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#21
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More info that might help
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#22
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Quote:
Do a leak down test to determine if you have a cylinder leak.
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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 |
#23
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That makes sense. I was thinking it computer shut off signal to coil, but I get now that it would be the injector so it wouldn't be moving fuel through dead cylinder. I wonder how much other stuff I don't know that I don't know. Actually I have learned quite a bit in last couple weeks. Would it shut down over low compression and if so How does it know? The crankshaft sensor?
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#24
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I'll see if I can figure out how to perform a leak down test.
Last edited by Briansbummerbmw; 06-10-2021 at 01:34 PM. |
#25
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It will shutdown under low compression because that cylinder is weaker than a good cylinder, hence a misfire is recorded. The crank revolution is known to the computer as rpm. The computer can detect a drop in rpm from a weak cylinder.
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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 |
#26
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You tube is your friend. Some auto parts stores may loan you the tool to perform a leak down.
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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 |
#27
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Put a few squirts of oil into the cylinder and do compression test again, If it goes up (will probably be almost normal) it's stuck rings.
BTW -INPA will give you a live power balance on each cylinder.
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1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#28
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Even a cylinder with good rings will go up in compression if you squirt oil into the cylinder.
__________________
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 |
#29
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I was contemplating just taking off the head and having a look. I dont have much to lose. I couldn't get much more than scrap price with the shape it's in. Maybe the cat converters are worth something. But with that many miles something in the bottom end might go next so it might be better to give up. So I put seafoam in the 2 misfire cylinders and let it soak all day. Turned it over a bit to spit it out then put plugs back in, hooked up everything and cranked her up and sputtered around the block. No improvement.. Just blowing smoke. In the morning I'm going to check the compression in the other cylinders I'm really curious. The next thing on plan is the leak down test, or maybe first (If I am understanding correctly) I'll put a bit of oil in the cylinder and if the compression rises significantly that would mean the problem is more likely the rings and not the valves or head gasket. That would be the end of the road. Maybe a used motor is an option. Well tomorrow is a new day.
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#30
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If the rest of the X5 is worth keeping, an engine replacement or a head gasket job is not too bad.
While I have seen ring and piston failure, a problem with your valves is more common. A leakdown test and/or a borescope might confirm this. If your problems are just in the head, don't worry about miles on engine. These engines are good for well over 400k miles. My daily driver is an '03 530i w/411k miles. In most cases involving an M54 engine, I prefer a used engine replacement to a head gasket job, but in a 6 cyl X5, you have really good access to everything, so I prefer a head gasket, which I have done twice.. The car stays on its wheels the whole time. other tips: lift head with exhaust manifold attached - use a hoist plan on time-serting block (which I do even if it did not overheat) use the slightly thicker 1.0mm gasket replace coolant pipes and OFHG with intake off. new CCV I am not necessarily suggesting you do this yourself, but go have a conversations with a non-dealer BMW specialist in your area about a head gasket. I would strongly suggest you find somebody who has done an M54 head gasket before. Last edited by Effduration; 06-11-2021 at 08:09 AM. |
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