Precision Turbo and Engine BigStuff3 GEN3 PRO SEFI System Hardware & BigComm Software - Manual (Page 133)

BigStuff3 Pro SEFI System
Version 2.1 – February 2011 125
o For Ford Modular COP engines the UEGOR value in the Dash must read 28. If a
number other than 28 is being reported, the cam pulse is occurring at the same time as
the crank pulse. For more information on how to resolve this issue contact BigStuff3.
o The ECU may be in Clear flood Mode. Make sure the TPS sensor reads near 1-2%
when the throttle is closed and near 100% when fully opened. If it reads near 100%
when closed, the ECU is in clear flood mode and is not injecting fuel. Swap TPS pins
A & C in the TPS connector.
o Make sure the crank sensor is connected.
 The LS1 Cam sensor connections are:
 A – Signal
 B – Ground
 C – 12V
 The LS2 cam sensor connections must be (terminals A & C are swapped):
 A – 12V
 B – Ground
 C – Signal
o The rev limiter (Engine Saver) On & Off values are not correctly set. The engine may
not run if there is no band between the On and Off limits, or the RPM inputs are
reversed! For example, if the “Rev Limit On” is set for 7,100 RPM and the “Rev Limit
Off” is set at 7,300 RPM the engine will not run
 My engine timing does seem right, what should I check.
o Make sure the firing order is correct.
o Both the BS3 GEN3 main wiring harness and the MSD ignition system must be
connected directly to the battery!! If not, ground loop issues are likely to occur.
o For coil-on-plug applications, make sure the cam pulse is occurring at least 10 o
before
the crankshaft pulse. To determine what the crank shaft timing relationship is between
the cam and crank sensors; add the CamCrkAdv signal to the Dash. Make sure a value
greater than 1
o
exists (a minimum of 6
o,
but ideally a 10
o
window is needed).
Additionally, you can view past Replays (DAI) to check if a Cam Synch Error occurred
and what the CamCrkAdv relationship was during the pass. If the Replay indicates
Cam Synch Error “ON”, the cam pulse is occurring at the same time as the crank pulse.
For more information on how to resolve this issue go to the How To/Help section on the
BS3 website, then to Ignition System Setup Tutorial or contact BigStuff3.
o Make sure your pulses per rev in the Operating Configuration table is correct for your
application. For example, a four (4) magnet MSD crank trigger setup should have a
value of 4. An LS1 engine should have 24, a Ford Mod Motor should have 36, and
LS2/7 should have 60.
o For LSx COP engines, make sure the cam synch override box is not checked. The Ford
Mod Motor COP system must have the “Override Cam Sync Test box, checked.
 How can I check if my cam sensor input is setup correctly?
o From the main BigComm tool bar, go to the Individual Cylinder, them Individual Spark
table. In the cell for cylinder #1, type in the number 10, this represents 10
o
of spark
retard for cylinder number 1. With a timing light, check cylinder #1 timing. It should
be 10
o
less than the other cylinders at that RPM.
 What are the steps I need to take to make sure three (3) stage timing retard/boost control
functions correctly?
o There must be a value in each of the three timer cells
o Each value for the three boost stages must be higher than the prior stage.
o The DAE trigger wire must have 12V applied to it