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Author
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Topic: rpms "stuck"?
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66_stang
Journeyman Posts: 97
From: The woodlands Texas
Registered: Jul 2004
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posted 03-15-2005 09:32 PM
   
Well i suppose "stuck" is the best word i can think for it. Anyways, at first i thought it was just normal but now i think it might be a problem. Whenever driving my stang, i can NOT get it above 3k rpm. I can flooor it at any mph or gear and it'll go up to about 2800ish. I took her onto the highway and i floored it all the way up to 80mph and i think it barely touched 3k rpm. Now with my car being a 302, i know alot of the power is made up top so wtf is going on? I have a stock C4 and rear-end so maybe its the gears? Im not sure, gimmie your opinions ya'll.
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65ponycar
Gearhead Posts: 748
From: Dayton, OH
Registered: Jul 2003
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posted 03-15-2005 10:46 PM
Have you checked to make sure your throttle linkage is adjusted properly, i.e. allowing your throttle plates to open fully?
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whiteknight289
Gearhead Posts: 1273
From: Wheaton, IL, USA
Registered: Mar 2004
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posted 03-15-2005 11:15 PM
What kind of tachometer are you using?
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Toronado3800
Gearhead Posts: 832
From: St. Louis, MO
Registered: Jul 2001
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posted 03-16-2005 12:27 AM
I had an EGR valve get stuck once on a Performer intake and it kept my car from revving well. The problem wasn't apparent at low speeds and I don't remember the spark plugs fouling at all. I solved that problem by swapping in a non-egr intake.Another time I had an intake manifold leak which fouled all the plugs on one bank. That was pretty noticeable across the whole RPM range though and was plum obvious when I pulled the plugs.
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N266fords
Gearhead Posts: 1380
From: Spokane ,WA USA
Registered: Apr 2003
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posted 03-16-2005 02:15 AM
dont rule out the coil
I had one fail just like you descriped it would idle fine take off like a raped ape then fall on its face at 3k I could ease the rpms to 6500 with no problem in any gear but if i stuffed my foot into it nothing above 3k it would load up..
Bruce
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hardhat
Journeyman Posts: 47
From: summerland, ca
Registered: Feb 2004
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posted 03-16-2005 02:52 AM
What about vaccum leaks?
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indyphil
Gearhead Posts: 2354
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 03-16-2005 07:33 AM
Could be ignition related like N266 said. Do you still have points? I dont think its the gears, my 289 has stock C4 and stock rear gears and it revs to 4500 easily.Does it kickdown for you? Can you force it to stay in 1st with your shifter and mash it? what happens then?
We probably need to know how your ignition and fuel supply is set up to really help. ------------------
'68 coupe, '66 289 C code
engine, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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289u4ea
Journeyman Posts: 51
From: Pleasanton, CA
Registered: May 2000
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posted 03-16-2005 02:22 PM
Your problem sounds famliar. Check for a clogged fuel filter also. It can restrict the total fuel to the carb. ------------------
'65 FB 289
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64coupe
Journeyman Posts: 85
From: Langhorne, Pennsylvania, United States of America
Registered: Sep 2002
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posted 03-16-2005 03:44 PM
quote:
Originally posted by indyphil:
Could be ignition related like N266 said. Do you still have points? I dont think its the gears, my 289 has stock C4 and stock rear gears and it revs to 4500 easily.Does it kickdown for you? Can you force it to stay in 1st with your shifter and mash it? what happens then?
We probably need to know how your ignition and fuel supply is set up to really help.
i would check the points if you are still using a point setup.
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mustangs68
Moderator Posts: 22182
From: Buckroe Beach Va MCA#39406 M&M #12 Member Mustang Club of Tidewater
Registered: May 99
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posted 03-16-2005 05:14 PM
well..
Are the connection snug and clean for the tach..no one asked so..  sam
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66_stang
Journeyman Posts: 97
From: The woodlands Texas
Registered: Jul 2004
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posted 03-16-2005 06:45 PM
I have a sunpro tac, and i think its working just find. Reads the idle rpm perfectly etc. As far as a clogged fuel line or anything like that i highly doubt my mechanic would overlook that. How can i check the throttle linkage? and i have a petronix ignition. Im not sure if thats still the "points ignition" or not.
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68mustang351w
Gearhead Posts: 147
From: San Diego
Registered: Sep 2004
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posted 03-16-2005 07:28 PM
take the air cleaner off, pull linkage while looking into carb and see if the bottom "butterflies" open all the way(might have to open choke to see it). When your car is warm and in neutral, try revving it past 3k, and get back to us with what happens. Check filters, mechanics are human just like the rest of us... David F.
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64coupe
Journeyman Posts: 85
From: Langhorne, Pennsylvania, United States of America
Registered: Sep 2002
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posted 03-16-2005 09:22 PM
quote:
Originally posted by 66_stang:
I have a sunpro tac, and i think its working just find. Reads the idle rpm perfectly etc. As far as a clogged fuel line or anything like that i highly doubt my mechanic would overlook that. How can i check the throttle linkage? and i have a petronix ignition. Im not sure if thats still the "points ignition" or not.
that might be emliminated no points with a pertronix, but i wouldn't count it out. i know they do two things "work" or "don't work". i don't know about intermitant like cutting out in the rpm range???
the engine will rev past 3,000 rpm with the front of the carb and not the secondaries. check to make sure they are opening.
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74merc
Gearhead Posts: 956
From: Demopolis AL
Registered: Jun 99
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posted 03-17-2005 12:50 AM
quote:
Originally posted by 68mustang351w:
take the air cleaner off, pull linkage while looking into carb and see if the bottom "butterflies" open all the way(might have to open choke to see it). When your car is warm and in neutral, try revving it past 3k, and get back to us with what happens. Check filters, mechanics are human just like the rest of us... David F.
Could be like my cousin's Fairlane. When we did as you described, the carb opened all the way up. One of us decided to floor the pedal while the other watched from outside. The linkage needed adjusting.
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indyphil
Gearhead Posts: 2354
From: Senoia, G.A. USA
Registered: Jul 2002
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posted 03-17-2005 09:09 AM
Pertronix system dont have points just a magnetic trigger. However the reliability of pertronix systems has been bad with me on my car (others have had no problems). Id probably want to try a different ignition (like switch back to a well adjusted set of points) just to try it and see what happens.What happens if you're in neutral? will it rev up then? ------------------
'68 coupe, '66 289 C code
engine, edel 600cfm carb, performer intake, dual exhaust http://www.geocities.com/ottouk_77/68mustang.htm
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