Bimmerfest - BMW Forums

Bimmerfest - BMW Forums (http://www.bimmerfest.com/forums/index.php)
-   E39 (1997 - 2003) (http://www.bimmerfest.com/forums/forumdisplay.php?f=103)
-   -   What could cause a loss of power ???? (http://www.bimmerfest.com/forums/showthread.php?t=671866)

diggyd357 01-23-2013 12:50 PM

What could cause a loss of power ????
 
My 97 528i with 220k has been a project....its never not ran or had any major issues, its just an aging car. I've done all the usual preventative type stuff (transmission service, O2 sensors, CCV , alternator , belts and hoses, replaced a broken header and gaskets, front wheel speed sensor, new plugs, ect). I do believe I need a VCG as I had oil in the plug channels and the car will sometimes smoke a little bit. My concern is that my car used to really respond to the gas pedal. Now it seems that rather Im at 1/4 pedal or 3/4 pedal its picking up about the same. Its not so much "lagging", its just not responding with the same "oomph !!! " as before. What might cause this ? Thanks for taking the time !

edjack 01-23-2013 01:37 PM

You are at least 100k past the time to renew the VANOS seals.

Scan for any stored codes, too.

Fudman 01-23-2013 01:37 PM

The two things that would usually affect engine performance are the DISA and the VANOS. The DISA modifies the intake length and the VANOS adjusts the timing, both to increase low end torque. The 97 engine engine does not have a DISA and I think it has a single VANOS. The seals should be replaced to restore the variable timing system. See the Beisan website for more info.

diggyd357 01-23-2013 02:31 PM

Correct as usual Fudman ...no DISA (thank God) and a single vanos. I have the DIY so I guess I'll bite the bullet.... So it doesn't seem like a CAT issue ??? I guess Id rather vanos than cats money wise.

edjack 01-23-2013 03:36 PM

When the cats get bad enough, they typically cause random multiple misfires, due to back pressure.

One tends not to notice the performance loss due to VANOS seals, as well as failing cats. Do the cat rattle when struck with a rubber mallet?

A back pressure tester can be fitted to the pre-cat bungs.

hh3uunp 01-23-2013 05:04 PM

The first thing I would do is New MAF and Air Filter because they are cheap and very easy DIY. If that doesn't work start doing the vanos and hard stuff.

In my 540i my Maf died twice so the engine goes flat around 200 hp instead of 282 hp

diggyd357 01-23-2013 05:37 PM

MAF done about 6wks ago....air and cabin filters at the same time. I need to do the vcg so Im gonna go ahead and do vanos. Now , do I wanna do vanos seals or rebuild the entire vanos system ? I called an indy that I trust to check their price for doing vanos and vcg ....he says around $400 . Does that sound right ??? I know I could do it myself, but after parts and tools Im probably lookin at around $200. It may be worth the extra $200 for that warranty ....and plus it seems like a bit of a headache.
As far as my cats .... I don't know, I guess I'll grab a rubber mallet and give em a smack. What are the pros and cons of aftermarket cats ? I mean, if my cats were bad and I installed magnaflow or Walker cats would it be an improvement ????

hh3uunp 01-23-2013 05:52 PM

Any code? Could it be a vacuum leak? When you did the head gasket did you get the head milled Down? Heads can get warpped when they are taken off

diggyd357 01-23-2013 06:11 PM

Haven't done head gasket ...had a broken exhaust manifold header that I replaced. My cats look bad. the heat shields are just kinda hanging on for dear life lol....it looks like the previous owner maybe tried an adhesive to hold them (heatshields) on...from rattling maybe ??? Or they're spooging some whitish, rusty lookin crap outta them lol... I don't know man... its dark. I'll check again tomorrow, Im beat...long day. Thanks for taking the time everyone. I'll update soon.

diggyd357 01-25-2013 08:36 AM

Pulled the codes...
P0133 slow response (heated O2 sensor bank 1)
P0420 efficiency low bank 1 (cats ???)
P1423
P1421

Fudman 01-25-2013 09:13 AM

Quote:

Originally Posted by diggyd357 (Post 7333474)
Now , do I wanna do vanos seals or rebuild the entire vanos system ? I called an indy that I trust to check their price for doing vanos and vcg ....he says around $400 . Does that sound right ??? I know I could do it myself, but after parts and tools Im probably lookin at around $200. It may be worth the extra $200 for that warranty ....and plus it seems like a bit of a headache.

There are only two things you can replace on the Vanos (single or double). One is the seals, which are all bad due to the material issue. These must be replaced. The second is the bearings. These only need to be replaced if the Vanos is rattling, usually on cold startup. This is a bit more work. Another option is the Dr. Vanos, which is a complete rebuilt Vanos. It's just a straight swap. That's $250, after core charge, but saves about 2 hrs since you don't need to replace the seals or the bearings.

