Volvo RWD 140-160 Forum

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engine diesels and idles rough 140-160

posted by  someone claiming to be slwrcar on  Thu Jun 24 16:39 CST 2004 [RELATED]

My 68 142 has recently undergone a head swap. It now has a B20-F cylinder head. My problem however is with the cooling system (the temp guage strays upwards when idling), the idle is quite rough and it diesels when I turn it off. (The carb is a weber dgv 32-36 and has larger idle jets). If somebody has advice I would greatly appreciate it.








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engine diesels and idles rough 140-160

posted by  someone claiming to be Rhys on  Thu Jun 24 18:57 CST 2004 [RELATED]

You can cure the dieseling by slowing the engine down, cooling it down, and leaning the idle mixture. Generally speaking fast, hot and rich will cause dieseling.







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engine diesels and idles rough 140-160

posted by  someone claiming to be mjamgb on  Sat Jun 26 14:54 CST 2004 [RELATED]

Excessively lean causes the burn to be hotter and causes hot spots in the cylinder that can lead to dieseling too.
You are best off perfoming a complete tune-up to reasonable specs including a check of the carb float level and fuel pressure. Then take the rig to a dyno to tune the carb.
Excessive advance, carb out of adjustment (either rich or lean), flooding, and poor gas all lead to excessive heat and dieseling.







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