 TPS testing question?, Car is bucking under load |
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| Jon H. |
 May 25 2016, 10:26 AM
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Member  Group: Members Posts: 237 Joined: 1-July 11 From: Ottawa, Canada Member No.: 13,264 Region Association: Canada  |
Hello, I had my 73 2.0l out for its maiden voyage this year and the car was running great. On the way home I stopped at a light and when I took off the car was bucking horribly. I investigated and found the bolt under the plenum that grounds the wires for the TPS and, I think, the injectors had come out. I re-installed it checked the grounds, checked continuity between the ecu and the TPS and all is good. I checked the continuity of the TPS as the throttle is opened and closed and it appears that there are about three position that are open circuit. They are small gaps though, barely having to move the throttle to get continuity again. It this normal? Should there be 'flat' spots as I move the throttle or should there be 100% continuity all the time? I did remove the TPS and have a look and it looks fine. Could an arcing ground have caused the TPS to fail?
Thanks in advance! Jon h. |
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| Jon H. |
May 25 2016, 03:13 PM
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Member Group: Members Posts: 237 Joined: 1-July 11 From: Ottawa, Canada Member No.: 13,264 Region Association: Canada |
I just checked for the TPS clicks again and now i hear them, about 13 or so (weird, they weren't there before) . I just removed the TPS plug and went for a drive, no difference, it still bucks. When i first started looking into this a few weeks ago I did notice that the distributer was oily inside so I removed it and pulled it apart to clean it but I didn't pull the trigger points out. I didn't want to mess with setting them up. I also didn't check to see if the advance plates were in working order. They looked fine, but what do i know. Im going to test the entire FI harness and make sure all is good.
Regards' Jon h. |
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| r_towle |
May 25 2016, 06:04 PM
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#3
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Custom Member Group: Members Posts: 24,585 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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QUOTE(Jon H. @ May 25 2016, 05:13 PM)  I just checked for the TPS clicks again and now i hear them, about 13 or so (weird, they weren't there before) . I just removed the TPS plug and went for a drive, no difference, it still bucks. When i first started looking into this a few weeks ago I did notice that the distributer was oily inside so I removed it and pulled it apart to clean it but I didn't pull the trigger points out. I didn't want to mess with setting them up. I also didn't check to see if the advance plates were in working order. They looked fine, but what do i know. Im going to test the entire FI harness and make sure all is good. Regards' Jon h. Have fun but most likely you will chase your tail for a while until you do a proper tune, clean the advance plates and re time the motor Ockams razor |
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Posts in this topic
Jon H. TPS testing question? May 25 2016, 10:26 AM
BeatNavy "Greater FI minds" than me will have mor... May 25 2016, 10:54 AM rmital ...check the connection from the harness to the CH... May 25 2016, 10:57 AM
Jon H.
...check the connection from the harness to the C... May 25 2016, 11:09 AM rmital
...check the connection from the harness to the ... May 25 2016, 11:40 AM Jon H. I checked the TPS using pins 9 and 12 on the ecu a... May 25 2016, 11:02 AM BeatNavy Ok, so 17 is the idle pin and you should get conti... May 25 2016, 11:12 AM Jon H.
Ok, so 17 is the idle pin and you should get cont... May 25 2016, 11:17 AM r_towle Dirty advance plates May 25 2016, 11:43 AM BeatNavy
Dirty advance plates
I should have seen that com... May 25 2016, 11:47 AM r_towle Weirdest behavior can be traced back to those pesk... May 25 2016, 11:52 AM BeatNavy
Weirdest behavior can be traced back to those pes... May 25 2016, 12:48 PM jor If the FI is checking out, and the bucking is only... May 25 2016, 12:28 PM rmital
If the FI is checking out, and the bucking is onl... May 25 2016, 12:33 PM Jon H.
If the FI is checking out, and the bucking is onl... May 25 2016, 03:04 PM BeatNavy I just checked mine in the garage (D-Jet, 2.0): 2... May 25 2016, 04:51 PM Jon H. Well, after double checking the wiring harness I d... May 25 2016, 06:46 PM PancakePorsche Wish I had a dollar for every time I have heard of... May 26 2016, 02:59 AM |
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