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cal914 |
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#1
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Member ![]() ![]() Group: Members Posts: 319 Joined: 12-April 12 From: United Kingdom Member No.: 14,366 Region Association: None ![]() |
Hi there
Just put our 1970 914 back to fuel injection from carbs and it purred for the first 30 minutes in slow moving traffic but then it began to cough and then was quickly nearly kangarooing down the street. It was fine idling but trying to pull away and driving it, it sounded as though it was misfiring or coughing or not running on all cylinders. What's the checklist for trying to solve the problem? Thanks! |
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jcd914 |
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#2
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Advanced Member ![]() ![]() ![]() ![]() Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California ![]() |
I would start with fuel pressure.
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zipedadoo |
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#3
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Member ![]() ![]() Group: Members Posts: 135 Joined: 23-January 14 From: Arizona Member No.: 16,921 Region Association: None ![]() |
Check the throttle position sensor. Adjust, clean or rebuild.
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Dave_Darling |
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#4
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914 Idiot ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 14,991 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California ![]() ![]() |
Ignition. Always start with ignition. Also make sure the basic engine is in good shape, valves adjusted and decent compression, etc.
--DD |
Jeffs9146 |
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#5
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Ski Bum ![]() ![]() ![]() ![]() Group: Members Posts: 4,062 Joined: 10-January 03 From: Discovery Bay, Ca Member No.: 128 ![]() |
If it starts and runs fine when it is cold then starts sputtering check the CHT sensor.
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mgphoto |
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#6
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"If there is a mistake it will find me" ![]() ![]() ![]() Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California ![]() |
Where there any mods to the engine, cam, displacement?
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cal914 |
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#7
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Member ![]() ![]() Group: Members Posts: 319 Joined: 12-April 12 From: United Kingdom Member No.: 14,366 Region Association: None ![]() |
Took the car out again today,fine for the first 20mins then the problem returned.The engine has had no mods done to it and prior to fitting the Fuel Injection the car was running great
Thanks for any help that you can give |
Frankvw |
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#8
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working on my first 914 ! ![]() ![]() ![]() Group: Members Posts: 652 Joined: 13-April 16 From: Holland, the Netherlands Member No.: 19,896 Region Association: Europe ![]() |
Did you change the fuelpump from the low pressure carb pump back to a higher pressure FI fuel pump again ?
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boxsterfan |
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#9
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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 ![]() |
Sounds like CHT sensor.
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Rand |
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#10
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Cross Member ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None ![]() |
If it had a carb pump, would it run great for 20 minutes?
Have you checked the CHT as suggested yet? |
mepstein |
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#11
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914-6 GT in waiting ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 19,323 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region ![]() ![]() |
Mine used to do that -intermitted bucking. I almost parted the car. I tried a bunch of things but I think it was just bad electrical connections.
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cal914 |
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#12
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Member ![]() ![]() Group: Members Posts: 319 Joined: 12-April 12 From: United Kingdom Member No.: 14,366 Region Association: None ![]() |
Are the CHT sensor still available to buy new
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cal914 |
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#13
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Member ![]() ![]() Group: Members Posts: 319 Joined: 12-April 12 From: United Kingdom Member No.: 14,366 Region Association: None ![]() |
Just found out The CHT censor was brand new out of a packet , that's one thing eliminated
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mepstein |
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#14
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914-6 GT in waiting ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 19,323 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region ![]() ![]() |
I can't be sure but I think it was the wires around the tach and making sure the timing was correct that eliminated the bucking. I pulled off all the ground wires and cleaned them as well as the wires for the coil, ect.
I had done the chts but it didn't fix it. |
mgphoto |
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#15
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"If there is a mistake it will find me" ![]() ![]() ![]() Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California ![]() |
Are all the FI parts original and proper according to the rennlist site?
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cal914 |
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#16
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Member ![]() ![]() Group: Members Posts: 319 Joined: 12-April 12 From: United Kingdom Member No.: 14,366 Region Association: None ![]() |
All the parts are original with NOS Bosch fuel injectors , we had 3 sets to choose from
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JeffBowlsby |
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#17
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914 Wiring Harnesses ![]() ![]() ![]() ![]() ![]() Group: Members Posts: 8,548 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None ![]() ![]() |
There are several FI troubleshooting guides here:
http://bowlsby.net/914/Classic/TechNotebook.htm And if you determine that you need a new harness...let me know. (IMG:style_emoticons/default/wink.gif) |
mgphoto |
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#18
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"If there is a mistake it will find me" ![]() ![]() ![]() Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California ![]() |
Your FI points in the distributor have grease on them.
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McMark |
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#19
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914 Freak! ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None ![]() |
Did you take the fuel tank out? Pinched fuel lines underneath are a common problem.
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cal914 |
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#20
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Member ![]() ![]() Group: Members Posts: 319 Joined: 12-April 12 From: United Kingdom Member No.: 14,366 Region Association: None ![]() |
Yes ,removed the tank and cleaned, the sock was all clear.On top of the ECU there's a grey knob that turns and clicks is there a best position for the knob to be to help with the running of the FI
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