88 hard to start at operating temp

[jewbacca717]

OK so my friends 88 351w will start fine when cold but let it run for 5-10 min and it wont start without turning the dizzy all the way to the left. It has a push button to start the PO put in,when the key is off and it is turned over at operating temp it turns over normal. tun the key on during this and it just sounds like the battery is dieing. I've changed the timing chain and checked the timing. the starter is new, as are all the cables and solenoid. Does anyone think it could be the egr or engine temp sensor

 

[BroncoJoe19]

Did you know that when you set the base timing that you should pull the SPOUT connector first?

 

[jewbacca717]

yes i did thanx

 

[Krafty]

sounds like a power loss between one of these areas, ignition, computer, or voltage regulator. track down the wiring schematic for the ignition circuit and try to find the power loss. I don't know what would cause the difference between hot and cold, perhaps it has something to do with a crossed wire with the electric choke, or something else temperature sensative.

 

[BroncoJoe19]

Try setting your timing to specs, (I think it is 8-10 degrees BTDC)

Then when she is hot and won't start try pulling the SPOUT connector and see if she starts.

AS I understand it the ECT does help set the timing.

Why not try pulling Diagnositc Trouble Codes?

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

Howto Pull Codes 1983-1995 Broncos, Mustang, F series Trucks, Econolines, 302, 351 and more