96 850 N/A Running rich, white smoke, no codes

[misha]

Damper or regulator Different set-ups for different engine managements in '96 &'97.
Can you post a picture of it please?

[crisnumbertwo]

MVSCORE indeed abscate! Good call.

My car has a damper, which is basically a FPR without a return line to the fuel tank.
I'm not able to take a picture of my set-up at the moment, but have a couple stock photos to show the difference. I can upload a picture of my actual damper later if that's what you want to see.

This is a regulator, with a return line to fuel tank.

regulator.jpg (5.27 KiB) Viewed 1009 times

This is a damper, without the return line.

damper.jpg (17.86 KiB) Viewed 1009 times

[misha]

Nope.
Your fpr is back at fuel filter area(at rear passenger's side of the car),return line also.What you have at fuel rail is damper and it have nothing to do with fuel pressure.

Your car have Motronic 4.4 management.

[crisnumbertwo]

Ah. I just read some of your thread of your quest to discover that fact! Someone there mentioned that one should replace the damper if it is leaking fuel into the vacuum line, which I think was going on anyway.
I have tested my fuel pressure, and it was at 44 psi on the nose, which is normal right? Could the FPR still be messing with my air/fuel mix?
Is it the same FPR that goes onto the fuel rail on older models? These are the only ones I can find.
Thanks for pointing this out, my Chilton has been useless.
Just ordered diodes to do the SAS delete, but could be a while to get here.
EDIT: I will check vacuum lines for the FPR now too, since it could have leaked from there too.

[misha]

Damper DON'T have a vacuum line. Fpr have.Our dampers can only leak fuel outside via bad o ring where it connects to rail.
When it fails.....injectors are just getting louder.The clicking is louder.

Fpr which goes to our cars are smaller than on older models which have fpr on fuel rail.They are not interchangeable.

About sas system....if you don't have emissions control in your country,just plug the hole for sas valve,plug vacuum lines and disconnect air pump.Check engine will be ON because of it and that's it.

Vacuum lines on our fpr goes to charcoal canister,not to vacuum tree like on older models.Totally different set-up.These fpr almost NEVER fails,because they are far away from heat.

Your fuel pressure is normal.It should be 43.5psi on 1st prime before starting the engine,around 35 at idle and again....43.5psi at high revs(full acceleration).

[misha]

Your rich running condition is from o2 sensor code.
Did you reset ecu by removing negative battery cables,or did you reset codes via scanner in the process after replacing damper?

[crisnumbertwo]

The O2 code just came up yesterday, so I'm not sure if it was going out and making things rich before the CEL came on (it has been rich for a while).
The damper I have has a vacuum line, and the one that was in before did as well.
I cleared codes with scanner, and the battery was disconnected for about 30 minutes while I switched out the damper.
The vacuum elbow at the FPR looks fine upon quick inspection. I will have to take a close look soon to see if it has a fuel odor.
I tried to find one online, but the only ones I can find are ones at the fuel rail. Might be time to hit the junk yard, but it's a long shot.
I will do SAS when I have more time.

[misha]

Ok,i somehow missed this.
BOTH of those pictures are of fpr.
Damper have NO vacuum line.
Damper have only one port which connects directly to rail.
This is a picture of damper:

images.jpeg (4.83 KiB) Viewed 960 times

images-1.jpeg (4.64 KiB) Viewed 960 times

[crisnumbertwo]

Now I am confused.
I also have a FPR, in front of the RR tire, and a damper with a vacuum connection.
I bought Bosch p/n W0133-1660728
I didn't see any without a vacuum connection.

[misha]

Like i said before....dampers have NO vacuum lines and it must be exactly like on those pictures i posted.Dampers are ALWAYS made by Pierburg not Bosch and they are always OEM parts.Bosch don't make them.
Since previous one was the same (wrong) part,could be that previous owner installed wrong part.

Fpr on the back at fuel filter and damper on rail.

The part you have with vacuum line is just another one fpr because fpr can't be functional without vacuum line.