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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:
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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: 20,640
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: 20,640
in a cattle trailer down by th...
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Quote:
Quote:
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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?
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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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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Re: What should I check next?
[Re: sixpackgut]
#1408117
03/25/13 11:06 PM
03/25/13 11:06 PM
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Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
rickstershemi
master
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master
Joined: Jul 2006
Posts: 9,366
Lehigh Acres, Florida
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i broke 3 fins (for lack of a better term) off the reluctor in my MSD Dizzy once after a hard landing on a higher than normal wheelie.....instantly ran like crap with three cyl down...????
Rickster
 amazing
go figure.....found three cold header tubes trying to figure it out and when we went to ck the cap/rotor....found them lying in the dizzy MSD did swap out a brand new dizzy at zero cost 
Rickster
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Re: What should I check next?
[Re: 70Dart499]
#1408118
03/25/13 11:29 PM
03/25/13 11:29 PM
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Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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Quote:
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.
from your description the head gasket would be my first guess, if this has aluminum heads the head may need repair.
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Re: What should I check next?
[Re: poppaj]
#1408120
03/26/13 01:08 AM
03/26/13 01:08 AM
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Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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I still would think it is ignition, sounds like is not firing on those cylinders at all. I would change cap,rotor and wires first. A blown head gasket would more than likely have water in the oil or be throwing some water out the headers. poppaj 
not if it's blown between the cylinders which is a common failure point...no water there
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Re: What should I check next?
[Re: RodStRace]
#1408122
03/26/13 08:52 AM
03/26/13 08:52 AM
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Joined: Nov 2009
Posts: 2,177
ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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Start with timing,and rotor phasing!! bet the spark is 'blowing off, balancer may have slipped as they do and thus the spark blow off,
start from fresh pull it upon number 1 , check the balancer!!!!
then the rotor phasing!!
I will bet you have more than 1 or 2 cyl that is running colder!!
Last edited by dennismopar73; 03/26/13 08:55 AM.
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Re: What should I check next?
[Re: jamesc]
#1408123
03/26/13 09:28 AM
03/26/13 09:28 AM
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Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
CHAPPER
master
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master
Joined: Nov 2009
Posts: 3,410
Belpre,Ohio
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Quote:
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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.
from your description the head gasket would be my first guess, if this has aluminum heads the head may need repair.
 If #4 and #6 plug wires aren't crossed, I would suspect the head gasket blown between those cylinders.
If you like drag racing, support your local track.
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Re: What should I check next?
[Re: CHAPPER]
#1408124
03/26/13 09:49 AM
03/26/13 09:49 AM
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Joined: Dec 2009
Posts: 20,640
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: 20,640
in a cattle trailer down by th...
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Quote:
Quote:
Quote:
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.
from your description the head gasket would be my first guess, if this has aluminum heads the head may need repair.
If #4 and #6 plug wires aren't crossed, I would suspect the head gasket blown between those cylinders.
I guess I read it wrong, I thought it was 2 & 6, I would have to agree, do a compression test. All the other ignition stuff would affect other cylinders also, not just 2. Process of elimination, eliminate everything else except what would only affect 2 cylinders, and in this case 2 adjacent cylinders.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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