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Jeep Wrangler YJ
YJ General Discussion
O2 sensor replacement questions
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<blockquote data-quote="deadpool1" data-source="post: 440302" data-attributes="member: 21229"><p>and that header End gasket not leaking if it leaks the exhaust sucks in air, just after each putt, (have hard proof)</p><p>and this air is 20% oxygen and makes the o2 read 100% lean{0v} (air is lean max) so to compensate the ECU goes max rich ! OOPS FAILS.</p><p>and now the stink. this is called fuel trim on OBD1 and OBD2 both .</p><p>the fuel trim goes 100% rich. in this failing mode a simple exhaust leak.</p><p></p><p>i uses rubber tube to my ear, duct taped to end of round 20" dowel rod. (no burns) and wave it too engine all over that side of engine , exh ports to front </p><p>of muffler. if I hear putt putt to my ears that is an exhaust leak.<strong> fix it.</strong></p><p><strong>case in point,</strong></p><p>my 1988 the SST factory headers loved to crack, and there is a simple cure then, the clamp at the rear busted on 2 of my 88 jeeps. (a factory flaw)</p><p>and the O2 went totally mad and MPG sucked fuel like a pig.</p><p>I designed my own grilla clamp (weld up by me) and drove 250,000 miles not one problem (beyond normal service) 4liter engines.</p></blockquote><p></p>
[QUOTE="deadpool1, post: 440302, member: 21229"] and that header End gasket not leaking if it leaks the exhaust sucks in air, just after each putt, (have hard proof) and this air is 20% oxygen and makes the o2 read 100% lean{0v} (air is lean max) so to compensate the ECU goes max rich ! OOPS FAILS. and now the stink. this is called fuel trim on OBD1 and OBD2 both . the fuel trim goes 100% rich. in this failing mode a simple exhaust leak. i uses rubber tube to my ear, duct taped to end of round 20" dowel rod. (no burns) and wave it too engine all over that side of engine , exh ports to front of muffler. if I hear putt putt to my ears that is an exhaust leak.[B] fix it. case in point,[/B] my 1988 the SST factory headers loved to crack, and there is a simple cure then, the clamp at the rear busted on 2 of my 88 jeeps. (a factory flaw) and the O2 went totally mad and MPG sucked fuel like a pig. I designed my own grilla clamp (weld up by me) and drove 250,000 miles not one problem (beyond normal service) 4liter engines. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
O2 sensor replacement questions
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