Volvo Maintenance Hints for 7xx/9xx - Bill Garland's Nuclear ...

Abbreviations:
AMM Air Mass Meter
ECT Engine Coolant Temperature sensor
ECU Engine Control Unit computer (either fuel injection or ignition)
FI Fuel Injection
FPR Fuel Pressure Regulator
IAC Idle Air Control solenoid valve
TB Throttle Body
TPS Throttle Position Sensor
VSS Vehicle Speed Sensor
Caution on Diagnostics and Shop Errors. I solved my 95 960's mystery of code 2-3-
2, uneven rpm's at idle, and an apparently faulty MAF. The local Volvo dealer wanted
to put in two O2 sensors, a new MAF, and other unnecessary service at a cost of
$1275. I tested the car's single O2 (not two sensors), and it was fine. I replaced the
MAF with a used one for $150, and when the 2-3-2 persisted, I found a plugged
vacuum hole in the throttle body! I cleaned it out and now it runs fine.
Word to the wise: shop service writers will take you any way they can unless you are
well informed. Always do some research before you entrust your car to the shop. The
dealer wanted $1275 mostly for parts that my car does not have (2nd O2), was not
broken (existing O2), could be found used very easily (MAF), and were very easy and
simple to fix (throttle body vacuum). Caveat Emptor.
Idle Problems:
Poor Idle, Idle Surge and Hunt: Cleaning Your Throttle Body. .