slisman
Well-Known Member
- Joined
- October 24, 2016
- Messages
- 111
- Reaction score
- 37
- Location
- Poland
- City, State
- Gdańsk
- Year, Model & Trim Level
- 2000 Explorer II
Hello,
I've noticed a warm start issue with my 4.0 SOHC 2000' (returnless fuel system). It starts perfect every morning (if temperature drops under 0 degree too). It also starts just fine after all day at work (8 hours). It only has issues starting when warm (after 15 minutes or more - up to 2 hours from engine off). It is cranking for an extended period of time (5+ seconds) or needs to hold gas pedal down. No trouble codes, proper fuel pressure, truck runs smoothly and has power.
I have no idea why it only have hard starts with long cranking when the engine is warm. It fueI pressure couldnt be held by fuel pressure regulator - issue will be present on every idle I think.
I am sure that:
-fuel pump is good (tried 2 ones before this post)
-fuel lines intank are new
-fuel line to basket is not leaking (I've changed it)
-new fuel pump relay
-IAC valve is new (OEM)
-fuel and air filter are new
-sparkplugs/cables are new
Any ideas how to diagnose it - maybe via forscan or voltometer? It seems to be electric related issue. Do you think that resetting PCM and proper adjusments can make the difference?
I would appreciate any thoughts or suggestions to diagnose this issue.
I've noticed a warm start issue with my 4.0 SOHC 2000' (returnless fuel system). It starts perfect every morning (if temperature drops under 0 degree too). It also starts just fine after all day at work (8 hours). It only has issues starting when warm (after 15 minutes or more - up to 2 hours from engine off). It is cranking for an extended period of time (5+ seconds) or needs to hold gas pedal down. No trouble codes, proper fuel pressure, truck runs smoothly and has power.
I have no idea why it only have hard starts with long cranking when the engine is warm. It fueI pressure couldnt be held by fuel pressure regulator - issue will be present on every idle I think.
I am sure that:
-fuel pump is good (tried 2 ones before this post)
-fuel lines intank are new
-fuel line to basket is not leaking (I've changed it)
-new fuel pump relay
-IAC valve is new (OEM)
-fuel and air filter are new
-sparkplugs/cables are new
Any ideas how to diagnose it - maybe via forscan or voltometer? It seems to be electric related issue. Do you think that resetting PCM and proper adjusments can make the difference?
I would appreciate any thoughts or suggestions to diagnose this issue.