Author Topic: Fuel screw help! (Read 2516 times)

MontanaGTD · « **on:** October 26, 2007, 01:49:24 pm »

My car has been in for it MOT and after £411 of parts and work it passed! (steering rack, tie rods, tyres, lower ball joints & emissions)

The garage I go to is good at the mechanical stuff (mainly VW trained) but they just wound the fuel screw back to get it through the emissions - and played with the tickover screw to get it to run ok. I've taken it out for a run and it handles well but is totally gutless!]

How do I get it set back the same way as it was? As I have no idea how far they have screwed it back.

Can I screw the fuel screw all the way in to its tight and then screw it back by a certain number of turns? Originally I did the 1200rpm with the fuel screw at tickover and turn the tickover back down to 1000.

HELP I need more power!

rallydiesel · « **Reply #1 on:** October 26, 2007, 02:16:48 pm »

Here's how I do it:

Have someone sit in the car. With the car running turn the fuel screw in a quarter turn and briefly rev the car to 4500 rpm. The revs should drop right after the accelerator is released. Repeat turning the fuel screw in a quarter and blipping the throttle. Eventually, the revs will drop slower and may even climb after the accelerator is released. Now you can back the fuel screw out a quarter turn until the revs drop right after releasing the accelerator.

The reason you should have another person in the car is that when you reach that point where the revs start climbing out of control, you want to be able to turn off the ignition so you don't wreck your motor.

You will have to adjust your idle once you're finished because it will be higher than before.

Pretty simple actually.

carrizog60 · « **Reply #2 on:** October 28, 2007, 02:02:52 am »

i dont think 2 persons are needed, you can unplug the wire to the solenoid on the pump right?

rallydiesel · « **Reply #3 on:** October 28, 2007, 08:15:51 am »

Yes, you can do that too.

MontanaGTD · « **Reply #4 on:** October 30, 2007, 02:09:02 pm »

right - been at the car today - got under the bonnet, turned the fuel screw out until the revs started to climb by theself - then turned the screw back 1/4 of a turn. Pulls much better than it did when I got it back from the garage. But there is still a slight hesitation at about 4000rpm in 4th - it use to pull right round to 90mph in 4th before, but it wont do that now! Plus if i'm cruising at 70 and put my foot right down it doesnt pick up as quickly as it use to. And it use to smoke quite a bit when you floored it through the gears, now you hardly get anything! I've checked the pin to make sure they hadnt messed with that (they hadnt) and i've not done anything much else to it for them to play with (removed the boost controller for the time being - hadnt adjusted it any)

Anyone got any ideas? could the fuel screw be out too much??

rallydiesel · « **Reply #5 on:** October 30, 2007, 02:56:28 pm »

Once you find that spot where the revs just start climbing, you only need to back off the fuel screw a bit, not a full quarter turn. Just back it off enough so the revs drop down normally when you let off the accelerator. The adjustments get very sensitive at this point.

You can turn the smoke screw in a bit too to give it more fuel since that is something the mechanic may have backed out to pass emissions. It depends on how much smoke you want but most people don't adjust this since it doesn't add much power unless you have added a smaller turbo.

Are you sure they didn't increase the LDA spring tension (turned the starwheel out)?

MontanaGTD · « **Reply #6 on:** October 31, 2007, 01:21:47 pm »

They havent touched the fuel pin - i put a spot of red paint on it and it aint cracked!

Dont need to adjust the smoke screw really - its quick enough at the moment! I'm still waiting for my exhaust system to show up!