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Search: Posts Made By: upallnight
Forum: X5 (E53) Forum 06-10-2021, 09:17 PM
Replies: 35
Views: 913
Posted By upallnight
Even a cylinder with good rings will go up in...

Even a cylinder with good rings will go up in compression if you squirt oil into the cylinder.
Forum: X5 (E53) Forum 06-10-2021, 02:38 PM
Replies: 35
Views: 913
Posted By upallnight
You tube is your friend. Some auto parts stores...

You tube is your friend. Some auto parts stores may loan you the tool to perform a leak down.
Forum: X5 (E53) Forum 06-10-2021, 02:37 PM
Replies: 35
Views: 913
Posted By upallnight
It will shutdown under low compression because...

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...
Forum: X5 (E53) Forum 06-10-2021, 12:57 PM
Replies: 35
Views: 913
Posted By upallnight
Check engine light came on most likely due to...

Check engine light came on most likely due to misfire (count on the DME). When that happens the DME shut down the injector to the cylinder that the misfire was detected on. With the injector shut...
Forum: X5 (E53) Forum 06-10-2021, 11:42 AM
Replies: 35
Views: 913
Posted By upallnight
All that tells you is that the injector is...

All that tells you is that the injector is getting a signal (grounding signal) from the DME that the injector should open.
Forum: X5 (E53) Forum 06-10-2021, 11:39 AM
Replies: 35
Views: 913
Posted By upallnight
A leak-down test will tell you if it is the rings...

A leak-down test will tell you if it is the rings or valves.
Forum: X5 (E53) Forum 06-10-2021, 11:26 AM
Replies: 35
Views: 913
Posted By upallnight
Even 100 is low. Something is not right.

Even 100 is low. Something is not right.
Forum: X5 (E53) Forum 06-10-2021, 11:22 AM
Replies: 35
Views: 913
Posted By upallnight
A cylinder that has only 35 psi of compression is...

A cylinder that has only 35 psi of compression is definitely going to produce less power than the other cylinders, but you have other cylinders with misfires. Before saying it the ring, it could be...
Forum: X5 (E53) Forum 06-09-2021, 09:28 AM
Replies: 35
Views: 913
Posted By upallnight
A crack boot would have given you a P0171 or...

A crack boot would have given you a P0171 or P0174 code since unmetered air is entering the intake and to compensate for this unmetered air the computer would have added fuel to the fuel trim. You...
Forum: X5 (E53) Forum 06-08-2021, 11:33 PM
Replies: 35
Views: 913
Posted By upallnight
A misfire in a modern computer control engine is...

A misfire in a modern computer control engine is not the same as a misfire in an engine that has a carburetor and a distributor. Misfires in those old engines could be traced to spark plugs,...
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