Quote:
Originally Posted by Phalcon51
I'm borrowing a scan tool from a friend this weekend to check out what's going on inside. I'll look at the misfires. Does the computer store this value, or only check it while the engine is running?
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Miss fire counts are active when the engine is running, they get reset / reduced in number after a certain time period and clear when the engine is off. The strategy is manufacturer specific so you would need a service manual to get exact details.
Quote:
Originally Posted by Phalcon51
Would the scan tool show the lean mixture or ignition timing issues, if present?
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There is a long term and short term fuel trim that would indicate the computer is compensating for lean or rich mixture. There is usually spark advance data on the scan tool however this would only be useful if you knew what it should be. This is only what the computer wants the advance to be not necessarily what it actually is during a problem.
Quote:
Originally Posted by Phalcon51
Can you (or anyone else) recommend a good, not overly expensive scan tool that that will interface with my laptop?
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Define " overly expensive ". The $ is in the software not the hardware. For perspective, last I checked a real MB scan tool ( Xentry ) is something like $ 20,000 plus $ 6,000 per year to keep current. If the subscription isn't kept current, the scanner bricks.
Contact the guy in post 12
https://www.peachparts.com/shopforum/tech-help/399966-w211-air-suspension-pump-replacement.html
Quote:
Originally Posted by Phalcon51
Any easy way to check for a broken valve spring? Also, are these interference or non-interference engines?
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I don't know if these are valve benders or not, this only comes into play if the a timing chain / belt hops multiple teeth or breaks
The only way to check for a broken valve spring is to remove a valve cover on the side that is making noise.