Jerking motion under light load??! please help
Discussion
So I've just had a new radiator fitted and all seems well there...
But the original problem it went to the garage for was the idling problem (coasting up to lights etc. it would fluctuate between 3-400 and 1000rpm).
I thought it was an LPG issue but the garage thought not (leading me to think they were just blaming the car rather than their lpg installation)...
...any way, not diagnosed it yet but suffice to say it's definitely not LPG specific... I've driven it on petrol only today and it's now very jerky under very light throttle (not related to revs, but throttle position i think)
Anyone had similar or any ideas as to what this might be? check engine light comes on and beeps at me (quite a bit!)
Sticky throttle body maybe? could it be a misfire? I'm scared to drive it now in case i damage something!
Thanks in advance for any suggestions.
But the original problem it went to the garage for was the idling problem (coasting up to lights etc. it would fluctuate between 3-400 and 1000rpm).
I thought it was an LPG issue but the garage thought not (leading me to think they were just blaming the car rather than their lpg installation)...
...any way, not diagnosed it yet but suffice to say it's definitely not LPG specific... I've driven it on petrol only today and it's now very jerky under very light throttle (not related to revs, but throttle position i think)
Anyone had similar or any ideas as to what this might be? check engine light comes on and beeps at me (quite a bit!)
Sticky throttle body maybe? could it be a misfire? I'm scared to drive it now in case i damage something!
Thanks in advance for any suggestions.
I did try this:
http://www.ebay.com/itm/WiFi-Bluetooth-ELM327-Auto...
...with the Torque OBD app for android but it doesn't seem to come up with anything? (I maybe have it set up wrong?!) Sounds like some guys on here have used it and found that it works though? :S
http://www.ebay.com/itm/WiFi-Bluetooth-ELM327-Auto...
...with the Torque OBD app for android but it doesn't seem to come up with anything? (I maybe have it set up wrong?!) Sounds like some guys on here have used it and found that it works though? :S
So.. had a look today (as much as i could get at... some of the LPG kit gets in the way of the engine cover which i imagine is because they couldn't fit it underneath and I didn't wanna mess with it)
looks like the pulley near the MAF sensor has been rubbing on one of the connectors! so probably a bad connection there... could that be the reason? i imagine I'm not the only one this has happened to? (it looks like one of the wires from the 3 pin connector has been disconnected)
managed to get a look inside the TB, looks pretty clean, can't see any evidence to suggest it as the cause... then again i couldn't get access to remove it and have a proper look (and I have very little exp here!).
Still can't get any sense out of the OBD app either...
looks like the pulley near the MAF sensor has been rubbing on one of the connectors! so probably a bad connection there... could that be the reason? i imagine I'm not the only one this has happened to? (it looks like one of the wires from the 3 pin connector has been disconnected)
managed to get a look inside the TB, looks pretty clean, can't see any evidence to suggest it as the cause... then again i couldn't get access to remove it and have a proper look (and I have very little exp here!).
Still can't get any sense out of the OBD app either...
I took her out for a little spin a couple of hours ago and she seemed to behave (idling ok/no jerkyness)... but the light still came on... and I'm not sure that all of the power was there when i booted it...
That pulley had definitely been chewing on the connector though... wires exposed... one looked like it was completely severed... surely there's a good chance that's the cause? (or is it just a red herring?)
I feel like all I do on here is post problems! I'm such a leech! (apologies for that
)
Hopefully I'll be able to help someone else out soon!
That pulley had definitely been chewing on the connector though... wires exposed... one looked like it was completely severed... surely there's a good chance that's the cause? (or is it just a red herring?)
I feel like all I do on here is post problems! I'm such a leech! (apologies for that
)Hopefully I'll be able to help someone else out soon!
stigmundfreud said:
Stu without meaning to sound insulting (not that it ever really stops me) if you have a CEL light on wtf are you doing booting it? I mean seriously I never understand why when people have CEL's they drive them as normal up until the thread "how much is an engine rebuild"
Stu, the cars f
ked, that light is telling you to drive careful, drive very short distance and get it to someone that can read the codes. As you are in South Yorkshire your official dealership is limited to fk all so you need a code reader or someone that can read the codes for you - such as the AA or RAC if you have home start get them out to diagnose it. Or you can pay an autospark to read most codes.
Duly noted. Will get it read pronto.Stu, the cars f
ked, that light is telling you to drive careful, drive very short distance and get it to someone that can read the codes. As you are in South Yorkshire your official dealership is limited to fk all so you need a code reader or someone that can read the codes for you - such as the AA or RAC if you have home start get them out to diagnose it. Or you can pay an autospark to read most codes.
