Ok so here I go. I set the timing today, then did another lean drop on the carb. Once I did that I then went back and advanced the timing to about 10 degrees since I am at 6500 feet elevation. I tested the HAC and it was working great, cleaned it out a bit and put on some new vacuum hoses. So at this point i have rebuilt the carb, tuned it, checked almost all of the emissions systems, replaced most of the vaccum lines with new silicone lines, and replaced the PCV valve and grommet. I’ve also got pretty good vacuum. I’m seeing about 20 here at this high altitude.
The PO put on a new Cardone air pump, which I know are kind of hit or miss as far as working well. When I ran all the AI system tests from the FSM the air came out or did not come out of the right hoses, so it seems to be working, however I can't tell a flow rate. It doesn't seem to be blowing very strongly, but I don't know how strongly it needs to blow.
I went back and got my truck retested at the emissions place today and I failed again with high HC and CO. NOx passed. I drove it pretty hard before hand to heat up the CAT, (not the original CAT, but I don't know when this one was installed, it doesn't look terribly old) I had also put 3 bottles of heet in it before I tested it on friday, when it also did not pass, but that was in a full tank of premium, I had not had a chance to drive it around to run the tank down. I don't know the effectiveness of heet after 4 days.
So I came back and the first thing I decided to do is a compression test. Here are my numbers
1. dry 135
2. dry 130
3. dry 120
4. dry 130
5. dry 125
6. dry 70 wet 90
I didn't do a wet on the first 5 because i was pretty happy with those numbers, or maybe I shouldn't be? Soooooo...
What is the next step? I'm pretty bummed, but I def want to get it fixed. Never rebuilt an engine before, but I am not scared to try. The 2f seems pretty simple and I have the FSMs. This forum is also such a great resource. Thanks for any and all input!!!
The PO put on a new Cardone air pump, which I know are kind of hit or miss as far as working well. When I ran all the AI system tests from the FSM the air came out or did not come out of the right hoses, so it seems to be working, however I can't tell a flow rate. It doesn't seem to be blowing very strongly, but I don't know how strongly it needs to blow.
I went back and got my truck retested at the emissions place today and I failed again with high HC and CO. NOx passed. I drove it pretty hard before hand to heat up the CAT, (not the original CAT, but I don't know when this one was installed, it doesn't look terribly old) I had also put 3 bottles of heet in it before I tested it on friday, when it also did not pass, but that was in a full tank of premium, I had not had a chance to drive it around to run the tank down. I don't know the effectiveness of heet after 4 days.
So I came back and the first thing I decided to do is a compression test. Here are my numbers
1. dry 135
2. dry 130
3. dry 120
4. dry 130
5. dry 125
6. dry 70 wet 90
I didn't do a wet on the first 5 because i was pretty happy with those numbers, or maybe I shouldn't be? Soooooo...
What is the next step? I'm pretty bummed, but I def want to get it fixed. Never rebuilt an engine before, but I am not scared to try. The 2f seems pretty simple and I have the FSMs. This forum is also such a great resource. Thanks for any and all input!!!
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