Question about 1998 Volvo S90

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Weak engine turnover / shaking engine

Went to turn on 98 Volvo S-90 and engine was very slow to crank, it finally turned over but the engine was shaking so hard the entire car was shaking. I've checked everything from the fluids to the fuses, but I don't have any idea what it could be. Any help is appreciated.

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  • madcams May 11, 2010

    Can you give me more information? What was done before this happened? a Tune up? removing the intake manifold? if neither of these 2 had been done right before, then I would suggest removing the vacuum line from the fuel pressure regulator. If you notice ANY fuel in the vacuum line then the diaphragm has ruptured, and you are burning wayyyy tooo much fuel.

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There could be a few possibilities:
1. Air Mass Sensor
2. Ignition Circuit Units
3. Dirty Idle Valve
4. Dirty Throttle Body
4. Voltage Regulator

Check the above one after another.

Posted on Aug 03, 2009

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2 Answers

Engine will not turnover


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Short answer, your batter is bad. or is disCHARGED:
Long.:

wont crank?
no engine, cranks ,unless the starting system works.
unless pushed fast, like my car or i park on a hill and coast jump my car.(M/T tranny rule)

NO crank, is the true failure here:
slow Cranks are , bad battery , or a discharged battery , due to bad charging system or parked for 3 months or longer.

so ill assume its NO CRANK.
I turn the key TO START and the starter fails to CRANK.
the starter motor is dead. (key clue 1)
so i attach a set of jumper cables to my Caddy, running and this car
now cranks and RUNS (you left that out. above, huh? runs)

turnsover means nothing, because the engine starter turns over
and the engine can turn over and the engine can run,
once running the EFI system SUSTAINS runninng.
so there are 4 states there. (4 phases )

No cranks #1 reason to be slow , are a bad battery
so I charge that battery, and see how if it cranks , now?
it dont crank means a bad battery
it does work( crank) see how long it works.../?
if it dies again, or better, check the cars Alternator for by measuring
accross the battery terminals running , with any volt meter.
13.3 to 15vdc is a good alternator running the engine.
if NOT, the charge system is bad. (system)

On some cars the IMMO can block Cranking or for sure blocks
fueling after 2 seconds. So. watch the IMMO light on the dash.
Immo is the Immoblizer. option.





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