 Could this be vapor lock?, Engine wouldn't start, now its fine |
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| Yoei66 |
 Mar 8 2005, 08:57 PM
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#1
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My ride  Group: Members Posts: 168 Joined: 28-February 05 From: Portland, OR Member No.: 3,682  |
So, do 914’s get vapor lock? It was a 70+ degree day here in Portland, and I was out for an extended ride in the foothills SE of Portland. I stopped in a Supermarket parking lot for 5 minutes, and the engine was dead. (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif)
I has 1/4 tank of gas, good spark from coil & spark plug wire, battery & starter were turning strong. After waiting for 45 minutes with the engine lid open it still wouldn’t start. At this point my road service guy showed up. After a tow truck ride home, watching St. Helens blow on the way, It started right up as the tow truck drove away. Is this classic vapor lock? Runs great now. Do fuel injected systems fail when the engine bay warms up? (IMG:http://www.914world.com/bbs2/html/emoticons/blink.gif) |
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| TheCabinetmaker |
Mar 8 2005, 09:10 PM
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#2
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I drive my car everyday Group: Members Posts: 8,336 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Yes, 914s vaporlock, but not usually at 70 degrees. My 73 vapor locked on 90+ degree days till I moved the fuel pump to the front trunk. After that it never happened again. The original location of early cars had hot air dumped directly on it from the closed flapper valve. Next time it happens, pour some water on the fuel pump. If it starts, you have your answer. If not, the fuel pump or CHT could be at fault
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| Yoei66 |
Mar 8 2005, 09:21 PM
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#3
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My ride Group: Members Posts: 168 Joined: 28-February 05 From: Portland, OR Member No.: 3,682 |
Curt: I was about to inspect the fuel pump when my road service guy showed. The fuel pump on my ‘75 is located in the front trunk, which is why I thought I was immune to vapor lock. What is the CHT?
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| TheCabinetmaker |
Mar 8 2005, 09:27 PM
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I drive my car everyday Group: Members Posts: 8,336 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
Cylinder head temp sensor. Hmmm, I had the exact problem with my 75. It would just die for no reason. Turned out to be the air filter.
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| Yoei66 |
Mar 8 2005, 09:39 PM
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#5
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My ride Group: Members Posts: 168 Joined: 28-February 05 From: Portland, OR Member No.: 3,682 |
Hmmm, my air filter is a almost new NAPA paper filter. Do KN filters make a huge positive impact? perhaps if this happens again i'll pop the filter compartment open.
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| bondo |
Mar 8 2005, 09:51 PM
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#6
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Practicing my perpendicular parking Group: Members Posts: 4,277 Joined: 19-April 03 From: Los Osos, CA Member No.: 587 Region Association: Central California |
Could be a relay board problem. Mine was having fuel pump troubles and I traced it to the relay board. wiggling things would make the fuel pump work/not work.
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| drgchapman |
Mar 8 2005, 10:30 PM
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#7
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Current Stable Group: NoClassifiedAccess Posts: 922 Joined: 20-September 04 From: Portland, OR Member No.: 2,789 Region Association: Pacific Northwest |
It might be the planets or Mt. St. Helens, but I have had the same problem the last couple of days here in Portland as well. Ran a thread the last couple of days, consenses is the CHT. I'm out of town the next couple of weeks, so you will get a chance to try the advice before I do. Please PM me and let me know how it goes for you.
Gary |
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| gregrobbins |
Mar 8 2005, 11:13 PM
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#8
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Member: Team NARP Group: Members Posts: 1,515 Joined: 23-March 04 From: Arizona Member No.: 1,844 Region Association: Southwest Region |
Gary, three of us are having the problem right now. I just ordered an new CHT and will get it installed and let you know if that solves the issues. I also plan to give all the wiring a good look over/cleaning at the same time.
Travel safe. |
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| Yoei66 |
Mar 8 2005, 11:55 PM
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#9
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My ride Group: Members Posts: 168 Joined: 28-February 05 From: Portland, OR Member No.: 3,682 |
I'm going to check my fuel pump circuits, fuses, and relay to see if anything is loose.
Side note, I had a new car audio deck installed yesterday. I truly doubt this had anything to do with the engine not starting for 1.5 hours and then starting again like there never was an issue, but until I solve this problem, it is suspect as well. |
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