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
 
Series900's Avatar
 
Join Date: Sep 2000
Location: Sunapee, NH
Posts: 1,109
3.6 intake backfire

Damn if I had a bang on startup yesterday, then no start, popped the lid and 4-5-6 intake hoses blew off, and the two large center hoses. Sure hope that was all the damage. Have to take the intake system apart and realign. Any cis type airbox blow up similarities to look for on the 93 3.6 intake system? At the shop sunday am, track at NHIS monday, cobblers kids need shoes....

__________________
Damon @ SERIES 900.com
Sunapee NH
several 911 variants
Old 08-08-2004, 04:59 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Moderator
 
Bill Verburg's Avatar
 
Join Date: Dec 2000
Posts: 26,437
Garage
Sounds like the reference signal from the flywheel was way off. No known issues ala cis
__________________
Bill Verburg
'76 Carrera 3.6RS(nee C3/hotrod), '95 993RS/CS(clone)
| Pelican Home |Rennlist Wheels |Rennlist Brakes |
Old 08-08-2004, 05:22 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
Series900's Avatar
 
Join Date: Sep 2000
Location: Sunapee, NH
Posts: 1,109
The starter is starting to fail, HA! Bendix is kicking out intermittently, thus not allowing full revolutions with key, think it stopped and fired at the wrong time, boom! All ripped down and reattaching boots now.
__________________
Damon @ SERIES 900.com
Sunapee NH
several 911 variants
Old 08-08-2004, 05:44 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
Series900's Avatar
 
Join Date: Sep 2000
Location: Sunapee, NH
Posts: 1,109
All good, reattached all boots, even the left side was slightly ajar, was a big boom! Stretched the legs for some coffee, ready for the track again. The starter is defintley fading away, with incomplete starts, the fuel is sent , but not enough spin time at the flywheel, thus when the spark gets compression its a, little rich! BOOM! yank the starter this week
__________________
Damon @ SERIES 900.com
Sunapee NH
several 911 variants
Old 08-08-2004, 06:54 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
Join Date: Aug 2001
Location: Brighton UK since 11/2012
Posts: 3,170
Distributor drive belt has broken, pull the caps and check that both rotors turn.
__________________
From November 2012; Precision Porsche Specialist
Sussex UK, +44 (0)1825-721-205
2001-2012 Gerber Motorsport Inc. 206-352-6911
07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red
08.16.09 1999 Kawasaki ZRX1100. Green.
Old 08-08-2004, 07:19 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Irrationally exuberant
 
ChrisBennet's Avatar
 
Join Date: Aug 2001
Location: Nashua, NH USA
Posts: 8,164
Garage
Yeah Damon, the DME shouldn't fire until it gets enough info. An incomplete spin would result in a failure to start. Lemme know if you need to borrow 964 distributor.
-Chris
__________________
'80 911 Nogaro blue Phoenix!
'07 BMW 328i 245K miles!
http://members.rennlist.org/messinwith911s/
Old 08-08-2004, 07:24 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Registered
 
Series900's Avatar
 
Join Date: Sep 2000
Location: Sunapee, NH
Posts: 1,109
Got me worried, popped secondary cap and the rotor is spinning. Phew. The problem is the starter drive is kicking out, and I get incomplete revolutions. need to check battery draw whilst cranking, Either battery low on cranking amps or starter drive is failing. Anyway the boom was due to incomplete starter revolutions resulting in a rich condition and a full spark resulted in a backfire boom, resulting in all boots off. reattached and she is running great. Thanks
__________________
Damon @ SERIES 900.com
Sunapee NH
several 911 variants
Old 08-08-2004, 11:00 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered
 
Join Date: Aug 2001
Location: Brighton UK since 11/2012
Posts: 3,170
I hope that the problem is solved, never seen that intake manifold blown off for any other reason than broken distributor belt.

With the Motronic system, an over-rich mixture at start should never happen. Check the system with the Bosch "hammer" once it's running.
__________________
From November 2012; Precision Porsche Specialist
Sussex UK, +44 (0)1825-721-205
2001-2012 Gerber Motorsport Inc. 206-352-6911
07.15.06 1996 Ducati 900SP. Suprisingly enough, it's red
08.16.09 1999 Kawasaki ZRX1100. Green.
Old 08-08-2004, 11:07 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered
 
Join Date: May 2004
Posts: 11
A similar thing happened to me a couple of years ago. It was the distributor caps/rotors (forgot which one was which...).

Cheers
__________________
FOR SALE --> Beautiful Pearl White 951

SOLD -->'90 C2 Cab
Pebble Grey Metallic
Old 08-08-2004, 02:03 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered
 
Series900's Avatar
 
Join Date: Sep 2000
Location: Sunapee, NH
Posts: 1,109
again the starter is not healthy, it will not continually crank the engine, the bendix kicks out after a third of an engine revolution. I get lucky and it fires off. think if you only keyed start for one second , the difficulty in getting the motor to catch. secondary rotor is spinning, belt good, engine runs out fine, problem lies in starter engagement, with one second spins, it is difficult to start, but hell its a race car, not stoppin for coffee, side note loaded enclosed trailer with RSA, tow from shop to home, 5 miles, hit F'n deer, never saw it, ford tough, right into bumper and under neath truck n trailer, jeez hate killin things. Hope monday is better.

__________________
Damon @ SERIES 900.com
Sunapee NH
several 911 variants
Old 08-08-2004, 07:27 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Reply


 


All times are GMT -8. The time now is 02:08 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.