 FI cold start |
|
|
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
|
  |
| TheCabinetmaker |
 Jan 14 2018, 08:31 AM
Post
#21
|
|
I drive my car everyday  Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666  |
Whoa! You said cold start valve. Are you sure? That's not the same as auxiliary(supplemental) air valve.
|
   |
 
|
| McMark |
Jan 14 2018, 09:51 AM
Post
#22
|
|
914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
The cold start valve on a stock D-Jet FI ONLY operates when two conditions are true.
1) When the temp is below XX degrees. The thermo-time switch below plenum handles this, not the ECU, not the head temp sensor, not the air temp sensor. ---AND--- 2) When the starter is cranking. Ones the engine fires and you let go of they key, the CSV turns off. To put it a different way, the CVS has two wires -- power and ground. Power is supplied through the yellow starter wire. If the starter is turning the CSV has power. If the starter is not turning, the CSV has no power supply. Ground for the CSV is through the Thero-time switch. This is a simple temp controlled switch. If the thermo-time switch is below XX degrees then the CSV has a ground connection. If the temp is above XX then there is no ground and the CSV can't spray. It's a pretty smart system that simply evaluates two conditions, BOTH of which must be true in order for the CSV is open and spray fuel. Most people consider it a fuel injection component, but to my way of thinking, it's a completely independant, stand-alone system. You could remove the ECU completely, and the CSV system will still operate. |
|
|
|
| r_towle |
Jan 14 2018, 10:01 AM
Post
#23
|
|
Custom Member Group: Members Posts: 24,562 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
|
QUOTE(McMark @ Jan 14 2018, 10:51 AM)  The cold start valve on a stock D-Jet FI ONLY operates when two conditions are true. 1) When the temp is below XX degrees. The thermo-time switch below plenum handles this, not the ECU, not the head temp sensor, not the air temp sensor. ---AND--- 2) When the starter is cranking. Ones the engine fires and you let go of they key, the CSV turns off. To put it a different way, the CVS has two wires -- power and ground. Power is supplied through the yellow starter wire. If the starter is turning the CSV has power. If the starter is not turning, the CSV has no power supply. Ground for the CSV is through the Thero-time switch. This is a simple temp controlled switch. If the thermo-time switch is below XX degrees then the CSV has a ground connection. If the temp is above XX then there is no ground and the CSV can't spray. It's a pretty smart system that simply evaluates two conditions, BOTH of which must be true in order for the CSV is open and spray fuel. Most people consider it a fuel injection component, but to my way of thinking, it's a completely independant, stand-alone system. You could remove the ECU completely, and the CSV system will still operate. Or, when it’s old and stuck open or semi open to enriched your mixture all the time, specifically designed to drive you crazy. |
|
|
|
| Rand |
Jan 14 2018, 06:18 PM
Post
#24
|
|
Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
QUOTE "I now understand why folks go the carburation" NOOOOO, you understand better why FI is better! You have it backwards. Tweak in the FI, and harmony. Tweak in carbs and the dance continues. :chairbeat: |
|
|
|
|
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:
|
Lo-Fi Version | Time is now: 24th April 2024 - 11:19 PM |
Invision Power Board
v9.1.4 © 2024 IPS, Inc.