20 Most Recent 1998 Volvo V70 - Page 8 Questions & Answers

Centre console under coin tray.

possibly.......

inside the transmision

HelloThe Engine and Automatic Transmission (not applicable to manual transmissions) in this vehicles drive train are fully electronically controlled by a computer called the PCM and TCM (Power Train Control Module, Transmission Control Module). When a problem like this or other drive-ability related problems occurs the computer stores a record of the problem (there are of course some exceptions to this, like the fuel pump, engine coolant temperature sensor and MAF sensor for instance) in the form of a fault code in its memory, to read these fault codes you must have the systems memory scanned with a special tool. Once the fault code(s) are read you then must perform the appropriate diagnostic testing to find and resolve the problem(s) DO NOT REPLACE ANY PARTS UNTIL A TRAINED TECHNICAIN HAS DIAGNOSED THE PROBLEM TO AVOID SPENDING YOUR HARD EARNED MONEY ON PARTS THAT MAY NOT CORRECT THE PROBLEM. Also always check fuel pressure for correct spec for your make and engine type.

Need to check ABS codes...may be sensor in top of rear diff.

The first thing you need is A/C evacuation and recharging equipment. If you do not have this, then I would recommend that you take your vehicle to a professional that does. Otherwise, you are only wasting your time and money.

i believe they are above the headliner

Heater core leaking. Remove and replace.

GUESTIMATES:A fuel pump that is weak. Including a plugged up pump sock (filter) in the tank. (pressure testing of the fuel system verifies this)A plugged fuel filter, air filter, or anything that has been drawn into the intake restricting the air. (like a plastic bag or cloth-remove and inspect)One of the many sensors not functioning properly. They can be tested. but usually will provide a DTC, (diagnostic trouble code) and trigger a warning light if they are far out of range.A poorly tuned engine that has caused the catalytic convertor to become plugged up, that restricts exhaust as more fuel enters it. (such as on acceleration, you may need a serious tune-up) IF the converter is plugged, usually the exhaust behind it will corrode quickly and even start to fall apart.Too many variables to be specific, but maybe this will give you something to check and eliminate possible reasons one at a time.Good luck!

Check all the wheel sensors one by one , if these are good then check the lines from the sensors, in some cases this can be snapped or damaged or out of the socket.if these are in good shape the main control unit can be a suspect. check the connectors to the unit before you try and get one to swap for confirmation.