yo 1987BroncoProject,
As BOB Advised so well!
LEAK DETECTION
Fluorescent Leak Detection
Employs an ultraviolet or UV/blue light inspection lamp and fluorescent dyes to find even the smallest leaks quickly and easily. It locates multiple leaks and those not found by any other method. Its lack of disadvantages explains why it is the most popular leak detection technique. In addition to diagnostics, it is the only preventive/programmed maintenance method that detects all refrigerant and fluid leaks.
Visual Inspection
This labor-intensive procedure is very time-consuming except for the largest, most obvious leaks. Some people lay newspaper down to try to locate the general area of the leak. They will check the color of the fluid to try to identify what system it is coming from, i.e., red for transmission fluid, green for coolant or orange, etc. However, it’s often difficult to pinpoint the exact source. Cannot be used for refrigerant leaks or for small leaks which evaporate right away. It’s difficult to detect clear liquids.
Soapy Water and Bubble Solutions
Although it’s inexpensive, this method has a number of serious drawbacks. In addition to being very time-consuming, it is not applicable to oil, hydraulics, transmissions and fuel. Only for refrigerant leaks.
Talcum Powder
Spraying foot powder on and around a suspect area may help you to find the leak if you’re lucky. But don’t run the engine, or you’ll make a real mess. This powder can also foul up carburetors. Only for oil leaks. I used to remove fan and run engine to find leak(s) source(s); stoppping eng when it reached norm op temp; best done in cold weather
Ion Detector ("Sniffer")
Detects only the general area of a refrigerant leak, not the exact location.This fragile device does not withstand hard use. In addition, it does not operate well in humid conditions. Only for refrigerant leaks.
Compressed Air
Used in water-cooling systems, it can damage hoses, radiators, and other components. It can actually cause additional leaks and enlarge existing ones. Only for coolant leaks. or get a pressure tester from local parts store loan a tool program; see my broncolinks.com site under ZZEngine, Cooling for LINKs such as at
http://www.aa1car.com/library/coolant_leaks.htm
Identification; E4OD, AOD & C6 Pan Identification & Driver Side pics by Kenneth. Shift Indicator Patterns & Indicator pics (AOD, C6 & E4OD); AOD have 14 pan bolts, P-R-N-(D)-D-1 shifter pattern, note, OD is actually a (D) - pic by trigger; C6 have 17 pan bolts, P-R-N-D-2-1, shifter pattern - pic by miesk5; E4OD have 20 pan bolts; P-R-N-D-2-1 shifter pattern - pic by Chris A.
Source: by Chris A (blueoval78), trigger & miesk5 via miesk5 at Ford Bronco Zone Forums
http://broncozone.com/topic/22732-1990-bronco-351/
Guessing it is an AOD
Trouble Shooting, COMPREHENSIVE; "...from the AOD service manual..."
Source: by duanemyhre at
http://www.sccoa.com/forums/showthread.php?t=30511
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SELF TEST COMPREHENSIVE & Connector Location pics, Bronco & Ford; "...The self-test plugs were mounted on the passenger side fender on 1985-86 EFI trucks; The self-test plugs are located along the driver's side fender behind the air filter box on 87-95 EFI trucks..."; miesk5 NOTE; Self-Test Input (STI) is the Pin in the Lt gray Connector and Signal Return Ground (STO/SIGRET) is Pin E in black Connector in 87-95; 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. Run it around to heat the engine up and shift thru all gears incl Reverse. Then turn off all accesories/lights, etc. Make sure A/C is off and transmission is in Park (automatic) or in Neutral for a Manual & release clutch. Do Key On Engine Off (KOEO) portion first. Fix any codes from the KOEO test before you do the running test (KOER, key on, engine running). Look Codes up in my broncolinks.com site using the new Search function. .; miesk5 Note; Steve83 advises; "...If the CEL is burned out, connect CEL © to a 12V test light, and the light's other terminal to a 12V source on the same vehicle..." MIESK5 NOTE; C199 Self-Test Input (STI) (Gray) & C198 Diagnostic Link Connector (DLC) (Black)
Source: by BroncoJoe19 (Joe) at Ford Bronco Zone Forums
http://broncozone.com/topic/14269-code-reader/
post Code(s) found by KOEO & KOER