Question about 1995 Chevrolet Blazer

1 Answer

Service Engine Soon Light and Rough Idle (Below 1200 rpms)

My 1995 Chevrolet Blazer 4.3 Vortec has had this problem for the past couple of months. I have replaced the fuel pump, fuel filter, spider fuel injection system (CMFI), rotor button, distributor cap, wires, plugs, PCV vent, checked for vacuum leaks, checked for upper intake manifold leak, installed internal fuel lines, replaced the MAP sensors, and the problem still exists.

Can someone please help??

Posted by on

  • Anonymous Feb 12, 2009

    all the same problems



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
  • 599 Answers

Do you get check engine codes?..have you done a leak down test and compression test to determine mechanical engine health?

Posted on Oct 07, 2008

  • Steven C Wilson
    Steven C Wilson Jan 19, 2014

    I have the same problem and we are getting engine codes. The codes indicated problems with the Map sensor, TPS or EGR sensor.

  • Steven C Wilson
    Steven C Wilson Jan 19, 2014

    We have done a compression test and it checked out fine. I am not sure what a 'leak down test' is.



1 Suggested Answer



Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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 repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

2 Answers

Our fuel pump stopped working on our 98 Chevy Blazer V6 4.3L Vortec Engine, so we bought a new one. A couple days later (before replacing the fuel pump) it started up and ran but ran crappy. So we did

what did you do (replace it) if you still have a miss you may need to tune it up / make sure the fuel pump you bought is for the right psi for your blazer

Mar 27, 2013 | 1998 Chevrolet Blazer

1 Answer

1995 s-10 blazer 4.3 vortec wont start. have 57 psi at intake. wont fire with eather, new gm spider. advance auto fuel pump. filter.

well if the spyder is installed correctly, and will hold at least 45PSI, then it sounds like an ignition problem, make sure it has fire at all cyl's. I would check and make sure all injectors have a good pulse signal, and double check the ignition system.

Jan 28, 2011 | 1996 Chevrolet Blazer

1 Answer

95 blazer not getting fuel new tank,sending unit/pump, relay. has 4.3l cpi vortec engine

Is the fuel pump actually working and if so, how far is the fuel going, is it stopping at the filter, or is it going all the way to the injector?

Jan 28, 2011 | 1995 Chevrolet Blazer

2 Answers

95 chevy blazer vortec 4.3 changed fuel pump 2 days later it started to bog and sputter when giving gas change fuel regulator dont see any leaks or spray from the spider or the in lines they were replaced...

Check for a fuel filter problem..... sometimes the newer fuel pump can **** up debri from the bottom of fuel tanks that the old pump did not have the flow to **** up.

Jan 16, 2011 | 1995 Chevrolet Blazer

3 Answers

Know if my 95 chevy blazer has a spider CPI?

A spider injector is located underneath the intake plenum and this is multi-port. Otherwise you have a throttle body injector system. Vortec engines have spider injectors and they are super expensive to replace ($400.00- 850.00) each ! There is only one spider injector for each engine it has 6 legs/fuel tubes that go to each cylinder.

Oct 10, 2009 | 1995 Chevrolet Blazer

1 Answer

1998 blazer will not start

there is a tube system on the vortec under the mainfold the delivers the fuel called the spider and these are known to start leaking on higher mile engines, if there is any fuel in the engine oil you need to fix asap or bearings will get ruined and engine will be needing rebuild.

Aug 16, 2009 | 1998 Chevrolet Blazer

2 Answers

95 blazer with vortec spark is fine fuel is not

you have to put a guage on it to find out the pressure it may kick on but not enough pressure

Apr 17, 2009 | 1995 Chevrolet Blazer

Not finding what you are looking for?
Cars & Trucks Logo

683 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

85223 Answers

Jonah Oneal

Level 3 Expert

14092 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

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

Answer questions

Manuals & User Guides