 Intermittent rough running... what should I be looking for? |
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| Cuda911 |
 Apr 18 2016, 12:04 AM
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#1
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Senior Member  Group: Members Posts: 1,489 Joined: 20-May 14 From: Oceanside (N. San Diego County), CA Member No.: 17,376 Region Association: Southern California  |
Spent all day driving down the coast. Stopped a bunch of places. All day long, the car ran perfectly.
Then stopped for a couple hours for dinner. When I started it up, it ran fine, but then stalled out at the first traffic light when I let up on the gas. This happened a few more times. When running, it would buck like a bronco. Heel-toed it at every light to keep it from stalling. Got on the freeway, and it was still bucking. But, after about 5 or 10 miles, everything went back to running fine. So, what's up with that? What should I be looking for to prevent this in the future? '74, 1.8, FI. Thanks! Attached thumbnail(s) 
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| JeffBowlsby |
Apr 18 2016, 07:40 AM
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#2
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914 Wiring Harnesses Group: Members Posts: 8,510 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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Oil the advance weights lately? 1 drop 30 wt in the center of dizzy shaft every year.
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| dangrouche |
Apr 18 2016, 07:45 AM
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#3
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dangrouche Group: Members Posts: 550 Joined: 1-May 04 From: San Francisco Bay Area Member No.: 2,012 Region Association: None |
Heat soak on fuel pump? . Is pump in factory location? Dirty fuel tank? I had a 911 that drove well but once the dirt stacked up on the fuel fiter it sputtered. Shut it off. Then restarted and ran well.
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| boxsterfan |
Apr 18 2016, 09:05 AM
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#4
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914's are kewl Group: Members Posts: 1,776 Joined: 6-June 03 From: San Ramon, CA Member No.: 791 Region Association: Northern California |
Shorting of the seatbelt interlock relay under the passenger seat?
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| AZ914 |
Apr 18 2016, 12:44 PM
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#5
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914 Dumbass Group: Members Posts: 1,459 Joined: 6-January 03 From: Sunny Tucson Member No.: 98 Region Association: Southwest Region |
I had the 'stop-light-stall' problem back when I was still running with points... just a thought.
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| jor |
Apr 18 2016, 03:13 PM
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#6
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Just happy to be here. Group: Members Posts: 183 Joined: 28-July 14 From: LA Member No.: 17,693 Region Association: Southern California |
QUOTE(AZ914 @ Apr 18 2016, 11:44 AM)  I had the 'stop-light-stall' problem back when I was still running with points... just a thought. (IMG:style_emoticons/default/agree.gif) It sounds like points to me. |
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| Cuda911 |
Apr 18 2016, 03:45 PM
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#7
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Senior Member Group: Members Posts: 1,489 Joined: 20-May 14 From: Oceanside (N. San Diego County), CA Member No.: 17,376 Region Association: Southern California |
Thanks, all. The points is is were supposedly replaced when I bought the car, but I have since found that a number of items, for which there were paid invoices, were not actually done by the mechanic that billed for the work.
I did have the seat belt interlock bypassed, so that's a good place to check too. Fuel pump is in stock location. It has a pretty new fuel filter, but that's sure easy and cheap to replace. Nope, I have never oiled the dizzy shaft, so another cheap and simple thing I can try. Thanks, all! |
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| TheCabinetmaker |
Apr 18 2016, 05:53 PM
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#8
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Points will not go wonky then go back to normal. When the dwell degrades it stays that way till points are closed and will no longer run. A bad coil will cause those problems, as will a failing condenser.
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