 Cutting Out, Bad miss- Help Needed |
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| PDXBob |
 Oct 21 2024, 02:30 PM
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Newbie  Group: Members Posts: 44 Joined: 16-May 20 From: Portland Oregon Member No.: 24,272 Region Association: Pacific Northwest 
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Frustrated by a Bad Miss. hope the 914World Experts can help me out!
On my 1975 914 (1.8) I have had a sporadic bad miss for the last 6 to 8 months. Here are some of the details. - it’s been doing this for at least 6-8 months. Some days doesn’t miss at all. But today it was bucking so hard I didn’t know if I’d make it home. This was the worst it’s ever been! - When it misses it feels like it’s bucking, that is, doesn’t feel like one cylinder miss but total cut out. - it’s worse under a load, e.g. when going up a steep hill. - In the driveway today I could rev it up and hold it while standing still with no miss. Didn’t matter if I held it at 2,000, 3,000 revs- didn’t miss. - not sure if fuel or electric issue. Any tests I could do to determine? - Does it in all gears. - The Tac does NOT fluctuate when it cuts out. - The lights and radio do NOT flicker or stop. Any suggestions would be greatly appreciated. Thanks in Advance! PDXBob |
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| Fazasport |
Oct 22 2024, 04:46 AM
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#2
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Newbie Group: Members Posts: 5 Joined: 7-November 23 From: Tallahassee FL Member No.: 27,713 Region Association: South East States |
I am going to speculate that you may have a problem with the circuit board in you Throttle Position Sensor. I had the same symptoms with my '76 914 and that was the issue.
You can pull the wiring harness plug off of the TPS and drive the car. If it does not miss or buck that is your problem. A replacement circuit board is available to replace the one in your TPS. |
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| ClayPerrine |
Nov 5 2024, 06:34 AM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,918 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(Fazasport @ Oct 22 2024, 04:46 AM)  I am going to speculate that you may have a problem with the circuit board in you Throttle Position Sensor. I had the same symptoms with my '76 914 and that was the issue. You can pull the wiring harness plug off of the TPS and drive the car. If it does not miss or buck that is your problem. A replacement circuit board is available to replace the one in your TPS. This doesn't apply to a 1.8L. The 76 cars were all D-Jet. The 1.8L cars were L-Jet. One thing to check would be the dropping resistors mounted on the battery tray support next to the double relay. They are notorious for breaking wires inside, and that will cause one, or all cylinders to cut out. |
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Posts in this topic
PDXBob Cutting Out Oct 21 2024, 02:30 PM
rjames When was the last time you overhauled your distrib... Oct 21 2024, 03:44 PM
PDXBob
When was the last time you overhauled your distri... Oct 21 2024, 10:16 PM Olympic 914 I had a similar issue coming back from Okteenerfes... Oct 21 2024, 04:44 PM nivekdodge
I had a similar issue coming back from Okteenerfe... Nov 4 2024, 06:27 PM technicalninja :agree: :agree: :agree:
Especially if you don... Oct 21 2024, 05:18 PM worn Would it be correct to say that the motor runs smo... Oct 21 2024, 05:36 PM PDXBob
Would it be correct to say that the motor runs sm... Oct 21 2024, 10:10 PM PDXBob Thanks all. I’ll start working on various sugge... Oct 21 2024, 10:12 PM iankarr Cutting out like that can be caused by obstruction... Oct 22 2024, 01:21 AM PDXBob
Cutting out like that can be caused by obstructio... Oct 22 2024, 05:28 PM PDXBob
I am going to speculate that you may have a probl... Oct 22 2024, 05:31 PM emerygt350 Not sure if the 1.8 has the same TPS as a 2.0... ... Oct 22 2024, 05:48 PM Artfrombama My $.02
Engine missing under load. Classic s... Oct 25 2024, 10:35 AM 930cabman
My $.02
Engine missing under load. Classic ... Oct 25 2024, 02:07 PM nivekdodge Like Olympic 914, I had a miss I was chasing and c... Oct 26 2024, 09:19 AM PDXBob I’m going through and checking stuff to try and ... Nov 4 2024, 06:05 PM brant Don’t forget to adjust the valves. Set fuel pres... Nov 5 2024, 10:11 AM dr914@autoatlanta.com I would first replace the points condenser and set... Nov 5 2024, 10:25 AM PDXBob Thanks Clay and Dr914. Gives me A few more thing... Nov 5 2024, 02:42 PM PDXBob Ok, so I checked out my TPS and inspected and fixe... Nov 8 2024, 01:30 PM JeffBowlsby Our original engine bay harnesses are 50 years old... Nov 8 2024, 05:24 PM Osnabruck914 Every time I have had those symptoms, it was simpl... Nov 9 2024, 11:51 AM brant The fact that you had to repair a few connectors m... Nov 9 2024, 01:20 PM brant Duplicate post Nov 9 2024, 01:20 PM PDXBob I still have the cutting out (bucking) issue and h... Nov 27 2024, 08:05 PM |
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