bcupari Posted April 29, 2009 Share Posted April 29, 2009 My 99 ES 300 keeps blowing ignition coils. I have replace 3 in the last year, 2 of the same ones twice. Mechanic is baffled. Alternator is fine, new spark plugs and ground to the circuit appears OK. Has anyone else experienced this and if it was solved---how????? Quote Link to comment Share on other sites More sharing options...
stcist2 Posted April 29, 2009 Share Posted April 29, 2009 My 99 ES 300 keeps blowing ignition coils. I have replace 3 in the last year, 2 of the same ones twice. Mechanic is baffled. Alternator is fine, new spark plugs and ground to the circuit appears OK. Has anyone else experienced this and if it was solved---how????? are you getting the new coils from ?Toyota? Lexus? I have seen batches of defective parts more than once, especialy aftermarket Quote Link to comment Share on other sites More sharing options...
homemechanic Posted April 29, 2009 Share Posted April 29, 2009 you could have another bad coil somewhere else. sometimes one coil shorts out temporary causing another to blow. mixing aftermarket coils w/OEM is a no no. i had one short coil 2 months ago and decided to replace the whole set. think of them as spark plugs, you don't replace only 1 plug. while i was removing the other coils, 2 coils had oil dripping out. the spark plug seals were bad. new coils for $60/each from autozone.com. they are actually the OEM parts -- Denso. Quote Link to comment Share on other sites More sharing options...
stcist2 Posted April 29, 2009 Share Posted April 29, 2009 you could have another bad coil somewhere else. sometimes one coil shorts out temporary causing another to blow.mixing aftermarket coils w/OEM is a no no. i had one short coil 2 months ago and decided to replace the whole set. think of them as spark plugs, you don't replace only 1 plug. while i was removing the other coils, 2 coils had oil dripping out. the spark plug seals were bad. new coils for $60/each from autozone.com. they are actually the OEM parts -- Denso. i agree, in the past i had one coil go bad in a ford truck and when i replaced the one coil and plug, the misfire was still there. after a lot of head scratching i replaced all of the coils and wow perfect... this actually happened on several fords i worked on; one coil would go bad and to fix it all the coils had to be replaced Quote Link to comment Share on other sites More sharing options...
homemechanic Posted May 1, 2009 Share Posted May 1, 2009 i forgot. . .you can try to compare the resistance of each old coil to determine if anyone is no good. use a voltmeter for this job. Quote Link to comment Share on other sites More sharing options...
teh vxc wolfkid Posted May 1, 2009 Share Posted May 1, 2009 I just went to hell and back with coils. They were defective from the manufacturer still cost me $1300 that my mechanic isn't refunding. labor/etc. ask them to check with distributor. Quote Link to comment Share on other sites More sharing options...
cadeleon Posted May 6, 2009 Share Posted May 6, 2009 you actually spent 1300 dollars on some ignitions coils? Quote Link to comment Share on other sites More sharing options...
doitlast Posted January 30, 2010 Share Posted January 30, 2010 My 99 ES 300 keeps blowing ignition coils. I have replace 3 in the last year, 2 of the same ones twice. Mechanic is baffled. Alternator is fine, new spark plugs and ground to the circuit appears OK. Has anyone else experienced this and if it was solved---how????? I had 3 coils blown in the last year too (ES 2000 158K). It was on the same cylinder #4 (CEL P0304). Did you find out the real cause for your case? I recently got P0441 and P0446 too. Really appreciate any info on this. Thanks! Quote Link to comment Share on other sites More sharing options...
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