Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[PhilRich]

 Just finished installing the LPG system to my 2.2. Everything was fine before, apart from a Low Beam Fld/Vision fault which I was going to fix in due course. When I fired up the car after the install (LPG fuse not fitted), I found the engine to be a bit 'tappety' & on brisk throttle I was getting a mild backfire/spitback through the Throttle Body? I took the car for a run & found that if I drove like 'miss daisy' she responded OK and even accellerated gently upto 60+, but if I gave it heavy throttle the car seemed to have no power & was being held back as if I had the brakes on ? I have renewed the Inlet & Throttle Body Gaskets as a matter of course, new Bosch plugs, & have checked for loose connections, air leaks etc but can't find any. I am now getting the fault codes :
 P0335 - Crankshaft  Sensor Incorrect Signal
(01) - Present

P1700 - SVS request via CAN
(00) - Present

These codes come back again immediately after being cleared.


I have put 5 litres of LPG into the tank & run the system to check it operates, but the AC GasSyncro software shows no injection times for cylinders 2 & 3? is this related to the problems above and does anyone have any ideas what is wrong ?

[VXL V6]

Ignore the P1700, is the crankshaft sensor plugged in securely?

[Jimbob]

1700's are often logged instead of a 340 cam sensor too iirc...

check the cam sensor wiring 

[Kevin Wood]

I would double check the injector wiring to the LPG system. It should report a duration for all 4 injectors unless the main ECU has shut them down due to a misfire. (in which case you'd have misfire codes stored).

Kevin

[feeutfo]

I would double check the injector wiring to the LPG system. It should report a duration for all 4 injectors unless the main ECU has shut them down due to a misfire. (in which case you'd have misfire codes stored).

Kevin

easy to mix up those injector plugs   :-/

[Kevin Wood]

I would double check the injector wiring to the LPG system. It should report a duration for all 4 injectors unless the main ECU has shut them down due to a misfire. (in which case you'd have misfire codes stored).

Kevin

easy to mix up those injector plugs   :-/

Yep, been there. It'll run OK on petrol but as soon as you try to switch over to gas the ECU blacklists a couple of cylinders that aren't firing and until you restart it runs as rough as a bear's. Don't ask me how I know.

Kevin

[Lazydocker]

First things first... You did remember to connect the Main servo pipe to the manifold didn't you? Similar symptoms to those Tunnie and I experienced when I forgot it on his

After that... Check all your wiring thoroughly... Everything you touched first

[PhilRich]

First things first... You did remember to connect the Main servo pipe to the manifold didn't you? Similar symptoms to those Tunnie and I experienced when I forgot it on his

After that... Check all your wiring thoroughly... Everything you touched first

Hiya Paul 
If that is the 4mm hose to the spare brass injector I tapped in just below the Throttle Body butterfly that comes from the tee between the PS-01 (map) & the Vaporiser, then Yes!  I have double checked all the wiring/connectors. I had however, connected the LPG Injector Rail in the wrong order!!!! I've just had to call it a night as it's getting too dark too see properly (I can't see properly in bright daylight LOL ) but it runs on both Petrol & Gas at idle, and a quick run in the morning will tell if there is an improvement

[PhilRich]

I would double check the injector wiring to the LPG system. It should report a duration for all 4 injectors unless the main ECU has shut them down due to a misfire. (in which case you'd have misfire codes stored).




Thanks Kevin, just rechecked everything & you guessed it...LPG injectors connected wrongly  not had the chance to run the software again, but will try again in the morning. I will keep you posted. 

Kevin

easy to mix up those injector plugs   :-/

Yep, been there. It'll run OK on petrol but as soon as you try to switch over to gas the ECU blacklists a couple of cylinders that aren't firing and until you restart it runs as rough as a bear's. Don't ask me how I know.

Kevin

[PhilRich]

1700's are often logged instead of a 340 cam sensor too iirc...

check the cam sensor wiring 

Thanks Jimbob    I've checked all the wiring/plugs etc. I can't actually see the Crank Sensor for other components, but it looks a right PITA if it needs changing!

[PhilRich]

It's not my flipping day today! The Coolant Bottle sensor has thrown in the towel now  , oh well... C'est la Vie 

[PhilRich]

UPDATE: Checked all wiring, all appears OK. Still getting P0335 & P1700, these return as soon as they are cleared. Checked LPG install, refitted LPG injectors correctly this time? I am numbering the engine cylinders 1-2-3-4 from the front of the engine back to the scuttle & the LPG feed lines & Injector loom are connected in the same sequence? The car starts very lumpy & then settles down to normal idle on petrol but is a bit 'rattley' & with a bit of body vibration. If I drive the car on petrol, it responds ok to minor throttle movement when actually on the move, but hesitates when pulling away from a standstill, but if I increase the throttle too much it hesitates badly and dies completely if anywhere near 4000RPM!
When I activate the AC GasSyncro software, it now tells me there is no petrol injection to CYL1 but reads the others OK.  When I switch on the gas, I get the second from the bottom green fuel level light & a flashing green light below it & an audible beeping that repeats 4 times? but the software shows no changeover to gas or  data for the LPG injectors?
Gas Pressure reading is: 0.61
MAP is: 0.27
Petrol Injectors read: Injector 1 : 0.0
                                   Injectors 2 +3+4 : 3.7 to 3.8 steady

Gas Injectors all read 0.0
Temperatures :  Gas = 42
                          Red = 36
Lambda Voltage reads:  Lambda 1 = 2.49 to 2.57 fluctuating slightly either side.
                                       Lambda 2 = 2.45 steady ( this is not wired on a four pot?)
Battery Voltage : 13.71 to 13.78 steady at idle.
RPM : Between 780 & 800 steady.
All four LPG Injectors show active green.


I am stumped!  :-? Could this all be caused by a suddenly gone dead Crank Sensor?, a faulty/blocked  petrol Injector?
When I had the LPG injectors wrongly fitted yesterday, the software showed no readings for Petrol Injectors 2 & 3 but it DID switch to gas at that time!!! I could plainly hear the tank solenoid click open! Any ideas fellas, before I go looking for a length of rope?
                                 

[Lazydocker]

I assume you've now checked that all the piggyback connectors for the injectors are attached to the corresponding cylinders?

Sounds to me like the injector not getting a signal is unplugged/broken wire. I think I'd strip down and remove the LPG piggyback connectors, restoring the original car injector plugs to the right injectors and run it up.

[JamesV6CDX]

fully agree with LD

[feeutfo]

aeye, get it right on petrol first with lpg injectors unplugged from the car loom.