Mechanics

POOR STARTING IN A MORNING, FUEL STARVATION P

2002 SAAB 9-5

2002 Saab 9-5 6 cyl Two Wheel Drive Manual 94000 miles

My Saab v6 Tdi 3.0 has an intermitant fault, the first part is after parking up overnight it can be difficult to start in the morning

The second more major part is that when I accelerate for the first 5-10 miles it has no acceleration it bucks if you put your foot down, the only way to drive is to accelerate slowly. When it has beenb driven for 10 miles it seems to be okay. Saab cannot find a fault as it behaves when it is with them. No smoke from the exhaust, I have had the fule filter changes and regul services. I have now added Miller fuel addative to the diesel and this seems to be slowly getting better. Any ideas? Any help or thoughts would be apprciated. When she runs right she is brilliant but it is worrying in a morning. On my way home each night it is normally fine. Many thanks

Jonatahn
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Jonathanwilson
September 23, 2009.




Hi there,

Thank you for the donation,
The hard start will be, if a glow plug engine a faulty glow plug or system, or if direct injection fuel metering for cold start, the next problem I feel is also fuel metering and may be related to coolant temp sensors, I feel that all the problems may relate to a fuel metering problem, diesel exhaust is a great diagnostic tool, basically white smoke is incomplete combustion usually due to a low compression, black smoke is over fueling and incomplete combustion normally due to faulty and leaking injectors, no unusual smoke is normally insouciant fuel supply, now the first thing that should be dome is have the injector pump run up on a bench calibration test bench, this will prove the pump fuel flow, pressure and metering at all given engine speeds, I would be looking at doing this next.

Mark (mhpautos)

Mhpautos
Sep 27, 2009.


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