318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > Engine

Notices

Engine Tuneups, chips, wires, spark plugs.

.
» Recent Threads
1999 M-Sport For Sale
12-31-2023 05:10 PM
Last post by Coop540iT
03-23-2024 06:39 PM
1 Replies, 100,124 Views
Once again 318ti owner...
03-20-2024 12:39 PM
Last post by two30grain
03-22-2024 02:04 PM
1 Replies, 63,036 Views
What brakes do I...
03-20-2024 03:27 PM
Last post by huirtera
03-20-2024 03:27 PM
0 Replies, 60,270 Views
Reply Share/Bookmark
 
Thread Tools Display Modes
Old 01-27-2016, 08:19 PM   #1
Cape Bob
Junior Member
 
Join Date: Jan 2016
Location: Cape Cod, MA
Posts: 4
iTrader: (0)
Default 1996 318i 5 speed M44 engine runs on at higher speeds only

96 318IC M44 engine
92,000 miles 5 Speed


Engine runs on at speeds over 65 mph in 5th gear, you take your foot off the accelerator and the mpg (vacuum Gage) does not go to the left right away. It sometimes flutters but never shuts off the fuel right away.

At all speeds below 65 and even above 3,000 rpm it works perfectly. Higher rpm in lower gears than top have no problems.


Things I have done or checked.
Last was change the DISA o-ring, the old was flat in 2 places. Checked the DISA with 12 volts flap snapped shut. Sucked on the vacuum line from the bottom of the valve closed and stayed shut.


Cleaned the throttle body, cleaned the idle air control valve. Engine idles perfectly and runs perfect except on the highway and then only when trying to slow down.


The throttle cable appears to be fine at lower speeds and constant shifting there is no problems so I ruled it out.


I am currently stumped at what the cause could be. Fuel pressure? The fuel filter was changed a bit ago. Nothing had been done to the engine recent to the problem being identified. Any help would be greatly appreciated.
Cape Bob is offline   Reply With Quote
Old 01-27-2016, 08:37 PM   #2
booooost
Junior Member
 
Join Date: Jan 2016
Location: Calgry
Posts: 10
iTrader: (0)
Default

I would check the fuel pressure, maybe scan the obd.
booooost is offline   Reply With Quote
Old 01-28-2016, 03:47 PM   #3
bmwconnect
Senior Member
 
bmwconnect's Avatar
 
Join Date: Mar 2010
Location: Ottawa
Posts: 579
iTrader: (1)
Default

Scan it and check for pending codes
__________________
BarrieM/// BMW Tuner - OBD1 M42,M50,S50 Chips & OBD2 M44,S52,M52 Flashes .EWS delete for OBD1 M42 & OBD2 328 M52 EMAIL:info@midnight-tuning.com www.midnight-tuning.com Midnight YouTube Channel
bmwconnect is offline   Reply With Quote
Old 01-28-2016, 08:50 PM   #4
Cape Bob
Junior Member
 
Join Date: Jan 2016
Location: Cape Cod, MA
Posts: 4
iTrader: (0)
Default

Thanks for the info I did have the OBD scanned and there were no codes. Without a loss of power I was doubtful that the fuel pressure would be low. I am constantly looking for any vacuum leaks but have found nothing yet. The around town driving still has not deteriorated. I was hoping something would change to give some indication.

I was wondering if a dirty injector could stick open and cause the engine to run on? Thanks again for reading.
Cape Bob is offline   Reply With Quote
Old 01-28-2016, 10:07 PM   #5
bluoval6
Member
 
Join Date: Oct 2015
Location: Slidell, Louisiana USA
Posts: 89
iTrader: (0)
Default

A stuck open injector would likely cause a rich code, and a vacuum leak would set a lean code. Does the car have cruise control? If so, I would try disconnecting the cruise control cable at the throttle body. Perhaps the cable is binding and hanging the throttle open. Hope this helps.
bluoval6 is offline   Reply With Quote
Old 01-29-2016, 05:44 PM   #6
Cape Bob
Junior Member
 
Join Date: Jan 2016
Location: Cape Cod, MA
Posts: 4
iTrader: (0)
Default

Thanks for the suggestions.

I took the cruise control cable off as suggested by bluoval6, unfortunately no change. This is how it performed with the cruise cable off.

At 65 mph about 3000 rpm it ran on for a few seconds never slowing at all till it bucked a little then started to slow.

At 70 mph, about 3200 rpm it ran on for a long time. Finally I hit the clutch and the rpm's increased. It started to slow after quite a few seconds.

Afterwards in traffic it seemed to take a long time to go from 1000 to 750 rpm or normal idle.

Would a stuck open idle control valve cause these symptoms? It seems to only be happening when the secondary air is in use. Any suggestions what about the throttle cable? I would think that would be problematic at any speed.
Cape Bob is offline   Reply With Quote
Old 01-29-2016, 09:56 PM   #7
bluoval6
Member
 
Join Date: Oct 2015
Location: Slidell, Louisiana USA
Posts: 89
iTrader: (0)
Default

A sticking IAC would be my next suspect. I believe secondary air only runs for the first few seconds after a start-up. Did the issue start when the weather turned cold? It's my experience that IAC valves like to act up more in cold weather.
bluoval6 is offline   Reply With Quote
Old 01-29-2016, 11:25 PM   #8
Cape Bob
Junior Member
 
Join Date: Jan 2016
Location: Cape Cod, MA
Posts: 4
iTrader: (0)
Default

bluoval6 You are the best that was it. I immediately disconnected the electrical plug and headed for the highway. Problem is completely gone. It does not idle any different it just shuts the fuel off more abruptly. The IAC must be stuck open when energized, it can't be open without power or the problem would not have gone away. It did have a spring return I noticed when cleaning it. I had cleaned it a couple of times because I suspected it too. Just never thought to disconnect it and try it. The car up until the last 2 years was in Massachusetts now it is living in Florida with only part time use. It worked fine till 6 months ago when I was taking a highway trip, and it started to not slow down. Using it mainly around town I never got around to getting it fixed. Thanks again for the solution. Now I have to install a new set of tie rods and it will be back to 100%. Such a fantastic car and a vert to boot. Bob
Cape Bob is offline   Reply With Quote
Old 02-01-2016, 03:23 PM   #9
bluoval6
Member
 
Join Date: Oct 2015
Location: Slidell, Louisiana USA
Posts: 89
iTrader: (0)
Default

Glad to help!
bluoval6 is offline   Reply With Quote
Reply

Bookmarks


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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
S54 engine into late model E36 swap (same 318ti) Hakentt-MS41.1 Engine Swaps 11 11-03-2015 05:08 PM
Engine hesitation or jerk under load higher speeds Caliburnes Electrical 3 04-03-2014 02:59 PM
F.S. BMW M42 (M42B18) engine fits e36 318, 318i,318is, 318ti chrisbec eBay and Craig's list listings 6 11-03-2010 02:21 PM
1996 M44 90k miles, vibration problem gabe3 Engine 1 11-20-2009 11:05 PM
1996 m44 dasc TROUBLE sabbath130 Induction 5 08-02-2006 02:13 AM


All times are GMT +1. The time now is 11:43 PM.


.
Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2024, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 86.75 k/102.85 k (15.65%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.