Hi everyone. Im new to this forum and was hoping someone could point me in the right direction. (Level of techincal expertise... 7/10)
I have a 93 SC400. it has 177K miles. In the last 3 weeks I have changed a leaky power steering pump and related vacuum hoses to manifold, rebuilt the alternator, changed all plugs and air filter. I tested all my plug wires with my multitester (resistance was within parameters as specified for OEM wires per lexls.coms website.) I have also checked the heater circuit resistance on all 4 O2 sensors (black wires) and were found to be at 6.3 K ohms as outlined in lexls.com...
The car has always... and even today... starts perfectly both hot and cold. But from standstill I get a lot of knocking/pinging and the car 'bucks' while driving. At idle when warm the engine RPM (under load) periodically drops below 500 and unless I tap on the throttle it wants to stall.
Until the power steering pump change 3 weeks ago... I have NEVER had issues with the car. Routine maintenance of course... but no issues that have stumped me. Until now.
Please advise! Thanks! :cries:
