Question about 1994 Chevrolet S-10 Blazer

1 Answer

Really bad gas milage

My 94 blazer gets bad gas milage and also runs rough i put a new spider injector and the two fuel lines that plug into the spider and also a new fuel pressure regulator in it and a fuel filter still runs rough and gets bad gas milage i can smell strong gas odor sometimes but its not coming from uner the hood ? the motor only has 80k on it when it is fully warmed up it seems to have low oil pressure when ittling or in park when i push the throttle the oil pressure is normal ? could it be a cracked fuel line in the back ? or bad oil pump / oil sending unit i am about to give up on it

Posted by on

  • Anonymous Mar 21, 2014

    when I first start truck the pressure is at 0 then i give it gas and it raises up to normal after about 1min

  • Anonymous Mar 30, 2014

    seems like low pressure or a vacunm leak or maybe the fuel fillter



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 341 Answers

The 93-94-95 all have this problem ..the fuel line that come into the back do split and leak ..other problem is with vaccum lines coming off the back of intake and vacuum lines come apart from a 3 way fitting.located fire wall .when these are off will cause gas smell and bad millage .... hopes this helps...

Posted on Dec 10, 2008


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

My 94 full size blazer starts and idles fine in park and in neutral. When I put the truck in gear and hit the gas, it'll start, then act like it wants to die. The Catalytic converter is off, I'

yes try getting the fuel pump pressure tested by a mechanic. the other thing it can be is the injectors are plugged try running some lucas fuel system cleaner.

Jan 19, 2013 | Chevrolet 1500 Cars & Trucks

1 Answer

1998 chevy blazer fuel pump is putting out 55 psi but no gas is getting to the cylinders

4.3 TBI (throttle body injector) You dont have a TBI you should be equipt with a CSFI people in the field call this the spider injector,they inject fuel into tubes for each cylinder , as for the fuel pressure it should be 54 psi to 60 psi,and this is for a 4.3, The CSFI system does plug up which causes rough idle due to the poppet valve or seat,to stick open or closed,Ive ran fuel injector cleaner that has been sucesfull maybe you can try that

Nov 08, 2012 | Cars & Trucks

1 Answer

My 2002 Chevy Blazer won't start?

If you replaced the injector after the plugsthey may be fuel fouled.Pull the plugs and clean them.(you can sandblast them,or use a method I used to use-shoot a little starting fluid on them and use a lighter to burn off the contamination of too much fuel).I can't believe GM kept using this stupid design so long-I remember nearly new Vortec V6s with this same problem in the '90s.

Oct 07, 2012 | 2002 Chevrolet Blazer

1 Answer

94 cadillac eldorado fuel filter replacement

It could be a fuel problem, but in most cases the rough running would continue at road speed.
You could certainly change the fuel filter and see what happens.
A rough idle but no problems on the road would point to a vac problem or maybe a burnt valve. A fuel or ignition problem would be at most speeds including when you put the engine under a load.
Its possible to have a faulty injector on one cylinder that is bad enough to cause a miss at idle but smooth out on the road, but that is a rare occurance.

Sep 21, 2012 | 1994 Cadillac Eldorado

2 Answers

I have a 94 s10 blazer 4x4 that has the 4.3 spider injection and its not get any fuel !

So, injectors are not firing, right? Is there power on the pink injector wire? If you put an ac voltmeter on any of the injector connectors while cranking, do you see ac voltage?

Jul 31, 2017 | 1994 Chevrolet S-10

3 Answers

My Blazer on idle runs like it is missing and i smell gas at times, but while driving or above idle it runs and sounds fine until i come to a stop it idles rough again and tries to quit, so i have been...

You have a leaking injector assembly inside the intake manifold. These trucks had a very common problem with these. You'll need to buy the injector solenoid and tubes, it all comes as an assembly. The top half of the intake needs to be removed to replace it. I've attached a picture that shows the top half off and the injector tubes in question. Some people call this the injector spider as it kind of looks like one. The procedure is somewhat involved but if you google; "4.3 injectors spider repair" I'm sure you'll find many articles documenting it.0781789.jpg

Aug 09, 2010 | 1995 Chevrolet Blazer

3 Answers

4-3 vortec gas in my oil 1994 s10 blazer . vehicle was running

95% chance its the fuel injector (spider). Take the upper intake manifold off and turn the key on and off a few times and you will see fuel leaking from the spider.

Jan 28, 2009 | 1994 Chevrolet S-10 Blazer

2 Answers

How to manually get a trouble code out of a 95 blazer with vortec

The vortec motor has been known for the so caller spider assembly which is the fuel injection set up inside the intake manifold going bad.The regulator starts leaking wich puts extra fuel into the motor.If that is it you should change the whole assembly.

Nov 30, 2008 | 1995 Chevrolet Blazer

Not finding what you are looking for?
1994 Chevrolet S-10 Blazer Logo

489 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

77186 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22265 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides