Got my kenne bell on with 42lbs injectors and a msd 2 bar map, got the truck running but it stumbles and falls on my its face. I have to 2 foot it to get it going, am I running to rich and should I plug my 1 bar back in until i get it tuned?
Help!!!
SUPERJETRUSS
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8,647 Posts
tune = gold. I have never dealt with the stock pcm not understanding a 2 bar, as I have ran 60lb on a stock pcm with a 2 bar and it drove, it was rich off the idle, but into part throttle it was "ok". As the 2 bar divides the injector by 2, so a 42lb injector with a 2 bar, the pcm reads a 21lb injector. For the last few 100 miles on my truck before I shipped it out, I ran a completly stock pcm, with no sct tune, and 60lb injectors on a 2 bar, and it drove fine. The 2 bar is the secret to the sct, as the pcm see's half the lb rating of fuel injector.
Fuel sync has a lot to do with this also, and plug gap. Espc if you have a cam.
Fuel sync has a lot to do with this also, and plug gap. Espc if you have a cam.
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53 Posts
now im just waiting to hear back from hemifever:waiting:
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984 Posts
I know, I was talking about the computer tuning, my bad.
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hemifever just called sending me out an sct tommorrow!!! awesome guy to deal with!!:mullet::mullet:
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8,647 Posts
cool beans, means you'll have the tuner by friday! ROck on brotha!
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53 Posts
got my tuner yesterday!!!!:mullet: downloaded the program that hemifever made, the install went smoothly. When I tried to start it, it would start up and die out, I had to keep my foot on the gas to keep it running. Checked my volts coming from my 2 bar map sensor it read .89 volts wtf:rant:, so I ordered a new msd 2 bar from summit.
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8,647 Posts
reset the engine code, and give it another try.
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I did with the old 2 bar, didnt make a difference so now im waiting for the new map sensor to come in to test that out
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984 Posts
Thats good to hear, you are almost set. Before you know it:drive:
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I cant wait!!!
Now how does this tuning thing work? I got the sct from hemifever with his base tune and downloaded it, what is the next step after I get my truck running?
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sounds easy enough.. im going to be datalogging with the lm2 is there any special programs needed besides what comes with the lm-2 to use to send him the info?
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3,018 Posts
Not sure about the Lm2, but my dynojet can export the log info to a text document or to excel as a spreadsheet. I'm sure you'rs has something similar.
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yeah. I cant wait to start messing around with it!! but first I need to get it running!! lol
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I know mine with a 2-bar MAP and stock PCM ran perfectly fine. So something must be up. Oh and ignore the CEL about the MAP sensor 5V, it's a common code with the 2-bar and with SCT you "should" be able to get rid of it. I know mine was easily fixed, but some people had problems getting it to go away.
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53 Posts
how did you get rid of the cel?
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8,647 Posts
I was using the dynojet, and yes, you can export the log into a text file, and send it off. Logging the tps, voltage, a/f and rpm, will really allow for a more detailed tune. There has to be a reason why the map sensor was working fine @ one point, and then it went to crap. From what I gathered, they are very sensitive.
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53 Posts
the reason why I think it smoked it because originally I had the 2 bar hooked up directly got 2.22 volts. Then when I tried running it, it ran crappy so I thought it was the map sensor and wired it in with the stock 1 bar, this is the only thing that I think could of smoked it
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2.22 is golden @ key on engine off.
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