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Fox Body Mustangs
Extremely rich and rough idle
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<blockquote data-quote="Mustang5L5" data-source="post: 16478700" data-attributes="member: 38517"><p>The failed check valve is an issue, but not a major one. Like I said before, I drove my car for about 10 years with a bad check valve in the pump before I got around to replacing the pump. It ran VERY well, but it held zero pressure with the engine off. Cycling the key would build pressure and then drop off. SO yes, it's faulty, but don't hang up over this thinking it's the cause of your issues now. Just means at some point you should consider replacing the pump.</p><p></p><p>Your reported pressures seem ok. 30psi is a bit low for idle pressure, but 40 psi with vac off is where you need to be. If you can maintain this pressure under load, then the pump is strong enough to overcome the failed check valve. </p><p></p><p>What is going on with code 21 however? If you clear all your codes, and then rerun the test with the vehicle at operating temp, do you still get that code 21? If so, I think you really need to troubleshoot that, and it might involve testing at the ECU pin (Pin 7 & 46) to see if you are returning a proper signal.</p></blockquote><p></p>
[QUOTE="Mustang5L5, post: 16478700, member: 38517"] The failed check valve is an issue, but not a major one. Like I said before, I drove my car for about 10 years with a bad check valve in the pump before I got around to replacing the pump. It ran VERY well, but it held zero pressure with the engine off. Cycling the key would build pressure and then drop off. SO yes, it's faulty, but don't hang up over this thinking it's the cause of your issues now. Just means at some point you should consider replacing the pump. Your reported pressures seem ok. 30psi is a bit low for idle pressure, but 40 psi with vac off is where you need to be. If you can maintain this pressure under load, then the pump is strong enough to overcome the failed check valve. What is going on with code 21 however? If you clear all your codes, and then rerun the test with the vehicle at operating temp, do you still get that code 21? If so, I think you really need to troubleshoot that, and it might involve testing at the ECU pin (Pin 7 & 46) to see if you are returning a proper signal. [/QUOTE]
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Extremely rich and rough idle
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