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1998 V70R Random Misfire Topic is solved

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

fitz548
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Year and Model: 1998 V70-XC
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Re: 1998 V70R Random Misfire

Post by fitz548 » Sat May 16, 2020 3:33 pm

I will put this here again in case you didn't read it or overlooked it----------------------did you have your fuel pressure checked at the rail?

Symptoms of a failing crankshaft sensor---- Acceleration Problems

As the engine speeds up, there needs to be adjustments to spark timing and fuel injection. Without accurate input from the crankshaft sensor, the engine control unit (ECU) can't make these adjustments as well as it should. This can result in slow or uneven acceleration.
Reduced Gas Mileage

Without accurate timing information, fuel injection won't occur as efficiently as it should. That means the engine will need to use more gas and your morning commute will use up more fuel than usual.
Engine Misfires

Lack of proper spark timing can cause a different problem: one or more of the cylinders may misfire. That is to say combustion may be disrupted. You will feel, and maybe hear, this as a brief stutter in the engine.
Rough Idling

You might feel that the engine runs rough or vibrates at idle, say, when you're sitting at a red light. This is similar to the above in that it stems from poor spark timing.
Stalling

As seen with rough idling, sometimes crankshaft position sensor problems are worse at low engine speeds. Sometimes the engine might even stall out entirely at low speed if the fuel injectors aren't giving it the fuel it needs.

fitz548
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Re: 1998 V70R Random Misfire

Post by fitz548 » Tue May 19, 2020 6:28 pm

Hey so whats going on with this vehicle you get the issue resolved or still having problems?

Mriv1998
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Re: 1998 V70R Random Misfire  Topic is solved

Post by Mriv1998 » Tue May 19, 2020 6:32 pm

Been driving it around all day with a new crank sensor and spark plugs also changed the oil. So far so good fingers crossed still. Was able to drive it up to 85 And hi revs with out a misfire. We shall see...

Mriv1998
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Re: 1998 V70R Random Misfire

Post by Mriv1998 » Tue May 19, 2020 6:32 pm

*also new pcv

fitz548
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Re: 1998 V70R Random Misfire

Post by fitz548 » Wed May 20, 2020 12:41 am

Good deal man you see even though you didn't get a code for this crank sensor they usually give out a code when they go out it get can confusing when there is no code just like in my situation same thing misfires every cylinder i replaced the crank sensor and its been running great ever since.

Mriv1998
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Re: 1998 V70R Random Misfire

Post by Mriv1998 » Wed May 20, 2020 4:22 am

Hoping for the best this time around lol but I really appreciate all the input from everyone

fitz548
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Re: 1998 V70R Random Misfire

Post by fitz548 » Sat May 23, 2020 3:23 pm

Good deal man glad this solved your issues its really ironic when you dont have a check engine code specifically for the crankshaft position sensor and then you replace it and everything clears up.

Mriv1998
Posts: 26
Joined: Wed May 06, 2020 3:35 am
Year and Model: 1998 V70 R
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Mriv1998

Re: 1998 V70R Random Misfire

Post by Mriv1998 » Sat May 23, 2020 4:47 pm

Yea doing the relay next to be safe since it’s literally right there then I’m going to finish the rest of the stage zero stuff... I really want it to run well so that hopefully someday it becomes a project

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