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What should I check next?
#1408097
03/24/13 06:24 PM
03/24/13 06:24 PM
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Joined: Jul 2012
Posts: 153
Plant city fl
70Dart499
OP
member
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OP
member
Joined: Jul 2012
Posts: 153
Plant city fl
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I'm having a problem with the car, and I need some help with a possible diagnosis. I went to the track yesterday for a two day race, and the car ran great all day, but then this morning on the first time run, the car broke up really bad and almost died, I thought maybe a plug wire was off, so I checked & the wires were fine, I pulled the front and rear bowls off to check for trash, I found a couple of very small pieces, so I thought maybe that was the problem, so I went up for the next time shot and the car almost died when I hit the gas and would barely run under any amount of throttle. talked to a knowledgeable local engine builder, & he suggested we check for a broken valve spring, we did, and they were all OK. I loaded up and came home, changed the plugs which were old, an that didn't help much either, I have a temp gun, so I went around and checked all of the headers and I found that #4 & #6 are cold and apparrently not firing. Question is what else should I check, the plug wires look OK from the outside, so what is the next thing to check?
1970 Dart Drag Car
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Re: What should I check next?
[Re: 70Dart499]
#1408099
03/24/13 07:51 PM
03/24/13 07:51 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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It sounds like a ignition problem more than anything.. start checking ALL of the ignition system.. I would look at the coil first.... JMO 
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Re: What should I check next?
[Re: MR_P_BODY]
#1408100
03/24/13 08:30 PM
03/24/13 08:30 PM
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Joined: Jul 2012
Posts: 153
Plant city fl
70Dart499
OP
member
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OP
member
Joined: Jul 2012
Posts: 153
Plant city fl
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You guys are pretty much thinking the same thing that I was. I couldn;t belive it, the car ran great yesterday, and then this morning, it just ran like crap. It did pop through the exhaust a few times yesterday in the shutdown, but I just figured that it was becuase I hadn't changed the plugs in a while. Maybe it was a warning sign?
1970 Dart Drag Car
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Re: What should I check next?
[Re: 70Dart499]
#1408106
03/25/13 12:09 PM
03/25/13 12:09 PM
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Joined: Mar 2010
Posts: 632
MD-USA
Dodgeguy101
mopar
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mopar
Joined: Mar 2010
Posts: 632
MD-USA
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Quote:
Quote:
did you look at the plugs.somtimes that can tell you alot.
Yes, that was one of the first things I did, the dead cylinders looked wet and the others just looked old and due for a change. I changed all the plugs out, and the two dead holes didn't pick up. I'm going to start out by changing the wires on the two dead holes, and if that doesn't help, I've got a spare coil I'm going to try. If none of that works I guess it will be on to the distributor.
I would think if it was a coil, the problem wouldnt be the same 2 cylinders having a problem. Something mechanical, 
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Re: What should I check next?
[Re: Dodgeguy101]
#1408107
03/25/13 12:21 PM
03/25/13 12:21 PM
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Joined: Dec 2009
Posts: 20,655
in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,655
in a cattle trailer down by th...
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Quote:
Quote:
Quote:
did you look at the plugs.somtimes that can tell you alot.
Yes, that was one of the first things I did, the dead cylinders looked wet and the others just looked old and due for a change. I changed all the plugs out, and the two dead holes didn't pick up. I'm going to start out by changing the wires on the two dead holes, and if that doesn't help, I've got a spare coil I'm going to try. If none of that works I guess it will be on to the distributor.
I would think if it was a coil, the problem wouldnt be the same 2 cylinders having a problem. Something mechanical,
Could be the cap or wires, did you look at the cap for carbon tracking? Could also be a vacuum leak, intake gasket maybe?
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Re: What should I check next?
[Re: bonefish]
#1408111
03/25/13 01:32 PM
03/25/13 01:32 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
put an old plug in the wire then ground it and have someone turn it over and see if it sparks.first disconect the other wires from the dist.so it doesnt start.
yeah start at the easy place 1st. If you had a broken spring or wiped cam you hear some etra noise, you can also pull ur dip stick and see if it has some "glitter" on it.
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Re: What should I check next?
[Re: Mr.Yuck]
#1408112
03/25/13 10:01 PM
03/25/13 10:01 PM
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Joined: Jul 2012
Posts: 153
Plant city fl
70Dart499
OP
member
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OP
member
Joined: Jul 2012
Posts: 153
Plant city fl
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Check the ignition stuff over this evening, and everything seems OK, I'm borrowing a leak down tester from a friend tomorrow, and we are going to check the comp. Im thinking its a blown head gasket since the two middle cylinders are dead. I'm kind of hoping thats all it is, becuase I can fix it in one or two evenings work.
1970 Dart Drag Car
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I hope all is good 
amazing