Made some progress tonight!
Thread Starter
Member
Joined: Mar 2004
Posts: 113
Likes: 0
Made some progress tonight!
After doing many searches and reading threads until my eyes crossed I stumbled across the formula for recalculating the BPW for my 7747 for the larger Delphi's . After changing it, things started looking a bit better. I took a quick drive for a new dizzy cap and rotor with ALDL running and I was still a bit rich across the board. So while I was at Auto Zone a made another quick adjustment to the BPW. Well one of the guys who was working saw me on the laptop and wondered over for a look. To put it mildly, he was totally blown away that I could tune my bin right there in the parking lot. Gotta love that Prominator!
I took to much fuel out and although ALDL said that my BLMs were showing rich, the Blazer was a little difficult to start. No problem, a quick stop in a parking lot, load the previous bin back in and away I went.
I thought that I had replaced the cap, rotor and wires just a little while ago, but the evidence said otherwise. The cap contacts were fired and the electricity had started etching a notch in all of the contacts.
The new stuff made a difference, but probably not as much as another vacuum leak that I found. The idle was still a little high, so I lowered the IAC counts and that helped to smooth out and lower the idle speed.
After everything was back in place, I took it out again. This time I did a datalog, which I finally figured out how to attach! The results were interesting. Rich on the lower end and lean on the top. Hmmmmm backwards, time to dive into the VE tables I guess.
One other problem that I can’t figure out though, well actually two. The first is that something that I haven’t figured out yet, is causing the IAC counts (and idle) to remain high after I put the truck into drive and then back into park; or after I have driven it.....but not every time! Interesting to say the least.
The other problem is a very loud popping in the exhaust (almost like a backfire) after I goose it or accelerate hard then let off.
Anybody want to take a stab at this one? I’m thinking that the two problems might be related, but I haven’t learned enough....yet!
I took to much fuel out and although ALDL said that my BLMs were showing rich, the Blazer was a little difficult to start. No problem, a quick stop in a parking lot, load the previous bin back in and away I went.
I thought that I had replaced the cap, rotor and wires just a little while ago, but the evidence said otherwise. The cap contacts were fired and the electricity had started etching a notch in all of the contacts.
The new stuff made a difference, but probably not as much as another vacuum leak that I found. The idle was still a little high, so I lowered the IAC counts and that helped to smooth out and lower the idle speed.After everything was back in place, I took it out again. This time I did a datalog, which I finally figured out how to attach!
The results were interesting. Rich on the lower end and lean on the top. Hmmmmm backwards, time to dive into the VE tables I guess. One other problem that I can’t figure out though, well actually two. The first is that something that I haven’t figured out yet, is causing the IAC counts (and idle) to remain high after I put the truck into drive and then back into park; or after I have driven it.....but not every time! Interesting to say the least.
The other problem is a very loud popping in the exhaust (almost like a backfire) after I goose it or accelerate hard then let off. Anybody want to take a stab at this one? I’m thinking that the two problems might be related, but I haven’t learned enough....yet!
Last edited by Wingnutt; Apr 4, 2006 at 09:18 PM. Reason: Trying to attach datalog
Thread
Thread Starter
Forum
Replies
Last Post