Suprsprt454

First time post. I've scoured this site for days looking for the answer but can't get a clear solution. I have a stock as a rock 93 civix si d16z6. The symptoms are as follows:no cel. stumbles on start up. But then catches it's self. At idle sounds like a missfire but still idles smooth except for a slight hic up. At half throttle or more it breaks up. Bucks and snorts but sometimes smooths out if ya backnoff the throttle. This happens across the rpm range. But mostly under half throtle it more or up hills in any gear. What I've done to diagnose. Cap rotor plugs wires fuel filter all have been changed. Checked the fuel pressure regulator. Checked injectors for proper pulse. Cleaned the iac and fast idle and throtlebody of carbon. Checked the pcv. Exhaust is not clogged. Unpuging the o2 map and tps illumintaes the cel but no improvement. Don't know if I should pull the dizzy and test that. Just want some feedback before I get into it. Any thing y'all can do to help is appreciated.

andoxviii

iTrader: (1)

Your cheapest next-step would be fuel injector cleaner. You already covered all the obvious ones: rotor, cap, wires, fuel filter, spark plugs.

The fact that its misfiring makes me think its something spark-related though.

Jockone

Any eveience of track or arc marks on the coil?

Former User

Test the coil, igniter unit, and the mechanical timing.

Suprsprt454

Ronj thanks! I see you post up here all the time and your sound reasoningrid in line. I think I found the tests for the coil and the ignitor. But the mechanical advance I don't know how to check. First time in a Honda dizzy. Also a link to those coil and ignitor test would be fantastic. Hard to get online from a phone. Is there a reference for the spec on those sensors. The cars got 202000 miles. So I'm sure somethin is amiss somewhere. Thanks again!! Y'all are savin my wallet on this one!!

Former User

Many auto parts stores will test the igniter unit free of charge.

Here's info on the coil and mechanical timing:

Suprsprt454

It's it possible for the motor to jump in mechanical timing? Wouldn't the cog timing belt prevent that?

Former User

Happens all the time.

Suprsprt454

I'll keep y'all posted. Thanks for the input so far.

Suprsprt454

So the coil appears to be out of spec. However I will have the module/ignitor tested tonight. The coil was showing 3.0 something ohms resistance and the secondary was showing to be in spec at 13000 ohms But it was sporadic. The reading would come and go. Very hard to get a clean read from the secondary. What y'all think?

Suprsprt454

Sorry 13000-15000 that should have read. For the secondary

Former User

Sounds like the coil is bad.

Suprsprt454

Is it a possablity that either the coil killed the ignition mod/ ignitor? Or vice versa would a bad mod/ignitor kill th coil. And no luck on finding anyone to test the module. Honda is my last resort and I'm sure they won't do it for free. Input appreciated

Former User

How many different auto parts stores did you call about igniter unit testing? Many of the large chains offer this service. Nonetheless, you can start by replacing the coil because you know that it is bad.

Suprsprt454

Christ advanced auto, napa, and a local foreign car parts store. Haven't tried auto zone yet. My only worry is if the module is bad and I've bought a coil now with the module I could almost get a remanufactured dizzy. Should I just crack down and buy a dizzy?

Former User

If that's true, then buy a dizzy.

Suprsprt454

So now I got a new symptom. The frigging tach needle jumps all over when I'm at a steady cruise. The actual engine rpm doesn't change. I may be mistaken but doesn't the ignition module "interact" with the tach in some way. This is driving me nuts any help is so greatly appreciated!!! Please anyone help!!!

Suprsprt454

Allright replaced the dizzy and the thing is still bucking and snorting, Im out of options here!!

andoxviii

iTrader: (1)

On OBD1 distributors, there are two plugs: one with 7 wires and one with 2 wires. The blue wire on the 2-wire plug is the tach wire. Make sure there is a solid connection.

With your new distributor, is the tach still jumping?

Suprsprt454

nope the tach issue has been solved but it still has a miss, the mechanical timing is spot on, Im seriously out of ideas, im stuck dead in the water right now

Former User

Have you checked the ignition timing with a timing gun and the service connector jumped?

Suprsprt454

nope workin on that but cant find the procedure online anywhere

Former User

Suprsprt454

ok so i started from square one with the timing, in the picture showing the setting of the mechanical timing the TDC (white mark) is supposed to line up with the plastic pointer? while the cam is in the up position. If thats the case then the white dot is to the right of that pointer, So to fix it now i take the timing belt of and rotate the crank counterclockwise untill it matches the pointer? then reset the cam to the proper position, reinstall timing belt and then time it with a timing light

Former User

If the timing belt has skipped a tooth or two, it would be wise to install a new belt.