dvls-7

Hey guys,
the problem im havin is that at about 3.5k-4.5krpm my air/fuel meter reads either lean or nothin at all which is from what i was told that its way lean, but after 4.5k it reads normal and i feel a bit of a surge almost as if a second wave of boost hits.....(best description) and it stays normal all the way after that......also im losing fuel like crazy, i have to fill up about every 3 days worse if i get on it a little. Any ideas or suggestions would be helpful...thnx

dvls-7

^

SaabGuy

Sounds like your secondary injectors may not be firing properly at 3800 rpms. Do a seach for 3800 rpm hesitation. It could be fairly easy to fix but just regrounging some of the electronics to the chassie.

dvls-7

thanx man....

dvls-7

Ok i did the search and checked the grounds....i regrounded everything.....but still having same problem...rite at 3.5k all the way to 4.5krpm my a/f gauge reads lean after 4.5 it reads normal....tps was recently changed along with injectors and fuel regulator...(stock).....anybody has anymore ideas or suggestions.....thnx

Josepi

If I get on the accelerator (which I normally do... ) I fill up about every 3-4 days after commuting (50-60 miles everyday). Are you using a stock boost gauge? How much are you boosting? Mods?

dvls-7

im not sure on the exact # of miles it is for my commute but i don't think im at the 50 mark round trip.....i have a autometer boost gauge and im runnin about 6lbs....

Josepi

Sadly, that's about the mileage that I get...the autometers aren't known for their accuracy, you should be boosting 6.5 stock, same goes with A/F gauges. Honest best bet would be to dole out the 50 for a dyno (try and get a few people to have a meet at a shop, I got a nice deal where I got 3 pulls for 50 bucks...) and see what a wide band says your doing. I don't trust the ones that read off of your O2 sensor, half the time they do read it's a little too late.

But if your curious, nothing would stop you from wiring your fuel pump to recieve a constant 12v signal, and seeing what your gauge says. Although I wouldn't keep it permantely this way, your mileage would just get worse.

Have you done the nice rewire of your fuel pump (relay and all)?

dvls-7

No haven't done that.....im plannin on gettin bigger pump and a after-market regulator along with other stuff related to turnin up the boost.....as for the dyno i have done one and ironically i have a dyno day setup for the end of this month.....i'll probably get into it more this weekend....get more in detail....maybe there is something that im missin....one way or another i'll get it....im determined as well as stubborn.....thnx again for your help

Josepi

Well ****...just reread everything...with a stock S5 turbo and no cats, you should be running more than 6.5 #s....

dvls-7

actually the exhaust system is also on my list to redo....im basically undoin all what was wrong with what the previous owner had done....