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95 4.3 excessive fuel consumption
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Jeff Weisbrod
New User
Oct 7, 2009, 7:29 AM
Post #1 of 7
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95 4.3 excessive fuel consumption
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I've got a 95 s-10 with a vortec 4.3, love my truck.
It started running rough and sucking up a lot of gas, actually spitting out the tail pipe. I took it into the shop and they said O-2 sensor, and replaced it, at a healthy markup. The fix didn't last long maybe 3 tanks of gas. Took it back and they said the other O2 sensor, so I replaced it, less markup. Again it started spitting gas. I got lots of different advice.
New plugs, checked for leaky vacuum, I split the manifold to see if there was a obvious issue. EGR isn't clogged and operates freely, there isn't any standing gas under the manifold. The only visual thing is the left bank is more oily looking than the right. I could take it back to the shop. Is there anything I should/could check myself before I put the parts back together?
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Jeff Norfolk
Enthusiast
Oct 7, 2009, 7:39 AM
Post #2 of 7
(5334 views)
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Re: 95 4.3 excessive fuel consumption
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Is this a Vortec motor or a Throttle body injection?
Jeff
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 7, 2009, 8:44 AM
Post #3 of 7
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Re: 95 4.3 excessive fuel consumption
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Sounds like you need a new fuel injector assembly. They are notorious for leaking under the manifold. That would explain the one clean sideof the manifold.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Jeff Weisbrod
New User
Oct 7, 2009, 8:55 AM
Post #4 of 7
(5329 views)
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Re: 95 4.3 excessive fuel consumption
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It is a Vortec, with maybe 35,000 on a replacement injector unit. The origional one leaked into the manifold pretty bad before it was replaced, that's why I thought to look.
I read a posting by strawberry about a flooding Vortec and it does look like fuel is coming out the tail pipe. After pulling a trailer for 20 mi. the front of it is splattered with black and wet.
(This post was edited by Jeff Weisbrod on Oct 7, 2009, 9:23 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 7, 2009, 9:12 AM
Post #5 of 7
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Re: 95 4.3 excessive fuel consumption
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You can use a fuel pressure gauge to determine if the pressure is holding when shut off to find out if the injector is leaking or not.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Jeff Weisbrod
New User
Oct 7, 2009, 9:29 AM
Post #6 of 7
(5318 views)
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Re: 95 4.3 excessive fuel consumption
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OK, but not to confuse, there isn't gas standing in the manifold this time, but it sure is black especially the left bank.
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 7, 2009, 9:32 AM
Post #7 of 7
(5314 views)
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Re: 95 4.3 excessive fuel consumption
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Black is good. It's the clean part that indicates fuel leak.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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