Sorry have to repost this as a new topic as I want to cross post this to other groups.
3 weeks ago i bought a Vauxhall Vectra 02 Model (last of old shape) LPG factory fitted. Engine Z18 XE.My 3 problems:
1] When driving at a constant speed or accelarating on both motorway and town on LPG or Petrol I suddenly at random interval (say every 5-10 minutes) lose all engine power so pushing the accelartor pedal to the floor gives no power. But If I then take my foot off the accelarator and put it back on then the power comes back instantly. Bit worrying at 80 Mph in the fast lane. I get no revs whatsoever until i re-engage.2] Wasting lots of fuel both LPG and petrol. I am getting about 3 miles to the litre in town traffic and about 5 miles per litre on the motorway. I have measured this by driving 200 miles on a full tank then filling up straight away back to full.
3] Engine electric light remains on, until reset. "Engine block in an amber light" on the dashboard. The car manual advises that it is a an engine / electrical problem.Had the following error codes come up on a Snap-On Graphing Scanner.
P0170 Mixture Rich PO134 Undocumented code P0571 o2 Undocumented code
There was also an old error code reported that was repaired by the previous owner: P0335 Crankshaft Position incorrect. This code looks like it was not reset.
Mechanic believes it is Thermostat as the engine temp never goes above
76 degrees, the thermostat is cutting in too soon. so even after half an hour of letting the engine rev the temp didnt go up.The Scanner was reporting that the o2 mixture before Cat on bank 1 was rich. The mechanic also stated that a particular o2 meter should switch between 200 and 800. However mine always stayed between 300 and 600.
Mechanic decided to change the thermostat/housing unit with sensors:
Engine light hasnt come on (after 10 hours).
Engine temp goes upto 90 degrees befor the thermo kicks in then rise to
100 Degrees and fan kicks in. The before cat mixture now switches (flip-flops) between rich and lean.Problem 1 NOT FIXED!!: On acclerating in LPG or Petrol i still lose all power until acclarator pedal is re-pressed from the top, ie let go off the pedal completley and repress the pedal.
Problem2 also Im not too happy with still seem to use a lot of petrol or LPG will report back with more accurate figures as i go on.
Problem 3 Light has gone off. :)
Any ideas on further fixing Problem 1 and 2. is it a GAS issue? even though it affects both fuels.