LPG Forum


All times are UTC



Post new topic Reply to topic  [ 2 posts ] 
Author Message
 Post subject: Miss fire
PostPosted: Wed Apr 11, 2018 5:18 pm 
New member

Joined: Mon Oct 10, 2011 6:06 pm
Posts: 46
My Vitara has developed a mid range miss fire and a lumpy tick over that gets worse when warm
I have replaced the plugs and coils but she still isn't right If you are gentle with the throttle there is a hesitation /miss if however you are heavy footed it rev's out no missing.
Its a bit like a over jetted rich carb that works only at full chat.
Can the gas trims go out to make her run rich?
Am I right in thinking the gas ECU follows the petrol in fueling ?
As you may guess I have no idea I used to leave it to TUBBS :D


Top
 Profile  
Reply with quote  
 Post subject: Re: Miss fire
PostPosted: Wed Apr 11, 2018 11:26 pm 
Intermediate Member

Joined: Mon Jan 23, 2012 12:21 pm
Posts: 1015
Location: Milton Keynes
edge wrote:
My Vitara has developed a mid range miss fire and a lumpy tick over that gets worse when warm
I have replaced the plugs and coils but she still isn't right If you are gentle with the throttle there is a hesitation /miss if however you are heavy footed it rev's out no missing.
Its a bit like a over jetted rich carb that works only at full chat.
Can the gas trims go out to make her run rich?
Am I right in thinking the gas ECU follows the petrol in fueling ?
As you may guess I have no idea I used to leave it to TUBBS :D


First thing you need to work out is if it does the same on both petrol and lpg - if its just lpg it may be an injector playing up, or a tired vapouriser causing issues (the ecu shouldn't have lost its settings or anything as it still attempts to run, so that suggests something isn't quite right, but theres not enough info there to suggest what - maybe a sticky injector or a few other possibilities).

Start by seeing what it does on petrol - it might take a few miles on petrol to return to normal running if its thrown the trims off. It might also help to scan the petrol side with diagnostics and see if it gives any error codes if you have access, as these might give a clue which cylinders are the problem.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group