Register Login
Shop4Parts - UK's largest online superstore for FIAT and Alfa Romeo parts
Reply
 
Thread Tools
Old 06-04-2017   #1
Join Date: Apr 2017
Posts: 2
Thanks: 0
Trader Rating: 0
USA 
Mysterious Stalling Issues

Heyo folks, So recently I got myself a 1979 Fiat x1/9 and the car has made a lot of progress and its nearly drivable but still encounters some residual issues.

I've replaced the throttle cable, done a full tune up, made the swap to an electric fuel pump, stuff that I thought would solve the issue as when I drive the car it'll do so fine until after 10 or 15 minutes maybe the car will stop responding to my throttle inputs and the revs will drop until the car ultimately stalls. I can restart the car with no problem, it holds an idle just fine and I can really only drive it by slipping the clutch until it starts to move and then chug along at like 5mph

I'm drawn to believe its a carburetor issue as after the most recent drive the car limped home, I popped the hood and there was a distinct sizzling coming from the carbuertor, I couldn't exactly locate it but it was there.

Although I did notice something peculiar as I pulled it into the driveway, with the clutch pressed in I could tap the gas and it would rev up just fine when just moments earlier it would try and buck and kick if I gave it gas while chugging along in first

Also if it helps for whatever reason, I've noticed that the car feels and drives fine but at around 4k rpm it starts to take off and has significantly more power (the secondary kicks on I presume and its a Weber 28/30 I believe)
Likes varesecrazy liked this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides


Last edited by Epicsockzebra; 06-04-2017 at 05:34.
Epicsockzebra is offline Reply With Quote Quote 
Old 06-04-2017   #2
Join Date: Jan 2008
Location: Poole, Dorset
Posts: 1,360
Thanks: 58
Trader Rating: 0
United Kingdom 
Re: Mysterious Stalling Issues

Hi

The x1/9s do suffer from fuel vapour lock in the carb due to the exhaust manifold making the area very hot.

Fiat originally fitted a carb cooling fan to try and help the problem. I think the issue is worse now the cars are old, most have lost their exhaust heat shield which probably rusted away long ago. So replace with something if you can.

If the cars been put back on the road its always a good idea to replace the fuel lines to reduce the risk of leaks and engine fire. A very good idea is to add insulation to the fuel lines to try and reduce the heat transfer.

The electric fuel pump will help as it will circulate fuel more quickly.

The carb might benefit from a rebuild? And a fresh in-line fuel filter is a good idea if you don't already have one.

Let is know how you get on
__________________

Last edited by purf; 06-04-2017 at 21:39.
purf is offline Reply With Quote Quote 
Old 07-04-2017   #3
Join Date: Apr 2017
Posts: 2
Thanks: 0
Trader Rating: 0
USA 
Re: Mysterious Stalling Issues

I have two new fuel filters already, with new lines as well. I've been thinking about getting some insulation as well because the way I have the lines routed means that they're experiencing a fair bit of heat once the engine gets hot.

I'm definitely considering a rebuild at the point and have already called oreillys to get them to have a rebuild kit shipped in, but I've also been doing some reading that suggests that I might need a thicker gasket on the base of the carb? Apparently this might help reduce the amount of heat that gets transferred to the carburetor from the manifold and I'm thinking its something to do with this given the distinct sizzling sound which could be heard coming from the carb

Also I checked and the exhaust heat shield is still in place although I find the location of the exhaust manifold to be weird given how close it is to the carb
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides


Last edited by Epicsockzebra; 07-04-2017 at 18:36.
Epicsockzebra is offline Reply With Quote Quote 
Old 08-04-2017   #4
Join Date: Mar 2012
Location: Oamaru
Posts: 498
Thanks: 36
Trader Rating: 0
Maigretnz has donated!
New Zealand 
Re: Mysterious Stalling Issues

Heat can also affect the coil and condenser. Unless the weather is very hot it shouldn't cause trouble with carb on a short run.
Try unbolting the engine cover to see if it helps
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Maigretnz is offline Reply With Quote Quote 
Old 08-04-2017   #5
Join Date: Jan 2008
Location: Poole, Dorset
Posts: 1,360
Thanks: 58
Trader Rating: 0
United Kingdom 
Re: Mysterious Stalling Issues

There should also be a plastic drip tray between the carb and the manifold. I think this means there are two paper gaskets.
__________________
purf is offline Reply With Quote Quote 
Old 2 Weeks Ago   #6
Join Date: Nov 2017
Posts: 1
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: Mysterious Stalling Issues

hi, hope u have found the problem, sounds like it could be a blocked fuel filter or pick up feed, im having the same troubles with mine will check mined not blocked tomorrow
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

olliefromuk is offline Reply With Quote Quote 
Old 2 Weeks Ago   #7
Join Date: Nov 2009
Location: Sheffield
Posts: 27
Thanks: 3
Trader Rating: 0
United Kingdom 
Re: Mysterious Stalling Issues

I had a similar issue with my old car, after new plugs, fuel pump and carb rebuild, I eventually found that the problem was with the coil unit.

I am having new issues with my current car though, which is fuel starvation when going uphill at higher revs. I have fitted electric fuel pump and electronic ignition, new coil etc but I have been told it might be carb related.
Apparently the float might not be weighted properly - the science bit was explained to me by modern fuel being less dense than back when the car was built, causing the float to sit higher and therefore closing off the fuel supply prematurely.
A job for winter is to get the carb rebuilt and/or place additional weight on the float to see if that helps matters... a friend also suggested extending the fuel pick up pipe to sit lower in the chamber...

Both could be worth investigating, although the coil would be the cheapest and easiest solution.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

X19 pilot is online now Reply With Quote Quote 
Old 1 Day Ago   #8
Join Date: Jan 2017
Posts: 2
Thanks: 0
Trader Rating: 0
USA 
Re: Mysterious Stalling Issues

I had a similar issue with my Fiat after going through the carborator and electrical it ended up being the immitions canister in the back left of the engine compartment that feeds the intake manifold below the carborator had a small tear in it.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

LarryLadewig is offline Reply With Quote Quote 
Reply
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not 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

Forum Jump
Similar Threads
Thread Thread Starter Forum Replies Last Post
(T) Panda clock resetting and intermittent stalling issues NickyMarie Panda 3 02-12-2016 12:41
(T) Stalling Issues j1mdarcs X1/9 3 08-07-2011 00:11
(T) Yet more issues - stalling MadMan0 Punto (Mk1) 14 21-07-2010 14:00
(T) '06 Punto Active Sport (1.2) Stalling/Steering Issues cs03dmj Punto (Mk2/2b) 3 13-03-2009 19:59
(G) Mysterious Third Headlight? zoe.walters Punto (Mk2/2b) 11 22-04-2004 02:13