"whatuptkhere" (whatuptkhere)
06/24/2018 at 07:28 • Filed to: volvo
5
6|
"whatuptkhere" (whatuptkhere)
06/24/2018 at 07:28 • Filed to: volvo | 5
| 6 |
I had an excellently productive
evening.
I’ve been chasing an economy issue with this car for ages. Started using way more fuel (15L/100km, instead of the more usual 12L/100km) and it was proving impossible to hunt down.
Then I noticed the oil smelled somewhat like fuel - which made me instantly
think I had a leaking injector. The car was also hard to start when it hadn’t been run in a while, which I felt was a lack of fuel pressure issue (the 740 only primes on cranking).
To fix this, I put an injector service kit on, but once I’d finished, I realised that that wouldn’t account for the behaviour I was seeing.
The kit just fixes
leaks at the fuel rail and the manifold mating surfaces
, not internal leaks of the injector.
Regardless, I finished reassembling the fuel rail and tested it on the ground with a spare fuel pump. None of the injectors leaked under pressure; I wish I’d tried this before putting the kit on, in retrospect.
In any case the car now runs, so I haven’t completely destroyed anything by refurbing the injectors. I’m hoping that between this and installing a properly functional brake booster will solve my economy issues, through the injectors working better and the brakes not dragging. No idea if the brakes
were
dragging but in any case they shouldn’t be now.
pip bip - choose Corrour
> whatuptkhere
06/24/2018 at 07:43 |
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well done!
MM54
> whatuptkhere
06/24/2018 at 10:08 |
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740 turbo wagon is high on my list of cars to have - glad to see yours is coming along well.
Goggles Pizzano
> whatuptkhere
06/24/2018 at 13:34 |
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H ave you changed your fuel pressure regulator?
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whatuptkhere
> Goggles Pizzano
06/24/2018 at 18:39 |
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I haven’t! I might soon. It’s not leaking fuel out the vac port, anyway. Seems to w ork.
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Goggles Pizzano
> whatuptkhere
06/24/2018 at 18:53 |
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No leak sounds good. I have
n’t touched it (yet)
and it’s
a long shot but... the
check valve on the main fuel pump?
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whatuptkhere
> Goggles Pizzano
06/24/2018 at 19:04 |
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Certainly would explain the tough starting issues, but it wouldn’t explain the economy problem. I’m definitely keeping an eye on it. If I keep the car I’ll probably throw it new fuel pumps (and check valve) in the next year or s o.