Ok,i'm a pretty good trouble shooter but.....(ABA turbo content/c2/obd1)

[Daskoupe]

First off car is obd 1 2.0 running c2 stage 2.

Car ran great never lean,no issues.

Then one day anything over 15psi its so lean it misfires.

So being the technician i am i check some things out

All ign components are new and OEM.Plugs are gapped right.
According to the wideband car has plenty of fuel right up to 15psi.
Now 15psi is where the boost takes off to 22 psi in about a second.I've always had the meth come in around here to keep if from leaning out.

So i get back to the shop and go hey i know the ebay walbros arent the best(mine does say walbro on it and made in the usa so idk if its a knock off)

Hook up a fuel pressure gauge.Fuel pressure on the stock fpr is around 35 at idle and 50 at WOT.
Hmmm.

At this point i know i was having a fuel issue more then a spark.

I put in a 4.0bar and pressure were much higher.Idle was around 43psi and pegged my gauge out(60psi) at WOT.
Now car runs,i mean runs(3rd,4th pull afr was 11.8 at 6600rpm!)But with the 4 bar its got some ****ty 3/4 throttle drivability other then thats its great.But i would like to know what caused me to have change my setup

So is my pump ****ting the bed slowly?Because i have no clue otherwise

PS:intake helper pump is new and properly attach to the fuel pick up.

PPS:Also i have a 1.8t fuel filter pre walbro could that be an issue?

PPPS : the pump is noisier some days then other.Does not matter on tank level

and finally pic for click
my last dyno

[GTijoejoe]

once upon a time before all these ABA management tuners were around I ran a TT turbo chip (most dont even know these existed) on #30 injector setup. Running like 8psi never had a single issue for over 1000miles for months.... and than one day all of the suddent it wouldn't even run because it was so rich. When to dinner came back out and this was the issue upon driving home.

I couldn't figure out what the problem was... took it to NGP and they couldn't figure out what the problem was... eventually I kept the chip, ran stock injectors and a BEFI FPR.... than the car ran again....

The problem was always a mystery... some type of freak glitch.... we spend many weeks checking things but no cause was ever found. I hope this doestn' happen to you.

[Daskoupe]

once upon a time before all these ABA management tuners were around I ran a TT turbo chip (most dont even know these existed) on #30 injector setup. Running like 8psi never had a single issue for over 1000miles for months.... and than one day all of the suddent it wouldn't even run because it was so rich. When to dinner came back out and this was the issue upon driving home.

I couldn't figure out what the problem was... took it to NGP and they couldn't figure out what the problem was... eventually I kept the chip, ran stock injectors and a BEFI FPR.... than the car ran again....

The problem was always a mystery... some type of freak glitch.... we spend many weeks checking things but no cause was ever found. I hope this doestn' happen to you.

thanks lol me too.I did make another engine harness(for looks mainly).So i'll put that in just because.But i know i've never changed the maf,so i might try and find a slightly newer one lol

[TheArtfulDubber]

Why is it spiking from 15 to 22 psi? What are you using for boost control?

[Daskoupe]

Why is it spiking from 15 to 22 psi? What are you using for boost control?

thats just went it really takes off(4400rpm then hits full boost at 4800).It hits 22 and holds like a champ

[TheArtfulDubber]

thats just went it really takes off(4400rpm then hits full boost at 4800).It hits 22 and holds like a champ

Ah, gotcha. I read that as part of the symptoms. Carry on.

[masterqaz]

Fuel filter......

Pumps do start to loose steam over time, working an older pump like that can cause issues like this. Wallys only help reduce load on the other pump.

Filter first then check pumps.

Also, bad seals on the Fpr can cause an internal bleed off back to the tank, Pressure and flow go hand in hand, Their are velosity/friction losses associated with higher flow rates but if its bleeding past to tank it can over work the pump trying to maintain the higher pressure. Kinda like a boost leak causes turbo over speeding and eventually a surge when it runs past the surge line. In your case fuel cut as the pump can no longer sustain and produce more flow rate to match the higher fuel requirement (pressure)

[Daskoupe]

Fuel filter......

Pumps do start to loose steam over time, working an older pump like that can cause issues like this. Wallys only help reduce load on the other pump.

Filter first then check pumps.

Also, bad seals on the Fpr can cause an internal bleed off back to the tank, Pressure and flow go hand in hand, Their are velosity/friction losses associated with higher flow rates but if its bleeding past to tank it can over work the pump trying to maintain the higher pressure. Kinda like a boost leak causes turbo over speeding and eventually a surge when it runs past the surge line. In your case fuel cut as the pump can no longer sustain and produce more flow rate to match the higher fuel requirement (pressure)

I'll try that

[Daskoupe]

well updating this.
The car is still running strong with the 4 bar.
i changed to a mk3 2.0 filter,and that might have made difference or maybe the weather.
But either way its now hold steady around 11.6 all the way to redline.So it does Seem to be a bit richer.

[mk2golf14s]

i have had weird things like that happen to me. it almost seems like the ecu is adapting for the worst. usually when the pump gets louder it because the pump supplying it is not keeping up very well. ive noticed that when i turn up my fuel pressure my inline cis pump gets quiet because since it lowers the amount it can flow, the pump in the tank is able to keep up.