Possible fuel pump problem

[Michael_TX]

Got a '93 full-sized bronco xlt 5.0 in March was doing just fine starting up working perfect as soon as the weather started to cool and get cold I noticed when I put my bronco in reverse it would drop as if the fuel stop coming and sputter progressively got worse and shut-off completely in reverse. When temps got below 30 here in Nebraska I could not get my bronco to stay on. It fires up fine will not idle by itself (if I hit the gas while I start it up will stay on and after about 10-15 mins of this it will idle roughly by itsel) , changed out some parts fuel filter, pcv valve, spark plugs, alternator, battery etc. Now the following week temps got up to 50's and it turned on just fine like nothing was wrong worked just fine besides going into reverse next morning temps dropped into 20's or so and nothing back to being broken. Any ideas?

 

[miesk5]

yo Michael,

Welcome to da ZONE

First, check for Codes; This is adiy check by may pal Bronco Joe!

Pull Diagnostic Trouble Codes (DTCs) From your onboard computer.

Your engine and transmission are computer controlled.

The computer uses sensors to tell it a number of different things and it controls actuators that push or pull mechanical levers (kinda). If one or more sensors aren't working properly, the computer goes "blind" and doesn't know what to do. If the computer can "see" but one of the actuators is broken and therefore can't follow the commands of the computer; the engine won't run correctly. The computer is preprogrammed with set values for each of its sensors, and each of its actuators. It will run a self check of all systems, like the space shuttle; it will compare its set value(s) to the value(s) it recieves from its sensors, and actuators. If any sensor or acutator is out of the "normal" range the computer will generate a "code." It will generate some codes on the fly, and others will be stored while you are driving. There is a simple method to "pull codes" out of the computer for one to use for diagnostic purposes.

Earlier versions of On Board Diagnostics OBD 1983-1995 can flash the error code to the dash board and can be pulled in one's driveway without any special tools.

Later versions of On Board Diagnostics OBDII some 1995, and pretty much all 1996 and newer, require one to use a code reader or scanner tool.

Some auto parts stores will scan your engine codes for FREE, you may want to call around. Some will scan OBDII but not the older (prior to 1996) OBD systems.

SO here you go...

How to scan FORD on board Diagnostic Trouble Codes (DTCs) in your driveway

How To Pull Codes 1983-1995 Broncos, Mustang, F series Trucks, Econolines, 302, 351 and more @ http://broncozone.com/forums/index.php?s=&showtopic=14269&view=findpost&p=74587

do the KOEO = Key On Engine Off portion first

& Remember to have engine @ Normal Operating Temperature before doing the KEY ON ENGINE RUNNING (KOER) portion

Post any Code(s) found here by KOEO AND KOER