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Extremely rich and rough idle
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<blockquote data-quote="AfricanSnowOwl" data-source="post: 16489035" data-attributes="member: 168923"><p>The ECU was a DA1, but a faulty DVOM led me to believe it was outputting incorrect vref voltage, so I replaced it with a refurbished one from Autozone. I double checked the part numbers from the company that refurbishes, and it checks as a speed density 87-88 5.0 mustang. There was absolutely no change to the idle when I swapped the computers out. I also opened it up to check the capacitors. </p><p>While it's running, if I pull any plug wire there is no change in idle. The vacuum stays the same, the idle rpm stays the same, and the rough idle doesn't change at all. All plug wires have a strong spark though. It actually didn't even change if I pulled 2 plug wires...</p><p>The fuel in the tank is only a few weeks old. I ran it til it died before that, and then filled it with 93. </p><p>The code 67 I think was coming from the A/C WOT relay. It had multiple wires coming out of it that were bare, one of those wires was the red 12v wire, which was touching the other bare wire. </p><p>If I pull the IAC, it will sputter and almost die. I tried pulling the MAP connector, and the idle changed. Not significantly worse, but it definitely changed. My understanding is without the sensor it gets 5v to the signal wire? </p><p>I've pulled the #1 plug and checked the TDC on the balancer a few times. Every time it always lines up to what looks like the TDC mark, and the rotor points at 12 o'clock. I also tried purposely stabbing the distributor "one tooth off" in each direction, and then 180 degrees off just to check. It hold the 14 degrees I have set with the spout removed, and if I plug it in you can see the computer take over timing and move it. </p><p></p><p>I bought this car from a co-worker earlier in the year. He was the only owner, but this car spent the last 8 years sitting in a parking lot on base. He would move it from spot to spot once every month or so. I did a basic tune-up before I drove it home(plugs, wires, cap, rotor, fuel filter), but I honestly can't remember if the idle was this jacked up before I started messing with it. I do remember the idle hanging high every time I came to a stop. </p><p>I pretty much did everything all at once. I immediately did a 5 lug conversion and then changed all fluids, replaced all vacuum lines, new battery, full exhaust, EGR/smog delete, replaced every single sensor, upper intake gasket, 70mm TB, 3G alt, fuel pump. I then started trying to single out this idle issue.</p></blockquote><p></p>
[QUOTE="AfricanSnowOwl, post: 16489035, member: 168923"] The ECU was a DA1, but a faulty DVOM led me to believe it was outputting incorrect vref voltage, so I replaced it with a refurbished one from Autozone. I double checked the part numbers from the company that refurbishes, and it checks as a speed density 87-88 5.0 mustang. There was absolutely no change to the idle when I swapped the computers out. I also opened it up to check the capacitors. While it's running, if I pull any plug wire there is no change in idle. The vacuum stays the same, the idle rpm stays the same, and the rough idle doesn't change at all. All plug wires have a strong spark though. It actually didn't even change if I pulled 2 plug wires... The fuel in the tank is only a few weeks old. I ran it til it died before that, and then filled it with 93. The code 67 I think was coming from the A/C WOT relay. It had multiple wires coming out of it that were bare, one of those wires was the red 12v wire, which was touching the other bare wire. If I pull the IAC, it will sputter and almost die. I tried pulling the MAP connector, and the idle changed. Not significantly worse, but it definitely changed. My understanding is without the sensor it gets 5v to the signal wire? I've pulled the #1 plug and checked the TDC on the balancer a few times. Every time it always lines up to what looks like the TDC mark, and the rotor points at 12 o'clock. I also tried purposely stabbing the distributor "one tooth off" in each direction, and then 180 degrees off just to check. It hold the 14 degrees I have set with the spout removed, and if I plug it in you can see the computer take over timing and move it. I bought this car from a co-worker earlier in the year. He was the only owner, but this car spent the last 8 years sitting in a parking lot on base. He would move it from spot to spot once every month or so. I did a basic tune-up before I drove it home(plugs, wires, cap, rotor, fuel filter), but I honestly can't remember if the idle was this jacked up before I started messing with it. I do remember the idle hanging high every time I came to a stop. I pretty much did everything all at once. I immediately did a 5 lug conversion and then changed all fluids, replaced all vacuum lines, new battery, full exhaust, EGR/smog delete, replaced every single sensor, upper intake gasket, 70mm TB, 3G alt, fuel pump. I then started trying to single out this idle issue. [/QUOTE]
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