Lancia Motor Club Forum Banner
23 June, 2024, 11:02:02 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Need to contact the Forum Administrator? e-mail forum.admin@lanciamc.co.uk, for Database Administrator e-mail database.admin@lanciamc.co.uk      -      Copy deadline for Viva Lancia is 12th of each month.      -      For Events e-mail events@lanciamc.co.uk      -      To Join the club go to http://www.lanciamc.co.uk/join.htm
 
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
  Print  
Author Topic: Misfire  (Read 1478 times)
0 Members and 1 Guest are viewing this topic.
coltom
Lapsed
Member
***
Posts: 29


« on: 16 September, 2023, 11:27:25 AM »

Should there be a Ďgrommetí thing holding the plug leads in the holder on the cam cover- see pic. My leads are loose in this holder and resting on the cam cover. Itís developed a misfire under acceleration and wonder if one or more lead is shorting as theyíre not being held away from the engine.


* 79178050-1713-43A8-9BAD-F4245C3241CB.jpeg (3616.09 KB, 4032x3024 - viewed 49 times.)
Logged
lancialulu
Press Officer
Permanent resident
*****
Posts: 4960



« Reply #1 on: 16 September, 2023, 12:29:02 PM »

Look at night! I see you have a 123. These produce a much hotter spark (especially if the correct coil is used) did the leads come with the kit?
Logged

Its not the winning but taking part! or is it taking apart?
Lancias:
1955 Aurelia B12
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia Sport 1600
1983 HPE VX
1988 Delta 1.6GTie
1998 Zeta 21.  12v
Wangler
Megaposter
*
Posts: 276


« Reply #2 on: 16 September, 2023, 12:43:05 PM »

These leads should never be bunched together. That said, they shouldn't "leak" if they're good quality and in good condition.

I wonder if you might be getting an induced HT pulse due to the leads being bound together? At stated earlier, the spark is going to be more powerful with the 123 set-up if you have high power coil such as a Bosh Red. Anyway, get yourself the proper Lancia holder that attaches using a cam cover bolt.
Logged

Fulvia Coupe 1976
Fulvia Coupe 3 1975
coltom
Lapsed
Member
***
Posts: 29


« Reply #3 on: 16 September, 2023, 02:15:41 PM »

These leads should never be bunched together. That said, they shouldn't "leak" if they're good quality and in good condition.

I wonder if you might be getting an induced HT pulse due to the leads being bound together? At stated earlier, the spark is going to be more powerful with the 123 set-up if you have high power coil such as a Bosh Red. Anyway, get yourself the proper Lancia holder that attaches using a cam cover bolt.

Do you mean the tube as in pic below (my car is series 1 Rallye)?


* 4E0C2FD0-7FF8-4A75-9E83-90D37D256321.jpeg (91.48 KB, 1000x667 - viewed 52 times.)
Logged
waterman42
Member
**
Posts: 18



« Reply #4 on: 16 September, 2023, 02:50:05 PM »

Funnily enough I am about to fit some plug lead separators and other tweaks to avoid contact between leads and bits of earthed metal. A knowledgeable friend who was helping me out with my coolant leak issue spotted this and I'm taking his advice. Problem partly due to lead on no.1 which is the longest isn't quite long enough compared with the others, or in the alternative others are a tad too long. It came as a set so I'm wary of trying DIY length adjustment.
Logged

Hugh A
25 years an Alfa 105er
but finally an S3 Fulvia
Wangler
Megaposter
*
Posts: 276


« Reply #5 on: 16 September, 2023, 02:58:02 PM »

These leads should never be bunched together. That said, they shouldn't "leak" if they're good quality and in good condition.

I wonder if you might be getting an induced HT pulse due to the leads being bound together? At stated earlier, the spark is going to be more powerful with the 123 set-up if you have high power coil such as a Bosh Red. Anyway, get yourself the proper Lancia holder that attaches using a cam cover bolt.

Do you mean the tube as in pic below (my car is series 1 Rallye)?


Don't know about the S1, but S2&3 uses one of these, with grommets:


* CF61ABBD-AE92-4800-AB2D-3653AF0DDA35_4_5005_c.jpeg (18.06 KB, 400x300 - viewed 206 times.)
Logged

Fulvia Coupe 1976
Fulvia Coupe 3 1975
Beckerman67
Member
****
Posts: 82



« Reply #6 on: 16 September, 2023, 04:47:13 PM »

 In addition to previous answers, it would be worth checking and/or investing in a set of silicone leads.
 These are generally 8mm in diameter as opposed to 7mm for the standard PVC insulated.
 Quoting one supplier their silicone leads " have a temperature resistance from -60įC to +180įC and a breakdown strength of 40,000 volts."
 Their standard leads "have a temperature resistance from -40 į C to + 85 į C."
Logged
fay66
Permanent resident
**
Posts: 6201



« Reply #7 on: 16 September, 2023, 04:58:26 PM »

These leads should never be bunched together. That said, they shouldn't "leak" if they're good quality and in good condition.

