Post Reply 
Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
'07 Elantra Not Starting. Diagnosis Help Please
08-24-2014, 06:05 PM
Post: #1
'07 Elantra Not Starting. Diagnosis Help Please
Hyundai Elantra, 2007, GLS, 2.0L, Automatic, 99k, Northeast/New England

So I'm trying to fix my mother's 2007 Elantra GLS. Had trouble starting a few days ago and isn't starting at all right now. The engine is turning but it's not starting. It also broke down on the highway after not accelerating past 60mph, struggling on a hill, and not upshifting at 5,000RPM. got slower and slower until the engine cut off. This happened and now it isn't starting.

Some Background info:
recent oil change.
all the fluids are fine. gas, oil, water, coolant, all full.

Alternator recently replaced.

Hyundai dealership recently updated the computer as a recall.

I changed the spark plugs after it wasn't starting.
I also replaced the o2 sensor and the crankshaft sensor(they both showed up on an OBD test)
I cleaned the Mass airflow sensor
I checked the Fuel pump fuse and it's fine.
I also checked the fuel pump relay, it's fine.
The car battery is also fully charged.

The o2 sensor and crankshaft sensor are not showing up on the OBD test anymore.

We removed the rear seats and accessed the fuel tank panel, and can hear it buzz when the ignition is set to "on".

Trying to get my hands on a fuel pressure tester to see if the fuel pump is working at all. I'm thinking it could either be a clogged fuel filter or just a broken fuel pump. Also a chance of a faulty coolant sensor. I've also heard that sometimes a faulty camshaft sensor won't show up on an OBD test, does anyone have any experience with this? Any thoughts? Please help!
Find all posts by this user
Quote this message in a reply
08-24-2014, 10:19 PM
Post: #2
RE: '07 Elantra Not Starting. Diagnosis Help Please
You need to figure out what is missing, spark or fuel. The easiest way to do that is to give it a shot of starting fluid or dump a small amount of gas into the intake. (1-2 teaspoons would be enough) If the car starts, you know that you have a fuel issue. If it doesn’t start, you probably have a spark issue. Use a tester to check for spark. Once you know what is missing it will be a lot easier for us to help you.

If the car hasn’t started since the last scan there probably won’t be any codes. The engine usually has to run to detect errors and set codes.

Let us know what you find & we’ll go from there.

Thanks for using the forum,

Interested in Mining? Look here: Coal Mining, PA
Visit this user's website Find all posts by this user
Quote this message in a reply
Post Reply 

Forum Jump:

User(s) browsing this thread: 1 Guest(s)