Afm Help

[Marcus89]

Hey,

My r34 recently developed a hesitation around 5krpm to around 5500rpm and I believe it is most likely the afm. Is there anyone in Brisbane area that has a spare afm or working one that I can test to see if this is definitely the problem? Let me know would like to confirm the issue asap should be a 6 pack in it for whoever helps.

Thanks

[Jay11]

You've definitely checked your spark plugs?

Mine was doing a similar thing and it was the plugs.

[Col-GTSX]

AFM will play up from 1000rpm right through to red line...

if its only missing at higher rpm it will be a broken coil pack or plug health/gap...

[Marcus89]

Ah ok yea i was little unsure about that. I'll change my plugs and if that doesn't sort it get some new coilpacks

[Col-GTSX]

Usually if its a coil pack you can see the damage...

It will fire the spark out the side of the pack to the cylinder head, leaving a "char" mark on the side of the coil pack...

Its easily spotted on the dyno with the lights off, its like a lightning storm under load at 5000rpm...

Just check the plugs and as you pull the coil packs inspect them closely...

A set of platinum plugs will set you back over $100, a set of new coil packs I think are still about $500-$550ish...

Here is way old-school thread i did where I had the same problem on the dyno --> http://www.skylinesaustralia.com/forums/topic/116653-a-day-with-matt-spry/page__hl__matt+spry

[Marcus89]

Usually if its a coil pack you can see the damage...

It will fire the spark out the side of the pack to the cylinder head, leaving a "char" mark on the side of the coil pack...

Its easily spotted on the dyno with the lights off, its like a lightning storm under load at 5000rpm...

Just check the plugs and as you pull the coil packs inspect them closely...

A set of platinum plugs will set you back over $100, a set of new coil packs I think are still about $500-$550ish...

Here is way old-school thread i did where I had the same problem on the dyno --> http://www.skylinesaustralia.com/forums/topic/116653-a-day-with-matt-spry/page__hl__matt+spry

Thanks for that mate. I have heard most people don't bother with platinum and actually prefer using copper plugs and replace them more often.

Haha that thread is awesome epic story man definitely a top rap for Matt Spry also never heard of a shop doing something like that for a customer

[Col-GTSX]

yeah he is pretty good...

you can use copper for sure, no probs...

as you said just change them more often...