Results 1 to 1 of 1

Thread: Early CIS and cold start

  1. 06-22-2016, 03:26 PM #1
    M_deJong
    M_deJong is offline
    Senior Member M_deJong's Avatar
    Join Date
    Jan 2011
    Location
    DFW TX
    Posts
    681

    Early CIS and cold start

    304065's post here http://www.early911sregistry.org/for...light-on-again reminded me of something I wanted to share with early CIS drivers.

    My car had the resistor installed bridging the alternator light, I believe as part of a recall or dealer upgrade. The unintended consequence of this resistor is that it affects the CIS cold start valve. The cold start is governed by a thermo-time switch. This little guy gets its juice to start the timer from a relay. This relay is supposed to only be energized when the car is running, as indicated by alternator output on D+. What I found though is that the added current flow through the alternator light with resistor was enough to energize this relay, and so my thermo-time switch was energized immediately. The result was I only got the cold start injector's participation for one or two cranks, then it cut out. Made for some difficult cold starts. Unfortunately it took me close to 15 years to figure this one out! Yeah, I'm slow.
    Last edited by M_deJong; 06-22-2016 at 04:42 PM. Reason: Math error
    Mike de Jong | '71 911T/E 2.4 Tangerine | '74 911S 3.2 Ice Green
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules


Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.