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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Radio Joe]
#370419
07/10/09 11:11 AM
07/10/09 11:11 AM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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pull the drivers side valve cover, start it up and see if there's any valves either stuck open or not opening (wiped cam)
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: dave571]
#370420
07/10/09 06:47 PM
07/10/09 06:47 PM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
OP
member
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OP
member
Joined: Feb 2007
Posts: 90
Laurens, SC
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Quote:
Broken intake valve spring is a possibility. The dampener and reminants of the spring would keep the valve closed and operating at starter speed. or turning over by hand.
Then when you run it, it'll bounce. Push on the rockers by hand. If you can move a valve up and down, you know what it is.
FWIW, I've seen it more than once. 
I think this may be it!
I pulled the drivers side valve cover whiel the engine was hot and pushed (with a glove on) on the rockers- I could get almost ALL of them to move atleast 1/8 of an inch without too much effort.
I have exp with cehvy but this is my first Mopar engine. On a chevy you cant push springs like that. If its the same on the Mopar then we may have found it.
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Radio Joe]
#370421
07/10/09 06:54 PM
07/10/09 06:54 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
super stock
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super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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Quote:
Quote:
Broken intake valve spring is a possibility. The dampener and reminants of the spring would keep the valve closed and operating at starter speed. or turning over by hand.
Then when you run it, it'll bounce. Push on the rockers by hand. If you can move a valve up and down, you know what it is.
FWIW, I've seen it more than once.
I think this may be it!
I pulled the drivers side valve cover whiel the engine was hot and pushed (with a glove on) on the rockers- I could get almost ALL of them to move atleast 1/8 of an inch without too much effort.
I have exp with cehvy but this is my first Mopar engine. On a chevy you cant push springs like that. If its the same on the Mopar then we may have found it.
Is it the lifters that you are getting to move, or the valve springs?
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: MoparJ]
#370422
07/10/09 06:57 PM
07/10/09 06:57 PM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
OP
member
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OP
member
Joined: Feb 2007
Posts: 90
Laurens, SC
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Quote:
Quote:
Quote:
Broken intake valve spring is a possibility. The dampener and reminants of the spring would keep the valve closed and operating at starter speed. or turning over by hand.
Then when you run it, it'll bounce. Push on the rockers by hand. If you can move a valve up and down, you know what it is.
FWIW, I've seen it more than once.
I think this may be it!
I pulled the drivers side valve cover whiel the engine was hot and pushed (with a glove on) on the rockers- I could get almost ALL of them to move atleast 1/8 of an inch without too much effort.
I have exp with cehvy but this is my first Mopar engine. On a chevy you cant push springs like that. If its the same on the Mopar then we may have found it.
Is it the lifters that you are getting to move, or the valve springs?
Its for sure the spring/valve moving. not the lifter. the valve is closed and I push on the rocker above it and it pushes the valve open
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: FuryUs]
#370425
07/10/09 08:42 PM
07/10/09 08:42 PM
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Joined: Aug 2006
Posts: 1,609
Southern Cal
Noblewk
top fuel
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top fuel
Joined: Aug 2006
Posts: 1,609
Southern Cal
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Vacuume issue! Power brakes? If so check the line. If not you may have an internal vacuume leak on the intake gasket. A V8 will not run on 4 cylinders on the highway. Pull all 4 plugwires and try to drive it.
66 Dart GT, 402 11.18:109 Best
63 1/2 Galaxie 500XL 406 4Speed 13.20:103 Best
2000 Ram
2005 Durango Hemi.
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Radio Joe]
#370426
07/10/09 09:06 PM
07/10/09 09:06 PM
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Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
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I'm totally reaching but... Is it possible that the valves are tight on just that head? Tight enough so when the lifters are pumped up the valves are not closing yet when you do a compression check the valves don't pump up enough to show up as bad compression? 
Allen
Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first.
Life was a little easier when I was just a wrench.
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: MoparforLife]
#370428
07/11/09 12:31 AM
07/11/09 12:31 AM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
OP
member
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OP
member
Joined: Feb 2007
Posts: 90
Laurens, SC
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Quote:
It doesn't surprise me that you can do this. Stock 318 springs are pretty wimpy and especially with age. I don't feel that this is our problem though. It may cause a high RPM miss do to float but idle should be uneffected. Also it would not effect the whole side.[/qoute]
Well CRAP I was hoping this was it... I did think it would effect it more at higher rpms but was hoping...