Behold81 said:
Are you checking while the light is on??? Som errors don't log as the clear themselves. Check with torque while the light is on. If that's not picking it then a better reader is needed.
As to the wire can to trace it to another end to test continuity?
Yeah. I started it up, light came on, then scanned and nothing came up... so there's a bit of miscommunication there.As to the wire can to trace it to another end to test continuity?
looks like some proper equipment is required!
Yep. 28 (I presume that puts me at the young end of the bracket?). That's probably why I don't have my own soldering iron yet!
The garage that I took it to said that they couldn't read the codes and therefore weren't sure what was wrong!! So after loosing all faith in their ability and taking a couple of bits off myself to have a look at what was actually happening (rather than just expecting a computer to tell me) I immediately noticed the obvious 'pulley eating the connector issue'... but I suppose i was just being a pessimist in that I couldn't be absolutely sure that was the issue (even though there was a pretty strong chance it was!) until I had fixed it... hence me badgering you lot for some reassuring 'yeah, that'll be it mate- get cracking' type comments while I was stuck at work with my mind wandering!
Like I keep saying though, I'm still looking forward to attending my first meet and putting some faces to names
The garage that I took it to said that they couldn't read the codes and therefore weren't sure what was wrong!! So after loosing all faith in their ability and taking a couple of bits off myself to have a look at what was actually happening (rather than just expecting a computer to tell me) I immediately noticed the obvious 'pulley eating the connector issue'... but I suppose i was just being a pessimist in that I couldn't be absolutely sure that was the issue (even though there was a pretty strong chance it was!) until I had fixed it... hence me badgering you lot for some reassuring 'yeah, that'll be it mate- get cracking' type comments while I was stuck at work with my mind wandering!
Like I keep saying though, I'm still looking forward to attending my first meet and putting some faces to names
blue666uk said:
Just a note as a fellow LPG supporter - and knowing there is often a fair amount of hostility towards it - as long as the installation is sound, there should be no issues going forward.
Early days with my CV8, I had stuttering, and very low rev's pulling up to junctions/slowing down/stopping etc, sometimes causing it to stall. We took the throttle body apart, it looked clean, but it is deceptive how dirty a 'clean' looking component can be. Some cleaner and much wiping and the cloth was black, I didn't realise you should be able to see a reflection in clean metal
This partially cured the problem, but it was still intermittent. Something else to check if it still comes up occasionally, is spark plugs and HT leads. These need to be tip top for LPG - turns out mine were past their best, the sparks were at 50+K miles and the leads presumably the same. New plugs and leads (the leads disintegrated trying to get them off) and not had a running issue since apart from running slightly rich on petrol but that's more to do with a recent map and further mods that now needs sorting out.
To be fair to the garage, I think they have done a solid job with the LPG. It's been absolutely rock solid since it was done. I did initially think they were just blaming the car to get out doing any work for free but as we now know, this issue had nothing to do with the LPG install.Early days with my CV8, I had stuttering, and very low rev's pulling up to junctions/slowing down/stopping etc, sometimes causing it to stall. We took the throttle body apart, it looked clean, but it is deceptive how dirty a 'clean' looking component can be. Some cleaner and much wiping and the cloth was black, I didn't realise you should be able to see a reflection in clean metal
This partially cured the problem, but it was still intermittent. Something else to check if it still comes up occasionally, is spark plugs and HT leads. These need to be tip top for LPG - turns out mine were past their best, the sparks were at 50+K miles and the leads presumably the same. New plugs and leads (the leads disintegrated trying to get them off) and not had a running issue since apart from running slightly rich on petrol but that's more to do with a recent map and further mods that now needs sorting out.
I'll bear that in mind with regards to the sparks etc... I think they were changed at some point in its history but will have to check how far back (she's done 73k now).
thanks blue
stigmundfreud said:
I'd missed the frayed wire, that's a solid job that is also didn't they say there was nowt wrong with the install? Top work, is the mechanic called Mark?
I'm afraid you may have lost me there mate!The LPG was done a while ago now, without a single issue. I've deduced that the frayed wire was as a result of the airbox/MAF sensor connection becoming a bit dislodged I think... now that I've put it back together properly the wires are well clear of the pulley. As to how it became dislodged in the first place I'm not sure (I suppose there's a chance it could have even been me when I swapped the air box out) In any case, it's sorted now and she's running just fine. It felt good to stretch her legs the other day!
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