|Try to limit your use of "was" and "is" when your story is told in present tense. Was and is are passive. They throw your reader out of your story, put them in their easy chair, outside the drama and trauma.
You might have to many gerund's in your writing and it can make you look like a bad writer. A gerund is a verb that ends in -ing and functions as a noun. Too many gerunds make your writing passive. You take a wonderful verb, attach it to the passive is or was and water down the energy of your action.
One good thing to keep in mind with a story like this it's good to keep in mind the view of the character. When you write a description, do it through the eyes of your POV character. Notice what s/he would notice. Describe the car/street/building/etc. as s/he would see it, and only with what s/he would know. If s/he doesn't know about the engine, leave it out no matter how fascinating the spark plugs are. If you must get that detail in, s/he can run into someone who chats about it. Now, s/he has that knowledge to share, or use.
Hope these tips help!