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04-12-2008, 05:07 PM
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CC Member
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Join Date: Apr 2005
Location: Near Chattanooga,
TN
Cobra Make, Engine: SPF, 418 Stroker
Posts: 220
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Not Ranked
Engine Hesitation/Stutter/Miss
I have a weird problem. When backing off the throttle and when feathering to maintain a constant speed, there is occasionally a stutter that feels like a momentary loss of power. Sort of like the ignition system turned itself off for a split second. Everything is great when accelerating. I cannot duplicate this condition in the driveway. With no load on the engine, it backs off smoothly and runs smoothly at constant rpm. This problem just started last October and seems to be getting slowly worse. I've checked the timing and looked for vacuum leaks. Looking for ideas on things to check. 418W, MSD 6AL ignition, Holley 4150 HP. Many thanks.
Jerry
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04-12-2008, 05:27 PM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Not Ranked
Check the condition of the cap and rotor. It sounds like a hiccup in the MSD box, but there is no reason why it does not happen during acceleration.
Hook it up to a smog tester that analyzes the spark.
__________________
Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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04-13-2008, 04:59 AM
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CC Member
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Join Date: Jul 2005
Location: Virginia Beach, Va & Port Charlotte, Fl.,
Posts: 2,287
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Not Ranked
Read your plugs..
Get on a side road where you can shut it down and pull off the road at a moment's notice. Try and duplicate the problem and as soon as it starts shift to nuetral and shut the engine dowm immediately. Pull the plugs and check their condition. Wet? carboned up? Sooty? It could be a fuel problem and/or spark. That will give you a base line on where to go from there..
Dave
__________________
Too many toys?? never!
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04-13-2008, 10:45 AM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
Posts: 896
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Not Ranked
I had a similar problem on my 427 , dual quad Galaxie at very light loads and small throttle openings . Turned out that my air fuel ratio was off at cruise ( too lean ) and the issue cleared up when I richened it up a little . However , I may have an advantage on you as my carbs are highly modified and there isn`t one circuit that I can`t adjust.
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04-13-2008, 11:39 AM
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CC Member
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Join Date: Aug 2007
Location: Carlsbad,
Ca
Cobra Make, Engine: SPF 2932 with 438 Lykins Motorsports engine. Previous owner of FFR 5452.
Posts: 2,616
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Not Ranked
Bobcat is correct. Too lean at part throttle.
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04-13-2008, 03:40 PM
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CC Member
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Join Date: Apr 2005
Location: Near Chattanooga,
TN
Cobra Make, Engine: SPF, 418 Stroker
Posts: 220
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Not Ranked
Thanks to all for the suggestions. I'm going to check the distributer cap and rotor and then have it dynoed. Hopefully that will resolve any fuel mixture issues.
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04-15-2008, 05:20 PM
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CC Member
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Join Date: Apr 2005
Location: Near Chattanooga,
TN
Cobra Make, Engine: SPF, 418 Stroker
Posts: 220
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Not Ranked
FYI, the distributor cap contacts were in pretty bad shape, so I replaced it and the rotor. Problem fixed! Presumably it was happening during acceleration, but I didn't notice it then.
Thanks again for the input.
Jerry
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04-15-2008, 08:33 PM
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Beam Me Up Scottie
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Join Date: Aug 2004
Location: Squantum (part of Quincy),
MA
Cobra Make, Engine: SPF1049 Titanium w/black stripes, 351W with Trick Flow Heads, Tremec 3550
Posts: 7,592
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Not Ranked
What do I win for guessing the cause of your problem? Does the fact that the same thing happened to me 2 years ago decrease the award?   
Congrats on a smooth running Cobra!
__________________
Warren
'Liberals are maggots upon the life of this planet and need to get off at the next rotation.' (Jamo 2008)
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04-15-2008, 10:36 PM
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CC Member
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Join Date: Dec 2001
Location: San Diego,
CA
Cobra Make, Engine:
Posts: 2,979
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Not Ranked
Yep mine did the same thing. The center contact in the cap was worn flat.
__________________
Remember, It's never too early to start beefing up your obituary.
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04-16-2008, 08:08 PM
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CC Member
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Join Date: Apr 2005
Location: Near Chattanooga,
TN
Cobra Make, Engine: SPF, 418 Stroker
Posts: 220
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Not Ranked
Warren asked: What do I win for guessing the cause of your problem?
You get my sincere thanks and a gold star. And if I ever meet you, at least one beer.
Jerry
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