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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 12-05-2005, 05:41 PM   #61
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You can replace the straight rubber vacuum connectors with 7/32" and 9/32" vacuum hose (about $2 total for 1 ft. of each). The "Tee" coming off the throttle body has to come from your local GM dealer. I think I paid $2.80. gmpartsdirect.com wanted me to by a pkg. of 5 for about $0.90 less/ea. I probably should have done that in retrospect and then could have offerred the extras to others here. Ah well, hindsight....
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Old 12-05-2005, 06:41 PM   #62
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Quote:
Originally Posted by big_news_1
Hmmmm..... check out these two quotes from the 3800Pro thread I linked above:

Quote:
For most n/a cars, idle vacuum should read around 18-25" Hg. At WOT it should read between 5-0" Hg. You can learn a lot from a vacuum gauge, but I just keep a portable one around for use in diagnosing my family'* cars.
Don't be real worried if your on the lower side of that spectrum since you do have a bigger cam. But if your way off then more than likely you do have a vacuum leak.
Are you still going to get a different scanner?
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Old 12-05-2005, 07:49 PM   #63
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Alright...... got some info for you all.


First of all, my body decided to manufacture some testosterone, so I had the guts to fire the car up and take it out for a brisk run. Upon finishing that run, I'm convinced the car'* internals are perfectly fine and it'* running as smooth as ever. I'm also convinced that this scantool is no good at capturing data, and that I need to get an LS1M. Ideally a Powertuner would be nice, but I have neither a laptop nor the money to spend on the software. I just need the best bang for the buck that I can handle at this point. If anybody can locate a cheap Powertuner package for me I'll definitely consider it, but as of right now I just need a good, reliable scanner.

So, without further ado, here'* the MAP sensor data I collected. Keep in mind, this is from my AutoXray, and may or may not be correct.

Cold idle - 13-14 in.Hg
Hot idle - 13-14 in.Hg
2k RPM - 9 in.Hg
3k RPM - 8-9 in.Hg

WOT (in gear, under load) - 29-30 in.Hg


Not sure if my vacuum is where it'* supposed to be under load, but that'* what the scantool is telling me. Also, during the short times I was watching I saw no KR, and the scanner didn't register any during my data capture run. However, I'm not sure about reliability because I have a scan log that shows TPS at 100%, RPM at 4297, and only -20.5 degrees of timing advance. I just don't know if those numbers make sense.

Heck, I wasn't going to enter these numbers into Excel, but I might as well. Here'* the scan data. You tell me if the numbers look wonky or not.




Additionally, I ran to the parts store and grabbed some carb cleaner. Sprayed little bursts on all the vacuum connectors that might be problematic, but there were no stutters in the RPM. I guess that eliminates some options, eh?
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Old 12-05-2005, 07:59 PM   #64
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Ok. I'm convinced you should get the LS1M too. You should not be getting your highest vac reading at WOT. Man that thing is strange.
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Old 12-07-2005, 11:07 PM   #65
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Well, I had a bad misfire tonight that didn't go away. I didn't put the scanner on it, and I'm hoping its just a fouled plug. Will check tomorrow and let you guys know. Still don't have the AFC either . It should have been here by now, so we'll see if the guy makes good on his deal.

Cross your fingers and hope it'* just a bad plug!
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Old 12-08-2005, 02:49 PM   #66
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Quote:
Originally Posted by big_news_1
Well, I had a bad misfire tonight that didn't go away. I didn't put the scanner on it, and I'm hoping its just a fouled plug. Will check tomorrow and let you guys know. Still don't have the AFC either . It should have been here by now, so we'll see if the guy makes good on his deal.

Cross your fingers and hope it'* just a bad plug!
When I was running waaaay lean in the midrange, I had a couple misfires. I bumped up the afc and it want away.
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Old 12-08-2005, 08:21 PM   #67
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You sissy! Get out there and pull a plug or two!
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Old 12-09-2005, 05:41 PM   #68
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Well, still no AFC. Should have been here today, and I'm getting really antsy.


Other than that, I checked my misfire code and it turned out to be cylinder #3. Pulled the plug, and it was all black. All I had was a wire brush, so I scrubbed on it a little and put it back in. Car kept misfiring for a couple minutes after that, then cleared up while I was idling in a parking lot. At least that means all the internal parts are okay!

Hopefully I'll receive the AFC tomorrow, and install and tune on Sunday with a better scantool. After that comes a custom PCM, and then a dyno pull to top it all off
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Old 12-09-2005, 06:35 PM   #69
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All black? Thats not good. You should get new sparkplugs when you get the afc and start tuning.
Could you take a pic of the plug? I hope it'* not all oil fouled like mine was.
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Old 12-09-2005, 06:40 PM   #70
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Wife has the digicam right now, so I can't take a pic. I don't think it was oil-fouled. Head gaskets are new, heads were magnafluxed before milling.... it shouldn't be leaking oil anywhere. It was just a sooty black that came off easily with the wire brush. I'll try to get pics tomorrow.
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