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 Technical BBS > 1- Porsche Technical Forums > Porsche 911 Technical Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Apr 2011
Location: Potomac Falls, Virginia
Posts: 54
Garage
flummoxed by CIS - help

So I decided to do a valve job on my 83 sc.

Changed the spark plugs, wires, cap, rotor, oil.

started the car and it ran fine except it had a clicking sound (probably a valve that was too loose). My Porsche enthusiast friend and perfectionist said I should do it over. I did. I double checked the work.

I started the car and it ran for a minute at 2500 RPM, then sputtered a died.

restarted . . . backfire, sputter, missfire. Sounds like a leak! I do a smoke test with a cigar but find no leaks. I do a fuel pressure test and all is good (warm and cold).

Fuel pump works.

I take out all the injectors and sleeves and replace the seals and sleeves. still sputter, backfire, dies.

It wants to start but I have no idea what I should do next. Any advice would be welcome.

Thanks in advance

BM
Old 10-08-2017, 07:42 PM
  Pelican Parts Technical Article Directory    Reply With Quote #1 (permalink)
Registered User
 
Bill Douglas's Avatar
 
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 11,116
Was one or some of the valves WAY out? THe reason I ask this is you may have done the wrong cam at the wrong time (right cam at the wrong time - oh never mind) and adjusted it right out of spec. In 25 years of 911SC ownership, and checking each year, I've only ever had maybe half a dozen valves that have needed adjusting.
__________________
see www.lyallbaybeach.co.nz
Old 10-08-2017, 08:13 PM
  Pelican Parts Technical Article Directory    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Apr 2011
Location: Potomac Falls, Virginia
Posts: 54
Garage
Am going to pull the valve covers off again and check.

Thanks Bill
Old 10-09-2017, 07:41 AM
  Pelican Parts Technical Article Directory    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Jun 2012
Location: Metro DC
Posts: 544
Garage
Ive only done a couple of valve adjustments but I am just across the river in Potomac and Id be happy to lend a hand if you are in need.

Quote:
Originally Posted by Barenecessity View Post
Am going to pull the valve covers off again and check.

Thanks Bill
Old 10-09-2017, 08:54 AM
  Pelican Parts Technical Article Directory    Reply With Quote #4 (permalink)
Hey, nice marmot.
 
tirwin's Avatar
 
Join Date: Feb 2011
Location: Marietta, GA
Posts: 4,459
Garage
Here's a thought...

What tends to happen over time is CIS gets gradually leaner with small vac leaks that get worse and worse. Owner or mechanic gradually enriches mixture over time to compensate.

Now you replaced a bunch of stuff fixing vac leaks and creating better spark energy. Your mixture is likely off.

I like Bill's idea too.
__________________
There are those who call me... Tim
'83 911 SC 3.0 coupe (NA)

You can't buy happiness, but you can buy car parts which is kind of the same thing.
Old 10-09-2017, 09:24 AM
  Pelican Parts Technical Article Directory    Reply With Quote #5 (permalink)
Registered Minimalist
 
75 911s's Avatar
 
Join Date: Aug 2015
Location: Las Vegas
Posts: 1,236
Garage
No worries you'll get it. Try again.

Get to TDC on 1, have the cap off the dizzy and make sure you are pointed at one. Grab hold of the rocker with your hand and wiggle it, you'll hear and feel the gap. Now you are ready to adjust. If the rocker doesn't move, double check your mark. Doesn't hurt to rotate the engine over again and watch the rotor go 'round till you get to one again.

Once you have re adjusted everything, double check your wires. (Actually I might do this first) One wire off the plug or in the wrong spot can cause the problems you described. When putting the plugs back on the spark plug wires, a little twisting action can make them snap right on. Give a slight tug to make sure it's really on there. The rubber dust shield sits nice and flush closing the hole. If it's not, the wire may not be seated on the spark plug.

I assume the dizzy was not changed timing wise.