$400 sounds a bit low for a Vanos seal replacement. It takes me about 5-6+ hrs to do this job and I have done it multiple times. I cannot see anyone doing it in under 3 hrs, given the amount of parts that need to be removed. The parts (seals $60 + VCG & grommets $45) are over $100. That leaves less than $300 for labor. Here in NE, that'll buy you about 2 hrs of work. So it seems low to me.

Honestly, I would recommend doing the Vanos job yourself. Yes, it will take you 6 hrs but then you get to see the inside of your engine. For folks that don't get to do these kinds of things, it is kinda neat looking inside that I6. The only special tools required are the fan clutch tool and 32mm wrnech (~$30). You should have everything else. While the $250 savings is nice, the satisfaction is immense. :D This is my favorite DIY as the benefits are usually very noticeable. And the Beisan instructions are amazingly goof. A very high ROI!

diggyd357 01-25-2013 12:28 PM

Just ordered my vanos seals and vcg . Gonna be a busy couple of weekends....secondary air pump trouble shoot this weekend and vanos seals / vcg next weekend......

Bandem 01-25-2013 05:11 PM

Report back on your experience after replacing the Vanos seals.

diggyd357 01-25-2013 09:23 PM

Quote:

Originally Posted by Fudman (Post 7337309)
There are only two things you can replace on the Vanos (single or double). One is the seals, which are all bad due to the material issue. These must be replaced. The second is the bearings. These only need to be replaced if the Vanos is rattling, usually on cold startup. This is a bit more work. Another option is the Dr. Vanos, which is a complete rebuilt Vanos. It's just a straight swap. That's $250, after core charge, but saves about 2 hrs since you don't need to replace the seals or the bearings.

$400 sounds a bit low for a Vanos seal replacement. It takes me about 5-6+ hrs to do this job and I have done it multiple times. I cannot see anyone doing it in under 3 hrs, given the amount of parts that need to be removed. The parts (seals $60 + VCG & grommets $45) are over $100. That leaves less than $300 for labor. Here in NE, that'll buy you about 2 hrs of work. So it seems low to me.

Honestly, I would recommend doing the Vanos job yourself. Yes, it will take you 6 hrs but then you get to see the inside of your engine. For folks that don't get to do these kinds of things, it is kinda neat looking inside that I6. The only special tools required are the fan clutch tool and 32mm wrnech (~$30). You should have everything else. While the $250 savings is nice, the satisfaction is immense. :D This is my favorite DIY as the benefits are usually very noticeable. And the Beisan instructions are amazingly goof. A very high ROI!


*******************
********************
When you say no.special tools needed ....what about the timing tools ?

diggyd357 01-25-2013 09:27 PM

Well...actually what you said was only special tools needed were tools to remove fan , which I have, and according to beasian diy I will need the timing tools .... Im just wanting to make sure I get everything that I need ordered . Thanks again !tools.....

ztitans1 01-27-2013 11:26 PM

When my VCG was leaking around the plugs oil would get on the plug itself and foul it out causing performance problems. I replaced the VCG and all the seals for the spark plugs and put new plugs and my 528 performed much better after that.

diggyd357 01-28-2013 04:37 AM

Quote:

Originally Posted by ztitans1 (Post 7342630)
When my VCG was leaking around the plugs oil would get on the plug itself and foul it out causing performance problems. I replaced the VCG and all the seals for the spark plugs and put new plugs and my 528 performed much better after that.

Definitely has crossed my mind.... I definitely have a leaky vcg and a couple deteriorated plug boots so this is a possibility. I plan on doing the vcg when I do vanos seals so I guess we'll never know what the actual cause was :cry: , but as long as it's fixed I'll be happy :bigpimp: ! I appreciate the inp:thumbup:ut

Fudman 01-28-2013 09:27 AM

Quote:

Originally Posted by diggyd357 (Post 7339003)
*******************
********************
When you say no.special tools needed ....what about the timing tools ?

Yep, I forgot you have the single Vanos. You will need the timing tools. There are also ways to jury rig locking the cams but entails a little risk.

Dackelone 01-28-2013 09:43 AM

Quote:

Originally Posted by hh3uunp (Post 7333394)
The first thing I would do is New MAF and Air Filter because they are cheap and very easy DIY. If that doesn't work start doing the vanos and hard stuff.

In my 540i my Maf died twice so the engine goes flat around 200 hp instead of 282 hp

+1. Just because its a new part does mean you have a GOOD part.

I would also replace the rubber boot going from the MAF to the throttle body/housing. They always crack and cause vacuum leaks.


Only other thing(s) is maybe your fuel filter(with built in fuel pressure regulator) and maybe fuel pump not delivering enough fuel when under load. ?

poolman 01-28-2013 10:09 AM

Vacuum leaks are the number one problem with power loss --check all point where this may be happening--The Vanos seal in your single Vanos system will need special tools to be fixed--but that will help tremondously with power also--Good Luck

ztitans1 01-28-2013 01:39 PM

+1 - Vacuum leaks definitely can be a culprit.


All times are GMT -7. The time now is 06:51 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms