|
|
|
|
| Author |
|
|
Registered User
Join Date: Jul 2013
Posts: 4
|
car jerked when engine is cold
my 930 turbo posh jerk when increase throttle. This only happen when engine is cold once after the engine is hot this problem of jerked will go away. Can anybody advise how to solve this problem. I have changed fuel injectors, fuel pump and still doesn't solve the problem
|
||
07-01-2013, 06:34 AM
|
|
|
Registered
Join Date: May 2003
Location: Woodlands TX
Posts: 3,931
|
Do you hear a thud from the CIS plate / airbox when this happens? If so maybe the control pressures need to be adjusted.
__________________
84 930 07 Exige S |
||
|
07-01-2013, 01:03 PM
|
|
|
Tinkering Pays!!
|
you're too lean when cold... lower your cold control pressure a bit... of course, get some CIS gauges and track all of your CP settings before and after.
__________________
LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR. |
||
|
07-01-2013, 03:20 PM
|
|
|
Turbofrog
Join Date: Aug 2009
Location: Europe
Posts: 1,677
|
You can turn your co screw next to air plate CW (richer) to check if that helps. Easy enough for a quick test and then dial it back the same amount to get back to were it was.
Does stock WUR have cold control pressure nut? If not there is always Brian Leask who can mod your WUR to be adjustable.
__________________
************************************************** ******************************* 10/78 930: HX40Super, MS3pro+IDX1050+044+E85, ITB, 12 Denso COPs, TrueSplit-BB/2*38WGs, Weight<1100kg |
||
|
07-01-2013, 09:43 PM
|
|
|
Registered User
Join Date: Jul 2013
Posts: 4
|
do anyone have photo CIS plate / airbox
|
||
|
07-02-2013, 05:07 AM
|
|
|
Banned
Join Date: Nov 2001
Location: top of 3rd
Posts: 4,336
|
def lean - mine jerked and bucked when lean when cold like that, esp light/part throttle down low in the revs
|
||
|
07-02-2013, 05:35 AM
|
|
|
Registered
|
Mine acts similarly, but if it is driven too soon after a cold start-up, I get a single muffled backfire then it runs normally.
Is it possible that this may be caused by vacuum leaks? All my hoses are rather old (original circa 1983)....
__________________
John Flesburg 2016 981 Boxster S.................| 1983 911 Turbo - (White) 1974 911 3.2 - Red Car........... | 1974 914-6 3.2 - (Silver) 1974 914-6 3.2, GT -(Red).......| 1974 914 - 2.7 GT Clone (TBD - Saphire?) 1971 914 (TBD)..................... | |
||
|
07-02-2013, 08:38 AM
|
|
Porsche 930
Ford Truck
