Rich and lean craziness

[SmilesPerHour]

I reset the ECU as I changed the pump, so it should have been expecting a working pump.

I opened up the TPS and saw a fair amount of oil pooled up in it. A water-park for electrical gremlins basically. =p





I didn't bother sealing it back up and even added a hole on the underside for future oil to drain through.

[packratbimmer]

Drive it for a bit and see if the ECU adapts back to proper fuel supply. Glad it worked out!

[SmilesPerHour]

I got the new pump installed today and now it certainly feels a lot more powerful and has that get up and go it lacked before. It's never ran this good!

On a side note, I also noticed the engine hesitates b/w idle and a little throttle. But not in the middle to high range. That's new. I guess my TPS decided to give me troubles too. Typical! ;p

[packratbimmer]

Hope you have it up and running soon!

Cheers

[SmilesPerHour]

Thank you so much for the help!

[packratbimmer]

Yea - I had a bad pump that would work great until I got to wide open throttle. It just could not deliver the fuel. It finally went kaput at the post office one day.

[SmilesPerHour]

Are you jumping the relay to actuate the pump? How long is is buzzing?

I built the jumping thing with the fuse and toggle switch. It buzzes for as long as the toggle switch it turned on.







I guess a new pump is in order?

[packratbimmer]

Are you jumping the relay to actuate the pump? How long is is buzzing?

[SmilesPerHour]

Do a fuel delivery test per Bentley instructions. Basically measure fuel into a jar for a given duration. I can look it up if you do not have a manual. You might have good pressure, but not enough fuel.

I followed the instructions in the bentley manual.

And when I switch the fuel pump on, I clearly hear a buzzing sound but nothing comes out into my container.

The fuel pressure regulator is new and the old one looked perfectly fine inside.

[packratbimmer]

Do a fuel delivery test per Bentley instructions. Basically measure fuel into a jar for a given duration. I can look it up if you do not have a manual. You might have good pressure, but not enough fuel.

[SmilesPerHour]

Not unless your battery was completely dead, but then you wouldn't be able to start it.

I would do a smoke test and check for vacuum leaks. Also pull your cap and rotor and check them out.

I'm not sure how to do a smoke test but the intake boot and valve house vent hose are all new.

And if I unplug the vacuum hose from the fuel pressure regulator to intake manifold it sucks like crazy and the engine sounds like it's quite unhappy.

[AndrewBird]

Not unless your battery was completely dead, but then you wouldn't be able to start it.

I would do a smoke test and check for vacuum leaks. Also pull your cap and rotor and check them out.

[SmilesPerHour]

Would a bad alternator cause these kind of problems?

[SmilesPerHour]

Okay, so I swapped in some known good injectors and a brand new Bosch O2-sensor. But the issues persists.

The engine feels utterly gutless when pushed. It revs slowly up to 5000rpm and cuts out. And then longer you drive that rev limit drops lower and lower. It cut out at 3500rpm after 10min driving.

I'm back to square 1.

Possible causes;

1) Problem is b/w the steering wheel and seat.
2) Bad crank position sensor (CPS)
3) Blocked catalytic converter
4) Broken rocker arm, valve spring, etc
5) Fuel pump relay
6) Injector loom connection
7) Throttle position sensor (TPS)
8) ECU

[SmilesPerHour]

I emptied out all the old gasoline before I started working on the fuel system.

Alright, a new Bosch O2-sensor is ordered.

I'll report back in a week or two when I've got it installed.