I wonder if you might be getting an induced HT pulse due to the leads being bound together? At stated earlier, the spark is going to be more powerful with the 123 set-up if you have high power coil such as a Bosh Red. Anyway, get yourself the proper Lancia holder that attaches using a cam cover bolt.
.
Leads on S1 go through a tube all bunched together and this is held by a bracket, that is attached to the lower rear  cam cover holding screw.
Brian
8227 Cool


* IMG-20230914-WA0007.jpg (410.28 KB, 1496x1496 - viewed 51 times.)

* IMG-20230916-WA0002.jpg (400.19 KB, 1496x1496 - viewed 48 times.)
« Last Edit: 16 September, 2023, 05:01:52 PM by fay66 » Logged

Own 1966 Fulvia 2C Berlina since 1997, back on road 11-1999.Known as "Fay"
2006 Renault Megane 1 5 Dci Sports Tourer
Dedra Technical Adviser
nthomas1
Rebel Poster
*
Posts: 848



« Reply #8 on: 16 September, 2023, 05:27:00 PM »

This is my S2, with the plug leads fed through the bracket attached to the cam cover.  I used cable ties to denote which cylinder each lead was for.  Of course you only need to label the first three, but the OCD side of me insisted on 4 cable ties on the fourth lead!


* g Engine Bay copy.JPG (68.98 KB, 404x289 - viewed 162 times.)
Logged

Norm Thomas
Ormskirk, Lancashire

Own:
1973 Fulvia S2 Coupe
Previous Lancias: S2 Coupe and S3 Coupe in late 1970s
coltom
Lapsed
Member
***
Posts: 29


« Reply #9 on: 16 September, 2023, 05:35:21 PM »

OK thanks everyone. Iíve found a rubber tube that may be suitable. Iíll separate the leads and feed through tube to hold them in place. Also-
- does someone know a source for silicon HT leads for a Series one?
- it looks as though my 123 ignition is using the original coil. Should it be using something beefier and, if so, what?
Logged
Wangler
Megaposter
*
Posts: 276


« Reply #10 on: 16 September, 2023, 07:24:26 PM »

OK thanks everyone. Iíve found a rubber tube that may be suitable. Iíll separate the leads and feed through tube to hold them in place. Also-
- does someone know a source for silicon HT leads for a Series one?
- it looks as though my 123 ignition is using the original coil. Should it be using something beefier and, if so, what?

A Bosch Red coil seems to be the favoured one. Works well on my S3, but there again so did the original Magneti Marelli.
Logged

Fulvia Coupe 1976
Fulvia Coupe 3 1975
coltom
Lapsed
Member
***
Posts: 29


« Reply #11 on: 17 September, 2023, 01:46:36 PM »

Leads separated, cleaned and fed through appropriate rubber tube (bicycle handlebar grip with end cup of!). Looks much better. Will have to wait for dry weather to see if it runs any better.


* 388FE817-6706-49B1-B212-F59726ADB2E7.jpeg (2578.47 KB, 4032x3024 - viewed 59 times.)
Logged
nistri
Megaposter
*
Posts: 542


« Reply #12 on: 18 September, 2023, 06:45:53 AM »

I noted you are not using a standard distributor cap. By the way, the use of silicone leads has received mixed opinions, probably OK with strong electrical pulses from 123 but not ideal with standard ignition as silicone leads are said to have higher resistance.
Logged

Andrea Nistri

Ardea S2
Appia S2
Fulvia GTE
Fulvia Sport 1.3 S
Fulvia Montecarlo
Fulvia Coupe 1.3 S
Wangler
Megaposter
*
Posts: 276


« Reply #13 on: 19 September, 2023, 09:15:16 AM »

I noted you are not using a standard distributor cap. By the way, the use of silicone leads has received mixed opinions, probably OK with strong electrical pulses from 123 but not ideal with standard ignition as silicone leads are said to have higher resistance.

I think this is a good source of info.

Silicone is a great insulator, it isn't a conductor. So, unless I've misunderstood the above comment, silicone leads (with a suitable core) are the best available because of silicone's complete lack of conductivity.

https://blog.simonbbc.com/2022/10/14/what-are-ht-leads-what-do-they-do-in-my-classic-car/
« Last Edit: 19 September, 2023, 10:12:05 AM by Wangler » Logged

Fulvia Coupe 1976
Fulvia Coupe 3 1975
Pages: [1]   Go Up
  Print  
 
Jump to:  

Contact the Forum Administrator

LMC Forum copyright © 2007 - 2021 Lancia Motor Club Ltd

Powered by SMF 1.1.20 | SMF © 2006-2011, Simple Machines
Page created in 0.046 seconds with 20 queries.