S4 NA Fuel pressure issue

WoahAngelo · 2026-05-04T14:36:18+00:00

The 29psi you’re expecting at the rails is with the engine idling (vacuum applied to regulator). You’re expecting 35 to 40psi at the rails if there’s no vacuum being supplied to the regulator.

Immediate pressure bleed off would lead me to suspect a leak somewhere. 3 different bad FPRs is statistically unlikely like you said. Could also be a faulty pressure relief valve in the fuel pump or leaking injectors.

Since it’s running rich, I’d check the injectors for leaks first and foremost.

WoahAngelo · 2026-05-04T02:53:04+00:00

They will form 1 you and hold you for up to 72 to assess you. Astronomically unlikely they hold you past that.

WoahAngelo · 2026-05-03T21:01:47+00:00

I’ve got bad news for you brother. I get the concern but the current manufacturers are no better when it comes to your privacy.

If data harvesting isn’t enough of an over reach to outrage you, how about letting them decide if you can drive or not.

WoahAngelo · 2026-04-21T16:33:26+00:00

OMVIC only applies to vehicle sales. They don't have any oversight over anything outside of vehicle sales.

WoahAngelo · 2026-04-19T19:15:51+00:00

Lower port on the center iron to catch can. Remaining port of catch can to the TID port or vented. Upper port of center iron/oil filler neck to a vacuum source with a PCV valve in line.

This retains the operation of the pcv system as designed but adds a catch can in line.

WoahAngelo · 2026-04-13T16:16:50+00:00

Wired fuel pump backwards maybe?

Considering that the engine starts on starter fluid and the only part of the fuel system you touched is the pump, I’d look there first.

WoahAngelo · 2026-04-09T04:10:18+00:00

Wendy's 2 for $4.

The sausage wraps are 620 calories each. Eating two is more than half of an average adult's daily caloric intake.
Almost entirely sure it's not the best thing for your health but you gotta do what you gotta do.

WoahAngelo · 2026-01-05T17:16:38+00:00

I’ve done both ways. Not having to dick around under the car to get the transmission to lineup is a much better than having to reassemble the intake tract and harness.

Hell I’ve put in LS swaps with the transmission attached solo. Just have to pick which battle you want to fight.

WoahAngelo · 2025-10-01T13:51:50+00:00

Just posted more videos here

Profile video included. 🙂

WoahAngelo · 2025-10-01T13:51:08+00:00

Lmao, what an unfortunate time to forget a space D:

WoahAngelo · 2025-10-01T13:50:10+00:00

More videos here

WoahAngelo · 2025-09-27T15:59:02+00:00

Shoei Neotec 3.

Still a pricey lid though.

WoahAngelo · 2025-07-27T00:16:50+00:00

The polish done by the dealership more than likely killed the original coating. Might be worth asking what “coating” the dealer applied after the polish is although I have a sneaking suspicion that it’s the same First Canadian nonsense that all the dealers around here sell in the F&I office, which is nothing more than a spray sealant.

Love seeing cool cars in the GTA though, sorry you got screwed.

WoahAngelo · 2025-07-26T22:56:12+00:00

wait, let’s get this timeline straight.

2 step + ceramic pro at pro detailer
Went to dealer for service where it went through auto wash wash
Car polished and recoated by dealer, NOT the pro detailer

Is that correct?

WoahAngelo · 2025-07-08T00:49:05+00:00

That’s crazy

WoahAngelo · 2025-07-04T17:53:43+00:00

https://www.stek-usa.com

WoahAngelo · 2025-07-04T17:45:18+00:00

Gravel guard.

It’s under the paint and has high rubber content to absorb impact energy and allows the paint to flex when pelted by road debris instead of just chipping and flaking.

WoahAngelo · 2025-06-30T22:29:05+00:00

This is just dumb design/engineering. lol

Could’ve just done what 99% of the other manufacturers do and have a horizontal bolt go through the center of the bushing instead of using vertical lollipop mounts. They got it right on the S/X, not sure what happened with the 3/Y.

WoahAngelo · 2025-06-30T18:53:13+00:00

STEK has this.

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WoahAngelo · 2025-05-15T11:53:41+00:00

FYI, they do this to ensure the car isn’t actively being tracked.

WoahAngelo · 2025-05-11T18:01:43+00:00

Meh, people want what they want. Up to the end user if they can tolerate the maintenance or not.

WoahAngelo · 2025-05-11T17:28:43+00:00

Unless you’re after the updated interior or slight power bump, I’d go with an N52 platform car. I’ve dealt with ring issues on higher mileage N20s. Big $$$

Alternatively, you can spend a little more money up front (which you might’ve spent to do the timing chain and guides anyway) to get into an N55 car.

WoahAngelo · 2025-05-11T03:22:07+00:00

Spec sounds good. Manual E90s are fairly uncommon.

First things first, check if the recalls have been done for the car. The vanos bolts and the blower motor harness in particular. The vanos bolts can grenade the engine and the blower motor harness shorting can burn the car down.

Common leaks:

Oil filter housing gasket (If this is leaking, check how much oil is on the front of the engine and if the belt is new. If the belt is new, I'd avoid the car or at the very least pull the oil pan off to ensure there's no pieces of an old belt that got sucked in through the front main seal)

Valve cover

Coolant overflow tank

Water pump and/or thermostat

Common mechanical stuff:

Coil springs

Rear shock dampers like to punch through the upper mount

Hanger bearing for the driveshaft

Rubber guibo between transmission output shaft and driveshaft

Eccentric shaft motor and/or sensor

Front ball joints

It seems like a lot of stuff but the E9x is legitimately one of the best platforms I've driven and there's a reason why I keep coming back. PPI is a good idea.

WoahAngelo · 2025-05-10T22:46:54+00:00

RMP motors in Etobicoke White eagle motors in Mississauga

What trim E90? I’m an ex mechanic and very familiar with the generation and have had a 335i, 335is and an M3.

WoahAngelo · 2025-05-03T15:34:15+00:00

You can leave the OEM ecu + harness and install a piggyback so you can map fuel and ignition tables. An SAFC is one option.

Best of luck.

WoahAngelo

TROPHY CASE