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2006 Hyundai Tuscon 2.7 crank but no start

  • Toolman10000
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25 Jan 2019 17:02 #26531 by Toolman10000
2006 Hyundai Tuscon 2.7 crank but no start was created by Toolman10000
Hello. So the car has no codes. It cranks good but won’t fire. I have spark and fuel. The only thing I’ve noticed so far is the control side of the fuel pump relay and a fuel injector read 4.1 volts. When the computer grounds them they drop to zero. Not sure if that’s normal. On one fuel injector is being pulsed at 1.1 hz. Not sure where else to look. Any ideas ?


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25 Jan 2019 18:27 - 25 Jan 2019 18:37 #26536 by Weycraze
Replied by Weycraze on topic 2006 Hyundai Tuscon 2.7 crank but no start
The 4.1 volts doesn't sound so good, was this measurement taken at pin 3 or 5 of the Fuel Pump Relay? Is there a difference at these two pins when It is KOEO and KOECranking?

Very curious as to why 4.1 volts.

Fuel Pump Relay(FPR) Control Side:
-Pin 3 FPR is the ECM GND CTRL wire
-Pin 5 FPR is 12V from Engine Control Relay

May have to test what is happening when the contacts close on the Engine Control Relay, you've got some serious voltage drop somewhere.

I've attached diagrams for you.

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How did you test for Spark and Fuel?
Attachments:
Last edit: 25 Jan 2019 18:37 by Weycraze. Reason: adding diagrams lol

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25 Jan 2019 21:12 #26537 by Toolman10000
Replied by Toolman10000 on topic 2006 Hyundai Tuscon 2.7 crank but no start
It was taken at pin 3. Pin 5 shows battery voltage when the main relay turns on. As soon as the ecm grounds pin 3 it drops to zero. It almost seems normal.

Spark I tested with a test light to ground. It had good bright spark. Fuel pressure I can smell it and the fuel pump is supposedly new. Putting a gauge on it looks to be impossible with out some modification.

I’m wondering if timing jumped a tooth or 2. I wonder how many teeth it could jump before valve contacts a piston ?


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26 Jan 2019 10:31 #26546 by Noah
Were the measurements taken with the relay connected or disconnected?
Thinking of a bias voltage while disconnected.

"Learn, apply, repeat."
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26 Jan 2019 10:41 #26547 by Weycraze
Replied by Weycraze on topic 2006 Hyundai Tuscon 2.7 crank but no start
If thats the case your losing ~8v inside the Fuel Pump Relay, there should be 12 volts on pin 3 and 5 before the ECM grounds pin 3!

A little trick you can do is wrap a strand of wire of sufficient length around pin 3 and 5 and install the relay so you can put your meter on the strands.

You measurements indicate a bad Fuel Pump Relay.

Try swapping around relays with another that isn't required for starting.

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26 Jan 2019 15:37 #26557 by Toolman10000
Replied by Toolman10000 on topic 2006 Hyundai Tuscon 2.7 crank but no start
Those measurements were taken with relay unplugged. I guess a 4.1 volt bias voltage is possible on the fuel pump relay control ground and and a fuel injector ground also when unplugged.

Fuel pump seems to work fine. I can smell fuel and relay runs fuel pump on key on.

I’m thinking the timing belt might’ve jumped a tooth. Even though the timing belt is moving. It is badly cracked up and way overdue for replacement.

I’m going to hook up a scope and check coil firing to compression drag through the starter wire.

Other thing is when starter is running the cranking doesn’t sound even.


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26 Jan 2019 17:01 #26560 by Weycraze
Replied by Weycraze on topic 2006 Hyundai Tuscon 2.7 crank but no start
Thats good, you've got a scope.

Please post back your findings.

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27 Jan 2019 11:20 #26583 by Tyler
Replied by Tyler on topic 2006 Hyundai Tuscon 2.7 crank but no start

Toolman10000 wrote: I’m going to hook up a scope and check coil firing to compression drag through the starter wire.


