mjtjnj Posted October 22, 2008 Share Posted October 22, 2008 Got about 750 miles on my rebuilt 2.5 now, and it's running pretty well (except the TPS problem). It's been using some oil since I first started it (changed the oil after the initial startup and at 500mi), but it's not smoking and the plugs aren't oil-fouled. I called the builder and he was surprised to hear I don't have a PCV valve, and he asked me to test vacuum at the dipstick with the vehicle running (haven't done this yet). I've had 3 MJ's with the 2.5, two manual and one automatic (86, 87, and 87) and NONE of them have had a PCV valve. I have vacuum to the rear of the valve cover, and a hose to the air cleaner at the front. I used to get blowby before the rebuild, but not any more. And no leaks! Should I be worried about the rings? This guy is a good builder. Do I just need to give it more time? On the TPS - I used to get the classical "dead spot" on the TPS, but this went away with cleaning the connectors one time. Since the rebuild I have an intermittent dead spot AND and intermittent BACKFIRE when I'm accelerating under a load (up a hill, etc). Is this typical for TPS failure? I have a buddy who has access to a MT2500 and we're going to replace the sensor one of these weekends. Just hope that's all there is to it. Thanks! Tom Link to comment Share on other sites More sharing options...
mjtjnj Posted October 23, 2008 Author Share Posted October 23, 2008 anyone on the PCV or lack thereof? Rockauto lists a PCV valve for my application. :???: Link to comment Share on other sites More sharing options...
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