Hi All,
Looking after a friends 1998 V70. It is a B5252FS (twin cam, 10 valve, NA engine). Have done the following:
1) Valve stem seals (I used the old rope down the spark plug hole trick so that I could do it with head in place...)
2) O2 sensor, MAF sensor
3) Distributor cap, and leads, rotor button.
4) Replaced timing belt (138 teeth....) and associated bits, etc
5) Cylinder compression varies from 155 to 175 PSI, so reasonable I am guessing
6) Chased down and eliminated all air leaks in the induction system
7) New PCV setup.
Initially, car ran brilliantly, (all one could wish for, but shortly afterward developed the following issue).
Currently starts easily, and runs perfectly with good power for about a minute, then loss of power, and struggles to accelerate, coughs and sputters. If the engine is left off momentarily (say a minute or so), engine again starts easily, and runs well for the same short period, before repeat of symptoms. These symptoms now consistent
There are no fault codes generated during this process (reads 1-1-1, its a Fenix 5.2, so I made up a LED test light system to read codes via the OBD2 port, and clear old codes).
Fuel pressure at start up reads 32 PSI, which seems a tad low, but car runs perfectly, then when car is allowed to continue idling as above, runs rough and the reading fluctuates a little, but ends up reading up to 41 PSI. I swapped fuel pump relay for a known good one, without effect. I removed the fuel filter, I can confirm that the flow through the filter appears excellent.
I am starting to think it may be the fuel pressure regulator.
Any advice would be greatly appreciated.
Cheers,
Richard.
Looking after a friends 1998 V70. It is a B5252FS (twin cam, 10 valve, NA engine). Have done the following:
1) Valve stem seals (I used the old rope down the spark plug hole trick so that I could do it with head in place...)
2) O2 sensor, MAF sensor
3) Distributor cap, and leads, rotor button.
4) Replaced timing belt (138 teeth....) and associated bits, etc
5) Cylinder compression varies from 155 to 175 PSI, so reasonable I am guessing
6) Chased down and eliminated all air leaks in the induction system
7) New PCV setup.
Initially, car ran brilliantly, (all one could wish for, but shortly afterward developed the following issue).
Currently starts easily, and runs perfectly with good power for about a minute, then loss of power, and struggles to accelerate, coughs and sputters. If the engine is left off momentarily (say a minute or so), engine again starts easily, and runs well for the same short period, before repeat of symptoms. These symptoms now consistent
There are no fault codes generated during this process (reads 1-1-1, its a Fenix 5.2, so I made up a LED test light system to read codes via the OBD2 port, and clear old codes).
Fuel pressure at start up reads 32 PSI, which seems a tad low, but car runs perfectly, then when car is allowed to continue idling as above, runs rough and the reading fluctuates a little, but ends up reading up to 41 PSI. I swapped fuel pump relay for a known good one, without effect. I removed the fuel filter, I can confirm that the flow through the filter appears excellent.
I am starting to think it may be the fuel pressure regulator.
Any advice would be greatly appreciated.
Cheers,
Richard.
