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

OneRanger · Post by **OneRanger** » 15 Nov 2018, 18:09

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..

WhatAmIDoing · Post by **WhatAmIDoing** » 15 Nov 2018, 18:50

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.

OneRanger · Post by **OneRanger** » 15 Nov 2018, 19:31

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?

Post by **jimmy57** » 15 Nov 2018, 20:10

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

OneRanger · Post by **OneRanger** » 17 Nov 2018, 01:07

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

OneRanger · Post by **OneRanger** » 17 Nov 2018, 01:08

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

WhatAmIDoing · Post by **WhatAmIDoing** » 17 Nov 2018, 01:45

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

Post by **jimmy57** » 17 Nov 2018, 07:50

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.

Post by **rspi** » 17 Nov 2018, 08:55

How old are the ignition components?