After finishing a tuneup the vehicle backfires then stalls when coming to a stop

Hi,

Either there is a vacuum leak, a bad spark plug, or a bad or not fully connected coil pack.

Do you have a live data scanner? If so, scan the computer and see if there is a misfire specific to one of the cylinders or if there is a lean mixture code. By doing this, it will point us in the right direction. If it is a misfire, lets hope it is up front.

Most parts stores will scan it for you. Also, I wouldn't suggest driving it until we have it scanned. If it is a misfire, raw unburned fuel can damage the catalytic converter.

Let me know what you find or if you have other questions.

Take care,
Joe

When I took off the intake manifold and seperated it from the throttle body there was a black plastic piece that was broken lodged inside the manifold. I removed it. Could this be a cause for a problem?

I do not have a scanner.

Hi,

Yes, but where did it come from. I am going to provide the directions for removal of the intake. The attached pics will correlate. See if you can pinpoint where it was located. If you still have the broken part, can you take a pic of it and upload it for me?

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2005 Hyundai Truck Santa Fe V6-3.5L
Procedures
Vehicle Engine, Cooling and Exhaust Engine Intake Manifold Service and Repair Procedures
PROCEDURES
INTAKE MANIFOLD


pic 1


COMPONENTS

REMOVAL


pic 2


1. Remove the air intake hose connected to the throttle body
2. Remove the engine coolant hose and throttle body.


pic 3


3. Remove the P.C.V hose and brake booster vacuum hoses
4. Disconnect the vacuum hose connections.


pic 4


5. Remove the surge tank stay.
6. Remove the surge tank.


pic 5


7. Remove the surge tank and gasket.


pic 6

8. Disconnect the fuel injector harness connector.


pic 7


9. Remove the delivery pipe with the fuel injector and the pressure regulator.

NOTE: When the delivery pipe is remounted, be careful not to drop an injector.

10. Disconnect the wiring harness of the coolant sensor assembly.

INSPECTION

SURGE TANK AND INTAKE MANIFOLD
1. Check the surge tank and intake manifold for damage, cracking or restriction of the vacuum outlet port, water or gas passages.
2. Check for distortion on the surface using a straight edge and feeler gauge.
Standard value: 0.15 mm (0.006 inch) or less
Service limit: 0.2 mm (0.0078 inch)

INSTALLATION


pic 8


pic 9


Install the intake manifold and delivery pipe reversing the order of the removal procedure.

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Let me know if you can tell which pic or location it was found.

Joe

In the first picture the upper intake. It was inside the upper intake on the right side where the throttle body disconnects from it. Does that help?

By any chance, did you save the part? In that location, there really isn't much. I would think it would have come through the air intake / air box if it was there.

Joe