Fuel/Ignition Issue?

[11211Bronco]

Good afternoon,

This is my first post. I'm having issues with my 1994 Bronco XLT. The truck had been stalling out on me from time to time-it was as if fuel wasn't gettin to the motor. I had my mechanic replace the fuel pump and the ignition module last week and everything seemed just fine. Last night after driving in traffic for 40 minutes she stalled out again. I let her sit for 2 hours and she fired right back up again. This morning she fired right up again with no problem. I dropped her off at the mechanic this morning. I'm looking for any advise I can give the guy in terms of what to look for next. I should mention that the cab has been smelling like gas recently i've noticed. I appreciate any help at all.

Thanks.

 

[miesk5]

yo, Welcome to the Zone!

I think you need to find a new mechanic. He shouldn't have replaced those parts unless he knew it was the real issue.

Do a self test for Codes;

by my buddy here, BroncoJoe!

http://broncozone.com/topic/14269-code-reader/page__pid__74587__mode__threaded

important noted from Joe's diy article;

Run it around to heat the engine up and shift thru all gears incl Reverse. Then turn off all accessories/lights, etc.

Make sure A/C is off and transmission is in Park (automatic) or in Neutral for a Manual & release clutch

There are two types of EEC Self-Tests, Key On Engine Off (KOEO) & Key On Engine Running (KOER).

The engine temperature must be greater than 50°F (10°C) to pass the KOEO Self-Test and greater than 180°F (82°C) to pass the KOER Self-Test.

Post Codes here or look em up in my site using da SEARCH feature.. some Codes will be repeated a lot bec. they are used in different sections of my site... type ia code number such as 123

Remember that a code comes up for say.. DTC 87 FP relay circuit failure; may not be the relay itself..suspect inertia switch, fusible link, FP relay or socket corrosion, etc. so save $ on parts replacement for now untilcodes are checked and analyzed.

--

Next is, did he test fuel pressure?

the 5.0L, 5.8L and 7.5L EFI engines in-tank mounted high pressure fuel pump is capable of supplying 105 liters (27.7 gallons) of fuel per hour at a working pressure of 270.0 kPa (39 psi).

Pressure During KOER Self Test; 4.9 (45-60 PSI), 5.0 (30-45 PSI), 5.8 (30-45 PSI) & 7.5 (30-45 PSI); read more for KOEO PSI Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net



see diagram on how to run fuel pump using same DLC connector that BroncoJoe describes in that self test for Codes.

here it is



Connect FP Relay (terminal A) to any ground to force the fuel pump(s) on when the key is in RUN.

read and see how to Test pressure at the fuel rail with a gauge



and



--

GL!

 

[96Bronco177k]

11211 Bronco:

Follow Miesk's advice and check your fuel pressure. Based on what you said about the stall problem, it sounds like a fuel pump(quit after getting warm/hot), but you said the mechanic replaced it. If no codes after the KEOR and KOEO tests, don't chase ghosts.

Read this write up:

http://www.helium.com/items/1357860-how-do-you-know-when-a-fuel-pump-is-going-bad

I had a ridiculous time with my 96 trying to trace the stall problem:

http://broncozone.com/topic/21304-bucking-bronco-unpredicatable-stalling/page__st__60__gopid__112778entry112778

Hope you get it figured out quick.

 

[11211Bronco]

Thanks alot yall for the information. I'll get started on this and keep you updated. Again, thank you very much.