fuckfest Posted March 26, 2007 Report Share Posted March 26, 2007 I have a 1995 STS 4.6L. It´s having a misfire when passing 80km/h (55mph). It´s just a few coughs, then it´s just fine again. Could it be spark plugs or wires? Someone told me that it has special plugs that should hold up for 160000km (100K miles). Is that for real? I´ve never heard about anything like that before. Unfortunatly, cadillac is a very expencive brand of car here in Norway, so the local car repair shops don´t have any experience with this motors. Can someone tell me? Link to comment Share on other sites More sharing options...
JimD Posted March 26, 2007 Report Share Posted March 26, 2007 You can expect the factory installed plugs (ACDelco) to run to 100,000 miles. The main difference in your "special" plugs is the use of platinum electrodes but that is a significant difference in terms of plug life. For more than you wanted to know about platinum plugs, here is just an example of what is available on the web. http://www.babcox.com/editorial/cm/cm120032.htm Your misfire could be caused by a number of things including plugs, plug wires, wire routing, and coils. According to your description, a fuel system problem seems unlikely. You will have to systematically eliminate possibilities. And a competent repair shop should have no difficulty diagnosing an ignition problem on your engine since all gasoline engine ignition systems do exactly the same thing. I experienced a problem similar to what you describe on another engine type. The problem turned out to be one of the ignition coils was failing under certain conditions. Difficult to diagnose. Satisfying to repair. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
fuckfest Posted March 26, 2007 Author Report Share Posted March 26, 2007 Thanks JimD, I think I go for the plugs and wires as it´s near to 100K miles. Today I changed the rear brake pads, easy work! The difficult part was to get them from USA... Link to comment Share on other sites More sharing options...
kev2 Posted March 26, 2007 Report Share Posted March 26, 2007 Can you order the parts online, and ship to your home, as time is not urgent. Alos, run thru the diagnostic check looking for codes.... A hickup if only once or twice, and no other problems, have you considered a fuel "quality" problem - water, dirty injector? Link to comment Share on other sites More sharing options...
Spurlee Posted March 26, 2007 Report Share Posted March 26, 2007 Platinum tipped plugs will last for 100,000 miles but they will be pretty well worn by then - I'd suggest new plugs, then new wires. I bought my high performance wires here: http://www.ultrarev.com/home.php but you can probably get them cheaper elsewhere. Scott 1996 El Dorado 2006 STS 2000 Corvette Link to comment Share on other sites More sharing options...
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