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nsargeant |
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#1
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Newbie ![]() Group: Members Posts: 12 Joined: 27-August 17 From: Vincennes, In Member No.: 21,381 Region Association: Upper MidWest ![]() |
In the quest for a perfect running 914 im getting oh so close. In the past I have replaced the tps with a new one that fixed the severe bucking/hesitation. The car ran so much better after that. What I am trying to figure out now is a random hesitation/hiccup that happens mostly during steady throttle when I am cruising on a highway. If I drive 30 miles it might happen once or twice. It seems pretty minor compared to the bucking I was having with the old tps. If I recall it has had this hesitation since I have owned the car for the last 3 years. I know the distributor does have a pertronix module in it. Ive recently changed replaced a few things listed below but still have that little hiccup. What would you guys investigate next?
Replaced: Fuel pump/filter Installed SS lines plugs, wires, rotor, (cap still looked new) tps sensor |
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nsargeant |
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#2
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Newbie ![]() Group: Members Posts: 12 Joined: 27-August 17 From: Vincennes, In Member No.: 21,381 Region Association: Upper MidWest ![]() |
[quote name='dr914@autoatlanta.com' date='Mar 16 2020, 09:42 AM' post='2794711']
maybe a less than tight ground lead on the back of the block I would assume I get access to this from the bottom side? What side is it located on? I will also check the vacuum on the mps when I get my hands on a tester thanks, Nathan |
BeatNavy |
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#3
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Certified Professional Scapegoat ![]() ![]() ![]() ![]() Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region ![]() ![]() |
maybe a less than tight ground lead on the back of the block I would assume I get access to this from the bottom side? What side is it located on? I will also check the vacuum on the mps when I get my hands on a tester There is a multi-spade (3 connectors) ground that's on the top middle part of the case toward the back. It's underneath the plenum, and it held on by a case bolt. You should make sure those are clean and the 3 FI connectors connect tightly to them. You're going to need to remove the air cleaner. I think you can access it without removing the plenum (it's underneath and behind it). |
nsargeant |
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#4
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Newbie ![]() Group: Members Posts: 12 Joined: 27-August 17 From: Vincennes, In Member No.: 21,381 Region Association: Upper MidWest ![]() |
maybe a less than tight ground lead on the back of the block I would assume I get access to this from the bottom side? What side is it located on? I will also check the vacuum on the mps when I get my hands on a tester There is a multi-spade (3 connectors) ground that's on the top middle part of the case toward the back. It's underneath the plenum, and it held on by a case bolt. You should make sure those are clean and the 3 FI connectors connect tightly to them. You're going to need to remove the air cleaner. I think you can access it without removing the plenum (it's underneath and behind it). Looked at that yesterday evening and all seemed decent. Connections were a little dirty (greasy) but tight. They had been spliced into with new wires but appeared to be done right with solder and shrink tube. I will clean them up and then vacuum test the mps. thought I would give you guys an update. thanks for all of your help nathan |
ctc911ctc |
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#5
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Senior Member ![]() ![]() ![]() Group: Members Posts: 893 Joined: 9-June 18 From: boston Member No.: 22,206 Region Association: North East States ![]() ![]() |
Spliced and Done Right? (IMG:style_emoticons/default/shades.gif)
There is a reason that these wires were repaired. I cannot think of anything that would have me repairing that part of the wiring unless something very weird happened. Perhaps others here might have an idea? The shrink tube could be hiding cold solder. Spend the time to take a look - ground loops are maddening and very difficult to identify. Mentally I have done the following to your car: 1. Take off the Connector at the ECU(commonly referred to as 'the computer') 2. referenced the wiring schematic and buzz out each of the ground wires as well as the control wires in the engine control harness 3. Shake the cable while the buzzer is buzzing, check for openings I am not sure why there are so many ground wires that return to the ECU, but Bosch had a reason for everything. Sorry to re-point you in this direction - very important to start with Solid Ground to build on. (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/smile.gif) maybe a less than tight ground lead on the back of the block I would assume I get access to this from the bottom side? What side is it located on? I will also check the vacuum on the mps when I get my hands on a tester There is a multi-spade (3 connectors) ground that's on the top middle part of the case toward the back. It's underneath the plenum, and it held on by a case bolt. You should make sure those are clean and the 3 FI connectors connect tightly to them. You're going to need to remove the air cleaner. I think you can access it without removing the plenum (it's underneath and behind it). Looked at that yesterday evening and all seemed decent. Connections were a little dirty (greasy) but tight. They had been spliced into with new wires but appeared to be done right with solder and shrink tube. I will clean them up and then vacuum test the mps. thought I would give you guys an update. thanks for all of your help nathan |
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