06-20-2019, 04:21 AM
the gas cap loose does that soeasy, or many other things, even a cracked vent hose. bad cap, loose cap, wrong cap, gee caps are cheap and every cheaper is tighten it , reset the ECU DTC and see it go away, doing the evap 1, leakdown tests on my page is not easy at all. lacking special test cap. to do that , (the regulator near tank could stick open)
and see if it goes away, cap now tight.
It could means the fuel tank will NOT hold pressure about 1/2PSI, ever hear a gas cap pulled off do that whoosh sound on hot day? bingo evap pressure. NORMAL. The cap correct has a vacuum breaker in it SO VACUUM neverhappen here ever.
but to be sure lots of ways for this to fail. sure ! do you smell gas fumes ever? be first. to mention.
the more important are 171s. lean This means the fuel trim has slammed and stuck on lean.
bad O2 sensor , or low fuel pressure, or dirty maf. (just need cleaning) type MAF on my page.
does car drive ok?, all the time, hot and cold and for sure flogged up hills?
id for sure fix 171 first. lean can burn exhaust valves up.
and see if it goes away, cap now tight.
It could means the fuel tank will NOT hold pressure about 1/2PSI, ever hear a gas cap pulled off do that whoosh sound on hot day? bingo evap pressure. NORMAL. The cap correct has a vacuum breaker in it SO VACUUM neverhappen here ever.
but to be sure lots of ways for this to fail. sure ! do you smell gas fumes ever? be first. to mention.
the more important are 171s. lean This means the fuel trim has slammed and stuck on lean.
bad O2 sensor , or low fuel pressure, or dirty maf. (just need cleaning) type MAF on my page.
does car drive ok?, all the time, hot and cold and for sure flogged up hills?
id for sure fix 171 first. lean can burn exhaust valves up.
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