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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: 1_WILD_RT]
#370401
07/09/09 09:40 AM
07/09/09 09:40 AM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
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Laurens, SC
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Quote:
Do you have access to another carb you could just bolt on to try it... You have the engine in front of you, so you'll know but some of the Polys had manifolds that weren't dual-plane designs... & if thats what you have then the carb becomes suspect.... 
I dont have another carb. The carb is a Holley 2 barrel right now. Manifold for sure is dual plane. One side of the carb feeds the center 2 cyls on one side and the outer two on the other side. Other side of the carb supplies the opposite.
I checked the exhaust and the heat riser is on the passenger side (Good running side) and it is stuck OPEN. The exhaust is single exhaust where the drivers side is welded to the passenger side tube and then they are one tube to the back (Exhaust will be new duals as soon as I stop spending money on this problem)
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: buildanother]
#370402
07/09/09 09:48 AM
07/09/09 09:48 AM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
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Posts: 90
Laurens, SC
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Quote:
You know the 4 cylinders are firing somewhat at some level, as you mentioned driving on expressway.
Agreed! has to be doing something at higher RPM.
I have tried to adjust the carb but it seems to be at its sweet spot right now. I had big problems with it a while back (RapidRobert can attest to that) and completely rebuilt it and fixed some bent butterflies the previous owner had bent.
I have sprayed carb cleaner around the intake, carb, spark plugs and valve covers and the engien speed didnt change. That seems like no BIG vac leak. Only vac ports are on the carb- one for PCV, one for ported (Vac Advance) and one is full manifold vac. All are connected or plugged. I also swapped the vac advance to the full monifold vac at one point but it didnt help.
PCV valve SEEMS to be okay. Its not stuck, valve moves back and forth. Is there a way to test it or just replace?
I really dont want to just throw money at the problem, I want to figure out what is wrong.
I will try to test the valve springs this weekend.
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Mr.Yuck]
#370407
07/09/09 06:30 PM
07/09/09 06:30 PM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
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Laurens, SC
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Quote:
sounds like a fuel problem then.
Not to disregard what you suggest, but wouldnt a fuel problem effect both sides of the engien and not just the drivers side?
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: HealthServices]
#370409
07/09/09 08:09 PM
07/09/09 08:09 PM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
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Laurens, SC
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Quote:
Quote:
Heres what I checked/replaced:
Compression. All cylinders pretty close to 150psi
Sorry to ask/say this but just in case since I don’t know what experience you have with tools and I'm just reaching but... All the compression gauges I seen have a reset to put the gauge back to zero. Did you reset the gauge after each cylinder? 
my guage has a button on the side to release the pressure in the guage and reset it to zero. Did it after each cylinder
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Radio Joe]
#370411
07/09/09 08:50 PM
07/09/09 08:50 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Had a similar issue with a 70's GM station wagon. Pass side was dead, all the plugs were badly carboned over, hooded over actually.
Intake gasket.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Radio Joe]
#370414
07/10/09 08:05 AM
07/10/09 08:05 AM
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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:
Quote:
sounds like a fuel problem then.
Not to disregard what you suggest, but wouldnt a fuel problem effect both sides of the engien and not just the drivers side?
well if you have spark and compression all you need is fuel, since you spark is there and your compression is there that leaves fuel right??? Now I have no idea why or how that it's not. Pull the plugs on that bank turn the engine over a bunch.. you should get fuel pushing out the plug holes..if you do then you have fuel. Are you sure that intake runs both banks from the carb? meaning if you did have an issue w/ the drives side bbl it would run both sides off the pass side?
I only ask because I can't think of any other reason you car shouldn't be running.
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Mr.Yuck]
#370417
07/10/09 09:40 AM
07/10/09 09:40 AM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
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Posts: 90
Laurens, SC
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Quote:
well if you have spark and compression all you need is fuel, since you spark is there and your compression is there that leaves fuel right??? Now I have no idea why or how that it's not. Pull the plugs on that bank turn the engine over a bunch.. you should get fuel pushing out the plug holes..if you do then you have fuel. Are you sure that intake runs both banks from the carb? meaning if you did have an issue w/ the drives side bbl it would run both sides off the pass side?
I only ask because I can't think of any other reason you car shouldn't be running.
The intake is a 2 brrl intake with a adapter to run the holley 2 barrel on it. the intake seprates the carb barrls at the top but the adapter plate leaves a bit of a opening for both sides under the carb. Passenger side feeds cyls 3,5,2,8 and drivers side of carb feeds 1,7,4,6 (I may have that backward but you get the idea).
Im picking up a tach later today and after I test the idle drop as i short each plug wire I can try to remove the carb and spin it 180 degrees and remount. Since I wont need the linkages and can plug the vac ports all I will have to do is extend the gas line a bit. That should confirm or rule out if one side of the carb is causing it.
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Re: 318 only running on 4 cylinders HELP!!!!!!
[Re: Mr.Yuck]
#370418
07/10/09 09:44 AM
07/10/09 09:44 AM
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Joined: Feb 2007
Posts: 90
Laurens, SC
Radio Joe
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Quote:
can I ask, when did this problem start? You said it was running rough before the tune up. Did the tune up make it worse? Do thos 318's have a heat raiser off the exhaust manifold? Is it on the drivers side? Could the "flap" be stuck shut? this would cause the exhaust not to be able to flow, maybe creating some back-pressure issues?
They only other ting would be you have broken valve train problems only on the drivers side, that would be highly unlikely, or it would be unlikely that each cylinder would be effected.
So that brings it back to fuel and spark.
The car always had a very slight loop sound at idle while in gear and on the brakes. Barely noticeable. When it started gettign worse about a month ago I started lookign into it- Thats when I found the cyls bad. It still seems to be getting worse. It loops pretty bad at stop lights. sometimes stalls.
Heat riser is on the pass side and it is stuck but stuck open.
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