Illusionyary

Yes it is. Xlive blocks GFWL. If you want to play online you'll have to use dsound.

I'm not entirely sure as I've never heard of nor experienced this issue before, but turn tires is possibly the cause as the author did note that sometimes your car will drive off or you will be thrown out by an invisible person. 

You need to create a commandline.txt file with "-norestrictions" written inside of it in your game directory. 

Did you also increase the emissive amount in the TBoGT folder? If not, that's your problem. 

Increase the Range_PRML and Inten_PRML numbers under the [ ENV LIGHTING ] section of your ELS.ini file. 

Press/hold Alt+K.

Is the vehicle status turned to "on" in the slot control file?

It's apart of ELS.
 
Open the ELS.ini file and under [ INTERFACE ], change "LocationDisplay = onalways" to "LocationDisplay = off".

The model you are using has mapped wig-wags, whereas the model in the other video (with reflections) is using ELS V8's wig-wags feature. 
 
All you have to do is enable the headlight wig-wags in the VCF (vehicle configuration file) in the ELS folder.

You also have to enable multiple livery support in the trainer configuration file. 
 
Open trainer.ini
Hit Ctrl+F to bring up the finder
Type in "livery" and press enter
Change "VehicleLivery=1" to "VehicleLivery=0"
Save and you're good to go.
 

Did you install dsound and scripthook? 

If editing the VCF didn't help, there's nothing you can do as it's model related problem. 

Turn extras 7-9 off in the VCF. 

Make sure you've got the correct version of SparkIV (this one should work). I'd also suggest exporting the RAR contents to your EFLC folder and running it from there, that works for me. 

Are you running Simple Native Trainer in conjunction with ELS? If so, you need to disable the trainer hot-keys. 
 
Have you got scripthook and an asi loader (dsound) present, have you patched to 1.0.7.0? https://support.rockstargames.com/hc/en-us/articles/200145406-Grand-Theft-Auto-IV-Patch-7-Title-Update-v-1-0-7-0-English-1-0-6-1-Russian-1-0-5-2-Japanese-

Same issue here, I tried my backup copy (which was working perfectly about 24 hours ago) and that doesn't work either. The only thing I've done since then that may have affected it was updating Watch Dogs.  

Change the primary lighting type to rota inside of the vehicles ELS configuration file, which is located in the ELS folder. 

Delete dsound and install xlive otherwise the game will force you to update to patch 7 as soon as you get in-game. As for the d3d9.dll error, try using another one. 

Edit the "Other emissive lights" section in the visualSettings.dat file, change it to 100 or something. Or, use an ENB optimized for ELS, such as this one: '?do=embed' frameborder='0' data-embedContent>>

Upgrade your game to patch 1.0.7.0, LCPDFR is not compatible with patch 1.0.4.0.  
http://support.rockstargames.com/hc/en-us/articles/200145406

MODERATOR NOTICE
Moving to GTA IV Support.
 
Just make sure you don't uninstall RGSC when install 1.0.4.0, or update the game when it tells you to when you get in-game.

Oh my bad. Here's a line from one of my clan directories, which is setup for a Tahoe. The only issue is that it's using the polpat as a base. However I think it should work better than the other one.
nstockade, nstockade, car, POLPAT, POLPAT, VEH@VAN, VEH@VAN_FO1_FO1, 100, 999, 0.2786, 0.2786, 0, 4, 1.5 ,1, truckfirefx+livery

MODERATOR NOTICE
Topic belongs in GTA IV support, moving.
 
You'll need to post more information than that, it could be a number of things. 

Emergency Lighting System V7 added a staging system. You need to press "J" three times before the siren is able to be activated. 

Sorry about the music, you should still be able to hear me! 
http://www.youtube.com/watch?v=tTf7tG39vBo
About the ending, I have no idea. I cut that out with the YouTube editing but it may take a while to process the edits.
 
EDIT: Wow! I sound so different in that other video!