Register Login
FIAT Auto Specialist Team
Reply
 
Thread Tools
Old 01-03-2005   #1
Join Date: Feb 2005
Posts: 5
Thanks: 0
Trader Rating: 0
Injectors remaining open too long?

Hi all,

My punto is over fueling like mad, to the extent it would not start. Apparently the reason it is overfueling is that the injectors are reading to be remaining open for a period of 3 to 5mm seconds and the norm should be about 1mm. The ECU seems to be reading all the sensors OK and the coolant temp sensor appears to be OK. Any ideas on what is causing the inectors to remain open for so long? Any ideas / advice a appreciated.

__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Tiz is offline Reply With Quote Quote 
Old 01-03-2005   #2
Join Date: Aug 2003
Location: Essex/Suffolk border
Posts: 82,433
Thanks: 1458
Trader Rating: 10
dave has donated!
dave is an official FF Advertiser
dave is an honorary friend of the forum :)
United Kingdom 
Re: Injectors remaining open too long?

dunno, not fitted one of them ebay resistors have you? try a bottle of injection cleaner in the tank only £5 so worth a try.
__________________
dave is offline Reply With Quote Quote 
Old 01-03-2005   #3
Join Date: Jan 2005
Location: stretford
Posts: 525
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: Injectors remaining open too long?

congrats on 6 k post dave
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

GhettoMoose is offline Reply With Quote Quote 
Old 01-03-2005   #4
Forum Moderator
 
T14086's Avatar
Join Date: Sep 2004
Location: Preston
Posts: 29,985
Thanks: 1063
Trader Rating: 0
T14086 has donated!
United Kingdom 
Re: Injectors remaining open too long?

4 m/s at idle is the norm nothing wrong there.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

T14086 is offline Reply With Quote Quote 
Old 01-03-2005   #5
Join Date: Mar 2005
Posts: 1
Thanks: 0
Trader Rating: 0
Re: Injectors remaining open too long?

does any body know what the injection light on the dashboard of a punto elx 90 means if it stays on? What do I need to do?
Tim
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

tim.wright is offline Reply With Quote Quote 
Old 02-03-2005   #6
Join Date: Feb 2005
Posts: 5
Thanks: 0
Trader Rating: 0
Re: Injectors remaining open too long?

Thanks for the reply, hmmm 4 m/s is ok at idle.

I was told that it should be about 1 m/s, but 3 m/s to 5m/s is too high, hence the injectors are staying open too long and the car is running fuel rich.
The car failed its emissions test on this item alone.

Someone suggested the throttle position sensor, it has not come up as a fault on the ECU reading, but could this be causing the problem.

I have also been told that the vacuum in the clyinder area is too low (about 500 and it should read about 360) and the ecu feels that more fuel is required. (does this make sense)?
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Tiz is offline Reply With Quote Quote 
Old 02-03-2005   #7
Forum Moderator
 
T14086's Avatar
Join Date: Sep 2004
Location: Preston
Posts: 29,985
Thanks: 1063
Trader Rating: 0
T14086 has donated!
United Kingdom 
Re: Injectors remaining open too long?

3.5-4.0 m/s (Sequential/singlepoint injection)
2.5-3.0 m/s (Simultaneous/multi)

Also take into account temperature of engine/choke/engine wear etc etc.Remember injectors might be staying open for longer to compensate for a fault but might not directly be the fault or only one of them might be faulty....confusing myself now

Punto's often fail MOT emission tests(dont ask me why i'm not a MOT tester)but i'm sure there are posts on this site about this & dealers have a bulletin aswell,changing the lambda doesn't always help!

Have you had any stored codes read yet? What were they?
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

T14086 is offline Reply With Quote Quote 
Old 02-03-2005   #8
Join Date: Feb 2005
Posts: 5
Thanks: 0
Trader Rating: 0
Re: Injectors remaining open too long?

I think I get it,

Mine is a 1995 Punto Selecta N reg, A single point injection.

Appreciated that the injectors could be remaining open to compensate for something else. The diagnostics came back with three faults.

Lambda Sensor
Low Battery Voltage
Injector Circuit -

Any ideas.

Also for further information the pressure in the clynider was reading about 500 ish and I believe the pressure should be around the 360 mark.

Any tips.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

Tiz is offline Reply With Quote Quote 
Old 03-03-2005   #9
Forum Moderator
 
T14086's Avatar
Join Date: Sep 2004
Location: Preston
Posts: 29,985
Thanks: 1063
Trader Rating: 0
T14086 has donated!
United Kingdom 
Re: Injectors remaining open too long?

Apparently........ the MOT tester shouldnt use the ignition pick up on the emission tester but use the vehicles tacho to hold steady revs,this depends on what it failed on,sorry my attention span is short so lost interest after a bit but hopefully someone else can confirm this.
Judging my your fault codes i'd investigate the lambda sensor first.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides

T14086 is offline Reply With Quote Quote 
Old 03-03-2005   #10
Join Date: Aug 2003
Location: Essex/Suffolk border
Posts: 82,433
Thanks: 1458
Trader Rating: 10
dave has donated!
dave is an official FF Advertiser
dave is an honorary friend of the forum :)
United Kingdom 
Re: Injectors remaining open too long?

Quote Originally Posted by T14086

Punto's often fail MOT emission tests(dont ask me why i'm not a MOT tester)but i'm sure there are posts on this site about this & dealers have a bulletin aswell,changing the lambda doesn't always help!
yes there is i made one sticky so should be at the top of punto tech section
__________________
dave 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) Can't open Marea Weekend boot - help! gisburne Marea 26 10-07-2006 23:24
(G) my damn bonnet won't open microphonehead Panda (Classic) 9 23-04-2005 15:56
anyone in long eaton fancy doing my a biiiig favour??? please??? Bushboy Leisure Lounge 2 02-11-2004 07:19
(T) Brava 1.8 16V injectors TBel Bravo / Brava 0 04-01-2004 05:56
(G) how long will you keep your car andi Cinquecento / Seicento 31 25-11-2003 20:40