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Old 01-27-2012, 05:27 AM   #1 (permalink)
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Default 2008 DDiS Suddenly down on power, using more fuel

Hi everyone,

I have a "beige" (metallic gold, but it says beige on the rego sticker) 2008 GV with the f9q diesel that has suddenly developed a problem.

We went on a ~700km journey with 5 adults and luggage and averaged ~10km/L (according to the dash), we then did a quick ~200km journey with just 2 people and got ~15 km/L, then returned home with another ~700km and ~10km/L. Since then it has stayed around the 10 - 11 km/L mark.

We had it serviced after we got back (75000km logbook), and the mechanic said they didn't change the timing belt because they couldn't source one, and it was ~$300 when they could, and it didn't make a difference to fuel usage and drivability.

When driving, the car is very low on power for up to a second, before coming on boost strongly and suddenly, and goes like a cut snake up top (with ~20PSI, not surprising!) I bought a scan gauge and hooked it up and I am getting 15PSI driving normally and nearly 22PSI if I need to accelerate hard or hold speed up a hill on the highway. There are no ECU codes reported. I have tried disconnecting the battery overnight and there is no change.

Before this, we would get ~14km/L in town and 14.7 - 15 km/L on the open road, and boost would build slowly in a surge, not suddenly in a rush.

After a bit of reading, the VW pumpe duce 1.9 diesel is very sensitive to timing changes and has the same symptoms (Browser Warning), but the f9q is common rail. I am taking it to a diesel guru on Monday, but talking to him he didn't have any ideas what it could be, I did discuss timing and he will check that, but does anyone have any ideas about what else could be causing it?

Thanks!

James
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Old 01-28-2012, 03:51 AM   #2 (permalink)
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I also have 2010 GV with 1.9DDiS (F9Q) engine, and the fuel consumption averages are:

Town: 8L/100km (12.5km/L), but during winter short trips even down to 10km/L
Open road (80-90km/h): 6.5-7L/100km (14-15km/L)
Highway (120km/h): around 8L/100km (12.5km/L)
Highway (140km/h): around 10L/100km (10km/L)

Have in mind that fuel quality can also influence the consumption and performance.

Check also if tyre pressures are according to specification. If underinflated, fuel consumption is higher as well as tyre wear. If tyre pressure is higher, stability and traction is worse.

Experianced and good mechanic can with appropriate diagnostic tool also check a engine parameters values during driving, check if something is out of normal parameters and have a idea what might be wrong even without errors reported by ECU.

Last edited by Sigtran; 01-28-2012 at 04:02 AM.
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Old 02-07-2017, 10:56 AM   #3 (permalink)
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I have similar problem with my SGV f9q 2006. It seems to have low power and high fuel use, but every now and then, often after turning it off for a quick run to a store, it has more power and less fuel use, until I turn it off and on again. So far Ive checked DPF, EGR, oil filter, timing belt, catalyst converter, MAF censor and put new glow plugs in it, but still the same... so did you find a solution?
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Old 02-07-2017, 12:41 PM   #4 (permalink)
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Quote:
Originally Posted by Sigtran View Post
Experienced and good mechanic can with appropriate diagnostic tool also check a engine parameters values during driving, check if something is out of normal parameters and have a idea what might be wrong even without errors reported by ECU.
Well said, there is need for diagnosis, not the parts cannon...

I work on big engines (hyway), not these little guys..

I would be checking the waste gate and actuator on the turbo...

... Philip
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Old 02-09-2017, 04:52 PM   #5 (permalink)
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i had a similar problem with the power being hit and miss sometimes it was there sometimes it wasn,t so i bit the bullet and had the turbo taken out and refurbed and all reset and it runs a lot better now theres power there nowin mid range and its consistent i can now use the turbo boost to get it up to speed through the gears and the guys that did the turbo said the waste gate and the acuator would have been the issue
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