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civicious · 08-08-2004, 07:46 PM

I swapped a b16 into an 89 DX hatch, wired MPFI, plus everything for vtec. Tested wiring at plugs and at ECU with a multimeter, everything is wired up right. The car doesn't throw any CEL's, but vtec won't kick in and the motor won't rev over about 6800rpm. About a week ago, I disconnected the vtec wire at the ECU, ran 12v from the fuse block to a switch, then from the switch to the vtec wire. Vtec worked fine, and I ran a 15.30 with a CEL for the vtec solenoid (with the car still not revving over 6800). The ECU is a PR3-003

Any ideas?

liquid00meth · 08-09-2004, 03:28 PM

well since 6800 is the DX rev limit it sounds like your ECU doesn't know it's a vtec ECU, or for some other reason thinks it's DX ecu. If it was running in limp mode the rev limit would be much lower than 6800.

All the pr3s are b16 ECUs, so I don't even know how it knows about 6800 RPM??? Unless it does that when VTEC is disabled, but I have no clue. Since vtec isn't kicking on, which the ECU should be doing, are you sure it's not a DX ECU??

6800 rev limit, no vtec = DX??

civicious · 08-10-2004, 09:54 PM

its a pr3...vtec ecu...

and it works now. dunno why. it just up and started working.

fuckin' honda.

08-08-2004, 07:46 PM	#1
civicious FüK-VTEC Join Date: Jun 2003 Location: Houston, Texas Age: 23 Posts: 8,410 iTrader: 3 / 100% Ride: 07 Nissan Frontier, 90 CRX Si, 06 ZX6R racebike, chopped-out 02 Yamaha V-Star Rep Power: 189	I swapped a b16 into an 89 DX hatch, wired MPFI, plus everything for vtec. Tested wiring at plugs and at ECU with a multimeter, everything is wired up right. The car doesn't throw any CEL's, but vtec won't kick in and the motor won't rev over about 6800rpm. About a week ago, I disconnected the vtec wire at the ECU, ran 12v from the fuse block to a switch, then from the switch to the vtec wire. Vtec worked fine, and I ran a 15.30 with a CEL for the vtec solenoid (with the car still not revving over 6800). The ECU is a PR3-003 Any ideas? __________________ CMRA #265 http://www.myspace.com/civicious AIM: greyfades

08-09-2004, 03:28 PM	#2
liquid00meth Senior Member Join Date: Nov 2002 Location: Laconia, NH Posts: 3,201 iTrader: 0 / 0% Rep Power: 47	well since 6800 is the DX rev limit it sounds like your ECU doesn't know it's a vtec ECU, or for some other reason thinks it's DX ecu. If it was running in limp mode the rev limit would be much lower than 6800. All the pr3s are b16 ECUs, so I don't even know how it knows about 6800 RPM??? Unless it does that when VTEC is disabled, but I have no clue. Since vtec isn't kicking on, which the ECU should be doing, are you sure it's not a DX ECU?? 6800 rev limit, no vtec = DX?? __________________ "Our enemies are innovative and resourceful, and so are we. They never stop thinking about new ways to harm our country and our people, and neither do we." -The thought provoking George W. Bush

08-10-2004, 09:54 PM	#3
civicious FüK-VTEC Join Date: Jun 2003 Location: Houston, Texas Age: 23 Posts: 8,410 iTrader: 3 / 100% Ride: 07 Nissan Frontier, 90 CRX Si, 06 ZX6R racebike, chopped-out 02 Yamaha V-Star Rep Power: 189	its a pr3...vtec ecu... and it works now. dunno why. it just up and started working. fuckin' honda. __________________ CMRA #265 http://www.myspace.com/civicious AIM: greyfades


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no vtec, and motor won't rev over 6800rpm