[DMCForum] Re: Yet more ignition analysis:

["content22207" <brobertson@xxxxxxxxxxxx>]

Here's something to try: temporarily disconnect your charcoal
canister. Purge line is activated by vacuum ported from the throttle
plates.

Along the same line, ensure your PCV system is totally clear. Clogged
PCV valves cause all sorts of mischief (I know we don't have a valve,
but SOMETHING'S going on inside that thing on the driver valve cover).

Why don't you temporarily disable every form of fuel enrichment to
definitely eliminate that as a possible cause. Unplug the cold start
injector at the same time just in case some sort of wierd short is
grounding it (your throttle linkage isn't rubbing against any wiring,
is it?).

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, "cruznmd" <racuti1@xxxx> wrote:
> For all my testing, I haven't figure out much...I can only say what I 
> think the problem -isn't-. It is NOT:
> 
> 1. coil
> 2. dist cap
> 3. rotor
> 4. ballast resistor
> 5. ignition ECU
> 6. pulse coil (90% sure)
> 
> What I do know is that if you press the pedal past a certain point, 
> the acceleration curve "snaps" flat, and the engine makes a bogging 
> sound. If you let up on the pedal, the sound "snaps" off and you have 
> smooth, if somewhat shallow acceleration.
> 
> I am now not ruling out the spark plug wires even though they are 
> mostly new. I have not ohm'd them out to see what resistance they 
> offer, so they are suspect.
> 
> So let's discuss: What happens when you depress the accelerator pedal 
> 1/2-2/3 of it's total travel?
> 
> 1. Timing advances a certain number of degrees (or should).
> 2. When cold, the CPR delievers a fuel spike.
> 3. The metering plunger in the fuel dist. delivers more fuel.
> 4. The pulse coil is spinning faster, delievering faster, more 
> powerful pulses to the ignition ECU.
> 5. The ECU is converting these pulses to coil control signals.
> 6. The coil is outputting pulses to the distributor.
> 7. Pulses travel to individual plugs via the rotor.
> 8. Voltage is being fed to the coil primary windings.
> 9. More air is being drawn into the engine. (I have a clean, K&N 
> filter installed)
> 
> What else happens? Inputs welcome.
> 
> Rich A.
> #5335

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