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Author
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Topic: No Spark On #2
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-17-2006 01:04 PM
 
The 68 was running really bad so I replaced the plugs, wires, cap, rotor. Now there is no spark on #2. All other cylinders are firing normally. Any ideas what would cause this? I swapped the wires around and the trouble stays with the cylinder. Firing order is correct. It's an I6 btw.
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Dave Gibson
Moderator Posts: 10769
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99
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posted 09-17-2006 01:33 PM
Dave,
Couple of thoughts for you:
Did you change the points or condenser?? If so, are the breaker points adjusted correctly?? Did you check the new plug??
Are you getting any spark from the wire at the number two plug??Just a couple of ideas. Dave & Terri ------------------
'65 Mustang Fastback
'66 Mustang Coupe
'02 Explorer XLT
Common sense isn't common anymore.
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adragon8u
Gearhead Posts: 5867
From: Oceano, Ca. member# 2895
Registered: Mar 2003
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posted 09-17-2006 02:22 PM
I seem to recall quite a few years back that I had a car with the same symptom. If I held the wire about an inch from the plug it would fire, but not when the wire was attached. Have you tried holding the wire away from the plug and see if it's firing then? Sorry, but I don't remember what I did to correct it though. maybe the wire is being grounded at some point resulting in the misfire?------------------
"Be yourself
everyone else is taken"
http://mustangsandmore.50megs.com/MembersPics/adragon8u.html
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-17-2006 02:35 PM
Here's what I've done since the last post. I swapped the plugs in 1 and 2 and the problem is still in 2. I can hold the wire away from the plug and hear the arc going from the wire to the plug so I'm getting a spark but #2 seems to be dead. Starting to think valve trouble now.
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adragon8u
Gearhead Posts: 5867
From: Oceano, Ca. member# 2895
Registered: Mar 2003
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posted 09-17-2006 02:46 PM
so even with the spark jumping there's no difference in the idle? I.E. it's firing but not "hitting". Another thought, sort of out there but what the hey. My 289 in the old Mustang wouldn't fire on the back 4 cylinders. found a vaccuum leak that was causing the issue. Is there a possibilty that a vacuum leak to just that cylinder might be happening?------------------
"Be yourself
everyone else is taken"
http://mustangsandmore.50megs.com/MembersPics/adragon8u.html
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-17-2006 03:25 PM
Heck, I guess anything is possible but I don't know where a vacuum leak could be since the intake manifold is part of the head.
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-17-2006 04:17 PM
Just did a compression test. 2 is pretty much dead. All other cylinders are reading around 180 but 2 barely moves the needle. There's a definate pulse coming from the exhaust with the gauge in 2 so it looks like a bad exhaust valve. Did the check on sort of warm engine with all plugs removed.
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-17-2006 06:24 PM
Found it!   Push rod is bent too. [This message has been edited by 69 Sportsroof (edited 09-17-2006).]
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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 09-17-2006 06:28 PM
could have been just a little to loose and simply popped off. hope so anyway. does the top of the lifter feel ok when you feel it with the pushrod?------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg
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Dave Gibson
Moderator Posts: 10769
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99
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posted 09-17-2006 08:15 PM
Well you found the cuprit.  Sounds like a good time to rebuild the head and or engine now.  That way you know it's all done and done right. Was getting ready to ask how the '68 is doing. But we now know. Hang in there Dave and get the GRRLS involved with this project.  Especially since one of them wants to drive it to school.Dave & Terri ------------------
'65 Mustang Fastback
'66 Mustang Coupe
'02 Explorer XLT
Common sense isn't common anymore.
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-17-2006 08:31 PM
quote:
Originally posted by capri man:
does the top of the lifter feel ok when you feel it with the pushrod?
I'm not sure what you mean. I picked up a pushrod at AZ and installed it. When I started it back up there was some clicking then the skipping started again. I put my tools up and came inside after that.  I'll start on it again tomorrow when I don't feel like throwing something. 
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-17-2006 08:41 PM
quote:
Originally posted by Dave Gibson:
Was getting ready to ask how the '68 is doing. But we now know. Hang in there Dave and get the GRRLS involved with this project...
Yeah Dave, now you know. The sheet metal for the floor was delivered Friday and I'm trying to get the car running so I can get it to the body shop that's doing the work for me. Had the Grrls out there with me this evening once they got home from shopping.  
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-18-2006 06:07 PM
Ok. Now I have good compression in #2 and both valves are moving freely. What in the world is going on? I'm going to run a magnet into the spark plug hole and see if something got dropped down the carb. We'll see.
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Dave Gibson
Moderator Posts: 10769
From: Norfolk, Virginia, USA M&M#166 MCA#47921
Registered: Aug 99
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posted 09-18-2006 07:38 PM
Very interesting situation Dave.  I think you are on the right track with the magnet. It does sound like something may have been dropped down the carb??!?! Any thing is possible. Keep us posted on what you find please.Good to hear that the GRRLS were out there helping you out. Sounds like you may have to get them to join M&M in the near future. Dave & Terri ------------------
'65 Mustang Fastback
'66 Mustang Coupe
'02 Explorer XLT
Common sense isn't common anymore.
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fred
Gearhead Posts: 184
From: berea ky
Registered: Oct 2004
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posted 09-20-2006 07:20 PM
hi,
Have you checked the compression since you replaced the push rod, it is possiple that the valve hung up and the piston hit and bent it at the same time it would bend or pop the push rod.
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69 Sportsroof
Gearhead Posts: 2814
From: Valley, Alabama, USA
Registered: Mar 2002
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posted 09-22-2006 08:23 AM
I ran a magnet into the cylinder and didn't come up with anything. With the exception of the carb stumble (accelerator pump bad) she's running smooth as silk now. Whatever hung the valve open found its way out and is likely in the exhaust. Compression is ~ 180# on all 6 cylinders now.
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