Question about 1998 Chevrolet Blazer

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1997 Chev Blazer 4.3L 4x4 Engine missfires on light acceleration.I have resealed the intake manifold,replaced the crank sensor,cam sensor,plugs,wires,cap,rotor.Problem slighty improves temporarily after new cap & rotor installed,but returns to poor again within 500-1000 km.

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  • ZEEK297 Mar 10, 2009

    The rough running of the 4.3 l. Blazer engine turned out to be the ignition coil.I recomend that if the regular tune up ( cap,rotor,plugs,wires ) does not give satisfactory results,replace the coil .It only cost $50 for an after market version and thats less than the cost of a cap & rotor.



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Only use ac spark plugs that should help

Posted on Oct 03, 2008

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Looks like you have a carbon deposit issue on your cylinder heads. there are two ways you can tackle this issue. you can perform sergury and remove the carbon deposits yourself either on the cylinder heads or inside the cylinders themselves. if you cannon do it, your nearby mechanic should be able to.
or you can improve the quality of gas you have in your tank by upgrading to a higher fuel grade (preferably octane 93). in addition to that you also should also add fuel additives to remove any water deposits which may also cause missfiring. after going through a couple of tanks like that you should see some improvement.
i used to have an old 92 stealth that missfired everytime i switched to a lower grade fuel after a couple of tanks. whenever i upgraded the fuel and added additives, after a couple of tanks it missfired no more. worked for me.

Posted on Sep 16, 2008


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1- a general electrical tune-up (spark plugs, wire set, cap & rotor) is a basic start to cure this issue. Wiggle the dist shaft while you are in there, if you have one.
2- Then a good carbon cleaning / throttle-body cleaning.
3- Vacuum leaks at any of the hoses that connect to the Intake manifold; especially the MAP sensor connection.
4- If that does not help then the O2 sensor could be bad or drifting.
5- Funky coil/coil-packs
6- Theoretically a microsecond glitch in either the cam or crank shaft sensors would cause this, but I am not aware of this as a typical cause.
7- Lastly a funky PCM but again it is not common for this to cause miss-firing.

Note for the V8 then also:
a) bad erg valve (this dilutes the combustion gases and hence raises the combustion temp
b) a leaky plenum/Intake manifold gasket. Leaking Intake gasket symptoms

Also can check the TSB 18-48-98 Ignition System Cross Fire/Secondary Ignition Wire Induction (Complete Version )

Hope help with this (remember rated this). Good luck and have a nice day.

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