Hi All,

I've been having some ignition problems lately on my 1982 244 B21F-MPG (Chrysler white cap ignition) where the engine has been missing while the tach jumps about. Already replaced the coil, cap, rotor and hall effect sensor. Was going to replace the plugs and ignition wires, and am in somewhat of a quandry:

The manual calls out a resistor plug "Bosch WR7DS" for the B21F and a nonresistor plug for the B21A and B23E. I ran across some posts about Volvo OEM wire sets having a low resistance, and requiring a resistor plug for EMI performance. Seems like my problems began after I changed plug and wires at my last big tuneup (a few years ago?)

So my question is whether aftermarket wire sets like Bosch or Bougicord are already "high resistence" and would require a low resistance plug like a W7DC?

Thanks in advance!

Greg

if the plug wires have metal shells on the plug ends, those are resistors and you need non-resistor plugs. in 88 or so, volvo deleted the resistor type wires and supplied the non-resistor type and new part numbers for resistor plugs. only use oe or bougicord wires, other brands cause more problems than they're worth. good luck, chuck.

I run standard plugs and "tinned SS wires" that I custom make and have NEVER had any interfearance issues. Then again, I have never owned a Volvo with the Chrysler ignition either.
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JohnG 1989 245 MT @216,500