 Cursed Bucking!, Fuel injection issue |
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| Gcotton92203 |
 Mar 11 2015, 03:46 PM
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#1
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Newbie  Group: Members Posts: 21 Joined: 14-February 14 From: Bermuda Dunes Ca. Member No.: 17,000 Region Association: Southern California  |
Hey, here's a stupid question. Anyone know where I can get a "GOOD" 1973 2.0 throttle positioner. I've developed that cursed bucking just off idle during slow acceleration but the rest of the power band is fine. I've cleaned up the circuit board as best I can and a new board may fix my problem but I'm not sure the contacts are all that great either so I'd just as soon replace the whole relay. Yeah, yeah, I know. put a carb on it. Just trying to stay as original as possible.
Gary 760 702-7251 gary@musicmagic.biz |
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| dknechtly |
Mar 13 2015, 01:50 PM
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#2
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Yellow 914 Group: Members Posts: 71 Joined: 11-April 03 From: Wylie, TX Member No.: 560 Region Association: None |
Hope you keep that FI in it. There are so many things to check. Do you have points? As they get closer is will run bad especially when first starting up. Also, check the resistance of the FI points. It should be as low as possible. Don't use emory cloth! Just a piece of note card or a jeweler's cloth. If it runs too lean, all kind of wierd things happen. Check that the mechanical advance is all nice and limber and no springs are broken.
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| Gcotton92203 |
Mar 13 2015, 02:18 PM
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#3
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Newbie Group: Members Posts: 21 Joined: 14-February 14 From: Bermuda Dunes Ca. Member No.: 17,000 Region Association: Southern California |
QUOTE(dknechtly @ Mar 13 2015, 12:50 PM)  Hope you keep that FI in it. There are so many things to check. Do you have points? As they get closer is will run bad especially when first starting up. Also, check the resistance of the FI points. It should be as low as possible. Don't use emory cloth! Just a piece of note card or a jeweler's cloth. If it runs too lean, all kind of wierd things happen. Check that the mechanical advance is all nice and limber and no springs are broken. Wow! lots of good info. I just converted to a Pertronix but it still did the same bucking just off idle. I'm pretty sure it's a worn circuit board. I just hoped I could find a new complete replacement but I guess people in Hell want ice water too. I also believe I'll be facing the vapor lock issue as I sometimes hear gurgling in the gas tank when starting warm after several minutes rest. Other than that I have no other issues with the way it runs and intend to keep it injected as long as humanly possible |
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| marksteinhilber |
Mar 13 2015, 02:53 PM
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#4
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Member Group: Members Posts: 229 Joined: 18-October 12 From: Foothill Ranch, CA 92610 Member No.: 15,057 Region Association: Southern California |
QUOTE(Gcotton92203 @ Mar 13 2015, 01:18 PM) QUOTE(dknechtly @ Mar 13 2015, 12:50 PM) Hope you keep that FI in it. There are so many things to check. Do you have points? As they get closer is will run bad especially when first starting up. Also, check the resistance of the FI points. It should be as low as possible. Don't use emory cloth! Just a piece of note card or a jeweler's cloth. If it runs too lean, all kind of wierd things happen. Check that the mechanical advance is all nice and limber and no springs are broken. Wow! lots of good info. I just converted to a Pertronix but it still did the same bucking just off idle. I'm pretty sure it's a worn circuit board. I just hoped I could find a new complete replacement but I guess people in Hell want ice water too. I also believe I'll be facing the vapor lock issue as I sometimes hear gurgling in the gas tank when starting warm after several minutes rest. Other than that I have no other issues with the way it runs and intend to keep it injected as long as humanly possible Try the suggested repair where you clean the contacts and /or move the finger to run on a new groove! |
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Posts in this topic
Gcotton92203 Cursed Bucking! Mar 11 2015, 03:46 PM
monkeyboy Look up the number at Summit Racing. I am pretty s... Mar 11 2015, 04:35 PM 914_teener Check the alignment of the board "wipers... Mar 11 2015, 04:55 PM somd914 Take a look here:
http://www.914world.com/bbs2/in... Mar 11 2015, 04:56 PM
mepstein
Take a look here:
http://www.914world.com/bbs2/i... Mar 11 2015, 05:25 PM warrenoliver I got one from BDStone914 - good guy to deal with.... Mar 11 2015, 07:44 PM Philip W.
I got one from BDStone914 - good guy to deal with... Mar 13 2015, 10:41 PM JawjaPorsche http://shop.914rubber.com/Porsche-914-Thro...ly-91... Mar 11 2015, 07:51 PM davesprinkle I've got repair kits for the 2.0liter cars and... Mar 11 2015, 08:18 PM Gcotton92203 I ordered the board today from 914 rubber. It... Mar 11 2015, 08:45 PM 914_teener
I ordered the board today from 914 rubber. It... Mar 11 2015, 10:13 PM Amphicar770 Circuit board from 914 rubber had my 914 purring l... Mar 13 2015, 05:48 PM The Cabinetmaker Gently clean up the board with some 2000 grit wet/... Mar 13 2015, 05:56 PM Gcotton92203 Replaced the circuit board. Seems better but still... Mar 27 2015, 10:50 AM PancakePorsche Identical to my car a year ago. A NOS TPS did not ... Mar 28 2015, 12:17 AM Bleyseng
Identical to my car a year ago. A NOS TPS did not... Mar 28 2015, 08:59 AM The Cabinetmaker Tps does not typically cause bucking at off idle, ... Mar 28 2015, 08:30 AM larss The wiper contact points also wear out:
TPS contac... Mar 28 2015, 09:06 AM Gcotton92203 A stroke of luck last night. I was fortunate enoug... Mar 28 2015, 09:35 AM boxsterfan
A stroke of luck last night. I was fortunate enou... Mar 28 2015, 02:38 PM BeatNavy
I think Tangerine sells MPS rebuild kits.
They d... Mar 28 2015, 02:42 PM |
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