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[The Red Baron]

ok, here goes,
3.0l with lpg(dissconnected). from 1st start up cold or hot it runs very lumpy, try to drive off & it will cough & splutter, no power for maybe about 5-10 seconds then it will rev as normal. only does it from startup. drives normally after.
ive changed the maf, the tps, the icv. even throttle body & plenumn. dont seem to able to find any vac leaks.
now, ive noticed that its worse when the sai pump is running.
do we have any ideas chaps. oh, no codes are shown or management lights come on at all.
regards, jon.
baffled. 

[05omegav6]

Beginnings of a hole in the sai plumbing

[The Red Baron]

Beginnings of a hole in the sai plumbing

was wondering that tbh. one way valve maybe but would have thought it would run rough all the time?.
 

[The Red Baron]

any ideas peeps. 

[The Red Baron]

now changed the sai pipework inc none return valve. still the bloomin same. really need some idea`s on this now. 

[The Red Baron]

now changed the sai pipework inc none return valve. still the bloomin same. really need some idea`s on this now. 

Please............

[JamesV6CDX]

Have you looked at live data? What is the plug condition/colour?

[Kevin Wood]

SAI is just blowing down the exhaust, so I would imagine it only gets worse with that running due to the extra electrical load. What about EGR? Tried blanking that off in case it's leaking?

Failing that, I would say that your fuel trims are drifting out, maybe due to a lambda sensor / MAF issue or an intake air leak, to the point that the idle mixture is so far off that it will barely idle. Often happens if you have a poorly mapped LPG system leading it astray. Are you running it on LPG at all at the moment?

Are you able to see live data?

[The Red Baron]

SAI is just blowing down the exhaust, so I would imagine it only gets worse with that running due to the extra electrical load. What about EGR? Tried blanking that off in case it's leaking?

Failing that, I would say that your fuel trims are drifting out, maybe due to a lambda sensor / MAF issue or an intake air leak, to the point that the idle mixture is so far off that it will barely idle. Often happens if you have a poorly mapped LPG system leading it astray. Are you running it on LPG at all at the moment?

Are you able to see live data?

no, not runnng on lpg. it wont, i suspect the tank solenoid valve is u/s again tbh.
do have a strong smell of petrol around on startup tbh.
as for live data, not really. 

[The Red Baron]

Have you looked at live data? What is the plug condition/colour?

light brown/white. not really crusty though. cleaned up well.

[Kevin Wood]

Ok, smell of petrol would indicate it's way too rich at startup, so fuel trims might be creeping up while running (maybe due to a leak of unmetered air) and then cause the starting issue as they are stored in NVRAM from the previous run.

Worth checking the LPG injector lines for any splits? That might well be why it's not happy on LPG, and they would introduce an air leak on petrol too.

[The Red Baron]

Ok, smell of petrol would indicate it's way too rich at startup, so fuel trims might be creeping up while running (maybe due to a leak of unmetered air) and then cause the starting issue as they are stored in NVRAM from the previous run.

Worth checking the LPG injector lines for any splits? That might well be why it's not happy on LPG, and they would introduce an air leak on petrol too.

But, i dissed the lpg injectors & put it back to petrol running only. was still the same. 

[2woody]

I've had exactly that from an unclean electrical signal from the crank speed sensor

.... and yes, SAI leaks will cause that, too. ( from the two short rubber hoses, usually )