Question about 1998 Chevrolet Blazer

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I have a 98 Chevy blazor 4.3 4x4 it has no power and sputters change fuel filter,mass air sensor,o2 sensor,plugs,wires,cap,rotor,module on desributer check fuel pump psi at 55 to 57 the only code random misfire code with old motor and new motor old one had water in 4 and 5 cylinders new motor had all new sensors put in put new relay in same and the cats hollowed out and the mufflers off to check clogs

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  • Chevrolet Master
  • 14,585 Answers

Pull the distributor. Check the gear on the bottom of it. Replace a bunch of them for wear. Causes no power and bad timing. Depending on wear. Replace the gear or the distributor.

Posted on Nov 08, 2014

  • Andrew Nov 08, 2014

    Already put new one on same thing

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Posted on Jan 02, 2017

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SOURCE: 5vz-fe misfire codes

Replace the coil pack.

Posted on Dec 26, 2008

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SOURCE: the 4runner is throwing 3

Replace the coil pack..

Posted on Dec 26, 2008

  • 1 Answer

SOURCE: 99 4runner 5vz-fe 3.4 misfire

I know this post is old, but right on the engine theres a sticker that says use multi-ground plugs only. I read a similar problem like yours and it seemed to turn out that the spark was arcing to ground over the ceramic on the plug. So maybe it could have something to do with the single ground plugs.

Posted on Jan 23, 2009

  • 33 Answers

SOURCE: I keep getting code p0420. I replaced 2 cats, all

are you running regular gas or not you should be running special unleaded fuel

Posted on Jul 01, 2009

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SOURCE: 1994 ranger misfires and sputters randomly at

check timing belt

Posted on Sep 13, 2009

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1998 chevy 1500 with 305 vortec, poor fuel milage approx 20kms/ $20.00


I averaged 9-10 MPG in my 98 w/5.7 l vortec.
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I have a 1991 chevy pick up with a 5.7l it failed the test 2


You did not post the odometer reading on the van but base on the year it should has over 85,000+ miles on it.

The most likely source of the high Hydrocarbon (HC) is clogged or drippy injectors.

Change the fuel filter if it is over 48K miles.

Ran two or more tanks full of Chevron gas will help clean out the fuel system.

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The air fuel ratio can be off is the air filter is clogged or the mass air flow sensor give incorrect data to the computer (ECU).

Change the air filter is it over 20,000 miles or you can see sunlight though it.

Use CRC Mass Air Flow cleaner or electronic part clean to gently clean the mass air flow sensor.

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Change the oil to 20W50 or one grade higher to prevent blow by.

You current motor oil is soak with HC from blow by.

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Make sure the tires are at 32 psi

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Do the smog test is a COLD morning?

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REMOVE excess cargo off the van.

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These are little things that I would do.

If the HC is still high at 25 mph then you will need a professional fuel injector cleaning or replace the injectors.


Please post more data on the third smog test on the comment window.

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