1994 volvo 850 won't start

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1994 volvo 850 won't start

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1994 volvo 850 won't start - 8/15/2007 1:05:03 PM

animal40

Posts: 16
Joined: 7/14/2007
Status: offline

Started my 850 estate yesterday lunch time it ran for about 3 seconds then cut out and has not started since.
Called out the AA the engine has no spark, no injector pulse and a camshaft sensor fault code.
The AA mechanic said the crankshaft sensor was not putting out enough voltage aaprox 0.26V.
Have replaced crankshaft sensor and camshaft sensor today.
Engine turnes over but still wont start, dose not even try.

PLEASE HELP!

Post #: 1

RE: 1994 volvo 850 won't start - 8/15/2007 1:30:19 PM

RedTurbo850

Posts: 1228
Joined: 9/21/2006
Status: offline

But the ignition in slot II and have a friend listen near the pass. side rear wheel and see if they hear the fuel pump priming. Also, crank the engine and have a friend bang on the fuel tank a couple times.

If your car starts w/ the banging technique, your fuel pump is toast. IF you dont' hear it priming, either your pump is toast or your relay is toast.

Did the mechanic do anything about the spark?

(in reply to animal40)

Post #: 2

RE: 1994 volvo 850 won't start - 8/15/2007 1:43:16 PM

animal40

Posts: 16
Joined: 7/14/2007
Status: offline

The AA mechanic said the crankshaft sensor was not sending a strong enough signal to the ECU hence no spark, no injector pulse but i have replaced both of these.
I have recently replaced the fuel pump relay and have good presure at the fuel rail.
Totaly Baffled????

(in reply to RedTurbo850)

Post #: 3

RE: 1994 volvo 850 won't start - 8/15/2007 1:51:31 PM

RedTurbo850

Posts: 1228
Joined: 9/21/2006
Status: offline

If you have good pressure at the fuel rail...

Then your issue is spark.

Remember, three things to start a car. Fuel, Air, Spark. You need to test and see if you have spark.

(in reply to animal40)

Post #: 4

RE: 1994 volvo 850 won't start - 8/17/2007 11:26:08 AM

animal40

Posts: 16
Joined: 7/14/2007
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Just checked for a spark and as the AA mechanic said there is no spark.

(in reply to RedTurbo850)

Post #: 5

RE: 1994 volvo 850 won't start - 8/17/2007 11:57:10 AM

JimKW

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Joined: 3/12/2005
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Could be coil or Cam Positon Sensor.

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Post #: 6

RE: 1994 volvo 850 won't start - 8/17/2007 2:43:29 PM

tech

Posts: 25821
Joined: 9/16/2004
Status: online

I would look at the Cam Position sensor before the coil.

_____________________________

1987 Ford mustang LX Coupe 5.0
1995 Yellow T5-R (Newly added HID'S)
1996 850 turbo

(in reply to JimKW)

Post #: 7

RE: 1994 volvo 850 won't start - 8/17/2007 3:34:21 PM

JPN

Posts: 4322
Joined: 9/8/2006
From: New England/Midwest/Japan
Status: offline

Hello mate,

Greetings from Narita, Japan.

I just went through the factory manual and it says the CMP sensor output voltage varies between 0.1V to 5V during cranking.

I will attach the page that has CMP sensor testing procedure (a digital multimeter is required), as well as the location for OBD-I code-retrieving unit location in the engine compartment (not sure if '95 UK models come with OBD-II; OBD-II was installed on '94 and later US models). The socket for ignition module is A-6.

Please note that I'll be deleting the manual in the next few days so please save it in your PC, or you can get the same manual at: http://www.volvoclub.org.uk/volvo_workshop-850techdocs.shtml

I hope this helps. If not, come back again.

Cheers,

JPN

< Message edited by JPN -- 8/18/2007 10:59:03 AM >

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(in reply to tech)

Post #: 8

RE: 1994 volvo 850 won't start - 8/18/2007 5:30:54 AM

animal40

Posts: 16
Joined: 7/14/2007
Status: offline

Fault codes found after ignition failure 3-2-4 / 2-1-4 / 1-3-1. I have replaced both sensors but still no spark. The AA mechanic said the coil was powering up ok but not firing. He also said that the injectors wer not receiving any signal.

(in reply to JPN)

Post #: 9

RE: 1994 volvo 850 won't start - 8/18/2007 7:03:05 AM

tech

Posts: 25821
Joined: 9/16/2004
Status: online

All those codes refer to either the Cam or crank sensor.
131= RPM sensor signal absent.
214= RPM sensor signal absent Intermittently.
324= Cam position sensor signal absent Intermittently.

_____________________________

1987 Ford mustang LX Coupe 5.0
1995 Yellow T5-R (Newly added HID'S)
1996 850 turbo

(in reply to animal40)

Post #: 10