 75 1.8 L jet bucking |
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| Geezer914 |
 Jun 23 2019, 03:57 AM
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#1
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Geezer914  Group: Members Posts: 1,393 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States 
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Coming home from a friends house last night the car started bucking. Luckily I just made it home. (IMG:style_emoticons/default/WTF.gif) Where to start?
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| jim_hoyland |
Jun 23 2019, 06:48 AM
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#2
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Get that VIN ? Group: Members Posts: 9,271 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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Try looking at: http://www.914world.com/bbs2/index.php?sho...&hl=bucking
BTW-Found this thread by doing a search using +bucking, then selected titles only; a whole page of threads appear with "bucking" in the titles. Good luck with this one, keep us posted;If I'm the next one to experience bucking, I'll rely on your analysis..... (IMG:style_emoticons/default/smile.gif) |
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| Geezer914 |
Jun 23 2019, 09:16 AM
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#3
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Geezer914 Group: Members Posts: 1,393 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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Thanks for all the reply's. I'll do the search on bucking.
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| Porschef |
Jun 23 2019, 09:48 AM
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#4
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How you doin' Group: Members Posts: 2,165 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States
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Dual relay, then vacuum leak
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| rfinegan |
Jun 23 2019, 11:44 AM
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#5
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Senior Member Group: Members Posts: 973 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region
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when my 1.8 was bucking it was the connector at the AFM. I had a pin or 2 push out of the connector and intermittent contact. ez fix and problem solved for me...
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| jim_hoyland |
Jun 23 2019, 03:42 PM
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#6
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Get that VIN ? Group: Members Posts: 9,271 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California
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My 1.8 L-Jet never went through biking episodes; but if it did, the first thing I would check is the connector at the dual relay. The connector on the left side has 12v in, ground, starter, and fuel pump ( black/red). If that fuel pump connector is not making good contact, the fuel pump will go off/on.
I aventually connected those wires directly to the dual relay. |
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| mepstein |
Jun 23 2019, 03:53 PM
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#7
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914-6 GT in waiting Group: Members Posts: 19,255 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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My car bucked off and on for over 6 months. I did a bunch of things but I believe it was overhauling the distributor that fixed it.
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| ClayPerrine |
Jun 23 2019, 09:40 PM
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#8
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Life's been good to me so far..... Group: Admin Posts: 15,436 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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Check the ground contacts at the rear center of the motor. Broken or loose grounds can cause bucking.
Dropping resistors can cause this also. They have a tendency to break wires in them. With a 914, it's always the grounds. Except when it's not the grounds. |
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| Geezer914 |
Jun 24 2019, 11:45 AM
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#9
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Geezer914 Group: Members Posts: 1,393 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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Tested the coil it read 9380 ohms from the negative post to the center. My spare coil read 8500 ohms. I think the coil over heated. I swapped out the coil and replaced the plugs, cap, and rotor. It has a Petronics ignition module. It ran great, but I need to take an drive for an hour or so to let things get hot and see if the same symptoms develop. (IMG:style_emoticons/default/poke.gif)
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| Geezer914 |
Jun 29 2019, 04:27 PM
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#10
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Geezer914 Group: Members Posts: 1,393 Joined: 18-March 09 From: Salem, NJ Member No.: 10,179 Region Association: North East States
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Took a 45 minute drive and everything ran fine. Ordered a CHT from 914 Rubber to install for piece of mind.
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