Good day. I finally got to the point where I found and fixed all the vacuum leaks on the 96 Bird that I acquired about 3 months ago. It idles well at 800 in park, about 650-700 in drive. The engine seems to run well at all steady RPM, but getting there is a different story. While giving it the gas, it does not smoothly accelerate and it rough. When holding at 3500 or so, it seems to run very smoothly. Drop the RPM to idle and all is as should be. It only runs rough when you push the pedal. I can't really take it out on the road yet because the tires are dry-rotted. I'm hoping to order some as early as tomorrow so then I really be able to see what she does on the road. I've only driven it about 5 miles total since I purchased it. Had to do a bunch of repairs.
I hooked up the scan tool and looked at the live data. At idle, the ignition timing is between 12 and 15 degrees, which seems about normal to me. While holding steady, it is also at 15 degrees. In fact, the timing never goes above 15 degrees, which seems like it's not enough advance. I could be wrong, but that's why I'm asking the question, which is:
What sensors send timing data to the ECM? I'm assuming cam and crank sensors? Is there anything else that might need checking or replacement?
Obviously I need to check the plugs on this car, they might be original. The wires have been replaced, maybe in an effort to fix the problem I'm describing. I'll have to pull the plugs and take a look, maybe that will shed a little light but I won't be able to do that for a couple of days.
I suppose valve timing could be an issue but I don't think it's likely. The car only has 95K miles on it. I suppose the chains/tensioners could be worn or faulty but I'm sure hoping not. I've never done chains on a 4.6 inside the car and it wouldn't be something I'm looking forward to doing.
I hooked up the scan tool and looked at the live data. At idle, the ignition timing is between 12 and 15 degrees, which seems about normal to me. While holding steady, it is also at 15 degrees. In fact, the timing never goes above 15 degrees, which seems like it's not enough advance. I could be wrong, but that's why I'm asking the question, which is:
What sensors send timing data to the ECM? I'm assuming cam and crank sensors? Is there anything else that might need checking or replacement?
Obviously I need to check the plugs on this car, they might be original. The wires have been replaced, maybe in an effort to fix the problem I'm describing. I'll have to pull the plugs and take a look, maybe that will shed a little light but I won't be able to do that for a couple of days.
I suppose valve timing could be an issue but I don't think it's likely. The car only has 95K miles on it. I suppose the chains/tensioners could be worn or faulty but I'm sure hoping not. I've never done chains on a 4.6 inside the car and it wouldn't be something I'm looking forward to doing.
APP103 or 104, last look at the sticky. There's a list. Verify the gap on all plugs, they do not come gapped, regardless of what people tell you. if it will help, I can write a post on how to gap plugs properly, and use the little tool correctly.
