4.0 starting issue
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Joined: Mar 2018
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From: Helper, Utah
4.0 starting issue
Hi: I have a 2003 ranger 4.0 truck will start and run great sometimes when you shut the truck off it will not restart just chugs a bit but the truck can be started on compression when getting a tow back home. Ideas?
Welcome to the forum
From the description I would say starter motor is drawing too many amps when it is hot.
You need a volt meter and a friend
Unplug the coil pack, 4 wire connector, you want a no start
Put volt meter on battery and test voltage
New battery will be 12.8volts to 13volts
3 year old battery, about 12.5v
5/6 year old battery 12.3v << time to shop for battery sale
12.2v or lower is a "done" battery
With volt meter still connected have someone crank the engine/starter, count to 5, i.e. 1 one thousand, 2 one thousand, 3 one thousand, ect...to 5
Watch volt meter, should never go below 9.8volts, repeat this two or 3 times
Do same test when vehicle is full warmed up
Voltage will normally drop to about 10v when cranking engine, this of course lower Spark voltage.
And if it get close to 9v then computer can shut down so no spark or fuel
Bump starting doesn't use the starter so voltage stays up
But really just guessing at this
From the description I would say starter motor is drawing too many amps when it is hot.
You need a volt meter and a friend
Unplug the coil pack, 4 wire connector, you want a no start
Put volt meter on battery and test voltage
New battery will be 12.8volts to 13volts
3 year old battery, about 12.5v
5/6 year old battery 12.3v << time to shop for battery sale
12.2v or lower is a "done" battery
With volt meter still connected have someone crank the engine/starter, count to 5, i.e. 1 one thousand, 2 one thousand, 3 one thousand, ect...to 5
Watch volt meter, should never go below 9.8volts, repeat this two or 3 times
Do same test when vehicle is full warmed up
Voltage will normally drop to about 10v when cranking engine, this of course lower Spark voltage.
And if it get close to 9v then computer can shut down so no spark or fuel
Bump starting doesn't use the starter so voltage stays up
But really just guessing at this
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