1987 Ford F-150 Ford 302 EFI Flooding

Tiny
JAKEP51
  • MEMBER
  • 1987 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 105,000 MILES
I have a problem with my truck flooding when it's cold. It will start fine but within 1-2 minuets it begins to run rough and you can tell it is getting too much fuel. If I start the truck and drive it a short distance, short enough that it isn't warm yet, and shut it off for 10 minuets, it will flood to the point where starting it is impossible. Let it sit 1.5-2 hours and it will start. Once it warms up, it doesn't flood to the point where it will stall or not start, but fuel mileage is not good. I have removed all the injectors and checked them. None seem to be leaking. Any suggestions?
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Sunday, February 8th, 2009 AT 4:37 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Does the truck have fuel injection or a carb? Also, if it's a carb, is the choke closing too far and not opening?
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Sunday, February 8th, 2009 AT 7:12 PM
Tiny
JAKEP51
  • MEMBER
No, it's multi port injection with 8 separate injectors mounted in the intake manifold. The intake plenum has a butterfly assy. For controlling air intake. I have removed all the injectors and checked them. None seem to be leaking. Any suggestions?
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Monday, February 9th, 2009 AT 5:38 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi:

It could be a temps sensor, o2 sensor, TPS, IAC. Have the computer scanned at a nationally recognized parts store. Most will do it for free. Also, make sure the catylatic converter doesn't seem plugged.
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Monday, February 9th, 2009 AT 8:47 AM
Tiny
JAKEP51
  • MEMBER
Thanks. This at least gives me a place to start. I was so sure it had to be a leaking injector dumping fuel into the system. Imagine my surprise when they all seemed ok.
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Tuesday, February 10th, 2009 AT 6:21 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi:
One step at a time. We'll get it figured out.
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Tuesday, February 10th, 2009 AT 11:32 AM
Tiny
JAKEP51
  • MEMBER
[quote="Jakep51"]

Two questions. On the temp sensor, are you referring to the one which feeds the temp gauge on the dash or a different one? And second, If the O2 sensor is causing the problem, if I disconnect it temporarily will that cause the problem to disappear? I would hope so since if it does then I would know for sure that replacing it would solve the problem before I spend the 40 bucks or so.

Thanks.
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Saturday, February 14th, 2009 AT 1:06 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Yes to the coolant sensor, and the O2 sensor may cause a different type of problem. That is why you should scan it to see if there are any codes that might identify where the problem is coming from. Like you, if I can save 40 bucks, I do my best to do so.

Let me know what you find.

Joe
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Saturday, February 14th, 2009 AT 1:30 PM
Tiny
JAKEP51
  • MEMBER
Ok the problem has been resolved. It was two fold. 1 a bad O2 sensor. And 2 that was compounded by an intermittent MAP sensor. With both replaced the truck starts and idles without loading up on fuel.
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Sunday, March 1st, 2009 AT 8:49 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
I'm glad it's fixed. Take care.
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Sunday, March 1st, 2009 AT 2:08 PM
Tiny
JAKEP51
  • MEMBER
Thanks for the help. It is greatly appreciated.
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Sunday, March 1st, 2009 AT 6:50 PM

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