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SN-95 and New Edge Mustangs
Suddenly, Rough Idle And A Bunch Of Codes /Shrug
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<blockquote data-quote="SeikenFreak" data-source="post: 15571663" data-attributes="member: 122263"><p>It's a 2003 Mach 1 but this shouldn't be something specific to that. I want to summarize this the best I can to keep it short and sweet. I have a more specific odd situation and, unfortunately, the weather is BS so I can't go mess with this myself. I thought I'd ask and maybe save some time.</p><p></p><p>Codes: P0130 P1130 P1131 P1150 P1151 P1152 etc</p><p></p><p>The questions I have before the tl;dr story:</p><p>1. Does it matter which upstream O2 sensor is plugged into which plug of the harness (is there a left and right)? Maybe they are plugged in backwards?</p><p>2. Will the car throw all these codes and behave this way if NONE of the O2 sensors are plugged in? Because my other guess is that maybe I somehow yanked the main trans/O2 sensor harness plug loose when I was getting the new extension plugged in. I don't see how, I wasn't rough, but who knows.</p><p></p><p>------------------------------------------------------------------------------------------</p><p></p><p>Essentially, reinstalled the engine a couple weeks ago, we had a brain fart and didn't think about laying out the trans harness before lifting the engine/trans back up into the car. So we were unable to get the driver's side upstream O2 sensor plugged in because the plug was no where near it.</p><p></p><p>I drove the car for a couple days and it ran perfectly. <u><strong>The passenger side and both rear O2 sensors were plugged in during this time.</strong></u> Due to some small oil leaks, I parked it in the garage, started working on it and ordered an O2 sensor extension which I figured would be easier than lowering the engine/trans to adjust the harness.</p><p></p><p>Fast forward about a week later, I fixed the oil leaks underneath and the O2 extension finally arrived. I plug it in and run the car. After idling for a bit, it starts to run rough, sounds like its down a cylinder, almost stalling etc. Eventually, it throws a check engine light with those 4-5 different codes. Sometimes, the engine will suddenly clear itself up and run completely smooth. I disconnected the MAF and the engine did change its pitch/revs but still ran mostly the same.</p><p></p><p>I just went out, wiped the ECU, let the car idle, it ran fine, and then as the car warmed up it started to idle rough and acts as if it's down a cylinder. Drive it around the block a few times, definitely feels down on power. Idle in my driveway more, still rough, tap the throttle, perfectly smooth again.. etc No Check Engine Light came on during this but it seems to take like 30 mins for it to finally trigger.</p><p></p><p>------------------------------------------------------------------------------------------</p><p></p><p>So yea, I have no idea why all of a sudden its behaving this way. I didn't do any work around the engine except for repairing oil hoses, so it's not like I accidentally created a vacuum leak, messed up a intake gasket somewhere, or yanked some MAF/Intake sensor wire out etc.</p><p></p><p>Before anyone lists the code definitions, I already looked around online a bit and read diagnosing etc. Really just looking for answers to the questions above.</p></blockquote><p></p>
[QUOTE="SeikenFreak, post: 15571663, member: 122263"] It's a 2003 Mach 1 but this shouldn't be something specific to that. I want to summarize this the best I can to keep it short and sweet. I have a more specific odd situation and, unfortunately, the weather is BS so I can't go mess with this myself. I thought I'd ask and maybe save some time. Codes: P0130 P1130 P1131 P1150 P1151 P1152 etc The questions I have before the tl;dr story: 1. Does it matter which upstream O2 sensor is plugged into which plug of the harness (is there a left and right)? Maybe they are plugged in backwards? 2. Will the car throw all these codes and behave this way if NONE of the O2 sensors are plugged in? Because my other guess is that maybe I somehow yanked the main trans/O2 sensor harness plug loose when I was getting the new extension plugged in. I don't see how, I wasn't rough, but who knows. ------------------------------------------------------------------------------------------ Essentially, reinstalled the engine a couple weeks ago, we had a brain fart and didn't think about laying out the trans harness before lifting the engine/trans back up into the car. So we were unable to get the driver's side upstream O2 sensor plugged in because the plug was no where near it. I drove the car for a couple days and it ran perfectly. [U][B]The passenger side and both rear O2 sensors were plugged in during this time.[/B][/U] Due to some small oil leaks, I parked it in the garage, started working on it and ordered an O2 sensor extension which I figured would be easier than lowering the engine/trans to adjust the harness. Fast forward about a week later, I fixed the oil leaks underneath and the O2 extension finally arrived. I plug it in and run the car. After idling for a bit, it starts to run rough, sounds like its down a cylinder, almost stalling etc. Eventually, it throws a check engine light with those 4-5 different codes. Sometimes, the engine will suddenly clear itself up and run completely smooth. I disconnected the MAF and the engine did change its pitch/revs but still ran mostly the same. I just went out, wiped the ECU, let the car idle, it ran fine, and then as the car warmed up it started to idle rough and acts as if it's down a cylinder. Drive it around the block a few times, definitely feels down on power. Idle in my driveway more, still rough, tap the throttle, perfectly smooth again.. etc No Check Engine Light came on during this but it seems to take like 30 mins for it to finally trigger. ------------------------------------------------------------------------------------------ So yea, I have no idea why all of a sudden its behaving this way. I didn't do any work around the engine except for repairing oil hoses, so it's not like I accidentally created a vacuum leak, messed up a intake gasket somewhere, or yanked some MAF/Intake sensor wire out etc. Before anyone lists the code definitions, I already looked around online a bit and read diagnosing etc. Really just looking for answers to the questions above. [/QUOTE]
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Suddenly, Rough Idle And A Bunch Of Codes /Shrug
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