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Why does my truck start hard, either cranks for a long time or stumbles over itself

Tiny
96FORDBRONCO
  • MEMBER
  • 1996 FORD BRONCO
  • 133,000 MILES
If it sits all night and I go to start it in the morning it starts. Ok kinda sputters though. If I let it warm up then shut it off and start it back up it starts good, but if I shut it off after its warm and wait at least an hour before starting it will crank for about 5 seconds then slowly start. Also it has a very slight miss at idle I can feel it in my seat. I have already replaced, IAC, FPR TPS, MAF, ICM, EGR valve and sensor, plugs, wires, cap, rotor, coil, air filter, fuel pump relay, pump has 40psi so its good, new oem injectors, cleaned intake, alternator and battery are good, as good compression and there aren't any codes.
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Monday, November 14th, 2011 AT 10:49 PM

6 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Check to see if you are getting a good hot blue snapping spark to the plugs. Also, check for fuel pressure drop off. In other words, does the fuel system maintain fuel pressure with the engine off or does it drop to 0 PSI?
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Monday, November 14th, 2011 AT 11:24 PM
Tiny
96FORDBRONCO
  • MEMBER
  • 4 POSTS
After you turn the truck off it drops to about 30 psi
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Monday, November 14th, 2011 AT 11:47 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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That is fine.
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Tuesday, November 15th, 2011 AT 12:06 AM
Tiny
96FORDBRONCO
  • MEMBER
  • 4 POSTS
Ok so say it is getting good spark, what else could it possibly be
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Tuesday, November 15th, 2011 AT 12:21 AM
Tiny
96FORDBRONCO
  • MEMBER
  • 4 POSTS
So say it is getting good spark, what else could it possibly be
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Tuesday, November 15th, 2011 AT 12:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
If you have good fuel pressure and good spark, it could be low compression or dirty injectors.
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Tuesday, November 15th, 2011 AT 1:25 AM

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