Random Misfire
Discussion
Hi everyone, I’m still loving my first month of Tiv ownership and am getting used to her quirkiness. The problem I am having is starting to happen more often and can be quite embarrassing. 
She will develop a chronic misfire that is completely cured (until next time) by turning the ignition off and restarting the engine! 
I have changed the two fuel pump relays, it looks like the ignition module, rotor arm, cap and leads have been changed in recent times. It happens however full the tank is.
Please help me, if this happens when pulling out of a junction, overtaking etc it could be quite dangerous!
Regards, Robin.
She will develop a chronic misfire that is completely cured (until next time) by turning the ignition off and restarting the engine! I have changed the two fuel pump relays, it looks like the ignition module, rotor arm, cap and leads have been changed in recent times. It happens however full the tank is.
Please help me, if this happens when pulling out of a junction, overtaking etc it could be quite dangerous!
Regards, Robin.
Just a thought, could it be the carbon canister playing up? I seem to remember being told it only purges at high revs, if thats not behaving it could cause a misfire
Also just becasue something is new, doesnt mean it works! Have the spark plug extentions been replaced?
Does it happen at high or low revs? Just thinking that if its low reves, but clears at high revs you might have a lambda sensor down, the only ways to tell are to measure the voltages coming off or plug in a fault code reader. The full ECU test schedule can be found here www.rangie.com/articles_topic.php?id=167&cat=7&subCat=51
Regards
Iain
Also just becasue something is new, doesnt mean it works! Have the spark plug extentions been replaced?
Does it happen at high or low revs? Just thinking that if its low reves, but clears at high revs you might have a lambda sensor down, the only ways to tell are to measure the voltages coming off or plug in a fault code reader. The full ECU test schedule can be found here www.rangie.com/articles_topic.php?id=167&cat=7&subCat=51
Regards
Iain
chassis 33 said:
Just a thought, could it be the carbon canister playing up? I seem to remember being told it only purges at high revs, if thats not behaving it could cause a misfire
Regards
Iain
Regards
Iain
This makes sense as I had just filled it to the brim and it is much worse than normal! Will loosen cap to test. BTW is it normal to take 3-4 mins to fill up?
Regards, Robin
Still does the same with the fuel filler cap loose!
Have lagged the heater hoses with pipe lagging and it happens with the engine below full operational temperature!
Had a new Lambda sensor for MOT a month ago and the other was tested as OK.
Anymore ideas, have emailed the guy with the ECU tester.
Regards, Robin
Have lagged the heater hoses with pipe lagging and it happens with the engine below full operational temperature!
Had a new Lambda sensor for MOT a month ago and the other was tested as OK.
Anymore ideas, have emailed the guy with the ECU tester.
Regards, Robin
Something wrong. Get an expert to sort it out, it'll be cheaper and less painful in the long run than guessing and trying to track it down by trial and error, maybe breaking other things along the way. For every good suggestion you get here that matches your symptoms, there are probably half a dozen others that produce similar symptoms. Really the only way to sort it out is to methodically work through the system seeing what's working normally and what isn't. No offense, but if you were in a position to do that I don't think you'd be here asking for ideas.
GreenV8S said:
Something wrong. Get an expert to sort it out, it'll be cheaper and less painful in the long run than guessing and trying to track it down by trial and error, maybe breaking other things along the way. For every good suggestion you get here that matches your symptoms, there are probably half a dozen others that produce similar symptoms. Really the only way to sort it out is to methodically work through the system seeing what's working normally and what isn't. No offense, but if you were in a position to do that I don't think you'd be here asking for ideas.
Thanks Peter, that’s the spirit. I am a qualified Motor Vehicle Technician although I haven’t worked as a mechanic for 19 years and I have a degree in electronics. I have a fundamental problem taking my car to “the experts” as I haven’t had to resort to using a garage to fix my car ever! I can and will go through everything step by step as you suggest but I am sure the kind people on Pistonheads don’t mind pointing me in the right direction to avoid checking absolutely everything. I, in return help whenever a subject comes up that I have personal knowledge of. That is the point of a forum is it not?
Kindest regards, Robin.
TVRobin said:
Thanks Peter, that’s the spirit. I am a qualified Motor Vehicle Technician although I haven’t worked as a mechanic for 19 years and I have a degree in electronics. I have a fundamental problem taking my car to “the experts” as I haven’t had to resort to using a garage to fix my car ever! I can and will go through everything step by step as you suggest but I am sure the kind people on Pistonheads don’t mind pointing me in the right direction to avoid checking absolutely everything. I, in return help whenever a subject comes up that I have personal knowledge of. That is the point of a forum is it not?
Kindest regards, Robin.
Kindest regards, Robin.
I guess that's sarcasm. I try to help where I can, but sometimes the best advice is not to fiddle with it. With your background you probably know what a bad idea it is for people who don't know what they're doing, to try to solve problems by changing things at random. From the sound of it you're actually well qualified to tackle the problem. To start with it would be very helpful to know whether it is a fuel or ignition problem and which cylinders are being affected.
Edited by GreenV8S on Friday 1st September 01:21
Thank you Peter, I am getting an ECU tester that will tell me if any fault codes have come up and therefore if any component is causing problems. I can’t imagine anything else that can be cured by turning the ignition off! I hope then I will be in a position to get my new pride and joy working again.
Do you know what though? If I hadn't asked the good Pistonheaders I wouldn't have known that I could have rented an ECU tester for £10 a week. What is even more special is that I enclose a cheque when I return it,(thank you Richard). I love Pistonheads.
Kindest regards, Robin
Do you know what though? If I hadn't asked the good Pistonheaders I wouldn't have known that I could have rented an ECU tester for £10 a week. What is even more special is that I enclose a cheque when I return it,(thank you Richard). I love Pistonheads.
Kindest regards, Robin
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