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10-29-2016, 05:41 PM #1
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Merc 260---not firing the injectors
Ok guys, at a loss here. I have a merc 260 that is not firing the injectors. I have a brucato ACU and I've swapped the acu with my buddies, still get the same results.
Fuel pressure is good(39psi), voltage is good(12.6)all 6 cyl are firing and I indexed the fly wheel...I pulled the fuel rail and injectors to see if they're shooting gas...I only plugged two injectors up but they only spray once, sometimes, with the starter engaged about 6-7sec...
Any help would be greatly appreciated. Thanks in advanceALLISON XB2002
Merc 260
Hydrostream Vector-Sold
Nitro-Sold
Sylva deck boat w/ 225 merc-sold
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10-29-2016, 08:02 PM #2
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Check your harness ground.
Quartermaster
XB2002 W/S3000
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10-30-2016, 12:36 PM #3
Screaming And Flying!
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Injectors should have batt power on the red/yel wire, ECU grounds the injectors to fire them. Red/yel wire gets power from the starter solenoid.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-30-2016, 08:33 PM #4
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Outside power pack. It sends signal to let injectors know when to fire.
Nitrous is like a slut. u wanna hit it but you know there will be consequences.
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10-31-2016, 07:15 AM #5
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Thanks for all the inputs guys. I literally checked and double checked everything. My buddy read a forum with a similar problem and they said it was the switch box... so we swapped the injector wires to the back switch box and she fired up... ugh..
hope this will help someone in the future...ALLISON XB2002
Merc 260
Hydrostream Vector-Sold
Nitro-Sold
Sylva deck boat w/ 225 merc-sold
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10-31-2016, 08:35 PM #6
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Yeap i had it happen before
Nitrous is like a slut. u wanna hit it but you know there will be consequences.
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10-31-2016, 08:47 PM #7
Screaming And Flying!
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Couple switch box's 8s better than a ECU.
Originally Posted by bigbluechevy454
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
"So many idiots, so few bullets"
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11-01-2016, 06:52 AM #8
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No dought
Nitrous is like a slut. u wanna hit it but you know there will be consequences.
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