Just had the ecu chipped and dyno tuned 2 weeks ago
Was running great to 8500 rpm when took car home on trailer (race car)
A week later at the race I noticed it busting up at around 7000
I put ngk plugs and wires on it

It still has a weird random misfire at any rpm it can randomly sound like a Wrx or could run clean till 7k and then bust up
Vtec IS engaging I hear it plain as day,
I've heard coil ignitor Injectors main relay , is there a way to troubleshoot instead of buying all those expensive parts ?
No dash so can't check for a cel
But I hear vtec engage which tells me likely
No cell

 

Start with replacing your cap and rotor. They're cheap. If you haven't replaced them with good, new, OEM pieces within the past year, just go ahead and do it.

 

I second this, that's where I would start ask a buddy to borrow his or go out and buy it and if that doesn't make a difference just return it and claim it didn't fit correctly I've done it they'll take it back no problem

 

Anywhere I can get good OEM cap and rotor besides the dealership?

 

Yes lots

https://honda-tech.com/honda-civic-d...-list-2059889/

I guess they are still dealerships, but they sell at wholesale prices to the public

 

what is your spark plug gap, and is this na or turbo, sounds like heat soak messing up your coil or ignitor if not plug gap

 

Got to looking at things closely today the distributor cap was missing two of the three screws that hold it on when I removed it the rotor button the screw that holds it in was missing also I don't know if this could cause it to do what I am saying but I am going to remedy the missing screws and see what happens

I had the same problem before and after I changed spark plugs I bought the expensive NGK plugs and it still does it

 

Actually yes it can cause you to misfire, had that happen to my sister when I forgot to tighten down the cap one time and she was freaking out.

 

Bought this car already swapped
I was gonna put a new cap and rotor on it
But the ones from oreilleys AND the dealership do not fit properly
I was told it's an obd2 dizzy from a 99 si

I need to do a tuneup on it and can't figure out what dist this is

 

What motor is it attached to? What's the plug on it?

 

I'm not good at identifying what gen
But I wS told it's an obd1 b16

Obd2 injectors obd2 dizzy
Chipped ecu on neptune

 

Plug on the distributor. Take a picture. Post said picture.

 

Posted

 

Still skipping , put new rotor on
Compression check 180 across the board

Very random skip comes and goes at odd intervals
And busts up around 7k

Possibly have another distributor tonight

 

I was going to say check your coil and icm, check for old gas if the car sat for a while.

 

It's an OBD2 B series VTEC ECU. The cap makes me believe it's the distributor off a B16A2, but it doesn't really matter that much - B16 and B18C1 distributors are cross-compatible, as long as you stay within OBD range.

Also, your cap is missing it's top left screw. You should fix that before it causes you major problems.

 

So, you said you're running it up to 8500, which is past stock, so what all, exactly, do you have going on under your hood? What do you have your plugs gaped to?

 

Gsr cams type r springs the tuner decided 8500 should be rev limit
It's getting better but def cutting out at 7000
Trying to post video

 

And no FI, correct? I was thinking you might be blowing out the spark, but without FI, that's kinda hard to do...

What color is your spark?

 

crappy upside down video
this was actually a good run
a couple after this busted up way worse listen to it after I hit 2nd

https://www.youtube.com/watch?v=NTzG...ature=youtu.be

 

I went to get a new cap from the honda dealership and it wouldnt fit correctly
asked for a 99 civic si cap

how bad are aftermarket Ignitors and coils

I need something asap

 

What motor did you get the cap for?

Before you worry about replacing anything, you need to do some basic diagnostics. It would also be a good idea to get both of your threads merged.

 

1999 Civic SI

 

So far I've changed the rotor new ngk plugs ngk wires
Couldn't change cap because none fit(even from honda)
Changed ignitor and the coil and it ran exactly the same
Did 3-4 test runs and then it went from a random miss to a full skip

I'm starting to wonder about the injectors
Not sure what else to try

 

What color is your spark on all four leads?