[Diy_efi] VN calais startup

[Mike]

Hi Jenny/Ron,

I have a VL and had a similar problem some years back, these are
some of the possible issues...

a.	Erratic in-tank low pressure fuel pump, which if not
	running acts a little like a choke for fuel supply
	until it warms up then runs fine.
b.	Air FLow Meter was the most common one, if you have
	lpg and ever had a backfire into plenum then this could
	have damaged the AFM. Or, the 'burn-mode' is not operating
	so the next time the engine is started, the ECU cant get a
	good 'zero' setting and hence overfuels quite a bit at
	low revs until the AFM signal 'settles down' after a few
	revs.
c.	Vapour lock in fuel rail
d.	Faulty injectors
e.	High resistance earth fault on ECU, causes flakey
	drive to injectors and would upset it at all revs but
	most noticable at small injector openings, ie at idle
	until connection warms up - depends where fault is.
f.	Faulty diode in alternator causing ac pulses on battery
	line - also most noticeable at low revs.
g.	Dirty fuel
h.	Faulty fuel pressure regulator - I had 2 of these in
	a row from a wrecker - found a good one, but bought
	a new one which works fine.

thats it for now,

rgds

mike


At 10:56 AM 21/2/2003 +0000, you wrote:
>Please can anyone help me?
>   I have a 1989 VN V6 Calais. The vehicle runs fine for drive ability but 
>is hard to start and idle is a little rough. Compression is good so are the 
>valves.  Does anyone have an idea or test procedures using basic tools.  
>This has not just started, it is a long term problem.
>      Thanks
>           Ron Kerr


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