Porsche 914 1.8L FI flooding, Flooding |
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Porsche 914 1.8L FI flooding, Flooding |
Rod911964 |
Dec 16 2018, 07:10 PM
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#1
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Unregistered |
Greetings and HELP
Purchased a 1974 914, 1.8L FI. This Porsche has not been started in 24 years. So I have... Replace the tank Replace every fuel line Replace fuel pump Rebuilt injectors New Spark Plugs Replace all vacuum lines New Cap & points New spark plug wires checked for spark (got it) Check fuel pump function (OK) Checked for vacuum leaks (none found) Checked AFM (made lean, the changed back to orig. setting) So my problem. The engine starts for only a moment, say about NMT 10 seconds then dies out. Upon cranking the starter I am getting a lot of raw gas in the exhaust system, so much its spitting out the pipes. I collect about 3-4 ounces is a catch tray. Could I have the fuel tank lines reversed? So what am I doing wrong or what is wrong. Thanks in advance. |
Mark Henry |
Dec 16 2018, 07:57 PM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Flooding? Like you gave it too much gas and you can smell it? (IMG:style_emoticons/default/huh.gif)
I'd look for a hose leak, regulator leak, maybe injectors leaking? Head temp sensor? |
falcor75 |
Dec 17 2018, 12:10 AM
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#3
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Senior Member Group: Members Posts: 1,579 Joined: 22-November 12 From: Sweden Member No.: 15,176 Region Association: Scandinavia |
Stock or aftermarket fuel pump?, what is your fuel pressure set too?
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Rod911964 |
Dec 17 2018, 06:49 AM
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#4
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Unregistered |
Aftermarket pump (from Autoatlanata, "sanctioned as correct").
Have not yet installed a pressure gauge. This on the list of things to do. I have checked the seals to all 4 injectors and appear to be installed and sealing ok. Nonetheless, something is not correct with fuel delivery. There is so much gas collected in the exhaust system, I know its just a matter of time when it will ignite if not corrected. How can I confirm I have the fuels lines (output and return) at the tank thru the newly install SS lines in the tunnel correct? Thanks! Rob |
jim_hoyland |
Dec 17 2018, 07:16 AM
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#5
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Get that VIN ? Group: Members Posts: 9,419 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
L=Jet ? If my L-Jet AFM is not connected to that 7-pin plug, the engine will run for about 5 seconds and then die too.
I would recommend testing the AFM, either directly, or by exchanging it out; then I would look at the connections at the seal relay. Lastly, test those smaller vac hoses, I have found they can become brittle and look good, but actually leak. Once a broken T in a hose line created an air leak. |
jim_hoyland |
Dec 17 2018, 07:26 AM
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#6
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Get that VIN ? Group: Members Posts: 9,419 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
Connector numbers on the AFM Plug: 27, 36, 6, 9, 8, 7, and 39
The resistance between the following pairs of AFM connectors: Between 6 and 9 =200 - 400 ohms Between 7 - 8 =120 - 200 ohms Between 6 - 27 =2K ohms at ambiant temp Between 36 - 39 =Infinate with flap closed; Zero with flap slightly open These are for a '75 L-Jet with a 7 pin connector; the '74 may be 6 pin |
ClayPerrine |
Dec 18 2018, 06:27 AM
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#7
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Life's been good to me so far..... Group: Admin Posts: 15,820 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
Also check the cylinder head temp sensor to insure it is hooked up. If it is disconnected, the engine will think it is -80 degrees and go full rich on the injectors.
BTDT. |
IronHillRestorations |
Dec 18 2018, 08:51 AM
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#8
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I. I. R. C. Group: Members Posts: 6,762 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
I don't know the 1.8 injection system very well, but I wondered if your injectors are gummed up and sticking open.
My own advice is to make a logical checklist and eliminate each possible problem area. |
Rod911964 |
Dec 18 2018, 12:35 PM
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#9
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Unregistered |
Thanks all,
So the next on the list is to... 1) 4 baby food jars and check the injector flow rates 2) Check (and replace) Cyl Head Temp Sensor 3) Adjust dwell at Distributor Report to follow. |
jim_hoyland |
Dec 18 2018, 01:15 PM
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#10
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Get that VIN ? Group: Members Posts: 9,419 Joined: 1-May 03 From: Sunset Beach, CA Member No.: 643 Region Association: Southern California |
If your '74 has a dual relay; check all the connections. If there is a base that blocks the view of the connectors, check each for tightness; especially the ones on the right side.
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Rod911964 |
Dec 23 2018, 06:08 PM
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#11
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Unregistered |
Update...
This will sound routine, however a good day in the garage with my 914. Replaced fuel pressure regulator Did injector flow test (see pic) Replaced CHT (this was the silver bullet) Now on to final tuning and putting up. Then onto the brakes. Thanks all! |
Rod911964 |
Dec 23 2018, 06:58 PM
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#12
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Unregistered |
Pic 1
Attached thumbnail(s) |
rhodyguy |
Dec 23 2018, 07:36 PM
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#13
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,188 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
The head temp was the culprit?
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Rod911964 |
Dec 23 2018, 08:04 PM
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#14
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Unregistered |
Yes, it appears to be the CHT.
I replaced the fuel pressure regulator today also. Nonetheless, when I started the 914 (after being in hibernation for 25 years) it started right up an settled down. No flooding :) |
IronHillRestorations |
Dec 24 2018, 07:22 AM
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#15
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I. I. R. C. Group: Members Posts: 6,762 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None |
Huzzah!
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