Originally Posted by Louie cat Maybe the gas cap is going bad, heat expands the gas vapors while sitting ,and could be the culprit. Checked that the last time i
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10-13-2017, 04:46 AM | #19 (permalink) |
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Does your Z fire right up (like when new) ?
I read back through the thread & seen 160k on it...with the poor quality gas these day's-you could have an injector or 2 dripping after engine is switched off. I'd try some old school stuff; after driving & letting cool down somewhat-remove spark-plugs & read them,,,also look down in cylinders with a scope. Your A/F sensors may be getting tired also. How's fuel milage,power,oil consumption ? Get a good tech to ride along w/a graphing scan tool & record it.....something is bound to pop up. Any extra information is helpful.
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10-13-2017, 10:37 AM | #20 (permalink) | |
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10-13-2017, 04:32 PM | #21 (permalink) | |
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10-13-2017, 05:53 PM | #22 (permalink) |
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Having no mods; surprised it hasn’t thrown a cel,,,may want to peak at evap canister (R/R behind tire) it could have ruptured or maybe ran over something & damaged it,hose or fittings.
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10-13-2017, 07:40 PM | #23 (permalink) |
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Went out and checked the evap canister, all hoses and connections look visually in good shape with no indications of any fuel leaks. Just the smell of gas coming out of the tailpipes for the first minute after startup.
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10-13-2017, 08:23 PM | #24 (permalink) |
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An educated eye could catch this on a graphing scan tool; I’m learning this newer stuff/ as I come from heavy trucks,Diesel & Old school carburetors etc...it’s really easy for someone who really knows their test equipment & how to use it....not necessarily someone who works at a dealership either.
I’m gonna text & email a couple folks for you & see if I can further steer you in the proper direction.
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10-13-2017, 08:55 PM | #25 (permalink) | |
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10-13-2017, 11:34 PM | #26 (permalink) | |
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Ps scan data won’t show you much if it’s a cold start issue because the AF sensor won’t be accurately reading at that point. |
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10-14-2017, 12:59 AM | #27 (permalink) | |
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Last edited by Z_ealot; 10-14-2017 at 01:03 AM. |
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10-14-2017, 12:36 PM | #30 (permalink) |
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If you do an ecm reset after warm how quickly and how high (or low I guess) do the short term fuel trim jump? Meaning does it jump to something like -15 and keep pegging there as long term drops.
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