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Old 04-19-2018, 04:26 PM   #1
milmatoro
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Question No injector pulse on volvo S70

My volvo s70 has no injector pulse. The problem started when i replaced the turbo due to continuous smoking.

On my trouble shooting, i have spark, good fuel pressure, crank sensor seems oky i can even read the rpm on the engine on OBD2 scanner.

The vehicle would start for just 2 seconds and shut off. I therefore removed the fuel rail with injectors attached then cranked the engine, i saw that the injectors would just spray fuel once, thus one full cycle and stops. Hence starting for just 2seconds. I then grounded the pulse wires to the injectors then they all sprayed. To me it was an indication of good fuel pressure.

I am suspecting the ECU because i tested for continuity on the pulse wire from ecu to the injectors and it was good.
Who anyone help me with a different opinion at solving the problem at hand.i am now clueless.
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Old 04-19-2018, 04:29 PM   #2
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I forgot to mention that the injectors have got constant 12v power supply. Anyone who might have encounted such a problem please help
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Old 04-19-2018, 09:07 PM   #3
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What year? You might have tripped the immobilizer.
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Old 04-20-2018, 12:59 AM   #4
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Cam sensor. The crank sensor determines engine speed but the cam sensor is used for injector sequencing during startup. Common failure with age, won't necessarily throw a CEL.
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Old 04-20-2018, 11:11 AM   #5
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It's 1998 model Volvo s70.
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Old 04-20-2018, 11:27 AM   #6
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Quote:
Originally Posted by gsellstr View Post
Cam sensor. The crank sensor determines engine speed but the cam sensor is used for injector sequencing during startup. Common failure with age, won't necessarily throw a CEL.
That could be true, I will have to take out the cam sensor and replace it.
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Old 04-20-2018, 04:02 PM   #7
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Or test it first. Spend your money on tools instead.
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Old 04-21-2018, 08:00 AM   #8
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Quote:
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Or test it first. Spend your money on tools instead.
Any idea on how best to test it, or the most appropriate testing method
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Old 04-21-2018, 08:35 AM   #9
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Did you test the fuel injector relay near the radiator fan relay?
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Old 04-21-2018, 01:05 PM   #10
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Quote:
Originally Posted by tryingbe View Post
Did you test the fuel injector relay near the radiator fan relay?
I am not sure if that is the fuel injector relay grey plastic in colour and that is were the fan is also connected.

As it stands I have not yet tested it if thats the one your are referring to, over snd above that my fan is not kicking on when I am cranking like it used to be. if that grey thing is the relay, it might also be a root caur of my problem.
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Old 04-21-2018, 01:16 PM   #11
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Quote:
Originally Posted by milmatoro View Post
Any idea on how best to test it, or the most appropriate testing method
The oscilloscope is my preferred tool. My Hantek scope was $80. Instead of spending $30 on fuel and sweating in the junkyard, one could test the sensor.

Another test method uses the multimeter: measure resistance and look for an open or possibly some huge amount of resistance.

Or try your luck with an LED test light. I would expect blinking, or a solid green light (depending on you light).

What is a logic probe?

Google fu:

http://www.aa1car.com/library/crank_sensors.htm
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Old 04-23-2018, 12:34 AM   #12
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I will update you as I try all your tips
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Old 04-23-2018, 11:36 AM   #13
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You also TEST the wiring before replacing a sensor.

Last edited by ZVOLV; 04-23-2018 at 11:49 AM..
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Old 04-24-2018, 01:33 PM   #14
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Thank you. I will try and work on it this weekend.
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