99 4.0 4x4 won't start when its hot out.
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Joined: Oct 2022
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From: Tyler. texas
99 4.0 4x4 won't start when its hot out.
Starts fine if its cold .if I leave it in the sun then cranks but no start
Last edited by Jaxnjon63; Oct 9, 2022 at 01:34 PM. Reason: Need a little more help
Welcome to the forum
Fuel injection can't do vapor lock so that's not it, its an electrical issue of some sort
Cycle key on and off 3 times
Then try to start
Get a can of Quick Start(ether)
When you have a Crank/no start pull off a vacuum hose from intake and spray some in, put hose back
Try to start
If it fires/starts then you have a fuel delivery issue
No start, then its a Spark issue
Called 50/50 test
Watch the CEL(check engine light)
It should come on with key on, that means the Computer has powered up
It should go OFF when engine is cranking/turning, that means computer is getting a good Timing Signal from Crank sensor
Fuel injection can't do vapor lock so that's not it, its an electrical issue of some sort
Cycle key on and off 3 times
Then try to start
Get a can of Quick Start(ether)
When you have a Crank/no start pull off a vacuum hose from intake and spray some in, put hose back
Try to start
If it fires/starts then you have a fuel delivery issue
No start, then its a Spark issue
Called 50/50 test
Watch the CEL(check engine light)
It should come on with key on, that means the Computer has powered up
It should go OFF when engine is cranking/turning, that means computer is getting a good Timing Signal from Crank sensor
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