Does anyone have access to a schematic of the ignition control box for a 1987 1/2 ton 2wd 318 CID? I've got a student that has a no start condition that seems to be electrical in nature (possible rodent damage) and a schematic would really help.
Thanks,
David Pershing
Speed Dragon
12-01-2005, 08:23 PM
Is it carbed or TBI? Probably a Haynes repair manual should have it, or better yet, a factory service manual, they're kinda expensive though. Chump may have a schematic he can post though.
Chump
12-01-2005, 10:30 PM
Is this the computer you are talking about? If so make sure the 10 and 14 pin connectors are making good connections, the female terminals will sometimes spread open, pin 5 especially. Also that computer is known to cause alot of problems. Are you looking for wiring diagrams to fix some chewed through wires or to diagnose the no-start condition?
I'm trying to help him diagnose a no-start condition. So far he's got no power coming to the coil. The truck is carbbed and he is getting fuel to the plugs. The truck ran when he parked it with clutch problems, but now he has someone that wants to buy it so now it won't start.
He parked it in an old barn and around here that means mice and wood rats. I'm only assuming that there may be wiring damage since I have not actually seen the vehicle.
I try my best to help him - after all he is a Ford guy and feels a bit lost around a Dodge. :crazy:
David Pershing
pershingd
12-02-2005, 09:10 AM
Final Update - Rodent Damage!
Something chewed through the wiring to the distributor. A few hours of looking and a few minutes of repair and it fired right up.
Thanks everyone for all your help.
David Pershing
Chump
12-02-2005, 02:01 PM
Final Update - Rodent Damage!
Something chewed through the wiring to the distributor. A few hours of looking and a few minutes of repair and it fired right up.
Thanks everyone for all your help.
David Pershing
Boy am I glad to hear that! this is one of the most pain in the rear systems to check out. I was just gonna get you started in No-Start Diagnostics an a couple of voltage checks at the computer. Good work!
No-Start Testing
. Diagnostic Notes (Read Before Proceding)
. No Start (NS) Tests
. . 1 Checking For Spark at Spark Plug Wires
. . 2A Checking For Fuel In Carburetor
. . 3A Checking For Fuel Fouled Spark Plugs
. . 4A Checking Engine Crank Timing
. . 4B Checking Engine Timing
. . 5A Check For Spark at Ignition Coil Wire
. . 5B Checking Ignition Coil Wire
. . 6A Checking System For Fault Codes
. . 6B Resistance of Ignition Coil Primary Windings
. . 6C Resistance of Ignition Coil Secondary Windings
. . 6D Ignition Primary Circuit to Computer
. . 6E Distribution Dual Pickup Circuit
. . 6F Resistance of DIST. Single Pickup Coil
. . 6G Resistance of DIST. Pickup Coil Wires
. . 6H Voltage Supply to Computer
. . 6I Continuity/Resistance of Computer Ground
. . 7A Fuel Pump Pressure at Carburetor
. . 7B Fuel Pressure Before Fuel Filter
. . 7C Checking Fuel Pump Vacuum
pershingd
12-02-2005, 02:15 PM
I've never owned one of that generation, but I know a few people that were so sick of fighting with it they ripped it out entirely and retrofitted a mid-70's electronic ignition system into it.
