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Bad Relay? 850 1994

posted by  Mike91 on  Mon Feb 24 14:03 CST 2014
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last visit: Wed Sep 17 19:52 CST 2014
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If you can find an inductive pickup timing light (pickup clamps over an ignition wire) you could determine if the ignition system is producing spark.

I have a 1998 V70 that experienced lawnmower syndrome a few months ago - after lots of cranking it finally started, ran rough, then smoothed out and has been fine ever since.

Slightly corroded electrical connectors could be a culprit - check the connectors for CPS, IAC, MAF, etc.

My son had a 1994 850 with about 170K miles. One day it would not start - a new CPS fixed it. Im sure there is a way to check the CPS signal - do you know anyone with an oscilloscope ?

Would the OBD diagnostics on a 1994 have a code for CPS ?

Can you approach the problem like this:

1. Check for correct pressure at fuel rail while cranking.
2. Check that injectors are pulsed regularly while cranking.
3. Check that plugs fire regularly while cranking.

If all 3 conditions above are satisfied and the engine doesnt start then compression could be bad - perhaps due to lawnmower syndrome.

Mike






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New Sudden Fuel Problem - New Pump, Good Relay [850][1994]
posted by  RepairmanJackal subscriber  on Fri Feb 21 15:36 CST 2014 >


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