 Another 'bucking' question…. |
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| Larmo63 |
 Nov 13 2014, 07:30 PM
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Advanced Member  Group: Members Posts: 4,267 Joined: 3-March 14 From: San Clemente, Ca Member No.: 17,068 Region Association: Southern California  |
After the third set of old heat exchangers on my '73 1.7 FI, I finally buttoned up exhaust leaks and now the car has started bucking/hesitation. All new ignition parts, timing, TPS exchanged with a new one, no difference. No known vacuum leaks. I can drive the car and it has power, but I have to drive "around" the hesitations. Fuel pump was replaced too. I'd like it to run better while I finish the 2056 carb engine. Ideas? (IMG:style_emoticons/default/headbang.gif)
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| colingreene |
Nov 19 2014, 03:38 AM
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Senior Member Group: Members Posts: 734 Joined: 17-October 13 From: Southern California Member No.: 16,526 Region Association: Southern California |
quote name='dknechtly' date='Nov 17 2014, 06:43 AM' post='2111415']
Since it's on acceleration, check that your vacuum advance is working. Also check the mechanical advance moving nicely? All springs in place? Timing set right (@3500 with vac advance hoses unhooked and plugged)? Are the FI trigger points clean? Check the resistance; it should be very low. [/quote] distributor is a good thought since you did mention they went though it twice. Fuel pressure should help rule out some things. the MPS i gave you said it helped but did not solve it. Makes me think fuel. Kind of frustrating that trying to fix the cars leaks actually happened to make it worse. Its not a consistent buck, its only under certain load conditions and RPM. Im not sure its the TPS though. This is the huge problem i have with all the people that say keep the stock injection, its a huge pain to troubleshoot and often its a shot in the dark. Carb problems are usually straight forward. |
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Posts in this topic
Larmo63 Another 'bucking' question…. Nov 13 2014, 07:30 PM
krazykonrad My guess is the MPS diaphragm has worn out. That c... Nov 13 2014, 08:28 PM mepstein Check all grounds and electrical connections aroun... Nov 13 2014, 08:33 PM 914_teener
After the third set of old heat exchangers on my ... Nov 13 2014, 08:36 PM r_towle Describe the bucking in more detail....
Accel or ... Nov 13 2014, 09:09 PM Larmo63 Mostly during acceleration. It doesn't want to... Nov 14 2014, 09:38 AM rjames Check all fuel delivery items from the filter to t... Nov 14 2014, 11:12 AM Larmo63 We only worked on sealing up the intake system. Ne... Nov 14 2014, 06:31 PM
Jasfsmith
We only worked on sealing up the intake system. N... Nov 17 2014, 08:59 AM
Philip W.
We only worked on sealing up the intake system. N... Nov 19 2014, 07:04 AM Gcotton92203 I had that problem twice. I found a leak at the va... Nov 14 2014, 06:43 PM r_towle Sounds lean.
Check injector seals?
Not visible, bu... Nov 14 2014, 06:59 PM 57lincolnman
After the third set of old heat exchangers on my ... Nov 14 2014, 09:03 PM larss Did you change to a new TPS or only to a new TPS c... Nov 15 2014, 12:27 AM dknechtly Since it's on acceleration, check that your va... Nov 17 2014, 08:43 AM Philip W. my last TPS was a replacement board and brand new,... Nov 19 2014, 06:47 AM |
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