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Worn out spark plugs = bad running? 200

posted by  Volvodad on  Sat May 1 16:09 CST 2004
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last visit: Thu Oct 23 16:18 CST 2014
[RELATED]

OK - it's stating the obvious...but-

In the course of some major maintenance (new engine and ignition harnesses, rebuilt injectors, cleaned throttle body, etc.) I pulled the plugs and installed my favorites, NGK BP6ES. The replaced plugs were Bosch Super - not the recent Made in India ones, but older German made. I believe they've done about 34k mi since new five years ago. The gaps looked a little large so I checked - they varied from .037 to .042. Volvo spec is .028-.032. I know I gapped them to .030 on installation. The erosion all occurred in the center electrode.

The car was starting and running "OK", but didn't feel sharp, and fuel economy was off by maybe 10-15%. There was also a repeated hesitation under heavy or light acceleration...a kind of jerkiness rather than smooth power delivery.

With all the other work, I would damn well hope the thing runs better, but the condition of the plugs was a surprise. I now plan to shorten spark plug run time before replacement, especially with the price of gas now.
--
Bob (81-244GL B21F, 83-244DL B23F, 94-944 B230FD; plus grocery-getter Dodge minivan, MGB, and numerous old motorcycles)






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