Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help

Go Back   Pelican Parts Forums > Porsche Forums > Porsche 914 & 914-6 Technical Forum

LinkBack Thread Tools Rate Thread
Thread Post New Thread    Reply
Registered User
Join Date: Oct 1999
Location: san diego,ca.usa
Posts: 313
idle cycling????

I have a '70 1.7 with stock motor and efi. When idling cold, the motor starts right up. Within 30 seconds, it seems to cycle as follows: idles around 1200, seeks for a couple seconds and idles slightly higher, then cuts out for a second and a half,almost stalling, then repeats the cycle. Once engine is warm however, this cycling stops. Could this be a cold start valve problem??? Any input would help.

[This message has been edited by mikey (edited 10-14-1999).]
Old 10-14-1999, 05:16 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
Join Date: Dec 1969
Location: Dade County, FL.
Posts: 1,145
Send a message via AIM to JP Noonan
Always check the ignition system first, but beacuse your problem is temp related it sounds more like a "lean hunt". That is, the motor is running lean and then "catches" itself, then runs rich until it almost dies. Common on closed loop EFI, but I've heard it happens on open loop 914 types also.

If you have a 72+ ECU then there is a knob on the top to adjust it. If you still have the stock ECU try this article.
Toward the end of it the author talks about adding an inline "pot" shaft, or variable resistor. This might help, or a new cylinder head temp sensor may be in order (test the CHT according to the article).

The cold start system on a 914 is a "5th injector" that ONLY squirts if the starter is turning and it is under 50 degrees.
Old 10-14-1999, 08:36 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)

Thread Tools
Rate This Thread
Rate This Thread:


All times are GMT -8. The time now is 06:24 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.