Starlite Posted May 31, 2017 Share Posted May 31, 2017 For a year or so i have this misfire only when warm starting and only for 1-2 seconds. There is no fault codes popping up. I have this tourq lite program and this is what it say. When idle 2500rpm The 02 sensor going up and down. Might be like this i dont know? Quote Link to comment Share on other sites More sharing options...
Starlite Posted July 4, 2017 Author Share Posted July 4, 2017 Finaly i have a pending code. P0174 powertrain system too lean (bank 2) Found another thread about this code and that guy changed a faulty AF sensor. Quote Link to comment Share on other sites More sharing options...
Olnick Posted July 4, 2017 Share Posted July 4, 2017 Wish I could help you, Starlite--hopefully some of our gurus will chime in. I'm sure you Googled your code, that should offer some suggestions. Warm start problems can be caused by a faulty ECTS (Engine Coolant Temperature Sensor)--might be worth checking out. Good luck. Keep checking back here. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted July 5, 2017 Share Posted July 5, 2017 You're going to need someone really good with ECU data to review it. Not many of those post frequently online. But hopefully someone will. I'd replace the front O2 sensors. I plan on 300,000 miles and replacing those once around 150-200k. So if I have an issue I consider this a free fix on my way to 300k, just do preventative maintenance i would do anyway. If valve covers are leaky now or future (common for this age), be sure to check the valve clearance while the covers are off. Exhaust valves are most commonly tight. They're too tightens cause misfires and other issues and eventually burn valves. I've seen one exhaust valve on an all original 200k H6 with zero issues that had zero clearance. I'd swap fuel injector and COP and see if the code moves with the injector/COP or stays with the cylinder. 1 Quote Link to comment Share on other sites More sharing options...
Silent Bob Posted July 5, 2017 Share Posted July 5, 2017 I had one in the shop with similar symptoms- turned out to be a cracked head. Quote Link to comment Share on other sites More sharing options...
Starlite Posted July 5, 2017 Author Share Posted July 5, 2017 I had one in the shop with similar symptoms- turned out to be a cracked head. What symptom did the car have? Was this a 3.0? Quote Link to comment Share on other sites More sharing options...
Starlite Posted July 5, 2017 Author Share Posted July 5, 2017 (edited) The symptoms i have is.. Misfires when warm but not all the times. When driving and make a kickdown a white cloud will appear behind the car. Do a kickdown again and no cloud appear. And this happen only one time when driving the car. Do not leak or dissapear water from the coolant overflow. It did before and i cahnge the radiator cap and it stop. Throwing pending code p0174. Do not overheat, never have. Me myselfe believe its a cracked head or headgasket. 16000km (9900 miles) Have changed the mufflers and noticed alot of water in them. There is no coolant smell in the exhaust. Edited July 5, 2017 by Starlite Quote Link to comment Share on other sites More sharing options...
Silent Bob Posted July 5, 2017 Share Posted July 5, 2017 3.0l Tribeca- misfire at startup &blowing white smoke. It cleared up after a few seconds and ran fine after that, until it sat for a while and the it would repeat. Don't remember whether it overheated or not. Figured out that if I pressurized the cooing system it would push coolant into the cylinder (#3) and I could duplicate the miss and smoke every time I started it. Assumed it to be a HG problem, but machine shop found a crack in the head. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted July 5, 2017 Share Posted July 5, 2017 I'm kinda thinking an oil analysis might be helpful. If coolant or fuel are creeping-in when the engine is off, traces might be found in the oil. Any company available to you like Blackstone or Polaris here in the US? also, given the few miles, kinda wondering if the PCV system might need servicing. how is the car used? very short trips? long intervals of sitting but some distance when driven? Quote Link to comment Share on other sites More sharing options...
Starlite Posted July 13, 2017 Author Share Posted July 13, 2017 Im running the tourque app and noticed the O2 volts bank2 sensor 2 is pending. The graph is not smooth as the Bank 1 sensor 2 so there is something wrong there. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.