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Long Cranking Time on 99 S70 GLT

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Cricket502
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Year and Model: 99 S70 GLT
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Re: Long Cranking Time on 99 S70 GLT

Post by Cricket502 »

I'm already in the process of randomly replacing stuff, so pile it on haha. Though the spark plugs and coils aren't that old... I did all of those about 2 or 3 years ago. I also bought a new fuel pump relay first in hopes that was my problem, since it was relatively cheap, before replacing the fuel pump. So neither of those 2 fuel pump parts fixed my problem.

Today on the highway I got the random multiple cylinder misfire code p0300 and the crankshaft position sensor code p0335 again, so I figured I'd check the crankshaft sensor tonight. It measured 125 ohms across the two pins, which I thought was supposed to be between 200 and 500, but I've seen other forum posts around 125 ohms too for both new and old sensors. The wiring looked to be in pretty good shape, but I noticed the connector probably wasn't plugged in all the way because it was way too easy to unplug. The end of the crankshaft sensor was dented though, as was one side of the sensor cylinder, which seemed strange. I cleaned it off and put it back, making sure no big wires were near that could interfere with the signal. Seemed like the car still took a while to start, but I'll try again in the morning and keep an eye out to see if the same CEL codes come back.

The battery cables visually looked fine too, but I didn't have time to figure out how to test those with the multimeter.
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RickHaleParker
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Re: Long Cranking Time on 99 S70 GLT

Post by RickHaleParker »

Engine speed (RPM) sensor

D2800351 Inductive sensor with permanent magnet Resistance 125.5 ±17 Ω
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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abscate
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Re: Long Cranking Time on 99 S70 GLT

Post by abscate »

Easy to check battery cables. Just measure voltage on each end, with the lights on bright for electrical load.

You want to see no voltage drop from end to end, less than 0.1 V. It's important to have some load to see if they can carry current for this diagnostic. If you've got a really high end voltmeter you can Measure resistanceDirectly, but if you own that tool you are in the wrong sandbox here....😀
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Re: Long Cranking Time on 99 S70 GLT

Post by RickHaleParker »

The battery cables visually looked fine too, but I didn't have time to figure out how to test those with the multimeter.

You place the multimeter across the cable, one probe at the battery terminal, the other probe at the other end of the same cable. Have somebody crank the engine and watch the voltage drop as the engine is cranking. You test connectors the same way.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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Re: Long Cranking Time on 99 S70 GLT

Post by abscate »

Have somebody crank the engine and watch the voltage drop as the engine is cranking.
Ricks' method is much better than mine (with lights) as it tests the cables under the actual fault condition (long cranking)

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Cricket502
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Year and Model: 99 S70 GLT
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Re: Long Cranking Time on 99 S70 GLT

Post by Cricket502 »

Been a while, lots of cold weather and travel preventing me from messing with the car. However, I've noticed that if I turn the key to position 2 and wait 8-10 seconds, it starts up perfectly every time. Less than that, and it usually takes a long time to start. Did I get a bad fuel pump or something?
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Re: Long Cranking Time on 99 S70 GLT

Post by abscate »

You confirm this by measuring the fuel pressure at the rail and looking for 50 psi when running.
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Re: Long Cranking Time on 99 S70 GLT

Post by misha »

Cricket502 wrote: Wed Feb 07, 2018 2:09 pm ...I've noticed that if I turn the key to position 2 and wait 8-10 seconds, it starts up perfectly every time. Less than that, and it usually takes a long time to start. Did I get a bad fuel pump or something?
Fuel system is priming just for 2-3 seconds when key is in pos.II....after that the relay cuts off.
That said....when key is in pos.II,fuel pump runs ONLY for 3 seconds...after 3 seconds...you can wait as much as you want and that wouldn't/shouldn't make the difference in fuel pressure.
I guess that there are some electrical gremlins in the system.
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RickHaleParker
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Re: Long Cranking Time on 99 S70 GLT

Post by RickHaleParker »

after 3 seconds...you can wait as much as you want and that wouldn't/shouldn't make the difference in fuel pressure.

If the fuel filter is restrictive, fuel pressure in the rail will continue to build up after the fuel pump shuts off, the fuel needs to work through the restrictive filter.

A restrictive filter can act like a delay ... any restrictions can act like a delay.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD.
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.
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Re: Long Cranking Time on 99 S70 GLT

Post by misha »

RickHaleParker wrote: Wed Feb 07, 2018 3:27 pm If the fuel filter is restrictive, fuel pressure in the rail will continue to build up after the fuel pump shuts off, the fuel needs to work through the restrictive filter.

A restrictive filter can act like a delay ... any restrictions can act like a delay.
Cricket502 wrote: Sun Jan 14, 2018 3:24 pm ... so I replaced the fuel pump and fuel filter.... I still have the long cranking problem...
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS
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