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1993 Ford Aerostar Misfire

Tiny
IBMTECH
  • MEMBER
  • 1993 FORD AEROSTAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 209,000 MILES
My 93 Aerostar will run fine when cold once it has warmed up it will skip on 1 cyl when you restart it. If you let cool it will start and run fine. The engine does not use oil, no smoke, no odd noises from the engine. I have done a complete tune up (wires, plugs, cap, rotor, ect) I have no check engine lights, no codes what so ever. I done a compression check all cyl have 140-145.
I'm leaning towards a fuel injector shutting down what do you think?
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Monday, November 10th, 2008 AT 8:43 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
It could be a fuel inj. Problem. Because there are no codes, we don't know what cylender is missing. I'm leaning to a weak coil.

Joe
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Thursday, November 27th, 2008 AT 10:54 PM
Tiny
IBMTECH
  • MEMBER
  • 3 POSTS
It skips on 2 cylinders 1 & 2 both on the right side. The coil has been replaced along with the Dist and module. I can get both cylinders firing on the highway with a steady throttle. I have checked the cam with a dial indicator and its well within spec's. I just ran injector cleaner and that helped. So I'm going to replace the injectors and hope for the best unless someone can enlighten me to another possible cause.
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Friday, November 28th, 2008 AT 12:52 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi:
If the compression is good and ignition is firing properly, that is the last choice. Let me know what you find.

Joe
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Friday, November 28th, 2008 AT 2:53 PM
Tiny
IBMTECH
  • MEMBER
  • 3 POSTS
Hi, I installed the new injectors and it runs great now looking at the injectors from the right bank two were caked with carbon like deposits one the tip was damaged I don't know how this happen it's the first time they have been removed. Thank you for your time!
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Saturday, November 29th, 2008 AT 3:32 PM

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