PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

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Old Mar 1, 2008 | 03:54 PM
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Default Need some help

Well I just switched the car to a 2 bar with 60lb injectors, after flashing the ecu the car starts very hard. After it finally does start all you can smell is fuel, and it smokes badly, and shakes violently. I have the IFR scaled right for the injectors, and the OS for the 2 bar. Right now I'm at a loss for what to do, anyone have any ideas so I can get it running?
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Old Mar 1, 2008 | 04:34 PM
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Whats the map read.. key on, engine off??
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Old Mar 3, 2008 | 09:30 AM
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It reads 52kpa
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Old Mar 3, 2008 | 10:03 AM
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Lightbulb "Sumptin wong"..

Originally Posted by 2000RedZ
It reads 52kpa
The MAP should read near 100KPA, depending on the altitude when the reading was made.
A faulty sensor, incorrectly wired, incorrect/no recal after the install.
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Old Mar 3, 2008 | 01:30 PM
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Ok I was starting to think that it might be, could I install the stock one with a 2 bar os just to see if thats the problem?
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Old Mar 3, 2008 | 01:49 PM
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Did you "fix" the VE table after the 2-bar conversion?

What map sensor did you go with?
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Old Mar 3, 2008 | 01:50 PM
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Ya that was the first thing and it is one I got with my meth kit from Devils Own
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Old Mar 3, 2008 | 02:52 PM
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Be sure you are looking at the right MAP PID, I think
there's a new one that supplements the original when
you go to the custom OSes.

You may have to play some with injector offset value,
it's certain to be somewhat different than the stockers
but good luck finding any data; cut and try. You may
also need to shorten the minimum allowed pulse width,
see if you are bumping up against that and being forced
to overfuel as a result.
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Old Mar 3, 2008 | 03:08 PM
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If it shows you have 50ish kpa at key on engine off, then you have either the map scaler set wrong or you dont have a 2 bar map.
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Old Mar 3, 2008 | 08:37 PM
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Ya that was an old file sorry, also found that the VATS was turned on, turned it off and now it starts just fine, but then instantly dies no matter how much gas you give it. Now the map shows 0psi with the 2 bar.
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Old Mar 3, 2008 | 09:26 PM
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You'll probably have to post a copy of your tune on here
and/or
on the board for the tuning software you have.
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Old Mar 4, 2008 | 09:11 PM
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Ok messed with the car again and found that it is throwing a P1626, I deleted the code, and it still won't idle. Another thing is that when I put the VATS to either PWM or None, it will start and idle but it is very ruff and won't move, while it still smokes. If I put it to Serial it starts normal, sounds good but will just fall off and die right after it fires. I don't know what else to do now.
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Old Mar 5, 2008 | 09:50 PM
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Here is my tune, maybe someone can figure out what is wrong.
Attached Files
File Type: hpt
3rd turbo tune.hpt (456.4 KB, 76 views)
File Type: hpl
Won't start.hpl (17.6 KB, 88 views)
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Old Mar 6, 2008 | 09:37 PM
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Looks like the scan is all dead, until the very last second of the log, when about 400 rpms showed up for one frame. That frame also shows 183 kpa for the map, which would be about 12 lbs of boost...

Are you 100% sure you have a 2-bar map sensor in the car?
What was the part number on it?
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Old Mar 6, 2008 | 09:42 PM
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Seems like you should be getting around 100 kpa with the key on, but the engine not running. The kpa should drop even lower as the engine starts turning and starts pulling some vacuum.
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Old Mar 6, 2008 | 10:08 PM
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Lightbulb Yep..

Originally Posted by John_D.
Seems like you should be getting around 100 kpa with the key on, but the engine not running. The kpa should drop even lower as the engine starts turning and starts pulling some vacuum.
that's exactly what I told him.
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Old Mar 7, 2008 | 09:52 AM
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Ya I think the MAP sensor is bad just haven't gotten around to changing it, could I put the stock sensor in just to see if it will run.
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Old Mar 9, 2008 | 10:30 AM
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A stock sensor will also say to the pcm (like your log above), when you are first starting the car, "hey I'm in boost" gotta throw a bunch of fuel at it... It will flood and still be a no-start situation.

This is because a stock sensor will report the full 5 volts at key-on. Which now with your 2-bar OS, 5 volts means 15 psi of boost. The stock sensor uses 0-5 volts to represent full vacuum (0v) to full atmosheric pressure (5v).

The correct sensor for your OS will report 2.5v (or so) at key-on. Which your 2-bar OS now recognizes as regular atmospheric pressure. A working 2-bar sensor uses 0-5 volts to represent full vacuum to 15 lbs of boost, with normal atmospheric pressure in the middle of the range.
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Old Mar 9, 2008 | 03:12 PM
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Thanks I'm going to try to get a new map sensor this week and go from there.
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