|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Today's Posts | Search |
|
BMW 3-Series (E90 E92) Forum
>
2009 323i Stalling/sputtering on cold start
|
|
08-12-2019, 03:47 PM | #1 |
New Member
0
Rep 8
Posts |
2009 323i Stalling/sputtering on cold start
Hi there I figured I would reach out to everybody to get some advice. I have a 2009 323i and at times usually in cold weather the car struggles for power on Startup and sometimes stalls all together. To date I have replaced the coils I have cleaned the mass airflow sensor and have replaced the spark plugs. I figured I would reach out first for suggestions on possibilities as to what other maintenance I could perform before moving to any other extreme maintenance. Any advice is appreciated!
|
08-13-2019, 12:39 PM | #2 | |
Private First Class
15
Rep 154
Posts |
Quote:
|
|
Appreciate
0
|
08-13-2019, 12:42 PM | #3 | |
Private
17
Rep 94
Posts |
Quote:
|
|
Appreciate
0
|
08-13-2019, 11:37 PM | #4 |
No one sleep in Tokyo
945
Rep 1,507
Posts
Drives: 2011 E90 328i//1995 E34 530i
Join Date: Oct 2018
Location: San Diego, California -> Austin, Texas
|
I would look at your fuel system components from the symptoms you described. How long do you let it warm up, how cold?
__________________
2011 E90 328i, 1995 E34 530i, 1992 E32 740i, 1991 E34 525i
|
Appreciate
0
|
08-14-2019, 02:40 PM | #5 | |
Brigadier General
2697
Rep 4,031
Posts |
Quote:
ANY P-code reader that can read P-codes (OBD II Fault Codes) AND basic Parameters, in this case ECTS (Engine Coolant Temp Sensor) signal as received by the DME (Engine Control Module). Engine Temperature, as measured by the ECTS, is the PRIMARY Input the DME uses to control ENRICHMENT or Air/Fuel Ratio. If you ever used a small-engine device with a Manual Choke (lawn-mower, Chainsaw, Pressure Washer, etc, you know that you have to make the fueling "Richer" (HIGHER Fuel/Air Ratio) on cold start, and for first seconds after engine startup, or the engine will NOT keep running, even at idle, and certainly NOT when load is applied. Early August is NOT exactly "dead of winter" in Toronto, and it probably hasn't gotten below 60F overnight for the last two months. IF you have a problem with engine starting or keeping running in the first 30 to 60 seconds after COLD Start (first start of day, ambient temp 60F or more) or it stumbles and hesitates until it has run 3 to 5 minutes (near fully-warm), but it has NORMAL POWER once warm, that is almost certainly an issue with enrichment when "cold", defined as less than ~ 150F engine coolant temp. If it starts and runs normally if restarted < 30 minutes after warm shutdown, that's one more confirmation. As stated, ECTS signal is first suspect. How to test? Multiple choices, EACH with "cold" engine that has NOT been run for >6 hours: 1) If you have ANY scan tool that can read engine Parameters, simply connect it to OBD II Socket, turn Ignition ON, but do NOT Start engine; select Parameters or "Live Data" and look for ECTS or Engine Temp. If the Temp Value you see is significantly GREATER than actual ambient (outside) temp, then you have found the SOURCE of the probem, but see below BEFORE throwing parts. 2) NO Scan Tool you say -- sorry, you can't get off that easy -- YOU HAVE "Hidden Menu 7.00" Just follow the procedure found here, and you can read the ECTS signal (as received by DME) on your Instrument Cluster -- just do NOT turn off ignition or you will have to activate Hidden Menu 7.00 all over again. NOTE: you can use Hidden Menu 9.00 to monitor Alternator Output with engine running, so this is a handy tool to diagnose overheating or Alternator Under-charge or OVERVOLTAGE situations as well: http://e90.wikifoundry.com/page/BC+hidden+menus 3) Measure Resistance (Ohms) across the spades of the ECTS after removing the connector. The resistance should measure something in the range of 2500 Ohms at 20C (68F) and 250 Ohms at 90C (194F). Since Resistance varies INVERSELY with Temperature (resistance Decreases as Temperature Increases), a short (decreased resistance would give a "False High" Temp signal and result in LEAN fueling, causing stall when engine cold. Here is TIS diagram showing location of the ECTS, and also the TIS circuit diagram showing its wiring to the DME. https://www.newtis.info/tisv2/a/en/e...engine/SFweFnV https://www.newtis.info/tisv2/a/en/e...ooling/vFKjkjB That is ONLY the "first suspect" so if the suggested tests do NOT show any issue with ECTS signal, Scan for Fault Codes and describe EXACTLY what symptoms occur and at WHAT engine Temp, similar to my description of classic symptoms of ECTS signal issues. George |
|
Appreciate
0
|
Bookmarks |
|
|