Cars dead! info provided

[meissen]

It sounds like the MAP is still not right. The MAP should go up as the load on the engine goes up and should drop as the load goes down. If your BAR is 17.65 and MAP is 3.25 then your vacuum is 14.4 which is about where mine idles... I know LS1s and LT1s are totally different beasts, though. What makes me more worried is the BAR going psycho. The elevation of Muskegon is about 650 feet above sea level so that means that your BAR should be reading right around 29 HGs. Your MAP sensor is what reads BAR when the key is on but the ignition is off so if it's fluctuating THAT much - to me it sounds like the MAP is still not right. BAR should never fluctuate unless you're taking a reading in two totally different storm fronts or something. MAP should always be about 1/3rd of BAR in a stock engine - modified, not sure. All the info is using what I've read on Fred's website (Injuneer.com)

We're giving it an hour for my mini9 to charge and then Angie and I are going to go datalogging on my car. I want to compare the values that you're talking about with the values that I get. We'll see what the differences are... obviously an LS1 is different than an LT1 but it shouldn't be THAT different IMO? BAR should be BAR, MAP should still be MAP, etc.

[1BADAIR]

Was it tuned speed density?how long did you let it run?

[meissen]

OK Larry - here's a comparison. Again, I don't know if this is totally apples to apples since I'm LT1 and you're LS1 but my BAR is 29.65 "HG while my MAP juggles between 15.5 and 16.5 "HG at idle. Hope that helps?

Edit: Pretty cool - I was paying attention to my vacuum and I was around 14 HG vacuum and if you subtract the MAP from the BAR you get about where my vacuum was reading.

Edit Edit: My IAC stays around 75-85.

[MP81]

for >20 Hg of Vaccum at idle.

That is all.

[OIF1VET]

Was it tuned speed density?how long did you let it run?

Not SD, car has ran long enough to come to normal operating temps.. All the wiring seemed to check out, going to get another MAP(free) and try again, maybe I am not getting it seated properly giving me all these bogus readings?

[98blackbeauty]

Hope that is it Larry

[1BADAIR]

what were the 02 voltages? the map is a pain to get in and out becaus the oring is tight and the tab that locks it in
watch the 02 volts because or make sure you are watching actual A/F and not commanded A/F

[OIF1VET]

what were the 02 voltages? the map is a pain to get in and out becaus the oring is tight and the tab that locks it in
watch the 02 volts because or make sure you are watching actual A/F and not commanded A/F

I was reading like 400 mv for the O2's.. Not sure what AFR it was reading, different scanner.. The one I am using does not check AFR.. Out to turn my arms even closer to pure hamburger meat.. Not looking forward to this.. Sure hope it fixes it..

[OIF1VET]

thanks Travis, I figured it out, Red 32.. Map sensor signal wire is broken.. No continuity whatsoever, notta... So when I have time, off comes the intake and time to do some wire repairs.. Thanks again for everyones input, advice, kind words, etc.. I doubt I will be ready for the metro cruise though.. Be working 10-11 hour days and Saturday, so probably won't dick with it much..