Shaw14

So my car engages vtec at 5100 revs to 9 but once in vtec stutters on it self bad cleans out some but not all the way its a b16a2 tuned on neptune could it be bad fuel like i said only back fires and misses when locked in vtec.

delsolproblems

Check your plugs. Compare them with a plug wear chart and post the results.

airric

bump for the same problem, A friend of mine said he thinks its the dizzy... try changing the cap and rotor.

apexi_rsx

i could recommend changing the cap and rotor. or clean the cap and rotor and see if it helps at all. scrapping the post off and the edge of the rotor

delsolproblems

Missing only in Vtec is not an ignition problem so you should be able to rule out that entire system. The ignition receives more voltage as RPM increases, which is why ignition problems almost always present with at least slight idle problems. Make sure that heat, including both environmental and engine heat, isn't a factor with your problem. Once that's out of the way, you're looking at a timing, fuel or control problem. Control meaning the sensors or ECU programming. Aside from checking the plugs, you may want to borrow a fuel pressure test kit from a parts store and check your fuel pressure with and without the regulator vacuum hose attached to see if you are pushing enough fuel to supply vtec operation.

Smartype r

how do you know if the car is miss firing?
?

94_DC

That was the problem in my Y8, changed the Igniter and it was fine.

OP, if you want to come to Federal Way, I have parts to fix it.

phaphon

it can be your valves need to be adjusted or is bent

94_DC

Forgot to ask, is your rpm gauge jumpy?

Jasonx056

def plugs dizzy cap rotor i had the same problem with my car

sleepy5950

i have a misfire and my rpm gauge jumped around once on a few pulls today with no CEL code. what is it????

motegicivic

Alot of times could be the wires.

Former User

I would focus first on the ignition system (plugs, wires, cap, rotor, coil, ICM) and ignition timing. Any CEL codes?

Oops - old thread closed.