Hard starting when warm
New User
Joined: Oct 1999
Posts: 21
Likes: 0
From: Cinnaminson USA
Hard starting when warm
I have an 85 Bronco with a 302 EFI, it starts fine when cold but when I try to start it after it's warmed up it takes a couple of tries to get going. The truck runs good, never stalls, just hard to start warm.
Any ideas?
Bill
Any ideas?
Bill
Posting Guru
Joined: Jul 2002
Posts: 2,205
Likes: 1
From: Vancouver WA
Hard starting when warm
Does the engine turn over slowly when it's warm, or does it crank at "normal" speed and just not want to start?
If it cranks slow, it could be the starter. Old starter + heat = slow cranking.
If it cranks slow, it could be the starter. Old starter + heat = slow cranking.
New User
Joined: Oct 1999
Posts: 21
Likes: 0
From: Cinnaminson USA
Hard starting when warm
It cranks at normal speed and does not want to start, only does this when it is warm, it takes 3 or 4 tries to start, when the engine is cold it will start on the first try.
Laughing Gas
Joined: Jul 2001
Posts: 1,019
Likes: 3
From: Bismarck, ND
Hard starting when warm
Wildbill:
More than likely, you have a fuel pump and/or fuel pressure regulator going bad. Try this: the next time your truck is warmed up, and you expect it to give you a hard time in starting, cycle the key to the "on" position (do not crank the engine). Turn it off. Cycle it back to "on" (still don't crank the engine). Turn it off. Cycle it on again, this time cranking the engine. If it starts right up, you're having a fuel pressure problem (Cycling the key on and off runs the pump several times, building up pressure in the lines to allow the quick start. If you had good pressure to start with, the second or so of the key being in the "on" position before you'd normally crank it would be sufficient.) If this doesn't make any difference, try to watch your tailpipe when the truck does fire. If it kicks out a puff of black smoke after it finally does start, suspect your ignition coil or possibly your ignition control module (they could be going bad, with the engine heat soak causing a failure when warm). Hope this helps!
More than likely, you have a fuel pump and/or fuel pressure regulator going bad. Try this: the next time your truck is warmed up, and you expect it to give you a hard time in starting, cycle the key to the "on" position (do not crank the engine). Turn it off. Cycle it back to "on" (still don't crank the engine). Turn it off. Cycle it on again, this time cranking the engine. If it starts right up, you're having a fuel pressure problem (Cycling the key on and off runs the pump several times, building up pressure in the lines to allow the quick start. If you had good pressure to start with, the second or so of the key being in the "on" position before you'd normally crank it would be sufficient.) If this doesn't make any difference, try to watch your tailpipe when the truck does fire. If it kicks out a puff of black smoke after it finally does start, suspect your ignition coil or possibly your ignition control module (they could be going bad, with the engine heat soak causing a failure when warm). Hope this helps!
