'77 with SPICA won't run right - Page 2 - Alfa Romeo Bulletin Board & Forums
 9Likes
Reply
 
LinkBack Thread Tools Display Modes
post #16 of 26 (permalink) Old 08-25-2019, 10:37 AM
Senior Member
Gold Subscriber
 
Norseman50's Avatar
 
Join Date: Apr 2014
Location: Bellevue, WA
Posts: 1,463
Garage
Quote:
Originally Posted by Boccaccia View Post
Here are the culprits. Rotor is hitting Cap from below.

I don't know why.
Both rotor and cap are "Bosch"?

Edward
'88 Quad - "Claudia"
Norseman50 is offline  
Sponsored Links
Advertisement
 
post #17 of 26 (permalink) Old 08-25-2019, 10:57 AM
Senior Member
Platinum Subscriber
 
alfaparticle's Avatar
 
Join Date: Oct 2004
Location: Columbia SC
Posts: 12,980
Quote:
Both rotor and cap are "Bosch"?
Marelli
Boccaccia likes this.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
alfaparticle is online now  
post #18 of 26 (permalink) Old 08-25-2019, 01:44 PM
Registered User
 
spiderserie4's Avatar
 
Join Date: Jul 2011
Location: Cologne, Germany
Posts: 7,214
Quote:
Originally Posted by Boccaccia View Post
Here are the culprits. Rotor is hitting Cap from below.

I don't know why.
maybe mismatched rotor and cap?
or, rebuild back then wasn't so hot and there is play in the shaft?

(you say it never ran right since you got the rebuilt dizzy from centerline.....I'd have thrown it back at them, but now its too late)

there is also this (though yours is not a plex)
https://www.alfabb.com/bb/forums/ele...nce-alert.html

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
spiderserie4 is offline  
Sponsored Links
Advertisement
 
post #19 of 26 (permalink) Old 08-25-2019, 08:06 PM
Senior Member
Platinum Subscriber
 
Roadtrip's Avatar
 
Join Date: Jan 2003
Location: Rapid City SD, Black Hills of South Dakota
Posts: 9,940
Are you sure that the rotor is oriented correctly and is fully seated on the advance weights?

CSS. For info, it anyone is unsure about the adjustment of the CSS, it should be about a quarter inch from the pump casting to the bottom of the CSS.

Microswitch. LOL. Good luck changing a microswitch in-situ.
The microswitch can easily be tested with an ordinary test light connected between the wire to the FCS and ground. Run the engine up to about 3000 rpm and snap the throttle closed. The light should come on, then go off as the engine decels through 1600-1300 rpm and recovers to idle.

Relay crank. If you need to check the relay crank, PM me and I can loan you the jig to check it and set it if necessary.

John Stewart
74 Spider
91 164S
Roadtrip is online now  
post #20 of 26 (permalink) Old 08-27-2019, 02:34 PM Thread Starter
Registered User
 
Boccaccia's Avatar
 
Join Date: Sep 2011
Location: Portland Oregon
Posts: 700
Crap.
I was wrong about the distributor cap and rotor colliding. I measured the pieces with a micrometer and there is plenty of space between the top of the rotor and the cap.

Reinstalled, checked timing and the engine still runs like crap above 3500 rpm. It sounds ragged, and when I use my timing gun, the mark on the crank jumps all over the place once the revs get up.

Timing advances normally up to 3500ish, but then starts jumping around all jittery.

Plugs are new.
Wires are six years old but have less than 5k on them.
Same with the cap and rotor.
Diz is rebuilt.
Ignition system is Pertronix.
Coil is Bosch Blue and recent.
Spark is strong.

Steve Bock
'77 Spider with SPICA
Boccaccia is offline  
post #21 of 26 (permalink) Old 08-27-2019, 06:05 PM
I know you said you've replaced the plugs twice but what you are describing is exactly what i experienced with my SPICA 2L recently. Brand new NGKs, i noticed erratic pulsing when using the timing light. You might try using the timing on each wire and see if you have a consistent pulse.

BTW, the Centerline dizzy i have uses a Pertronix module. While I've not had trouble with the dizzy i have had a number of Pertronix go bad on me....

The Brad Davisson Memorial Scholarship Fund:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
gprocket is offline  
post #22 of 26 (permalink) Old 08-27-2019, 07:49 PM
Senior Member
Platinum Subscriber
 
alfaparticle's Avatar
 
Join Date: Oct 2004
Location: Columbia SC
Posts: 12,980
There have been stories of bad Bosch coils made in Mexico. A failing coil could cause your symptoms. What coil resistance is specified for your distributor?

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
alfaparticle is online now  
post #23 of 26 (permalink) Old 08-29-2019, 04:42 AM
Registered User
 
Join Date: Dec 2009
Location: Central PA
Posts: 324
Have you checked for arcing spark? You need to do this in a pitch-black environment. At night, lights off, a heavy blanket or tarp over the engine compartment. Look for arcing at coil, dizzy cap, along secondary ignition wires and their connection to the spark plugs.
Boccaccia likes this.

ALFA ANDY
andylarry is offline  
post #24 of 26 (permalink) Old 09-19-2019, 01:38 PM Thread Starter
Registered User
 
Boccaccia's Avatar
 
Join Date: Sep 2011
Location: Portland Oregon
Posts: 700
Quote:
Originally Posted by gprocket View Post
I know you said you've replaced the plugs twice but what you are describing is exactly what i experienced with my SPICA 2L recently. Brand new NGKs, i noticed erratic pulsing when using the timing light. You might try using the timing on each wire and see if you have a consistent pulse.

BTW, the Centerline dizzy i have uses a Pertronix module. While I've not had trouble with the dizzy i have had a number of Pertronix go bad on me....
Thanks for the comment - what was your solution? Another set of plugs?

Steve Bock
'77 Spider with SPICA
Boccaccia is offline  
post #25 of 26 (permalink) Old 09-19-2019, 01:41 PM Thread Starter
Registered User
 
Boccaccia's Avatar
 
Join Date: Sep 2011
Location: Portland Oregon
Posts: 700
Quote:
Originally Posted by alfaparticle View Post
There have been stories of bad Bosch coils made in Mexico. A failing coil could cause your symptoms. What coil resistance is specified for your distributor?
My coil has about 1000 miles on it. It's the blue Bosch from Centerline.

My diz is a Marelli S103B. I don't know the recommended resistance.

Steve Bock
'77 Spider with SPICA
Boccaccia is offline  
post #26 of 26 (permalink) Old 09-25-2019, 09:43 AM
Quote:
Originally Posted by Boccaccia View Post
Thanks for the comment - what was your solution? Another set of plugs?
Replaced the plugs and filters - runs like a champ now...

The Brad Davisson Memorial Scholarship Fund:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
gprocket is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Alfa Romeo Bulletin Board & Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 
For the best viewing experience please update your browser to Google Chrome