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Warm engine stalls

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6.2K views 8 replies 3 participants last post by  AUTOSPARK  
#1 ·
Hello

Have a problem with my Santa Fe. 2004 2.4l.

My wife drove the car when the problem first appeared. She had been driving for 30 min, roughly 30km, and the car looses power and stops. Won't start when she tries. It cranks but won't fire up. When she waits for a minute it fires up but stalls.

We took it to a workshop. No code. They changed the fuel filter, which hadn't been changed for a long time.

They took it for a drive and it worked fine. I picked it up and it was working. Then it died when I exited the highway. It had lost some power during a second while still on the highway. I had driven it for roughly 30km and the engine was hot. Again, was able to start it it up for a couple of seconds if I let it cool for a couple of minutes. Got a lift home and returned in the evening and it started on the first try.

Took it to work the next morning. Wouldn't start in the afternoon when it had been standing in the sun and was gazing hot. Opened the fuel cap to release any vacuum. No change. Again started when I returned this morning and it wasn't very hot.

The engine warning lamp hasn't light up. Will try to see if there is a fault code tomorrow. Will try to measure the fuel pressure eventually.

The valve position sensor and timing belt was changed a year ago.

What do you think? Fuel pump relay? Cam shaft position sensor? Any other suggestions?

/C


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#2 · (Edited)
You need to know if you are getting spark when this no start happens so you can go in the right direction. If it gets spark, then you go in the direction of fuel. Get a spare spark plug, wait for the no start to appear, then unplug one of your spark plug wires and attach it to your spare spark plug. Put the case of the spark plug to a known good ground and have someone else try to start the car. If you see a good spark, then go in the direction of fuel problems. If no spark, look into the direction of coils, CPS etc. Notice you need two people to do this? I once had a Mazda that would break down on me and I never had another person around when I wanted to check for a no spark. Very frustrating, as the car would usually restart about the time another person showed up.
 
#3 ·
Hi again

So before I read your reply I tested to spray some start gas into the air filter housing, when the car wouldn't start. It fired up for a couple of strokes when I pressed the accelerator. Does this mean the ignition is ok and that I can focus on the fuel pressure? Have bought a lamp to test the spark so I will look into that as well, but I'm just curious.

Thanks in advance


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#4 ·
Personally, I wouldn't trust the starting fluid test. Use your tester or a spare plug and check for a spark. The second test I'd advise is to make sure the fuel pump relay switches on during crank. There's a fuel pump test connector below the dashboard fusebox. Make sure there is 9~10V on the fuel pump test terminal of the connector during engine crank...connector pinout below. If there is no spark and no voltage to the fuel pump that is pointing towards a crankshaft position signal fault.

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