# Porsche 914 runs rough **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [May 19, 2008, 12:26am UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180 "2008-05-19T00:26:47Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![tomlisa5](https://avatars.discourse-cdn.com/v4/letter/t/b77776/32.png) [@tomlisa5](https://community.cartalk.com/u/tomlisa5)\ **Post date:** [May 19, 2008, 12:26am UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180/1 "2008-05-19T00:26:47Z")
I recently bought a 1974 fuel injected 914. It runs OK for the first 5-10 minutes but then starts to run very rough and lacks power. Any thoughts? Thanks ---
**Author:** ![Joseph\_E\_Meehan](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/joseph_e_meehan/32/21_2.png) [@Joseph\_E\_Meehan](https://community.cartalk.com/u/Joseph_E_Meehan)\ **Post date:** [May 19, 2008, 12:42am UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180/2 "2008-05-19T00:42:48Z")
I would start with the ignition system. Plugs wires, rotor cap coil etc. Next I would check the fuel pump pressure and volume How are the fuel and air filters ---
**Author:** ![MG-McAnick](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/mg-mcanick/32/188_2.png) [@MG-McAnick](https://community.cartalk.com/u/MG-McAnick)\ **Post date:** [May 19, 2008, 12:46am UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180/3 "2008-05-19T00:46:58Z")
You need a Porsche 914 website like [http://www.porsche914.org/](http://www.porsche914.org/) or [http://www.914club.com/bbs2/index.php](http://www.914club.com/bbs2/index.php) I remember that those cars had rather finicky injection systems, even when they were new. They can’t be much better 34 years later. ---
**Author:** ![Craig58](https://avatars.discourse-cdn.com/v4/letter/c/3da27b/32.png) [@Craig58](https://community.cartalk.com/u/Craig58)\ **Post date:** [May 19, 2008, 1:00am UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180/4 "2008-05-19T01:00:23Z")
You definitely need a manual, it it runs well while cold I would check the temperature sensor and the connection to the sensor first. I permanently solved those types of problems by installing a pair of webers on mine. ---
**Author:** ![Craig58](https://avatars.discourse-cdn.com/v4/letter/c/3da27b/32.png) [@Craig58](https://community.cartalk.com/u/Craig58)\ **Post date:** [May 19, 2008, 1:19am UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180/5 "2008-05-19T01:19:42Z")
Also, do you know when the valves were last adjusted? ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [May 19, 2008, 5:05am UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180/6 "2008-05-19T05:05:54Z")
I’ll go along with Craig on this one about checking the valve adjustment; a rather regular event. At least if proper procedures are followed. Another possibility is a faulty temp sensor which can be a common problem. If the car were mine I would run a compression test as step no. 1. It’s better to make sure the mechanicals are good (hopefully no tight valve problem) before tossing parts at it. Should have added that it should also be checked for intake leaks which can be a real problem. ---
**Author:** ![tomlisa5](https://avatars.discourse-cdn.com/v4/letter/t/b77776/32.png) [@tomlisa5](https://community.cartalk.com/u/tomlisa5)\ **Post date:** [May 23, 2008, 12:23am UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180/7 "2008-05-23T00:23:28Z")
Thanks to all for your feedback. I’ll be working through your suggestions as time allows. Tom ---
**Author:** ![researcher](https://avatars.discourse-cdn.com/v4/letter/r/edb3f5/32.png) [@researcher](https://community.cartalk.com/u/researcher)\ **Post date:** [May 23, 2008, 7:12pm UTC](https://community.cartalk.com/t/porsche-914-runs-rough/14180/8 "2008-05-23T19:12:52Z")
I am not sure about this year. A lot of early injection systems had a thermotime switch that kept the start injector running a short time after the engine was started. If this is not turning off that injector the engine will run excessively rich once the engine no longer needs that fuel. Just an idea I remembered