After the starter relay was replaced in the workshop a few weeks ago, it seemed to be fixed, but now the problem has reappeared.
"In the morning, when starting the car cold, everything works perfectly. Afterwards, the vehicle is parked in an underground garage where it remains at a temperature of approximately 18-19°C for 8-9 hours."
When I start the vehicle, the following happens:
The starter motor turns, and the engine seems to be starting, but you can see...
The tachometer needle fluctuates between 400 and 900 RPM, and the engine shuts off after 2-3 seconds (sometimes it only fluctuates between 400-600 RPM). The EPC light remains on.
2. The second time you try to start it, you'll either experience the same problem, or it will start normally.
"At the latest on the third attempt, I always managed to get the engine running."
Unfortunately, the error memory does not have any entries.
It actually looks like the engine isn't starting properly in the video... or it seems like an extra half-second of cranking might be enough... but that could be deceiving.
LG, Onkel BM
*Nichts ist einfacher, als sich schwierig auszudrĂźcken......*
**Technische Fragen bitte ins Forum und nicht in mein Postfach**
I just tried pushing the ignition key in a little further past the point where the engine normally starts, and held it there -> same behavior.
By the way, if we're talking about duration, this phenomenon should occur everywhere.
However, as described, I have only done so (until now) under the given circumstances.
The speed of up to 900 RPM indicates that the engine is starting, but then it's either not getting enough fuel or air, or it's not producing sufficiently strong spark plugs.
What happens if you use starting spray to help start the engine?
Are the values from all the temperature sensors okay? (Incorrect temperature readings could lead to incorrect EM calculations.)
Check the temperature readings before and during startup.
hg
Herbert.
Horch A4 8K CJCD
Golf 7 DDYA
(+ Audi 80 Avant B4 1Z 475Tkm - habe ich vom ersten bis zum letzten Tag gerne gefahren)
(+ Passat Variant 32B CY 400Tkm)
I assume that the 1.4 TSI engine, like the Golf 5 1.9 TDI, has more than just one temperature sensor (I haven't looked at the measurement blocks yet).
Does anyone happen to know which one would be relevant for this?
Okay, so I've been trying for several days to get the temperature sensors...
to capture and compare. Unfortunately, the vehicle has experienced issues in recent days.
no longer showing that behavior...
However, one day I noticed that the device was displaying an outside temperature of 7 degrees Celsius in the underground garage, even though it was at least 17 degrees Celsius.
I will continue to follow this in the coming days and update it here later.
However, one day I noticed that it displayed the outside temperature in the underground garage as 7 degrees Celsius, although it was at least 17 degrees Celsius.
Die AT-Anzeige ist stark gedämpft, verzÜgert und teilweise auch fest gesetzt. DThis is normal.
The reason is likely that they don't want the temperature reading on the dashboard to be affected by engine heat or sunlight every time the vehicle stops. Therefore, it's primarily measured while the vehicle is in motion, and even then, the readings are heavily dampened.
To my knowledge, the AT (air temperature) is not further processed by the engine control unit. It has its own sensors for that purpose. (Depending on the engine: Temperature from the mass airflow sensor â ambient temperature; temperature from the boost pressure sensor â intake air temperature).
Greetings.
Sure.
Here is the translation of the text from German to English:
"Guste" means "gust" in English. It refers to a sudden and strong gust of wind.
Based on what I've seen on the external display of the 3C, it's like this:
Outside, it's permafrost conditions.
To defrost, I drove it into the garage â a space with a temperature of approximately -3 degrees Celsius.
This temperature will be stored for X hours.
I think I only spent about 2 hours on it.
After starting the engine, the dashboard displayed -3°C, but it quickly warmed up (at a rate of approximately 0.5 degrees per second) until the actual temperature of about 12°C was shown.
I'm not sure why the engine-related sensors of the CAXA should do that...
I might take a closer look at the CAXA sometime in the next few days.
##########################
Another theory:
The LMM (likely referring to a laser module or similar device) fogs up during periods of inactivity.
Cold measurement film in a humid and warm environment.
Then it is initially "well isolated" from the water film and hardly delivers any air mass... the vehicle essentially chokes itself.
Okay, please provide the German text you would like me to translate into English. I will only provide the translation.
Okay, I've made a little progress, but unfortunately, I'm still no closer to understanding.
So far, I haven't been able to detect any anomalies in the measurement data blocks.
However, I was now able to limit it based on the displayed outside temperature.
It only occurs when the car displays an outside temperature between 15 and 17 degrees Celsius.
The problem happened again yesterday, and instead of waiting to see if it would "die," I just briefly pressed the accelerator, and sure enough, the engine kept running.
I will continue to investigate this, and if I don't have a better understanding in the next 2-3 weeks, I will take the car to the workshop and show them the videos of the problem.
The problem occurred again yesterday, and instead of waiting to see if it would "die," I simply gave it a little bit of gas, and sure enough, the engine stayed running.
Aha...
Perhaps the previously learned valve clearance is no longer correct because oil sludge has accumulated.
Try recalibrating the throttle body (if your vehicle's engine control unit supports that function). It might solve the problem.
Please don't stone me if this doesn't fit the problem engine being discussed here .
@Ulf, I haven't been able to determine yet whether this works with that engine; I haven't found anything about it so far.
Okay, so today I'm going to behave a little differently:
Outside temperature according to AI: 17 degrees.
Coolant temperature: 20 degrees.
Intake air temperature: 21 degrees.
"When I started the car, it took about 4 minutes of cranking before it finally turned over. Once it started, the RPM was around 500, and the EPC light was on. I watched it for 4-5 seconds, but since nothing changed, I gave it a little gas, and then everything was fine."
Unfortunately, there is also no entry in the error memory .
Here's another video showing the long engine starting up (it's a bit quiet, so just turn up the volume). It was only started, no throttle was applied.
I need to take the car to the workshop this Wednesday because the rear seatbelt needs to be replaced. I'll show my colleagues some videos about it; let's see if they can understand and fix the problem.
Otherwise, everything is as usual, no errors in the memory .
Best regards!
Passat 3C - Starting problems with the engine (1.4 TSI, CAXA) - anlassen.mp4
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