4 different types that all look VERY similar but have different internals. I'll see if I can dig up the comparison photo that I found a while back.

 

[Skandocious]

This page has the diagram I was talking about, as well as some good information about Ford TFI modules.

http://www.myo-p.com/Ford-EEC/EEC Help files/Files/TFI_grey_or_black.html

 

[blacksnapon]

TSB
98-26-2 FUEL - INFORMATION ON GASOLINE - TIPS TO RESOLVE VOLATILITY RELATED DRIVEABILITY CONCERNS

Publication Date: DECEMBER 18, 1998

FORD: 1985-1997 THUNDERBIRD
1986-1999 MUSTANG, TAURUS
1987-1999 ESCORT
1988-1994 TEMPO
1989-1997 PROBE
1990-1999 CROWN VICTORIA
1992-1993 FESTIVA
1995-1999 CONTOUR
LINCOLN-MERCURY: 1985-1997 COUGAR
1986-1992 MARK VII
1986-1999 SABLE
1987-1989 TRACER
1988-1994 TOPAZ
1988-1999 CONTINENTAL
1990-1999 GRAND MARQUIS, TOWN CAR
1991-1999 TRACER
1993-1998 MARK VIII
1995-1999 MYSTIQUE
1999 COUGAR
LIGHT TRUCK: 1986-1997 AEROSTAR
1987-1996 BRONCO
1989-1997 F SUPER DUTY, F-350
1989-1999 F-150, F-250 LD, RANGER
1991-1999 EXPLORER
1992-1999 ECONOLINE
1993-1999 VILLAGER
1995-1999 WINDSTAR
1997-1999 EXPEDITION, MOUNTAINEER
1998-1999 NAVIGATOR
1999 SUPER DUTY F SERIES
MEDIUM/HEAVY TRUCK: 1990-1997 F-700


This TSB article is being republished in its entirety to expand vehicle model coverage and revise the text.

ISSUE:
Some vehicles using winter blend fuels may exhibit a stall on start up and a no restart, hard start condition or a no start condition in unseasonably hot weather (greater than 27°C/80°F). These concerns may be related to fuel volatility from winter blend fuels during winter-spring and autumn-winter transitions and may result in a fuel pump vapor lock condition. This condition may appear to be a fuel pump failure but may be caused by winter blend fuel.

ACTION:
Refer to the following text for further information.

NOTE: FUEL TANK ADDITIVES WILL NOT RESOLVE THESE CONCERNS BECAUSE VAPOR FORMS FROM CAVITATION WITHIN THE FUEL PUMP. FILLING THE TANK TO FULL MAY BE EFFECTIVE. ADVISE CUSTOMER TO USE THE RECOMMENDED OCTANE GRADE PER OWNER MANUAL AND NOT A HIGHER GRADE.



Explain to the customer that this concern may be due to a low tank level of winter blend fuel combined with unseasonably warm weather. Advise customer that filling the fuel tank to full may be effective in resolving this concern. Also, advise customer to use the recommended octane grade per their Owner Manual and not a higher grade.


BACKGROUND

Gasolines are seasonally adjusted, meaning they have higher volatility (vaporize easier) in the winter and lower volatility in the summer. Government mandates to improve air quality have resulted in significant changes to gasolines, such as the mandatory use of oxygenates (ethanol, methyl tertiary butyl ether (MTBE), and others) in the winter or the reduction of Reid Vapor Pressure (RVP) in the summer. The addition of oxygenates (especially ethanol) increases volatility while the reduction of RVP reduces volatility.

Gasoline distribution practices often do not allow branded marketers to have much control over their gasoline's volatility other than RVP. Oxygenate (e.g., ethanol, MTBE) use is more dependent on local gasoline markets, rather than specific marketers practice. Therefore, it is difficult to recommend specific brands to avoid volatility related complaints.


OTHER APPLICABLE ARTICLES:
91-8-13

SUPERSEDES:
96-5-4

WARRANTY STATUS:
Information Only

OASIS CODES:
402000, 404000, 602300, 603300, 607000, 607400, 608000, 608400, 609000, 609400, 610000, 611000, 611500, 612000, 614000, 614500, 623000


--------------------------------------------------------------------------------

Copyright © 1998 Ford Motor Company

 

[blacksnapon]

Also, you might check the octane rod in the distributor (if it has one).

 

[mkt2488]

Are you sure that you're using the correct TFI for that truck? There are 3 or 4 different types that all look VERY similar but have different internals. I'll see if I can dig up the comparison photo that I found a while back.

i am sure on the TFI. I'm using the remote mounted computer controlled dwell (black) one. It's PN is DY1077. all of the major parts stores list the incorrect TFI for my truck, as i found from experience. I still suspect the TFI might be bad though, since I got it used (but tested) from ebay. Prolly gonna go get a new one and try that soon.

 

[mkt2488]

@BLACKSNAPON

I have been having this problem for about 3 months now (ever since i bought it). I have went through several tanks of fuel, including 87, 91 AND 93 octane fuel (to try to eliminate ping). No change in symptoms. Can you explain the octane rod to me? what exactly is it and what do i look for? thanks

 

[blacksnapon]

for a larger image, go to my gallery

 

[Skandocious]

I believe the octane rid might be part of the PIP assembly.

 

[mkt2488]

better late than never! I have a 13ish page thread on another forum that shows the whole process of fixing this issue.... spoiler alert it was the distributor.

http://www.fullsizebronco.com/forum/showthread.php?t=193312