What wires did you buy? Did you get the right parts on there for your 83?
__________________
Duane

http://forums.pelicanparts.com/porsche-911-technical-forum/878569-born-75-me-my-new-911s.html
Old 10-09-2017, 09:31 AM
  Pelican Parts Technical Article Directory    Reply With Quote #6 (permalink)
 
Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
Registered User
 
Join Date: Jul 2012
Location: GA
Posts: 662
I bet it's the plug wires either the wrong order or one of them is not quite connected something like that.
Old 10-09-2017, 01:13 PM
  Pelican Parts Technical Article Directory    Reply With Quote #7 (permalink)
The Mighty Pieholio
 
Bob Kontak's Avatar
 
Join Date: Nov 2007
Location: North Canton, Ohio
Posts: 13,008
Garage
Quote:
Originally Posted by gazzerr View Post
I bet it's the plug wires either the wrong order or one of them is not quite connected something like that.
Why would his engine run at 2,500 rpm for a minute, then sputter and die?

Question for BM (OP) is how smooth was the running in that minute?

A thought, when you lift your front hood does the courtesy light come on? That is in the Lambda system fuse circuit. If that fuse has blown, you will have the sputtering, backfiring, misfiring. Also, not wanting to climb in rpm's worth a snot.
__________________
1981 911SC Targa
Old 10-09-2017, 02:15 PM
  Pelican Parts Technical Article Directory    Reply With Quote #8 (permalink)
Registered User
 
universeman's Avatar
 
Join Date: Oct 2014
Location: Lone Star State
Posts: 1,110
Garage
Check your distributor rotor. I had one crack and bust on me a while back, not sure if replacement quality is as good as new/OEM.

It was just after a valve job so I was mighty confused. Just check it.
__________________
Jason - Austin, TX
82 911 SC targa
Old 10-09-2017, 02:21 PM
  Pelican Parts Technical Article Directory    Reply With Quote #9 (permalink)
Registered User
 
Join Date: Apr 2011
Location: Potomac Falls, Virginia
Posts: 54
Garage
Thank you for all of the responses. Garment, I greatly appreciate the offer to help. I may send you a PM if I get stuck.

Spent the afternoon in the engine bay and under the car. Redid all the valves. some were a little off. I need to get the covers back on and the spark plugs in, etc.

The plug wires I purchased are Clewett. Good quality. When I get it all back together. I will crank her up and report.

Many thanks to all of you

Cheers
BM
Old 10-09-2017, 04:39 PM
  Pelican Parts Technical Article Directory    Reply With Quote #10 (permalink)
Registered User
 
Join Date: Jul 2012
Location: GA
Posts: 662
I have the Clewett ones too. You know when they are seated on the plug because they give a nice "click" when they mate with the plug.

You're probably right Bob. It's just a WAG from me.
Old 10-09-2017, 06:39 PM
  Pelican Parts Technical Article Directory    Reply With Quote #11 (permalink)
The Mighty Pieholio
 
Bob Kontak's Avatar
 
Join Date: Nov 2007
Location: North Canton, Ohio
Posts: 13,008
Garage
Quote:
Originally Posted by gazzerr View Post
You're probably right Bob. It's just a WAG from me.
No criticism, whatsoever.

Interested to hear the outcome.

One dude about two years ago was talking about how his car ran like crap-o-la. Fifty hundred members said check your plug wires. He went silent for two days. Like 40 posts with complex thoughts subsequent.

Plug wires were on wrong per OP.

I beat him to death for the time lag given the effort of the members.

He has not been back. My bad.

I have no friends.

Edit: Clewett wires for me as well.
__________________
1981 911SC Targa
Old 10-09-2017, 07:13 PM
  Pelican Parts Technical Article Directory    Reply With Quote #12 (permalink)
Registered User
 
Join Date: Apr 2011
Location: Potomac Falls, Virginia
Posts: 54
Garage
Hi Bob,
Checked the courtesy light. That's the one on the passenger side of the front hood (just checking). It comes on - working. slowly eliminating problems. Got home from work and did cylinder three valves. Top side was more of a pain than before. But the valve was shut when it should be open. Could be a sign of progress. I'll do cylinder five tomorrow, put it back together, and report.

