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FJR Motorcycle Forums
Technical & Mechanical Problems
Further details on Fast Idle system
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<blockquote data-quote="chrisflock" data-source="post: 643395" data-attributes="member: 14107"><p>I'm not sure about the buildup on your throttle bodies, I think part of the issue with the buildup is that it preferentially sticks to different materials (some of it may be materials, and some may be temperature?)</p><p></p><p>Here's some examples:</p><p></p><p>98 Neon SOHC (donor vehicle), over a 100k miles, intake tracts in head were very dirty, PLASTIC intake manifold clean, aluminum throttle body housing and throttle body pretty dirty...</p><p></p><p>98 neon DOHC (transplant recipient), over 100k miles, intake tracts in headfairly dirty, aluminum intake fairly dirty, aluminum throttle body housing not very dirty...PCV system was running a breather instead of running to intake for at least 30k miles (aftermarket cold-air intake)</p><p></p><p>76 Small block chevy, PCV vented with breathers for as long as I know, intake, heads, and carb throttles were pretty darn clean (small buildup in the intake under the center of the 4 throttles) some crud on the rougher portions of intake tracts</p><p></p><p>84 Small Block Crate (stuffed into early 80's, carb van), complete emissions system intact, intake (aluminum) had thick coating of crud to the point you could scoop it out of the intake manifold with your fingers, head (cast iron) had a significant buildup of crud, but it wasn't as gooey as what was on the intake.</p><p></p><p>Corvair (60, 61, 62, I'm not sure, the engine had no car holding it back) intakes and heads very clean, as I understand there was emissions system to speak of for this car.</p><p></p><p>Of course, there are many variables that aren't, and cant', be addressed, this is just some guy's experience.</p></blockquote><p></p>
[QUOTE="chrisflock, post: 643395, member: 14107"] I'm not sure about the buildup on your throttle bodies, I think part of the issue with the buildup is that it preferentially sticks to different materials (some of it may be materials, and some may be temperature?) Here's some examples: 98 Neon SOHC (donor vehicle), over a 100k miles, intake tracts in head were very dirty, PLASTIC intake manifold clean, aluminum throttle body housing and throttle body pretty dirty... 98 neon DOHC (transplant recipient), over 100k miles, intake tracts in headfairly dirty, aluminum intake fairly dirty, aluminum throttle body housing not very dirty...PCV system was running a breather instead of running to intake for at least 30k miles (aftermarket cold-air intake) 76 Small block chevy, PCV vented with breathers for as long as I know, intake, heads, and carb throttles were pretty darn clean (small buildup in the intake under the center of the 4 throttles) some crud on the rougher portions of intake tracts 84 Small Block Crate (stuffed into early 80's, carb van), complete emissions system intact, intake (aluminum) had thick coating of crud to the point you could scoop it out of the intake manifold with your fingers, head (cast iron) had a significant buildup of crud, but it wasn't as gooey as what was on the intake. Corvair (60, 61, 62, I'm not sure, the engine had no car holding it back) intakes and heads very clean, as I understand there was emissions system to speak of for this car. Of course, there are many variables that aren't, and cant', be addressed, this is just some guy's experience. [/QUOTE]
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Technical & Mechanical Problems
Further details on Fast Idle system
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