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#11
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
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#12
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There is a ton of stuff that can cause your problem. I would lean towards looking for a vacuum leak to start. It would be nice if you where sure that you are reading all of the codes as there should be a clue as to what else is going on to cause the missfire. When the engine is first started it has the least amount of adaptability to compensate for problems, use that to your advantage to find the problem.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#13
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I have a mity-vac to check vacuum, but I have no clue where to start on the X. Wouldn't a code show for a vacuum leak? I guess I'll do a full scan with the Foxwell, not just the DME and see what turns up. Thank you upallnight you have given me good advice. Thank you also EODguy and 80stech for adding to this. It's 16*F this morning (thats -9C for your smart metric folks), I'll start it shortly and see if its better/worse with the very cold weather.
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Cal Tidewater Virginia, USA 2005 X5 3.0i 315,000 miles! |
#14
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First thing I did was read the codes, a complete scan, before I started it. Nothing found, other than the persistant air bag and side light codes. This mornings cold start yielded the standard lumpy idle, but it did smooth out in about 30 seconds and no SES light. I then read the codes again and the typical misfire of 3+5 showed up, but that was all. Sometimes the misfire stays for several minutes or miles and I have to kill the SES light with the Foxwell. Then it starts and runs fine until the next cold start.
What vacuum leak would go away in less than a minute? It seems to always include cyl. 3. The others vary but 3 is always one of the ones with a miss. Is there a cold start solenoid or circuit that turns off a few seconds after a successful start? Could the injectors be malfunctioning? How hard are they to swap from cyl. to cyl? Thanks in advance for any additional advice, I'm not sure where to go from here. Coils and plugs are both new.
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Cal Tidewater Virginia, USA 2005 X5 3.0i 315,000 miles! |
#15
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I am having an idle misfire with my 3.0 X5. Originally my plugs were worn and changing cleared it. I would try a bottle of Techron (larger bottle) and good gas (Shell or Chevron) and see if that helps. Intake deposits or injector deposits can cause this type of problem. Vacuum leaks such as failed PCV hoses or separator or intake boot cracks along with valve cover gasket leak are all common failure points on M54 engine.
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#16
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As for the vacuum leaks I'll do some research to find where the PCV is on this thing then do some vacuum testing. I've noticed no oil leaks around the VC. The snorkel between the fresh air scoop and the air filter intake hose has a crack but it is on the fresh (unfiltered) side of the air filter, so that shouldn't affect it. If I run across anything else pertinent I'll post. Thanks again for the help.
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Cal Tidewater Virginia, USA 2005 X5 3.0i 315,000 miles! |
#17
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Could this be weather related?
We have had a cold snap lately (just coming out of it today), I have also noticed some mayo on the dipstick and oil fill cap. I know these are related to the cold weather problem with the EGR valve/system. Temps (when I start in the morning) have been in the teens F. I know thats not cold for some of you but my X, I am sure, doesn't have any cold weather options. I have read this situation can cause an idle misfire? Need I look into this more or am I way off the track? Hopefully it will start well tomorrow morning with the warmer weather. TIA.
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Cal Tidewater Virginia, USA 2005 X5 3.0i 315,000 miles! |
#18
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If it starts misfiring when you first start up but go away after the engine has run for a while, I would look into a leaky injector. Just like a flooded engine, a flooded cylinder will not run correctly. It is only after the engine has run enough to clear the cylinder that the misfire is no longer present.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#19
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If it is exclusively on 4,5,6 I would check your grounds for that bank. I had an issue with 1,2,3 a couple months ago. Turned out to be a seeping Valve Cover Gasket, was getting oil everywhere and down in the wells, but also shorted out my ground.
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Auto Enthusiast. Tech Extraordinaire. 05' Land Rover LR3 06' E53 X5 3.0i 07' X3 3.0si 08' X3 3.0si 17' Interceptor 3.7 AWD Sedan |
#20
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Cal Tidewater Virginia, USA 2005 X5 3.0i 315,000 miles! |
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