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Jeep Wrangler YJ
YJ General Discussion
1990 2.5 Dieseling Issue
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<blockquote data-quote="Gary747" data-source="post: 427750" data-attributes="member: 19207"><p>Some ideas:</p><p></p><p>Run a carbon-cleaning solvent through your engine. Operate at higher RPM's for awhile. Regardless of its fuel source, a gasoline engine simply cannot diesel without something to ignite the fuel, such as combustion chamber carbon deposits.</p><p></p><p>Check for correct spark plugs. Replace the spark plugs with "colder" heat range rating.</p><p></p><p>Change your oil and replace it with a high-mileage full-synthetic. A new Jasper shouldn’t have much oil getting by the piston rings, but I once replaced a Jasper for spark plug oil fouling.</p><p></p><p>Using a higher octane fuel helps prevent <u>detonation</u>, but it will still diesel.</p></blockquote><p></p>
[QUOTE="Gary747, post: 427750, member: 19207"] Some ideas: Run a carbon-cleaning solvent through your engine. Operate at higher RPM's for awhile. Regardless of its fuel source, a gasoline engine simply cannot diesel without something to ignite the fuel, such as combustion chamber carbon deposits. Check for correct spark plugs. Replace the spark plugs with "colder" heat range rating. Change your oil and replace it with a high-mileage full-synthetic. A new Jasper shouldn’t have much oil getting by the piston rings, but I once replaced a Jasper for spark plug oil fouling. Using a higher octane fuel helps prevent [U]detonation[/U], but it will still diesel. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
1990 2.5 Dieseling Issue
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