boost lag and fuel economy question

[mike74]

dammit, agree with Rikko!

[mike74]

^^^ agree totally. You need to do a boost leak test to confirm there's nothing amiss...otherwise you're pissing against the wind. One other thing that springs to mind though is the MAF connector. Have you tried giving it a good clean out and maybe LIGHTLY sanding the contacts? Also when you push the connector back on, pull back the rubber boot and using a small screwdriver or the like push each contact fully into the connector.

[hunker7]

Don't think it's a boost leak but I'll test it. All the sensors seem to be working, I will check TPS sensor.

BTW, couple of days ago I noticed car fails to pick up revs when I start it, if I rev it, it's all good.

[Rikki Kitto]

Check, check and recheck I am just running down boost leaks after the car was mapped 3 months ago with no leaks, found 4 last week and am checking again on Saturday

[hunker7]

I'm literally out if ideas at this point.

[newsh]

Maybe Worth a try..
Have you checked for leaks on the vac line to the ECU?

[hunker7]

Worth putting OEM chips back in?

[hunker7]

Taking out the downpipe bolt didn't go that well (sheared it) even though I was careful. Car still runs like a piece of ****. Seems like it runs worse than with timing supposedly out.

I don't think exhaust is blocked because when it was blocked on my V6 at one point car slowed down as in its not able to get rid of all the exhaust fumes. Nothing like this with the S4.

[hunker7]

I didn't no, as I need to get 17mm socket (forgot it in London)

[Error404]

Have you checked for a restriction yet?

[hunker7]

One I have is pretty much new, bought a Bosch unit.

[newsh]

Do you have another FPR you can try?

[hunker7]

Tell me about it. At one point seems it's better and then it seems it's worse/same.

[newsh]

It gets weirder... You correct the timing and get less boost? Did you move the belt in the right direction? (sorry, clutching at straws..)

[hunker7]

Remember when you said floor it in 3rd@2000rpm and see when full boost is reached? And I said about 4200 rpm, now it won't go past 2.2/2.3.

I did find it, and no errors.