Newbie LPG tuning $12P

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
V8_Cruiser
Posts: 1
Joined: Wed Aug 03, 2011 9:32 am
cars: 78' Landcruiser

Newbie LPG tuning $12P

Post by V8_Cruiser »

Aloha!

Would love some advice on why my lpg runs very rough. I'm currently using Map A for LPG, Map B for petrol and have setup a relay to trigger the Map_SW on the NVRAM when the gas lockoff is activated. It's a standard VR V8 Manual engine in my old 45' Landcruiser. Not really knowing my way around, I just copied the main petrol spark table to be identical in both banks to get it working. It's a vapour injection system, with a lpg piggy back ecu for fuel only and has never run properly on gas since I bought the ute - also worth noting the check engine light comes on when switched to lpg, and this never happened on the standard memcal before upgrading.

Petrol is running very smooth, but on gas the idle sounds rough, free revving sounds like not all cylinders are firing, and poor acceleration on the road.

I am very new to this, any help appreciated :)

Thanks!
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TTVN
Posts: 194
Joined: Tue Jun 30, 2009 12:01 pm
cars: TT 355 VN, Rearmount turbo 355 vp, cammed 355 hj60 landcruiser, vx clubby n efilive VZ ls1 wagon

Re: Newbie LPG tuning $12P

Post by TTVN »

it sounds like your gas system may be crook
have you tried to diagnose the missing eg crook gas injector or vacuum leak etc

if the engine light comes on
check to see what fault code it is throwing on gas it is probably an o2 sensor code but check it out

lpg runs very smoothly in general and will take a good amount more timing down low than petrol
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