All Things Mk5 > How to Guides / Troubleshooting
Down on power?
JoshB:
Hi all,
Had my car on the Dyno yesterday and it didn’t make for good reading...
Car feels fine, pulls well enough. During the run there was a couple of puffs of black smoke from the back...?
Torque’s not a million miles away (although a tad late) but it’s well down on horsepower and at a low RPM.
Only audible note is a sucking noise on acceleration, I don’t have an induction kit fitted.
As I mentioned, the car seems to pull well enough. Part of me wants a 2nd opinion!
I’ve ordered a new divertor valve just in case. The only other thing I can think of is the CAT, the cars only done 20k in the last 8 years...
Any other ideas?
GVK:
Needs checking out on VCDS data logging etc, and fault codes.
May have a boost leak too hence the noise?
Decent fuel as well? 98 ron?
Sometimes can black smoke oif misfiring or pulling timing due to crap fuel.
Get some liqui moly fuel cleaner through it too, great stuff.
GVK:
I know you didn't want to mod it but a remap would give you 250hp and more fun once fixing whatevers wrong witth it to give factory 200ps.
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JoshB:
Cheers, it is still on supermarket fuel at the minute... Once that’s run through though it’ll be VPower only from then on.
It’s just the sudden drop off after 4800rpm that bothers me though. Not that I regularly drive it anywhere near!
GVK:
I rev mine to 7k all the time but then I'm a bit nuts
Fuel will do it they are meant to run on 98 minimum and if you have s diverter valve leaking that will lose power too
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