JimKutson Posted July 15, 2007 Report Share Posted July 15, 2007 1999 v70r problem with returning ecm-280a or p1133.The fuel pressure is 380 kpa when problem is happening. Both 02s have been replaced with oem parts also both have oem adaptor harnesses installed. Code is set at full throttle around 5,000 rpm the short term fuel trim goes to 35% long term around 2%---if you let off the gas some keeping steady speed the short term trim will stay at 33-35% and the code is set. I have pressure tested the exhaust with smoke tester and no leaks are found---while under pressure prying on the exhaust no leakage seen. Also no leakage on the intake side. The engine misfires at the same time---full throttle high rpm. All 5 coils are new and spark plugs. I'm thinking injector could be sticking but at this time no green injectors to try. Unsure about it being an injector because with a fault set car in limp home mode open loop---full throttle the car runs fine and no misfire---only in closed loop car misfires at full throttle above 5,000 rpm. The car has a new ECM---running out of money!!! any help?-------------------------------------------------------------------------------------------------------------------------------------------------------------------------Okay I fixed the problem after many waisted hours of my time and money. Back when the code was first set i replaced both o2 sensors and installed the adaptor harnesses that volvo recommends for my VIN with the above code. Turns out im back after a full circle to the front o2 sensor being the problem. Today i replaced the front o2 sensor again and this time my problem is gone. The new front o2 sensor was bad. Happy again with less money!!Jim Link to comment Share on other sites More sharing options...
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