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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: 15571854" data-attributes="member: 122263"><p>Update: I quickly messed with it some more just before the rain hit.</p><p></p><p>The problem appears to be intermittent no fuel on the driver's side?</p><p></p><p>Had the car running, started pulling ignition coils one at a time seeing if it was a specific dead cylinder. When the car was running rough, pulling any of the Driver's side coils had no affect. I was getting spark. When I pulled any of the Passenger side coils, the engine would run worse.</p><p></p><p>So.. the entire driver's side was dead.. Which now seemed familiar because this is how it was behaving when I broke down. That ended up being a snapped secondary chain on the Driver's side and hence why the engine was out (I had the head off and rebuilt as well) So now I'm thinking.. Omg.. it better have compression. So I check the compression: 220 on all four so that's good. Fhew.</p><p></p><p>So I have compression and spark. Next I star unplugging and replugging injectors, checking with test light. They appear to be getting power. If I ground out the white wire, the engine has a slight change in tone. Also, when I pulled the plugs for the compression test, they weren't fuel soaked. Looked real dry.</p><p></p><p>Finally, if you hold the RPMs at say 2k for a bit, the engine will start running normally again. At that point, if I pull a coil on the Driver's side, it'll run worse. Rev the engine up a bit again, hold RPMs, let it back down and it'll nearly stall and start running rough again.</p><p></p><p>So why is it intermittent? Is it an electrical thing or a physical fuel flow problem.. Only guess I can come up with is the car sat for a few months while engine was refreshed, it had a full tank in it, everything was fine for a couple days, I parked it in garage, had the front jacked up, and when I ran the car for a bit like that it started sucking up some gunk or something from the tank. No idea. Or for some reason the ECU is not firing the injectors on the Driver's side.. for no reason.. sometimes. I was reading 40 on the FRP at idle via my OBD2 tuner.</p><p></p><p><strong>Update 2:</strong> Tested a couple of the injectors with a noid light while it was running rough. They are getting the signal. So it has to be a physical thing? But it's just a single rail for both sides.. I don't see how one side wouldn't get fuel and the other would. </p><p></p><p>You can literally sit there and it'll be running perfectly, then you give it a quick rev, and like a light switch, you'll feel it kill that bank and it'll run rough. After that, you can rev it and hold the RPMs for a little bit and, again like a switch, it'll pop into normal smooth operation. I just don't get it. I want to get under it and double check the O2 sensors but it's pouring rain. /riphairout</p></blockquote><p></p>
[QUOTE="SeikenFreak, post: 15571854, member: 122263"] Update: I quickly messed with it some more just before the rain hit. The problem appears to be intermittent no fuel on the driver's side? Had the car running, started pulling ignition coils one at a time seeing if it was a specific dead cylinder. When the car was running rough, pulling any of the Driver's side coils had no affect. I was getting spark. When I pulled any of the Passenger side coils, the engine would run worse. So.. the entire driver's side was dead.. Which now seemed familiar because this is how it was behaving when I broke down. That ended up being a snapped secondary chain on the Driver's side and hence why the engine was out (I had the head off and rebuilt as well) So now I'm thinking.. Omg.. it better have compression. So I check the compression: 220 on all four so that's good. Fhew. So I have compression and spark. Next I star unplugging and replugging injectors, checking with test light. They appear to be getting power. If I ground out the white wire, the engine has a slight change in tone. Also, when I pulled the plugs for the compression test, they weren't fuel soaked. Looked real dry. Finally, if you hold the RPMs at say 2k for a bit, the engine will start running normally again. At that point, if I pull a coil on the Driver's side, it'll run worse. Rev the engine up a bit again, hold RPMs, let it back down and it'll nearly stall and start running rough again. So why is it intermittent? Is it an electrical thing or a physical fuel flow problem.. Only guess I can come up with is the car sat for a few months while engine was refreshed, it had a full tank in it, everything was fine for a couple days, I parked it in garage, had the front jacked up, and when I ran the car for a bit like that it started sucking up some gunk or something from the tank. No idea. Or for some reason the ECU is not firing the injectors on the Driver's side.. for no reason.. sometimes. I was reading 40 on the FRP at idle via my OBD2 tuner. [B]Update 2:[/B] Tested a couple of the injectors with a noid light while it was running rough. They are getting the signal. So it has to be a physical thing? But it's just a single rail for both sides.. I don't see how one side wouldn't get fuel and the other would. You can literally sit there and it'll be running perfectly, then you give it a quick rev, and like a light switch, you'll feel it kill that bank and it'll run rough. After that, you can rev it and hold the RPMs for a little bit and, again like a switch, it'll pop into normal smooth operation. I just don't get it. I want to get under it and double check the O2 sensors but it's pouring rain. /riphairout [/QUOTE]
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Suddenly, Rough Idle And A Bunch Of Codes /Shrug
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