cant figure this out_440 pops and lacks power ...
#972696
04/13/11 05:43 PM
04/13/11 05:43 PM
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Joined: Aug 2007
Posts: 134 Anchorage,AK
AK_JH27
OP
member
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OP
member
Joined: Aug 2007
Posts: 134
Anchorage,AK
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driving under normal conditions it runs fine, but when i mash the pedal the 440 starts to pop, it misses,lacks power, it acts like it hits a wall. i checked the timing, all the componets, plugs, wires, everyting, cant get this figured out. maybe a valve train problem? floating valves? sticking? can think of anything else. whats really fustrating is it starts fine, idles fine, it even revs up in park no problem.
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Re: cant figure this out_440 pops and lacks power ...
[Re: RapidRobert]
#972705
04/13/11 09:02 PM
04/13/11 09:02 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
Quote:
That car had contaminated fuel. Mixed in with the gas was a liquid that looked like Italian dressing. There were 2 quarts of it in there.
that may have been sugar
Heh heh heh. The car was always parked in my shop, aboyt 120 feet from my house. I don't know how anyone could have made it in there. My thoughts were that I must have used a "gas" can that had some leftover diesel in it from a truck tank that I drained.
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Re: cant figure this out_440 pops and lacks power ...
[Re: AK_JH27]
#972708
04/14/11 01:46 AM
04/14/11 01:46 AM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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I just remembered another incident...... I am not a drag racer by any means, but I built a big motor for the Charger anyway. 440 block, 4.15 stroke crank. 10.8 to 1 compression, Edelbrock heads, 850 carb, MP '509 cam, 2" TTI headers too. 727 with a 3000 stall converter and a 4.10 SG diff. Long ago I did an electronic ignition conversion. A local dragstrip had a car show & drag race event and I decided to race the car. I opened up the spark plug gap to .045 thinking the wider gap would make for a bigger spark. I put-putted to the venue to keep the wife from wigging out. So there I was, at the starting line. No burnout really, just a quick spin to clean the tires. The lights came down and I walked it out of the hole to avoid blowing off the tires. As I laid into the throttle, the motor started cutting out. At full throttle it was bucking, sputtering and hesitating. By the halfway mark I let up to about half throttle. I was shocked to see that I still turned a 14.83. At home I dug in to see what was to blame. Nothing was obvious at first look. I pulled the plugs and closed the gap to .035 and went for a drive. It ran better than at the track, but was still cutting out. I pulled the distributor cap and saw that the air gap from the reluctor to the pickup coil was W I D E ! Its supposed to be set to .008 inch. Mine was at .020, 2 1/2 times the recomended gap. I reset the gap and everything was back to normal!
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Re: cant figure this out_440 pops and lacks power ...
[Re: MoparforLife]
#972711
04/14/11 03:01 AM
04/14/11 03:01 AM
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Joined: Dec 2003
Posts: 2,042 Leucadia, Ca.
vdriver
top fuel
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top fuel
Joined: Dec 2003
Posts: 2,042
Leucadia, Ca.
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Quote:
Have you had the plugs out or had the wires off. Sounds an awful lot like you have number 5 & 7 plug wires switched around. At idle or very light load it will seem to run fine with a virtually unnoticeable miss being that the two cylinders are next to each other in the firing order, so wires being crossed puts the firing very close but not quite where it should be resulting in a miss under load much like you describe.
Years ago I ran a 440 in an old boat all summer like that. Drove me nuts; couldn't figure it out. Sure enough, had the wires crossed.
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Re: cant figure this out_440 pops and lacks power ...
[Re: vdriver]
#972712
04/14/11 05:36 AM
04/14/11 05:36 AM
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Joined: Jan 2003
Posts: 5,906 Athens, Greece
Pyper70
master
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master
Joined: Jan 2003
Posts: 5,906
Athens, Greece
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Remove a variable...Maybe a friend can let you borrow a carburetor that runs on their car and doesnt have problems...Once you have that squared away, move on to another variable. Do you have a fuel gauge maybe?
Apples to Oranges. My Dart used to do that when I first got it..but it was a 1bbl carb. moving up to a 2bbl improved but the 4bbl woke it up quite a bit.
What kinda carb you got on there? maybe a power valve is blown? You are leaking excess fuel into your manifold?
Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
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