Good idea here. B) Even if this passes, I'd still consider pulling the upper timing covers and manually check timing.

The other quick test you can do is hook up a vacuum gauge to the brake booster hose and watch it during cranking. There should be a few inches of vacuum. Any pressure reading is a red flag.

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28 Jan 2019 08:44 #26631 by kostelectronics
Replied by kostelectronics on topic 2006 Hyundai Tuscon 2.7 crank but no start
Do a Timing-check with a scope first. The engine can Sound uneven because injected fuel washed the cylinder-walls and you have low compression now. If the Timing is ok, do a compression test and a leakdown test. You have to find why the engine makes an uneven Sound during cranking...

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11 Feb 2019 23:12 #26991 by Toolman10000
Replied by Toolman10000 on topic 2006 Hyundai Tuscon 2.7 crank but no start
Well it’s been a while and I was going to check timing but the car started and ran fine. So I wasn’t able to check anything. Now just yesterday the car will not start again. It’s definitely getting fuel and that uneven crank is because the cylinder is washed down. There are no codes which gets me. Maybe it’s the crank sensor not sure. I’m going to check it out tomorrow.


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12 Feb 2019 08:45 #26995 by Tyler
Replied by Tyler on topic 2006 Hyundai Tuscon 2.7 crank but no start

Toolman10000 wrote: Well it’s been a while and I was going to check timing but the car started and ran fine.


Interesting! No timing issue, then.

Now just yesterday the car will not start again. It’s definitely getting fuel and that uneven crank is because the cylinder is washed down. There are no codes which gets me. Maybe it’s the crank sensor not sure. I’m going to check it out tomorrow.


Maybe stay with the relative compression test anyway? Not because you're gonna find a timing issue, but because it may be useful to know which cylinders are getting washed down.

Opening the throttle during cranking doesn't help?

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12 Feb 2019 08:53 #26997 by kostelectronics
Replied by kostelectronics on topic 2006 Hyundai Tuscon 2.7 crank but no start
It's a good idea to check the Crank-Sensor on These vehicles!
Currently, i have the exact same car here with the same symptoms. The Wiring to the CKP was completely rotten and made temporary Shorts. The CKP sits on the bottom of the engine near the starter Motor. It's a pain in the a... to remove it!

BR from Switzerland
Matthias

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12 Feb 2019 19:18 #27013 by Toolman10000
Replied by Toolman10000 on topic 2006 Hyundai Tuscon 2.7 crank but no start
OK I check spark with my test light today. There is spark but it seems weak. He would only jump a gap of maybe 5 mm pulling the test light away from the contact. I guess I should hook up the scope to the crank sensor and see what kind of a graph I get.

When the car does start it runs perfect.


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13 Feb 2019 18:11 #27027 by Toolman10000
Replied by Toolman10000 on topic 2006 Hyundai Tuscon 2.7 crank but no start
I checked the crank signal with the scope today. I had a nice square wave 0 to 5 volts. But, every second or so there is a drop out. Is that normal ?


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13 Feb 2019 19:39 #27028 by Monde
Replied by Monde on topic 2006 Hyundai Tuscon 2.7 crank but no start

Toolman10000 wrote: I checked the crank signal with the scope today. I had a nice square wave 0 to 5 volts. But, every second or so there is a drop out. Is that normal ?


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It is not normal. It is most likely a bad sensor. A drop out in the positive or ground wire will cause a drop out in the signal wire. Scope the positive and the ground wires to see if they drop. If they don't, you have a failing sensor.

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14 Feb 2019 03:20 #27029 by Toolman10000
Replied by Toolman10000 on topic 2006 Hyundai Tuscon 2.7 crank but no start



Does this look normal. Or should it be steady squares ?


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14 Feb 2019 04:21 #27030 by Toolman10000
Replied by Toolman10000 on topic 2006 Hyundai Tuscon 2.7 crank but no start


Judging by this pic. I’m going to say that waveform is probably good.


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