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Amedee
Amedee, Hyundai Technician
Category: Hyundai
Satisfied Customers: 25829
Experience:  ASE Technician advanced level specialist. Wisconsin certified emissions state inspector
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2004 Hyundai Sante Fe 6 cyl. - Starts easy, every time.

Customer Question

2004 Hyundai Sante Fe 6 cyl. - Starts easy, every time. Idles well. Upon acceleration, stutters and stalls. Checked timing, all good there. Sprayed Carbon Choke cleaner through air box, does not improve the running, so don't think it's a fuel delivery issue.
Submitted: 1 year ago.
Category: Hyundai
Expert:  Amedee replied 1 year ago.

Hello and welcome! My name is ***** ***** I can assist you with your question. It sounds to me like you have either plugged exhaust, a bad cam ro crank sensor or the mass air flow sensor is bad. Glad can help!

Customer: replied 1 year ago.
Well, that's great, but shouldn't we get a DCT with those? I can hook up and see if those sensors are reading...
Expert:  Amedee replied 1 year ago.

No not nessarily. There is no code for plugged exhaust. In addition, you could have low fuel pressure do to a weak fuel pump. There is no code for low fuel pressure.

Expert:  Amedee replied 1 year ago.

Be sure to check the air intake snorkle from the mass air flow sensor to the throttle body to ensure there are no cracks or rips. Is everything checks out good, the most likely possible cause would be a bad mass air flow sensor. Just be sure that the ignition components are in good shape and are not misfiring.

Customer: replied 1 year ago.
But, with a clogged exhaust, would it bog down immediately? This vehicle starts fine, and if you immediately rev, it bogs down and stalls out. Clogged exhausts, I thought, were more problematic upon warm up? And with low fuel pressure, spraying the Carbon Choke Cleaner through the air duct should have made it rev up, since it wouldn't technically be starving for fuel at that point and it offers no change.
Expert:  Amedee replied 1 year ago.

Right, if it were a "lack of fuel" then adding alternative fuel (such as carb cleaner) should help. If not, then no, the problem is not a "lack of fuel".

Expert:  Amedee replied 1 year ago.

Usually plugged exhausts are a constant problem.. not intermittant.

Expert:  Amedee replied 1 year ago.

I hope this helps! Please dont forget to honor your good faith deposit by rating my answer as "excellent service" for assisting you today. Of course, please let me know if you have any further questions and I will be happy to help!

Customer: replied 1 year ago.
How can we test the exhaust theory, given there is a cat incorporated into the manifold, without removing the manifold?
Expert:  Amedee replied 1 year ago.

You can remove the front oxygen sensors to see if that helps or you can check exhaust back pressure using an exhaust back pressure tester. It screws into the oxygen sensor whole after the oxygen sensor has been removed. The specs are no more than 1.5 psi at 2000 rpm.

Expert:  Amedee replied 1 year ago.
Customer: replied 1 year ago.
Ran diagnostic scan. It says
Long Term fuel trim idle load bank 2 -.01 msec
long term fuel trim part load bank 1 -3.3%
Long term fuel trim part load bank 2 -4.9%
Cylinder injection time bank 1 0.0 msec
Cylinder injection time bank 2 0.0 msec
Crankshaft position sensor tooth wheels -cmp rise edge 40.0
Crankshaft psotiion sensor tooth wheels -cmp Fall edge 99.0
Oxygen Sensor heating time bank 1 sensor 1 4.9V
Oxygen sensor heating time bank 1 sensor 2 4.9V
and a bunch more. The air flow rate fluctuated between 50 and 52 on the scope. Pulling 02 sensors now, and will report back.
Expert:  Amedee replied 1 year ago.

ok