Hard restart and stall when warm
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Joined: Apr 2019
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From: Carmel, IN
Hard restart and stall when warm
New to me 1996 3.0
Having an issue where the truck will start right up and run (idle stays high at times) and will drive. When shut off it will not restart without pushing the pedal up and down and takes some strategic pedal work to get started and running. It will then run high and often stall if put in gear. Eventually it will settle down and be drivable again.
I'm assuming it's idle air motor and or coolant temperature sensor...
Is this something anyone has run into before?
Having an issue where the truck will start right up and run (idle stays high at times) and will drive. When shut off it will not restart without pushing the pedal up and down and takes some strategic pedal work to get started and running. It will then run high and often stall if put in gear. Eventually it will settle down and be drivable again.
I'm assuming it's idle air motor and or coolant temperature sensor...
Is this something anyone has run into before?
The Gas pedal is actually an air pedal on fuel injected engines
When you press gas pedal down it lets more AIR into the engine, and THEN computer will calculate how much new air is coming in and add enough fuel for that new air
At no time does the gas pedal actually add gasoline to the engine, it only ever adds air
Carburetor gas pedal setup actually added gasoline directly, hence the name "gas pedal" was used for 80+ years , lol, and no need to change it now
So you need to change your diagnostics when fuel injection is involved
When you add more AIR the engine eventually starts
So that reads like engine is flooding out when it sits a short time
On a 1996 I would check the vacuum hose on the Fuel Pressure Regulator(FPR), its on the engine
Look for the two fuel lines that come up from drivers side frame rail into the engine bay
One connects to the Fuel Rail, directly, thats the IN from fuel pump/filter
The other line connects to the FPR, looks like small can, it will have a Vacuum hose attached, check that hose for gasoline, if found replace FPR, its flooding out the engine
Fuel injection computers have a Clear Flooded Engine routine, its a way to shut off the fuel injectors while cranking the engine, and very simple
Turn on the key
Press "air" pedal(LOL) down to the floor and hold it down all the way
Turn key to START
Engine should crank but NOT start, it should NOT fire at all, injectors are OFF
If it fires or starts you have fuel leaking in
Key on boots up computer
If computer "sees" WOT(wide open throttle, gas pedal down) but RPMs are at 0, it will shut off fuel injectors, this is Clear Flooded engine routine
If you release gas pedal injectors will start, if engine fires and RPMs go above 400 then injectors will start
Just FYI, I use this every morning on my HIGH mile 4.0l engine, I crank the engine over a few second to get oil pumped thru the engine before I allow it to start.
Clear flooded engine is also good for several tests of spark and fuel
When you press gas pedal down it lets more AIR into the engine, and THEN computer will calculate how much new air is coming in and add enough fuel for that new air
At no time does the gas pedal actually add gasoline to the engine, it only ever adds air
Carburetor gas pedal setup actually added gasoline directly, hence the name "gas pedal" was used for 80+ years , lol, and no need to change it now
So you need to change your diagnostics when fuel injection is involved
When you add more AIR the engine eventually starts
So that reads like engine is flooding out when it sits a short time
On a 1996 I would check the vacuum hose on the Fuel Pressure Regulator(FPR), its on the engine
Look for the two fuel lines that come up from drivers side frame rail into the engine bay
One connects to the Fuel Rail, directly, thats the IN from fuel pump/filter
The other line connects to the FPR, looks like small can, it will have a Vacuum hose attached, check that hose for gasoline, if found replace FPR, its flooding out the engine
Fuel injection computers have a Clear Flooded Engine routine, its a way to shut off the fuel injectors while cranking the engine, and very simple
Turn on the key
Press "air" pedal(LOL) down to the floor and hold it down all the way
Turn key to START
Engine should crank but NOT start, it should NOT fire at all, injectors are OFF
If it fires or starts you have fuel leaking in
Key on boots up computer
If computer "sees" WOT(wide open throttle, gas pedal down) but RPMs are at 0, it will shut off fuel injectors, this is Clear Flooded engine routine
If you release gas pedal injectors will start, if engine fires and RPMs go above 400 then injectors will start
Just FYI, I use this every morning on my HIGH mile 4.0l engine, I crank the engine over a few second to get oil pumped thru the engine before I allow it to start.
Clear flooded engine is also good for several tests of spark and fuel
Thread Starter
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Member
Joined: Apr 2019
Posts: 81
Likes: 0
From: Carmel, IN
Drove the truck home tonight. Before I did I checked the regulator hose briefly. I did not get any fuel out of it, but it had not been stated in over 24 hours. Tomorrow I will start it up and get it warm while spraying for vac leaks. After I shut it off I'll wait a few minutes and check the regulator again. I bought a new one + filter just because they're 23 years old.
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