Quote:
The ONE thing that's common on all the driver's side cylinders but not with the passenger's side is the exhaust pipe leading to the Y.
I checked the exhaust- no obstructions.
Quote:
Vacuume issue! Power brakes? If so check the line. If not you may have an internal vacuume leak on the intake gasket. A V8 will not run on 4 cylinders on the highway. Pull all 4 plugwires and try to drive it.
Someone on the H.A.M.B suggested an intake vac leak in the valley. I changed the intake gaskets. The intake didnt look machined or warped but... How would I check for a leak under the intake???
Quote:
My question is - Did this thing run good at one time and just st art this?? What did you do to the engine prior to it doing this? Did you change anything??
I had major carb problems- bent parts from a previous owner. After getting it fixed it ran okay. Not much low end power but seemed fairly smooth. Only a slight miss that was very hard to hear. It started getting worse for no reason at all. When I started looking into it, thats when I found the 4 cyls not working...
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: MoparforLife]
#370430
07/11/09 09:27 AM
07/11/09 09:27 AM
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Joined: May 2007
Posts: 1,675
Mi.
G-Money1320
top fuel
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top fuel
Joined: May 2007
Posts: 1,675
Mi.
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Ok I wasnt going to chime in here as I really had no answer to what your problem might be,but after a little thinking here is my In your first couple posts you indicated that the left bank wasnt working at all, you said that you put a plug in the wire and checked for spark and had it! So what makes you think that the whole drivers side isnt working? If the plugs are firing and correctly then the cylinders are working in that aspect. All the responses to the fact of a vaccum leak and bad carb are not going to be the answer as that would affect how the whole engine operates not just 1 bank. I had a 72 Firebird many years ago that I did a tune up on, the car fired right up but upon revving the motor it had a miss and ran rough,well guess what, I had left all the left side wires laying across the top of the motor. I was amazed it ran at all with only 4 cylinders firing. You said it ran fine at higher RPM's. I guess if the motor has sat for any amount of time then the springs that were compressed might not be closing those valves properly. Or another situation could be the use of unleaded gas has buried the exhaust valves into the seats causing a loss of compression??
416 stroker from Nick at Compu-flow. 11.14 in full street trim. Seems like a new best every time out.
11.06 open headers----so far!!
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: MoparforLife]
#370431
07/11/09 04:59 PM
07/11/09 04:59 PM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
OP
member
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OP
member
Joined: Feb 2007
Posts: 90
Laurens, SC
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Quote:
Hey Joe: Tray as one person above said. Pull all for effected wires at one time, try move it. See if they are really totally missing.
I know that you have checked and re checked this too, but rtrcrck the firing order and remember that the wires go clockwise around the cap.
Check your egr valve.
I have been giving this alot of thought- One thing I thought of is since shorting the drivers side ires doesnt effect idle I thought what is I pull all the pass side wires and see if it still runs. I know it will if i pull all the drivers side but I think it will die if I pull all the passenger side wires....
I'll try both ways and let you know what I find.
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Mr.Yuck]
#370436
07/13/09 03:43 PM
07/13/09 03:43 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
super stock
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super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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Quote:
orange seems like a weak sprk. You wnat a nice blue jolt. What are your plugs gapped at/ I'd think .035-.040 should work. Try a new "hot" coil.
I am tending to think that this may be electronic or ignition related.
Is this a points type ignition or electronic?
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: buildanother]
#370437
07/13/09 03:44 PM
07/13/09 03:44 PM
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Joined: Feb 2008
Posts: 992
Simi Valley, CA
MoparJ
super stock
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super stock
Joined: Feb 2008
Posts: 992
Simi Valley, CA
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Quote:
Did you try up to this point, slowly covering the top of carb with your hand while it's idling, to see if it smooths out and rpms come up? 
Also something to try to help pin point possible vacuum or carb issues.
2016 Ram 1500 Crew Cab: 5.7, 65RFE, 4.56 gears with locker, Hemifever tuned, AFE intake, 87mm throttle body, JBA headers, 3" Flowmaster exhaust, split to dual 2.5" exits. 13.57 best ET so far.
Searching for new A or B Body Project!
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