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Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

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.

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OneRanger
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Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by OneRanger » Thu Nov 15, 2018 6:09 pm

Im having a hiccup in my 1998 v70r in the 2000 to 2500rpm range only..any other time its fine..it doesnt do it when completly cold..2 mins in if i hit that rpm range to shutters or hiccups..anyone got a cure or idea of whats going on? No codes show up at all..



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Re: Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by WhatAmIDoing » Thu Nov 15, 2018 6:50 pm

How old are your ignition components: cap, rotor, wires, plugs? Could be fuel pump relay on its way out (especially KAE). Maybe the ECT is reading wonky. MAF sensor is also a likely suspect. Also check all induction and vacuum lines, as small cracks can cause poor performance.


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OneRanger
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Re: Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by OneRanger » Thu Nov 15, 2018 7:31 pm

K thx..my other question is if any of the is the problem why does it only effect it in the 2000 to 2500 rpm range?



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Re: Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by jimmy57 » Thu Nov 15, 2018 8:10 pm

when there is a distributor involved the rotor and contacts in cap for the plug wires are not in alignment when timing is advanced or retarded a lot. The gap the spark jumps is larger and it will jump across a track in cap to another plug wire contact if the correct plug wire has resistance. Required firing voltage is not a constant and is higher for richer mixture. When the voltage builds to ionize the gap between plug electrodes and that is compounded by plug wire issues the current will find a lesser required voltage path.
Does it do this when accelerating or at steady cruise in that range
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OneRanger
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Re: Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by OneRanger » Sat Nov 17, 2018 1:07 am

Only usualy when accelerating and only 2000-2500 range ..its only its kinda crazy



OneRanger
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Re: Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by OneRanger » Sat Nov 17, 2018 1:08 am

Only usualy when accelerating and only 2000-2500 range ..its only its kinda crazy



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Re: Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by WhatAmIDoing » Sat Nov 17, 2018 1:45 am

That would point to worn / dirty components as outlined above.


'98 S70 T5M - 270,000+mi - forever a project
'99 S70 "AWD" - 218,000+mi - project
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Re: Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by jimmy57 » Sat Nov 17, 2018 7:50 am

Fits with bad wires and tracked cap. You can probably see if it you remove distributor cap. Replace rotor too as those can track through rotor and ground to driving shaft.



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Re: Im having a hiccup at 2000-2500 rpm range on my 1998 v70r

Post by rspi » Sat Nov 17, 2018 8:55 am

How old are the ignition components?


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