Misfire?? someone help???
06-14-2014, 09:46 PM
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Misfire?? someone help??? i changed spark plugs for some tr5 along with some msd wires cleaned the carb good fuel psi.
sometimes while driving it misfires badly lowers rpms i have to step on it so it can turn back to normal but now the problem is much worse :/
ran it at the track yesterday and it was terrible.
first run just 1/8 mile
60--1.948
330-5.378
1/8-8.081 at 89.89
second run full 1/4
60-1.957
330-5.405
1/8-8.185 at 88.39
1/4-12.653 at 109.32
car is a foxbody coupe with a ls1 comp cam 287hr ls7 lifters 706 heads with 2 inch valves victor jr mighty demon 650 1 7/8 longtubes th400 3k stall 4.30 gearsn on 28x10.5
sometimes while driving it misfires badly lowers rpms i have to step on it so it can turn back to normal but now the problem is much worse :/
ran it at the track yesterday and it was terrible.
first run just 1/8 mile
60--1.948
330-5.378
1/8-8.081 at 89.89
second run full 1/4
60-1.957
330-5.405
1/8-8.185 at 88.39
1/4-12.653 at 109.32
car is a foxbody coupe with a ls1 comp cam 287hr ls7 lifters 706 heads with 2 inch valves victor jr mighty demon 650 1 7/8 longtubes th400 3k stall 4.30 gearsn on 28x10.5
06-15-2014, 03:00 PM
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06-15-2014, 10:55 PM
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06-16-2014, 05:03 AM
#6
Having to step on it to clear it up makes it sound carb related. Sure you got the float levels right, no dirt or debris left in the carb, didn't pinch a gasket putting it back together, power valve gasket in place, no leaks anywhere? I take it no wideband?
06-16-2014, 01:31 PM
#7
So the issue started after the new plugs/wire/carb clean? Did it run well before the new parts amd cleaning?
If so I would suggest removing and re-installing the old stuff 1 piece at a time. EX:
Remove new plugs, INSPECT FOR DAMAGE AND PROPER GAP. Install old ones. Test to see if the issue is still there.
Remove MSD wires, inspect, install old wires. test
Look into a possible issue in the carb like pop'n'wood recommends.
Another member here, BCZEE, recently went thru the same adventure with a misifre after some routine engine work. After many hours, many parts replaced and much frustration it turned out to be that 1 of the new spark plugs was cracked. Simple, stupid, and overlooked.
Start with the easy/cheap (most likely) stuff and work up to the major (less likely) possible issues
If so I would suggest removing and re-installing the old stuff 1 piece at a time. EX:
Remove new plugs, INSPECT FOR DAMAGE AND PROPER GAP. Install old ones. Test to see if the issue is still there.
Remove MSD wires, inspect, install old wires. test
Look into a possible issue in the carb like pop'n'wood recommends.
Another member here, BCZEE, recently went thru the same adventure with a misifre after some routine engine work. After many hours, many parts replaced and much frustration it turned out to be that 1 of the new spark plugs was cracked. Simple, stupid, and overlooked.
Start with the easy/cheap (most likely) stuff and work up to the major (less likely) possible issues
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06-17-2014, 01:47 PM
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So the issue started after the new plugs/wire/carb clean? Did it run well before the new parts amd cleaning?
If so I would suggest removing and re-installing the old stuff 1 piece at a time. EX:
Remove new plugs, INSPECT FOR DAMAGE AND PROPER GAP. Install old ones. Test to see if the issue is still there.
Remove MSD wires, inspect, install old wires. test
Look into a possible issue in the carb like pop'n'wood recommends.
Another member here, BCZEE, recently went thru the same adventure with a misifre after some routine engine work. After many hours, many parts replaced and much frustration it turned out to be that 1 of the new spark plugs was cracked. Simple, stupid, and overlooked.
Start with the easy/cheap (most likely) stuff and work up to the major (less likely) possible issues
If so I would suggest removing and re-installing the old stuff 1 piece at a time. EX:
Remove new plugs, INSPECT FOR DAMAGE AND PROPER GAP. Install old ones. Test to see if the issue is still there.
Remove MSD wires, inspect, install old wires. test
Look into a possible issue in the carb like pop'n'wood recommends.
Another member here, BCZEE, recently went thru the same adventure with a misifre after some routine engine work. After many hours, many parts replaced and much frustration it turned out to be that 1 of the new spark plugs was cracked. Simple, stupid, and overlooked.
Start with the easy/cheap (most likely) stuff and work up to the major (less likely) possible issues
problem solved carburetor was bad time to buy a new one.
would a 800 holley dp work on my set up?
what 1/4 mile number do you think my set up is capable?