Question about 1995 Chevrolet Blazer

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Engine on 95 chevy blase 4.3 (orange vortec) is Idling real ruff had a compression test vacum test and pressure test ran all good changed the spider erg valve both knock sensors did a full tune up and replaced the muffler and pipes had the fuel pump checked and nothing solved the problem also the engine light is on and flashing says it has a multi mach. misfire and I can smell gas it idles hardest when sitting in drive and when you go up a hill loses power and sometimes sputs in reverse can you help me thanx

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  • Chevrolet Master
  • 17,970 Answers

Send us the fault code that you found there.

Posted on Mar 15, 2011

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1998 4x4 blazer, 4.3 vortec. Just changed out TPS and Maf, ran great, drove to store, wouldn't restart.


Have you done any testing? Engine cranking, you have spark at the plugs and fuel injector pulse? Use a gage and check proper fuel pressure, key on engine off, 60--66 psi. The spider fuel system is noted for problems.
Any applicable trouble codes?

Apr 30, 2017 | 1998 Chevrolet Blazer

1 Answer

I have a 94 s10 blazer with the 4.3 vortec the motor runs fine when its in park soon as you put it in gear it acks like it not getting gas and shuts off but you can punch it it will run till you take your...


Do you have tbi or the spider fuel system. That spider fuel system is noted for problems. Did you use a gage and check fuel pressure? For tbi it is 9--13 psi. For the spider fuel system, it is higher.
How many miles on your engine? In park or neutral, not much load on the engine. There is a load when you put it in gear. Can you do cylinder compression test to see if compression is ok? I believe the highest reading to the lowest, all should be within 75% of each other. A generic spec. Maybe a 100 psi min. spec

Nov 05, 2017 | Cars & Trucks

1 Answer

My 97 Chevy 5.7 vortec is missing on cylinders 3, 4, and 5, changed distributor cap and truck ran great for about two hours. Changed fuel filter and there was no change. New plugs and wires summer of 2012....


Well its not exactly ignition or fuel injectors, since cylinder 6 in in the firing order. 1-8-4-3-6-5-7-2
Could be something with the intake again, or the pickup in the distributor. I suppose if you have the multi-port injection inside the plenium it could be some of the spider valves or lines.
You would need to know if those cylinders are firing, and if they have normal compression.

Mar 01, 2013 | Cars & Trucks

3 Answers

My 95 blazer 4.3 will not start, it cranks, has


Try replacing the fuel filter, but it sounds like you have a weak fuel pump. Your cold start pressure should be 62-65 psi and drop about 5 psi when the engine is running. Anything less then 62 psi is going to cause you to have starting issues, you can also test your fuel pump by blocking off the return line to see if you get 75-78 PSI. this is just a test to see if your fuel pump is still good. If you have less then that with the return line blocked off, replace your fuel pump but check your ground wire first. The ground wire is separate from the wire harness and grounded to the frame and a bad ground will give you a weak pump.
Thank you for using Fixya and good luck

Mar 20, 2010 | 1994 Chevrolet S-10 Blazer

1 Answer

93' chevy 4.3 V6 vortec. engine problem


fuel lines inside the intake plhenum may be cracked and leaking inside the plhenum. same thing happened to my 1992.sonoma. they are made of a plastic material and tend to crack right in the bend of these lines.

Mar 18, 2010 | Chevrolet S 10 Cars & Trucks

1 Answer

95 chevy Z-71 no power done a complete tune up still no power acts like a carb engine warming up


Have you done a compression test ?, checked timing ? Changed fuel filter, ran pressure test on fuel system ?

Feb 04, 2010 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

I have a 96 chevy blazer with a 4.3 vortec rough


Do a compression test on all of your cylinders when it is cold. Backfiring is a sign of a worn valve seat allowing mixed fuel and air (lit by spark) to be forced back into the intake. You will probably see compression loss on one or more cylinders.

Also... there is a chance that the EGR valve is not totally seated when the engine is cold with just a small blow by. The EGR valve seats coke up over time with black gunk.

Jan 28, 2010 | 1996 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

90 chevy cuts off and idles up and down


Sounds like their is to much air getting to the engine. This is caused by an air leak in the vacume lines. Try replacing all the vacume lines on the engine.

If you have the vortec motor they are notorious for the fuel pressure regulator failing. Have the fuel pressure tested at the fuel rail. If it is below or at 56 the engine will have hesitation or rough odle and no power.

Please contact me if your problem presists.

Thanks, Charlie

Jan 30, 2009 | 1985 Chevrolet Chevy

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