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 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Apr 2013
Posts: 17
Refitted engine not firing on all cylinders!

Hmmm,
Just refitted the engine in my SC after a body resto. Tidied up the tinware and changed manfolds and some seals, but other than a change of oils & filters, nothing else done on the unit.
fired up after oil primed and fuel sent through, just not on all cylinders!

Could it be an air lock in the CIS fuelling system?

Cheers

Old 09-17-2014, 10:35 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
ROW '78 911 Targa
 
timmy2's Avatar
 
Join Date: Jul 2011
Location: Salem, OR
Posts: 10,214
Garage
Did you bleed the system?
Turn on the ignition and lift the lever in the air box to get fuel to flow to the injectors. If they are squealing they are primed.
Doesn't take more than a few seconds. Don't do it longer that 3-5 seconds as it will flood the cylinders.


Sent from my iPhone using Tapatalk
__________________
Dennis
Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C
Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds.
Old 09-17-2014, 11:09 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
French Import
 
zippy_gg's Avatar
 
Join Date: Jul 2009
Location: Kennesaw, GA, USA
Posts: 2,047
Garage
Did you at some point remove the spark plug wires, on either the plug or dizzy side?
If so check that they were reconnected to the proper cylinder. That should take care of basic spark since other cylinders are firing
Also check that all fuel injector connectors are on correctly. Fuel
Did you make sure you removed any rags left behind when putting back on the intake manifold? Air
__________________
Gilles & Kathy

Happiness is not having a Porsche in the garage... Happiness is having a Porsche on the road!
86 Porsche 911 Cabriolet, 2011 BMW 1200RT, 03 Saab 93 Cabriolet, 06 MB E350 Estate
Old 09-17-2014, 11:10 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Brew Master
 
cabmandone's Avatar
 
Join Date: Jul 2013
Location: Delphos OH
Posts: 32,107
Garage
My guess is somehow you got your timing whacked or put a plug wire on the wrong cylinder.
Did you pull plugs or change plug wires?
Old 09-17-2014, 05:24 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Fleabit peanut monkey
 
Bob Kontak's Avatar
 
Join Date: Nov 2007
Location: North Canton, Ohio
Posts: 20,705
Garage
Quote:
Originally Posted by stuarts View Post
and changed manfolds...............
The ol' manfold change can wreak havoc.

Expound upon this.

Also, where are you based?
__________________
1981 911SC Targa
Old 09-17-2014, 07:02 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Banned
 
Join Date: Nov 2007
Location: Rockwall, Texas
Posts: 8,559
Quote:
Originally Posted by Bob Kontak View Post
The ol' manfold change can wreak havoc.
It looks like April followed my instructions!
Old 09-17-2014, 07:37 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered User
 
Join Date: Apr 2013
Posts: 17
All plugs are wired up correct, I marked up the dizzy so that's gone back in the same position.

So, whats this story with the manifolds?
Old 09-17-2014, 11:16 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered User
 
Join Date: Apr 2013
Posts: 17
So, doesn't appear to be a timing or loose plug issue.

Definitely feels like it's not getting fueled properly, will fire up instantly, sounds like a rough beetle at idle (though does idle). real hesitant throttle response, then when backing off the throttle (only took it to 3 thou, not really revved), revs drop right off then flutter.

Nothing has been adjusted before/during/since the engine refitted.
Old 09-22-2014, 02:58 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
83 911 Production Cab #10
 
JJ 911SC's Avatar
 
Join Date: Jun 2009
Location: Ottawa, Ontario, Canada
Posts: 11,134
Garage
Maybe firing on one bank only...

Listen to the injectors (Stethoscope or long screw driver) to see if all six are clicking.

__________________
Who Will Live... Will See

83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
Old 09-22-2014, 04:13 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 07:51 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 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.