Lengthening Engine Loom (issues ?)
#1
TECH Enthusiast
Thread Starter
Join Date: Jan 2004
Location: New Zealand
Posts: 608
Likes: 0
Received 0 Likes
on
0 Posts
Lengthening Engine Loom (issues ?)
Hi,
I'm helping a guy out who has transplanted an LS1 into a boat.
He has had the loom proffesionally lengthened buy 25 feet so the PCM can be located in the cabin (I personally would not have gone that route).
Anyway, got it fired up and noticed MAP at ldle is reading low (30 kpa) as is the idle RPM (target is 800rpm , only reads 550 rpm)in EFIlives scan tool.
but is definatly idleing around 800rpm just reading low in the scan tool.
So would all that extra loom length possibly cause lower readings at the PCM ?
Will check MAP Kpa key on engine off, tomorrow .
I'm helping a guy out who has transplanted an LS1 into a boat.
He has had the loom proffesionally lengthened buy 25 feet so the PCM can be located in the cabin (I personally would not have gone that route).
Anyway, got it fired up and noticed MAP at ldle is reading low (30 kpa) as is the idle RPM (target is 800rpm , only reads 550 rpm)in EFIlives scan tool.
but is definatly idleing around 800rpm just reading low in the scan tool.
So would all that extra loom length possibly cause lower readings at the PCM ?
Will check MAP Kpa key on engine off, tomorrow .
#2
I'm new to the SBC crowd, so I don't know the PCM logic. However, 25' is a very long wire, and I'm sure has a pretty high resistance. I would check for voltage drop between the sensor and the PCM.