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Whne I start my truck it runs a little rough and when I press on the gas pedal it dies what would cause this?

Tiny
MATHEW_S
  • MEMBER
  • 1987 FORD RANGER
  • 150,000 MILES
I have checked all the fuel pumps, the filter, fuel pressure regulator and they are all working but the minute I press on the gas it dies. If I hold the gas pedal down it starts to back fire really bad.
Friday, October 28th, 2011 AT 12:20 AM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,117 POSTS
Check for a vacuum leak and make sure the catalytic converter isn't plugged.
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Friday, October 28th, 2011 AT 12:39 AM
Tiny
MATHEW_S
  • MEMBER
  • 5 POSTS
I checked for vacuum leaks and didnt find any and my truck doesnt have a catalytic converter it was removed cause it was plugged also I have an oil substance coming from my exhaust at the tail pipe and where the exhaust connects to the muffler.
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Friday, October 28th, 2011 AT 2:13 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,117 POSTS
It is black and water like?
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Friday, October 28th, 2011 AT 3:58 AM
Tiny
MATHEW_S
  • MEMBER
  • 5 POSTS
Yes its black and kind of water like.
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Saturday, October 29th, 2011 AT 8:58 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,117 POSTS
That is most likely condensation mixing with carbon in the exhaust. Not a concern
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Monday, October 31st, 2011 AT 4:29 AM
Tiny
MATHEW_S
  • MEMBER
  • 5 POSTS
Well I am at my wits end with this truck I checked everything on it yesterday and still nothing. For some reason when I give it gas it just dies.
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Monday, October 31st, 2011 AT 5:13 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,117 POSTS
It sounds like a throttle position sensor or a major vacuum leak. Check vacuum at the intake. It should be around 17.
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Monday, October 31st, 2011 AT 7:14 PM
Tiny
MATHEW_S
  • MEMBER
  • 5 POSTS
17? YYou have to forgive me I'm vehicle illiterate what do you mean around 17?
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Monday, October 31st, 2011 AT 7:24 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,117 POSTS
Inch pounds of vacuum.
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Monday, October 31st, 2011 AT 8:40 PM

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