Almost immediately after we bought V-Lo she started to stall on us, it would occur randomly and without warning. We knew the car wasn't perfect and set out on troubleshooting and researching causes. The reason I am starting this blog is simple. There wasn't a lot of information out there and what was there wasn't as helpful.
V-Lo would stall at stop lights when you tried to accelerate. She would stall while parked and idling. Sometimes she would stall while cornering making a left or right turn. It got to a point that it was becoming a hazard and downright frustrating.
Here are some of the sites I did manage to find some info from:
Volvo Maintenance FAQ for 7xx/9xx/90 Cars
I refer to this site often when issues arise with V-Lo. It gave me areas to focus on. I soon realized that the cause can be from many different parts or combination of parts.
We replaced the Fuel Pump, Knock Sensor, Distributor Cap and Rotor, Spark Plug Wires, Engine Coolent Sensor (ECT), RPM Sensor, Cleaned the Idle Air Control (IAC) Valve, Mass Air Sensor, Ignition Power Stage (Twice we replaced this).
Each time things improved, but the staling continued. Finally I decided think hard as to what we have done thus far. We have replaced all but the coil in the electrical system. The voltmeter showed no issues in the electrical system, so the issue must be fuel related.
In looking at the fuel system, we replaced the fuel pump, so that couldn't be the cause. There was adequate fuel pressure, so that couldn't be it either. That only left two things, the Fuel Injectors or the Fuel Pressure Regulator (FPR). Well at 50 bucks per injector, I decided to look at the cheaper part first, the FPR.
After replacing the FPR, guess what NO MORE stalling. She has been running strong without issues for over a year now.
Hope you saved your old FPR to make a fuel pump pressure tester.
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