Dead spots

[grahamb]

Hoping someone might be able to give me some info.
Last few weeks iv been noticing what i suppose could be called dead spots through the rev band
as im driving really noticible around 50/60% throttle the car feels like its accelerating and pulling back on and off like its struggling or being choked of either fuel or air
Kinda hard to explain I think it might be either a fuelling or spark problem
Anybody have any ideas or experienced this before ?
Thanks for any info
Graham

 

[oifovo]

As you already said it sounds like either fuelling or spark. I would start with the simplest and cheapest - new fuel filter and new dizzy cap/rotor.

 

[graham]

is your car standard or has it been remapped? Ive had mapped cars do this, just down to crap generic maps. As above if not though, could be something simple too - start with cheap jobs!

 

[EK4 Luke]

if it's really hesitant it's could be dizzy as that's how mine felt before dizzy failed then it wouldn't do anything of course

 

[ijwhiteman]

Could also be TPS... Or a number of other things, fuel filter, plugs, dizzy, ht leads/coil packs, lamba sensors the list is endless.

More info required what car is it? What rpm? Mileage?

 

[grahamb]

Car is mapped but it's running the same if not worse on the standard ecu
It's a b16a2 with all bolt on's and cams
Seems to be most prominent around 3-6000 revs
Engine has about 70k miles
Ps.its worth noting that this doesn't seen to be happening all the time , occasionally (maybe once in 15 drives it seems to be fine)

 

[grahamb]

Replaced dizzy cap , rotor arm , plugs and leads today and still the same . gonna try the fuel filter when i have the cash , cheers for the advice