backfire and loss of power - BMW Forum - BimmerWerkz.com
BMW Forum BMW Forum

» Auto Insurance

» Featured Product
» Wheel & Tire Center

Go Back   BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)
Register Home Forum Active Topics Gallery / Showroom Auto Loans Garage Search Today's Posts Mark Forums Read Auto EscrowInsurance

5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

BimmerWerkz.com is the premier BMW Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 02-22-2009, 06:13 PM   #1 (permalink)
n00b
 
Join Date: Feb 2009
Car:
Posts: 10
Photos:
nadeemkhan is on a distinguished road
backfire and loss of power

my 91 525i backfires and looses power on fast accelerations, uphill and around 50/55 mph. I had complete tuneup done with brakes and roter changed but no improvement...
nadeemkhan is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 02-22-2009, 07:08 PM   #2 (permalink)
Ich bin der Modifikator
 
johnnyBgood's Avatar
 
Join Date: Sep 2007
Location: Bayonne, NJ
Car: 97'E36 2.8 w/Optional Sport Package
Posts: 3,325
Photos:
johnnyBgood is a jewel in the roughjohnnyBgood is a jewel in the roughjohnnyBgood is a jewel in the rough
Garage
Quote:
Originally Posted by nadeemkhan View Post
my 91 525i backfires and looses power on fast accelerations, uphill and around 50/55 mph. I had complete tuneup done with brakes and roter changed but no improvement...
I would start by checking for leaks around the MAF Sensor, mainly around the intake boot, they are prone to dry out & crack, causing leaks! Also, I would try cleaning the MAF Sensor.....

http://i70.photobucket.com/albums/i9...s/b338c8e0.jpg

e36-tech.com | CLEANING YOUR Mass Air Flow Sensor DIY

johnny,
__________________
______________________________________
_______________________97 E36|Conforti Software|M50 Manifold|AFE|Borla|H&R| Bilstein |Eibach|Rockford|3.15 LSD
____________________________________________http://www.cardomain.com/ride/3129109
johnnyBgood is offline   Reply With Quote
Old 02-22-2009, 11:18 PM   #3 (permalink)
n00b
 
Join Date: Feb 2009
Car:
Posts: 10
Photos:
nadeemkhan is on a distinguished road
Thank you Jonny! that's lots of help especialy with pictures... I'll try it this weekend.
nadeemkhan is offline   Reply With Quote
Old 02-23-2009, 09:44 PM   #4 (permalink)
n00b
 
Join Date: Sep 2007
Location: Ca
Car: 92 E34, 99 E38 (goner), 90 E34
Posts: 33
Photos:
emiliomax is on a distinguished road
That is a cool idea Johnny. I'm also gonna try it tomorrow. I've been getting some misfires and hesitation when I first put it in gear. Thanks
emiliomax is offline   Reply With Quote
Old 03-26-2009, 01:07 AM   #5 (permalink)
n00b
 
Join Date: Feb 2009
Car:
Posts: 10
Photos:
nadeemkhan is on a distinguished road
...so I took it to a mechanic who found a bad coil and a bad hose. Both have been replaced. The car starts but runs very poorly feeling it is going to run out of power. Mechanic thinks it is the feul pump... Tomorrow, he will test the pressure and let me know for sure if it is the pump...
nadeemkhan is offline   Reply With Quote
Old 03-26-2009, 01:19 AM   #6 (permalink)
n00b
 
Join Date: Mar 2009
Car:
Posts: 15
Photos:
oldschool93 is on a distinguished road
hey, try cleaning the ICV, its a common problem with an easy solution
__________________
Cheeers
oldschool93 is offline   Reply With Quote
Old 03-26-2009, 12:38 PM   #7 (permalink)
n00b
 
Join Date: Feb 2009
Car:
Posts: 10
Photos:
nadeemkhan is on a distinguished road
What is an ICV and where do I find it? Last summer it had a complete tuneup and the fuel filter was replaced...
nadeemkhan is offline   Reply With Quote
Old 03-26-2009, 02:57 PM   #8 (permalink)
n00b
 
Join Date: Mar 2009
Car:
Posts: 15
Photos:
oldschool93 is on a distinguished road
Idle control valve, I am not sure where you would find it on your engine, here is a thread, there is no pics but thats what i followed to clean mine and i did fine. ICV cleaning instructions for E39 - Bimmerforums - The Ultimate BMW Forum

this one shows more pics but less explanation:
ICV Removal

i hope it works
__________________
Cheeers
oldschool93 is offline   Reply With Quote
Old 03-26-2009, 10:11 PM   #9 (permalink)
n00b
 
Join Date: Feb 2009
Car:
Posts: 10
Photos:
nadeemkhan is on a distinguished road
Thanks OldSchool! I'll try it when I get the car back this weekend. The mechanic couldn't test the fuel pump and he has given up after trying the following things:
Pull/replace spark plugs
Pull/Bench test coil packs and replaced 1
Checked wires, vacume hoses, MAF, intake for leaks/shorts
R&R (not sure what it means)
Clean MAF
Replaced air filter
Rewired ground to 6 coil packs
Chcked individual wires to coil packs and injectors
R&R IAC hose
nadeemkhan is offline   Reply With Quote
Old 03-26-2009, 10:50 PM   #10 (permalink)
n00b
 
Join Date: Mar 2009
Car:
Posts: 15
Photos:
oldschool93 is on a distinguished road
oh wow. you trust this mechanic? i cant belive he woudlnt think of this. give it a try and let me know how it goes. good luck.
__________________
Cheeers
oldschool93 is offline   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 5-Series (E12,E28, E34, E39, E60)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Loss of power eduardope 3-Series (E36) 20 09-26-2007 07:18 PM
power loss! bimmerguy82 3-Series (E36) 7 02-27-2007 11:59 PM
Power LOSS skawful 3-Series (E36) 4 08-09-2004 07:56 AM
Loss of power flipsgonetopless 3-Series (E21, E30) 10 08-05-2004 02:41 PM
Power Loss BlackEye 5-Series (E12,E28, E34, E39, E60) 6 08-21-2003 03:28 PM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -5. The time now is 01:45 AM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.3.2
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.