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Need help finding a gremlin
#2110967
07/16/16 03:02 AM
07/16/16 03:02 AM
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Joined: Nov 2004
Posts: 3,518
pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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Ok I have been fighting an issue with what feels like the car is running out of fuel at wot, sounded sick running down track and popped once out of the exhaust
Verified 6 psi all the way down track
jetted up 2 sizes from 84 Sq to 86 Sq (car ran best et @84)
timing at 34*
had the heads re done springs checked good
all filters clear, psi on pump verified with visual into a tank
I am down 3 MPH in the 8th and 2 in the quarter
thinking it has to be in the distr. or box or coil
running msd distr, firecore wires, msd coil and a msd 6Al box grounded to the batt. alter is showing 14 volts
best today was a 10.447 @128.98, 1/4 6.642 @ 103.25 1/8th
best ET is in sig
Help me find the gremlin
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
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Re: Need help fiding a gremlin
[Re: rebel]
#2110977
07/16/16 03:35 AM
07/16/16 03:35 AM
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Joined: Nov 2004
Posts: 3,518
pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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strip the carb, blow out all the air bleeds & fuel holes, reassemble & try again. done that, did the same thing with a different carb too
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
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Re: Need help fiding a gremlin
[Re: Stroker Scamp]
#2111012
07/16/16 09:28 AM
07/16/16 09:28 AM
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Joined: Jan 2005
Posts: 2,540
Milwaukee WI
TRENDZ
master
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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A pop out of the exhaust would tell me fuel is in the pipes. Look at the ignition system.
"use it 'till it breaks, replace as needed"
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Re: Need help fiding a gremlin
[Re: Stroker Scamp]
#2111033
07/16/16 10:38 AM
07/16/16 10:38 AM
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Joined: Aug 2010
Posts: 632
Casco, MI
Savoy1964
mopar
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mopar
Joined: Aug 2010
Posts: 632
Casco, MI
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If the carb has high speed air bleeds they might be too small? Had similar problem adjusted air bleeds and fixed the problem on the dominator.
2003 Dodge 3500 Diesel
1964 Plymouth Savoy White 2dr sdn. 512 stroked, Dominator, New Best 9.75 @ 138.50mph
2019 Challenger Scat Pack 1320 White Knuckle-K&N Cold air filter, Billit Oil catch can, drag radials stock 11.911 @ 114mph
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Re: Need help fiding a gremlin
[Re: Stroker Scamp]
#2111050
07/16/16 11:27 AM
07/16/16 11:27 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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See if a buddy has a MSD box you can try... I had a high end miss that you could barely hear and I did a A-B-A test with the box.. it was a box issue.. sent it in to MSD for a rebuild.. they said it was fine.. when I got it back it worked great... but I know the box was the cause(A-B-A) test proved that then try another coil 
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Re: Need help fiding a gremlin
[Re: tboomer]
#2111083
07/16/16 12:06 PM
07/16/16 12:06 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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[quote=fbs63]If it has a RPM chip in it, run it without it. If the problem goes away the chip is bad. [/quote
This is worth a try. I had it happen to my 64. Yep.. worth a try.. its simple... I've had a few that would change.. they would start dropping out a good 500 rpms below what they were set for... just pull all the chips and try it
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Re: Need help fiding a gremlin
[Re: MR_P_BODY]
#2111098
07/16/16 12:29 PM
07/16/16 12:29 PM
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Joined: Jul 2004
Posts: 19,318
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,318
State of confusion
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THIS............Was testing a friends Torino at night before a race and same thing, popping way before the redline so I suggested removing the chip and problem gone..........Not to say this is your problem but start w/the simple ones first........
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Need help fiding a gremlin
[Re: 70dusterjohn]
#2111124
07/16/16 01:38 PM
07/16/16 01:38 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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if the chip dont do it what about subbing in a spare regular electronic dist/ECU for a test? it'd be a bit of doing but it'd cut right to the chase by getting the Might/Sputter & Die system out of there
live every 24 hour block of time like it's your last day on earth
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Re: Need help fiding a gremlin
[Re: RapidRobert]
#2111164
07/16/16 02:52 PM
07/16/16 02:52 PM
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Joined: Nov 2004
Posts: 3,518
pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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RPM chip has already been removed
have a line on another box and coil to try
Valve springs checked good
I will let you know what I find
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
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Re: Need help fiding a gremlin
[Re: Stroker Scamp]
#2111198
07/16/16 04:18 PM
07/16/16 04:18 PM
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crabman173
Unregistered
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crabman173
Unregistered
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Those kinds issues almost always ignition---MSD distributors use an odd metal for the reluctor--it does corrode fast--we spray new units with WD40 and blow off before install--check it first--I have seen them where you take cap off and it looks like a piece of iron that came from bottom of the sea--first thing I check when trouble comes--if you have real 12 volts to fuel pump it is usually not the issue--a "fill the can" test is best way to check fuel system --if carbs don't have trash they don't change all of a sudden--clean filters, can fill test, voltage test , check grounds but check MSD reluctor First--if that is good throw the coil in the ebay pile and get a new one
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Re: Need help fiding a gremlin
[Re: rickraw]
#2111423
07/16/16 10:56 PM
07/16/16 10:56 PM
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Joined: Nov 2004
Posts: 3,518
pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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Is the positive wired direct to the batt? My 6al die competely last summer(no spark). Before it die, the car just wasn't running right, Pos. is wired to the starter and has been that way since day one
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
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Re: Need help fiding a gremlin
[Re: ]
#2111424
07/16/16 10:58 PM
07/16/16 10:58 PM
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Joined: Nov 2004
Posts: 3,518
pacific northwest
Stroker Scamp
OP
master
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OP
master
Joined: Nov 2004
Posts: 3,518
pacific northwest
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Those kinds issues almost always ignition---MSD distributors use an odd metal for the reluctor--it does corrode fast--we spray new units with WD40 and blow off before install--check it first--I have seen them where you take cap off and it looks like a piece of iron that came from bottom of the sea--first thing I check when trouble comes--if you have real 12 volts to fuel pump it is usually not the issue--a "fill the can" test is best way to check fuel system --if carbs don't have trash they don't change all of a sudden--clean filters, can fill test, voltage test , check grounds but check MSD reluctor First--if that is good throw the coil in the ebay pile and get a new one I had the distr. out and all cleaned up it was pretty rusty
footbrake N/A SB 408 Scamp 10.10 @ 132 street/strip
73 Duster 340 street strip 12.79 @ 105
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