318ti.org forum

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


Engine Tuneups, chips, wires, spark plugs.

» Recent Threads
1996 318ti M green, auto
05-06-2021 08:23 PM
Last post by FunElan
05-07-2021 08:23 PM
1 Replies, 1,571 Views
new to me 98 318ti
05-03-2021 04:16 PM
Last post by 1996 328ti
05-06-2021 12:47 AM
1 Replies, 1,292 Views
Crank timing
05-06-2021 12:19 AM
Last post by jmwilliams
05-06-2021 12:19 AM
0 Replies, 710 Views
1997 Black 318ti 5spd...
03-28-2021 09:11 PM
Last post by AustinTX
05-05-2021 03:41 PM
7 Replies, 2,973 Views
318 Track Day VIR
04-29-2021 04:30 AM
Last post by joe1602
05-05-2021 12:24 PM
1 Replies, 1,731 Views
Reply Share/Bookmark
Thread Tools Display Modes
Old 04-17-2021, 08:51 PM   #1
Junior Member
Join Date: Jun 2019
Location: Colorado
Posts: 6
iTrader: (0)
Default No start - "weak" spark, no codes, new crank position sensor

Hey all, A month or so ago when I tried starting my '98 ti, it fired a few times then nothing but crank. No codes were thrown. I've tried the following so far:

1. I sprayed carb cleaner into the throttle body, no difference.
2. Tested plug #1 and no spark
3. Checked DCM compartment, dry as a bone
4. Replaced the coil pack, no difference, returned it.
5. Replaced the crank position sensor (VNE, NOT genuine BMW); cranks but doesn't fire (my poor flayed hands )
6. Tested plug #1 today and recorded it (below)- it sparks brightly every few seconds but that's it - car still cranks but doesn't fire.

From what I understand, since it's sparking it's not the computer. What should I try next? Test the relays? Test fuel pressure? Compression test? Test the fuel pump? I can turn wrenches but I'm not much good with testing electronics.

I'm confused as to the change in sparking with no improvement after replacing the CPS unless the CPS and something else went bad simultaneously (or the CPS is junk). Any help is appreciated!

https://youtu.be/csHCHoFygQw">https://youtu.be/csHCHoFygQw" type="application/x-shockwave-flash" width="425" height="350">
tiRally is offline   Reply With Quote
Old 04-19-2021, 02:19 AM   #2
J!m's Avatar
Join Date: Jun 2003
Location: Bouncing off the rev limiter in CT!
Posts: 3,045
iTrader: (1)

Check for corroded ground leads.

If it’s not simple, you have to go back to ground zero and check everything...
"Speed's just a question of money. How fast you 'wanna go?"

Order Swap Manuals Here => http://www.318ti.org/forum/showthread.php?t=12912

WolferJ- gone but not forgotten. R.I.P.
J!m is offline   Reply With Quote


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
Error Code List - Stomp Test OBD1 biorjin Engine 28 02-08-2011 01:21 AM
Crankshaft position sensor netn3gro Maintenance 1 03-05-2007 12:54 AM
95 ti wont start or crank wctouring7 Electrical 11 12-23-2006 10:14 AM
Help! Have spark, Have fuel, NO START fat-ti Lounge 13 10-30-2006 05:30 AM
error code list biorjin Exhausts 0 10-10-2005 01:55 AM

All times are GMT +1. The time now is 05:35 AM.

Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2021, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 65.09 k/74.79 k (12.97%)]

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