Won't start! Will start if I coast down hill and pop clutch! |
|
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. |
|
Won't start! Will start if I coast down hill and pop clutch! |
Ian Stott |
Jul 1 2017, 05:18 AM
Post
#1
|
Senior Member Group: Members Posts: 907 Joined: 28-January 08 From: Moncton/Canada Member No.: 8,635 Region Association: Canada |
As described! What is up with this situation? Engine runs beautiful when warmed up, will restart no problem if It has been shut off for even a few hours. Kudos to the battery and starter as I have tried to start it normally when it has been sitting for a few days, won't catch, thank goodness I live on a hill, coast down the hill a bit, put her in 3rd gear pop the clutch and vrooom! Have done this 6 times now!
Ian Stott Moncton Canada |
Spoke |
Jul 3 2017, 09:03 PM
Post
#2
|
Jerry Group: Members Posts: 6,991 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None |
So it doesn't start when cold but will start if you push/coast start it?
What are the differences in both methods? Engine speed: Starter: slow Coast: slow Ok, so engine speed should not be the issue. Extra fuel when cranking: Starter: YES, the ECU extends the injector pulses to put in more fuel when cranking. Coast: NO, the ECU sets injector pulse width by temp of engine/ambient/CHT Here's a difference, pulse width during cranking may be flooding the engine. Maybe not. Does the engine run rich? Have you had the AFR checked? Voltage at coil: Starter: Voltage at coil will be lowered by IR drops in the wiring applying less voltage at the coil. Coast: Voltage should be close to battery voltage since starter is not cranking. Check the voltage at the coil with a voltmeter when cranking. Measure from coil + wire to engine case ground, not the battery ground. Also, pull a plug wire and install a spare plug on the wire and ground the plug and look for spark when cranking. |
Lo-Fi Version | Time is now: 8th June 2024 - 01:12 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |