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Good going! Not too many of us have taken our 240s that far!
The shudder is the half-million mile warning alert.
As soon as you pass the 500K miles mark the shudder will clear up.
Just kidding of course, about the warning alert.
I haven't heard of that shudder before. I'm very interested to see the answers posted on this one.
I do know that the '89 has a main headlight relay located on drivers kick panel. And I know that killing power to a relay can/will cause a high voltage back emf into the system. Some relays (not the Volvo headlight one) have a diode built in to reroute and dissipate that voltage.
If you get no other answers, I'd clean up all the contacts for that relay (1" gray metal cube with white connector and 5 terminals on drivers kick panel). I'd especially clean up the relay coil's ground which is the black wire at terminal #85.
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Sven: '89 245 NA, 951 ECU, expanded air dam, forward belly pan reaches oem belly pan, airbox heater upgraded, E-fan, 205/65-15 at 50 psi, IPD sways, no a/c-p/s belt, E-Codes, amber front corner reflectors, aero front face, quad horns, tach, small clock.
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