mr.300

65 Chrysler 300 , car was running fine then it just started running rough plugs are new wires are new no vacuum leaks is it possible the timing suddenly jumped? car "chugs" at low speed, any ideas?

Archer

300 -

Almost anything from a spec of dirt in the idle circuir in the carb to a blown diode in the alternator. (The last one really surprised me...)

Does it get worse under load (physical or electrical)?

Is it all the time now or does it come and go?

Does it run file as you increase the throttle?

Have to checked the timing yet?

If the dizzy is locked down, a slipped timing chain is possible.

I know nothing about points, but you said the wires and plugs are new, if you have points, did you change those too?

Just a few things off the top of my head.

Archer

mr.300

car runs better the faster i go, points are new also. no i havnt checked the timing yet havent had a chance

Silverick

Yes, the timing could have jumped but, it could be as simple as the condenser went bad. I've had brand new condensers that were bad right out of the box.

mr.300

ahh maybe the condenser went i did just change it but who knows and ill check the timing tomorrow

bremereric

On another note you wouldn't happen to be Mr340's son. The one with the little hammer. He will probably for asking.

mr.300

hahah nope sorry

mr.300

ok not the condenser, going to change the plugs and then the coil. we shall see

bremereric

How many miles on the motor and have you checked the timing yet?

mr.300

timing is OK and there is about 45000 on the motor. car still runs OK even though its misfiring so i don't think the timing chain jumped. its probably something simple I'm just over looking. i just changed the carb but it wasn't the culprit

bremereric

What is the timing?

mr.300

10 deg

mr.300

tried advancing it and retarding it still missed just at lower or higher rpm

mr.300

just for the hell of it i started it and started pulling plug wires off the dizzy and it seems I'm not firing on 1,3,4. when i pulled these wires there was no noticeable change in the motor

Archer

300 -

And what does the inside of your distributor cap look like? (Are there equal burn tracks on all the terminals?)

You said the wires are new. Did you assemble them and is there a chance of a bad crimp on the wires in question and have to ask this (because I did it once), are you sure the wires in question were fully snapped on the plugs?

Archer

mr.300

cap is fine wires are 6-7 weeks old so... issue is only 2 days old. wires all connected firmly

mr.300

so it stands to reason spark at dist and no spark at plug = bad wire or plug

mr.300

correct?

Archer

300 -

I'm hardly an electrical expert, but if 3 wires are consistently not firing and 5 are, it's gotta be the wire or the connection on either end.

Archer.

mr.300

ok im going to put different wires on those three and see what happens

mr.300

one wire burnt through from exhaust manifold . other two seem to be OK but replaced them anyway #1 now firing 3 seems to be firing also but I'm not sure on #4 still no noticeable change when i pull the wire still seems to be running rough.

bremereric

How about firing order?

mr.300

don't know why that would have changed but ill check it out

mr.300

im looking at my service manual and the numbers dont correspond whit what i have could the after market dist have somthing to do with that? im afraid to change them and then ill never get them back the way they are lol

mr.300

what the heck is going on i had a "guy replace the dist about 6 months ago could he have buggered it up this bad ?
is it possible he installed the dist wrong and then wired it so it would run?
it did take him extremely long to do any opinions?

Archer

300

Do you know how to find TDC/on compression on cylinder #1? If not, a google search will help. Then check the firing order and rewire the distributor if necessary.

And no, unless you're using a rectifier type dizzy (not even sure if they make them for Mopars, an after market dizzy can't change the firing order.

If the guy who put the dizzy in messed it up, it should have been apparent the first time you tried to accelerate, if not just at idle.

Archer

Silverick

Maybe the #4 plug is fouled.