99ta Posted April 7, 2007 Report Share Posted April 7, 2007 93 s10 4.3l started running very rough this morning. Shakes really bad at idle and all the time for that matter. My intial thought was a spark plug wire had come off. Checked all those and they were fine. Should I start with changing all the plugs and wires? or try something else? any input would help. Thanks Eric Quote Link to comment Share on other sites More sharing options...
Boost-n-Juice Posted April 7, 2007 Report Share Posted April 7, 2007 Sparkplugs usually tell the story. Before you take them out you could try taking one wire off at a time and see if it changes the way it runs, then put that wire back on and go to the next. Quote Link to comment Share on other sites More sharing options...
Clifford Automotive Posted April 7, 2007 Report Share Posted April 7, 2007 Throw a set of plugs in it. Quote Link to comment Share on other sites More sharing options...
yellowsnake Posted April 8, 2007 Report Share Posted April 8, 2007 sell me the truck for a very low price Quote Link to comment Share on other sites More sharing options...
Guest 78novaman Posted April 8, 2007 Report Share Posted April 8, 2007 How many miles? The HEI loves to die at 120,000-150,000mi Quote Link to comment Share on other sites More sharing options...
99ta Posted April 8, 2007 Author Report Share Posted April 8, 2007 237,000...........what is this this HEI you speak of? Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted April 9, 2007 Report Share Posted April 9, 2007 8th digit of the VIN a W or a Z? Quote Link to comment Share on other sites More sharing options...
lawnman Posted April 9, 2007 Report Share Posted April 9, 2007 I have a 95 5.0L Chevy truck. It acts the exact same way. I have changed the plugs, wires, dist. cap, and rotor, even replaced the fuel filter. The # 1 plug corroded after 4-5 000 miles. I am thinking valves? What do you guys think? I should say my truck has 175,000 miles on it , all from pulling a tandem axle landscaping trailer or plowing snow everyday of it's life. Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted April 9, 2007 Report Share Posted April 9, 2007 it could be any number of things like control mudule, magnetic pickup, vacum leak etc his particular blazer depending on wich vin letter it is may have a bad spider injector if its cfi (vin Z) it also has enough miles on it to have a bad intake gasket Quote Link to comment Share on other sites More sharing options...
99ta Posted April 9, 2007 Author Report Share Posted April 9, 2007 8th space is a z....how do I check these things. Or is it just trial and error? Eric Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted April 10, 2007 Report Share Posted April 10, 2007 check for fuel in the oil..... you can buy a new injector assembly if its bad Quote Link to comment Share on other sites More sharing options...
99ta Posted April 10, 2007 Author Report Share Posted April 10, 2007 thanks....I will check that in the morning. I should be able to smell it on the dipstick right? Or will I have to drain it to check. Eric Quote Link to comment Share on other sites More sharing options...
99ta Posted April 10, 2007 Author Report Share Posted April 10, 2007 fixed it.....it was a plug wire. Thanks for the help! Eric Quote Link to comment Share on other sites More sharing options...
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