03-01-2013, 04:20 PM
You could really do with just logging the RP sensor voltage, ooor maybe via PP, at crank.
See if on these loooong starting cycles the RP is getting up or not.
As C2K mentioned, maybe a lazy lift pump? Or clogged and that too takes time to get some pressure up?!
Lift pump has a gauss filter which is easy to check. I'd probably do a fuel filter change just to be sure too.
Then get some diagnostic kit on to watch the sensor readings basically. Then you can go from there. Maybe the garage has a snap-on reader that can watch rail pressure while the car is running/starting. It should get up to 300bar and then start. If it's slowly creeping up to 50, then 100, then 200, then you know something isn't right there.
The fact it is sometimes 2s which is probably normal in winter, and sometimes 10s which isn't, then it's certainly something that can operate fine one minute but not the next.
Maybe a sticky relief valve due to being dirty? Maybe just the lift pump being lazy as was said?
Relief valve is fairly easy to clean.
Lift pump is easy to check.
Hardest one really is checking rail sensor value because it requires some electronic jiggery pokery hehe.
Dave
See if on these loooong starting cycles the RP is getting up or not.
As C2K mentioned, maybe a lazy lift pump? Or clogged and that too takes time to get some pressure up?!
Lift pump has a gauss filter which is easy to check. I'd probably do a fuel filter change just to be sure too.
Then get some diagnostic kit on to watch the sensor readings basically. Then you can go from there. Maybe the garage has a snap-on reader that can watch rail pressure while the car is running/starting. It should get up to 300bar and then start. If it's slowly creeping up to 50, then 100, then 200, then you know something isn't right there.
The fact it is sometimes 2s which is probably normal in winter, and sometimes 10s which isn't, then it's certainly something that can operate fine one minute but not the next.
Maybe a sticky relief valve due to being dirty? Maybe just the lift pump being lazy as was said?
Relief valve is fairly easy to clean.
Lift pump is easy to check.
Hardest one really is checking rail sensor value because it requires some electronic jiggery pokery hehe.
Dave