Needs some help - 71 stock 914, starts and runs great for 30 minutes - then fails... |
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Needs some help - 71 stock 914, starts and runs great for 30 minutes - then fails... |
potomacmidget |
Aug 25 2018, 02:45 PM
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#1
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I gotta have more cowbell.... Group: Members Posts: 161 Joined: 27-March 11 From: Maryland Member No.: 12,860 Region Association: North East States |
Dear All,
I have a 1971, 1.7L 914, D-jet, original/stock with exception of the muffler system. Purchased from a fellow board member here, very well sorted car - has been solid for like 5 years. As of a month ago it starts fine, then after 30 minutes runs rough, backfires and then stalls. Has happened twice, managed to get home by keeping the engine rev'd at 2K RPM and then popping it in gear and keeping it in 3rd reving high, with backfires. Once it stalls very difficult to get it to start again. Both times it has been hot out, have not experienced this before, fuel pump is in the original position and perhaps vapor lock? (but never happened in the past). Prior to the issues I pulled distributor, replaced the points, condenser, cap rotor, and reinstalled. I exercised caution pulling it an ensured I lined it up properly. I "did" adjust the timing post distributor installation (had to find the faded spots and repaint them) and I adjusted the throttle at the screw by the throttle body. System idled great at like 750 RPM and ran fine - but then the stalling problem previously described started. I am thinking of the following could be issues: ignition parts? new but a bad component maybe? timing messed up? but not sure how it would drift as it starts fine fuel pressure regulator issue? CHT issue? bad coil? acts up once hot? bad fuel? bad relay board or D-jet pressure sensor? bad fuel filter? Any help appreciated. After the first failure I found I had a leaking fuel injector, leaking from the injector itself(crack). I replaced the injector and it fired up fine, but then 30 minutes later it sort of goes demonic on me...so that was not the root cause. Thanks in advance, Reg |
Dave_Darling |
Aug 25 2018, 11:27 PM
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#2
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914 Idiot Group: Members Posts: 15,048 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Next time it tries to die, try removing the gas cap. If it sucks a bunch of air in and the car runs OK again, your evaporative emissions system is plugged up.
--DD |
potomacmidget |
Aug 26 2018, 05:18 PM
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#3
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I gotta have more cowbell.... Group: Members Posts: 161 Joined: 27-March 11 From: Maryland Member No.: 12,860 Region Association: North East States |
Next time it tries to die, try removing the gas cap. If it sucks a bunch of air in and the car runs OK again, your evaporative emissions system is plugged up. --DD Mark and Dave - thanks for the advice, I do question the fuel I got, and do have an intact (rebuilt) emissions tubing/charcoal canister, so that could be the issue. thanks again. Reg |
Ansbacher |
Aug 26 2018, 05:55 PM
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#4
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Senior Member Group: Members Posts: 689 Joined: 4-July 14 From: Tampa Bay, Florida Member No.: 17,589 |
Been there- Coil, Coil, Coil!
Ansbacher |
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