87 running lean?

[glock35ipsc]

Originally Posted by crossy's son

Make sure you unhook the brown wire under the brake booster to advance the timing.

I did this recently to my converted 85. Only when I unplugged the brown wire, the truck died instantly. Any thoughts on that?

rfmaster - Would you mind taking a look at my thread when you have time? I'm having a surging issue at cruise. Thanks!

http://67-72chevytrucks.com/vboard/s...d.php?t=351755

[jesdude7789]

Originally Posted by rfmaster

jes

A handful of knock counts during acceleration I would say is normal. I think the only way we are getting to the bottom of this is to get some data logging. In TunerPro-RT you can enable data conversion by changing operation function from multiply to use look up table. This should take care of conversion.

//RF

Ok i got the data logging to work on Tuner Pro and recorded three sessions. The first and third one are probably the most useful. In the first one I am driving from my house to oreillys about 6 miles away and lasts about 15 minutes and then the third one is when i have to go to a different oreillys to get my parts and i end up hitting the freeway briefly. So what should I do now? would you like me to send you the files so you can look at them yourself?

Nothing really stands out other than maybe a bit of MAP sensor irregularities. At one point I am driving about thirty and the voltage goes down like my vacuum is increasing but I'm actually just cruising steady. it goes from about 1.5 down to .90 and then goes back up to 1.5 volts. Otherwise it seems normal to me. plus the knocking noise is still there at any speed, just harder to hear on the freeway unless i'm driving next to the center walls but still crappy feeling acceleration.

I hate to think this but it seems like the noise and power loss is from something purely mechanical like bad bearings, pushrods, lifters, or springs. I don't know what to do because this is my only form of transportation and I don't have the place or time to tear it apart.