Bob, I will definitely have people double check my ignition wires.

thank you
BM
Old 10-10-2017, 05:46 PM
  Pelican Parts Technical Article Directory    Reply With Quote #13 (permalink)
The Mighty Pieholio
 
Bob Kontak's Avatar
 
Join Date: Nov 2007
Location: North Canton, Ohio
Posts: 13,008
Garage
Quote:
Originally Posted by Barenecessity View Post
Bob, I will definitely have people double check my ignition wires.
No worries. I have been taking my medicine.
__________________
1981 911SC Targa
Old 10-10-2017, 05:54 PM
  Pelican Parts Technical Article Directory    Reply With Quote #14 (permalink)
Registered User
 
Join Date: Jul 2012
Location: GA
Posts: 662
Quote:
Originally Posted by Bob Kontak View Post
No criticism, whatsoever.

Interested to hear the outcome.

One dude about two years ago was talking about how his car ran like crap-o-la. Fifty hundred members said check your plug wires. He went silent for two days. Like 40 posts with complex thoughts subsequent.

Plug wires were on wrong per OP.

I beat him to death for the time lag given the effort of the members.

He has not been back. My bad.

I have no friends.

Edit: Clewett wires for me as well.
Oh no worries. None taken!
Old 10-10-2017, 06:49 PM
  Pelican Parts Technical Article Directory    Reply With Quote #15 (permalink)
Registered User
 
Join Date: Oct 2012
Location: Chicagoland, IL
Posts: 59
Garage
after my last valve job when I replaced wires, cap, and rotor, I accidentally put the dist cap on 180 degrees out - it wasn't aligned with the locking tab. It started and ran, but it ran like crap.

I would also had to recheck where you grounded the spark wires.
__________________
1983 911SC
2005 911S
Old 10-10-2017, 07:46 PM
  Pelican Parts Technical Article Directory    Reply With Quote #16 (permalink)
Registered User
 
Join Date: Apr 2011
Location: Potomac Falls, Virginia
Posts: 54
Garage
NikosF, what do you mean about grounding the spark wires?

thanks
BN
Old 10-11-2017, 06:22 PM
  Pelican Parts Technical Article Directory    Reply With Quote #17 (permalink)
ROW '78 911 Targa
 
timmy2's Avatar
 
Join Date: Jul 2011
Location: Salem, OR
Posts: 7,788
Garage
No grounds on Clewett wires. Beru or OEM only.
__________________
Dennis
Euro 1978 SC Targa, SSI's, Dansk 2/1, Bitz kit EFI.
Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds.
Old 10-11-2017, 07:40 PM
  Pelican Parts Technical Article Directory    Reply With Quote #18 (permalink)
Registered User
 
Fixer's Avatar
 
Join Date: Aug 2012
Location: Philadelphia Area
Posts: 2,961
Wouldn't it be great if the original thread title could be edited?

I bet your valve job got out of wack. Too coincidental.
__________________
Matt Mariani, Philly Pa
RSC
1978 Super Carrera Coupe 'Foxy Brown' Mocha/Cork
1969 911E targa Crystal Blue / Black
1968 SWB 912 "Stinger 912R 1677 lbs
Old 10-12-2017, 04:50 AM
  Pelican Parts Technical Article Directory    Reply With Quote #19 (permalink)
Registered User
 
Bill Douglas's Avatar
 
Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 11,116
This is why I do valves (and oil), test drive the car, next thing such as spark plugs leads, test drive, and so on.
__________________
see www.lyallbaybeach.co.nz
Old 10-12-2017, 11:17 AM
  Pelican Parts Technical Article Directory    Reply With Quote #20 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 07:08 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2017 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.