Question about 2000 Chevrolet Impala

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How do i know if i need to replace the fuel injector or the egr valve on a 4.3l vortec in a 96 blazer?

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I would do a fuel pressure test

Posted on Aug 29, 2008

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Have a 94 chevy blazer 4x4 with vortec eng. can keep it running it is getting spark and gas will start but only runs for a moment then shuts ofc, i have replaced the starter, plugs wires, cap and roter,...


Sounds like it could be the EGR Valve.If you can drive it and get up to 45-55 mph and it runs smooth then its the EGR valve that is stuck in the open position.I would take the EGR Valve off and clean the carbon out of it using a non-chlronated brake cleaner.

Jan 27, 2012 | Saturn L-Series Cars & Trucks

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I have a 1993 chevy blazer with the 4.3 vortec and when I start driving it looses power when I hit second gear starts jumping and acting like its gonna stall how do I fix this


if mtr is missfiring u may need 2 go through the ingnition system ie spark plugs leads/dizzy cap/rotorarm its also a good idear 2 replace the fuel & air filters or get it 2 a mechanic & have it run up on a tune scope.

Sep 10, 2011 | 1993 Chevrolet S-10 Blazer

2 Answers

1997 Blazer 4.3 has a DTC P0300 only can be driven after warm up,but still misses most of the time. it passed E check when not missing and idle is smooth. have replaced all ignation parts. the EGR valve...


this code indicates multiple miss fire,which is not just one cylinder doing it.if this motor has a vortec motor in it the problem could be the injectors not operating properly or the lines to the injectors may be leaking into the intake causing a rich condition.it could be the egr valve stuck open just a bit causing a vacume leak and rough running.it could even be a problem with the pickup coil in the distributer or a cracked magnet.the ignition module could also cause the problem.

Jun 24, 2011 | 1997 Chevrolet Blazer

2 Answers

95 check s-10 blazer idle is not consistent: almost stalls then idle surges. When gas is applied the engine bucks & misses severely. A friend has suggested it may be the egr valve. What are the...


An EGR that is stuck opencan very well cause the symptom you are decribing, including surging at idle and poor acceleration.

Failure of GM EGR Valves is quite rare.
A common problem on the 4.3L Vortec engines is failure of the Central Multiport Injection Assembly located between the plastic upper intake plenum and the lower intake manifold.

Sometimes failure of injector lines and/or the fuel pressure regulator (Part of the MFI Assembly) will cause fuel to spill into the upper plenum area. This can dislodge carbon deposits in the upper plenum which then get stuck in the EGR Valve and cause the symptoms that you are describing. The EGR Valve can be removed and cleaned. Replacement is not usually necessary.
Ido recommend replacement of the injector assembly however.

check out this solution page for more info regarding this.

http://www.fixya.com/cars/t3218505-misfire_code_rough_idle_full_tune_up

Dec 04, 2010 | 1995 Chevrolet Blazer

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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

2 Answers

95 4.3ltr.vortec, 195,000 miles.idles ruff, will stall if you stop hard, and has heavy smell of gas right after fill up. replaced egr valve, ran well for 2wks. now problem has retuned. does great on open...


Try Changing out the Fuel Regulator! if that doesnt work then it probably is the Injectors, i have the same issue except now im getting fuel in my oil i got told to try checking the evaporator canister valve! so try that to if its open close it!

Jul 17, 2009 | 1994 Chevrolet S-10 Blazer

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I have a chevy blazer 94 S10 still quit on the road.


How is it running before it quits onyou. This could be the culprit of an egr valve. How many miles on thevehicle. The egr seems to die on a certain mileage pattern. Also youcould start by cleaning the egr valve before replacing it. This couldvery well help the situation, but this is just a guess. Hope thishelps!!

Apr 30, 2009 | 1994 Chevrolet S-10 Blazer

1 Answer

1999 chevy blazer wont start


THE FUEL PUMP IS BAD.

if your losing fuel pressure after the pump runs the drain back valve in the pump has failed.

and i doubt that you are seeing enough fuel pressure to run a vortec engine.

low fuel pressure equals a non running vortec

Apr 11, 2009 | 1999 Chevrolet Blazer

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