Something a little odd, what to look at first??
Discussion
Went out in the faithful beast today after it has sat for 5 or 6 weeks. Allowed everything to warm up properly, then a good steady run on the motorway and then off to my fave roads, all being well.
Then developed a strange issue. After giving it some beans for a period of decent road I then dropped down to lower speeed in traffic. At this point it began jumping as if it was missing, put the clutch down and the idle was all over the place, sometimes stalling. After 20 seconds or so all back to normal, could tickle around in the traffic no issues. However, each time after I gave it the beans again the same happened.
Any thoughts of what it could be/what I should look at first? Thought I'd get the plugs out tomorrow and see if they are sooty, perhaps over fueling for some reason?? Could the stepper motor cause this??
Look forward to any ideas
Cheers, David
Then developed a strange issue. After giving it some beans for a period of decent road I then dropped down to lower speeed in traffic. At this point it began jumping as if it was missing, put the clutch down and the idle was all over the place, sometimes stalling. After 20 seconds or so all back to normal, could tickle around in the traffic no issues. However, each time after I gave it the beans again the same happened.
Any thoughts of what it could be/what I should look at first? Thought I'd get the plugs out tomorrow and see if they are sooty, perhaps over fueling for some reason?? Could the stepper motor cause this??
Look forward to any ideas
Cheers, David
Sounds like fuel starvation to me. Lack of fuel in the tank? Fuel pump? Fuel pressure? Stepper motor is a possibility but would normaly play up during startup. Easy to check though. Just whip it out and clean and test it. What ever it is will most likely get worst and will then be easier to detect. In this case electrical sounds unlikely to me, unless it's something like fuel pump relay.
Tony.TCB.
Tony.TCB.
funnily enough i had the same problem, even ending in stalling and it was my ignition coil, just 2 years old lucas one had developed a spark jump. see if that has any sign of sparks jumping while the engine is idling as the insulation may have gone bad. you might be able to MacGyver it with some duct tape around the top.
Whip a plug out to check condition...Check the timing...I have to say that something similar was happening to me..It went on for a couple of months, Sometimes not happening at all...Then it happened...Fuel pump dies....I should of known when i saw erratic fuel pressure on the pressure gauge of the adjustable reg that i had on there a little while back..Might put that back on now..Definitely made a difference to performance through the rev range...Ziga
Thanks for the replies.
Plenty of fuel in the tank, in fact I put some exctra in just in case the gauge was telling porkies. Will check the plugs/stepper and now also the coil and see if anything obvious. If not I guess wait until it it develops a bit more.
Don't think it is timing as it is running well and pulling strong through the rev range all of the time - not missing at all during driving, this is happening for a few seconds after going into slow traffic after spirited driving.
Plenty of fuel in the tank, in fact I put some exctra in just in case the gauge was telling porkies. Will check the plugs/stepper and now also the coil and see if anything obvious. If not I guess wait until it it develops a bit more.
Don't think it is timing as it is running well and pulling strong through the rev range all of the time - not missing at all during driving, this is happening for a few seconds after going into slow traffic after spirited driving.
400SE Dave said:
Thanks for the replies.
Plenty of fuel in the tank, in fact I put some exctra in just in case the gauge was telling porkies. Will check the plugs/stepper and now also the coil and see if anything obvious. If not I guess wait until it it develops a bit more.
Don't think it is timing as it is running well and pulling strong through the rev range all of the time - not missing at all during driving, this is happening for a few seconds after going into slow traffic after spirited driving.
I am not sure about this suggestion, but I seem to vaguely remember there is a device fitted to the speedo cable on later V8 Wedges that signals the ECU when the engine is slowing down at traffic etc. As your problem sounds related, it may be worth looking into. Plenty of fuel in the tank, in fact I put some exctra in just in case the gauge was telling porkies. Will check the plugs/stepper and now also the coil and see if anything obvious. If not I guess wait until it it develops a bit more.
Don't think it is timing as it is running well and pulling strong through the rev range all of the time - not missing at all during driving, this is happening for a few seconds after going into slow traffic after spirited driving.
Tony.TCB.
Thanks again for everyone's input and just a quick update.
Took a plug out, looked as it should. Cleaned the stepper motor but to be honest didn't really need it. Then taking the suggestion about the coil, checked all the connections and that the leads were all in properly, all OK and then just because I checked those I did them same at the dizzy end. Found one was quite a lot higher and a little looser than the rest so pushed it back as the others.
Took it for a run, all seemed OK so went for a longer run and the same route as yesterday (any excuse
) at pretty much the same pace, dropped it off frequently as if stuck in traffic to replicate yesterday, and couldn't get it to repeat what it was doing. Did 30 or so miles and all seems good.
Could it be that simple?? Could I be that lucky??? Only real difference to yesterday was it was cooler today
Took a plug out, looked as it should. Cleaned the stepper motor but to be honest didn't really need it. Then taking the suggestion about the coil, checked all the connections and that the leads were all in properly, all OK and then just because I checked those I did them same at the dizzy end. Found one was quite a lot higher and a little looser than the rest so pushed it back as the others.
Took it for a run, all seemed OK so went for a longer run and the same route as yesterday (any excuse
) at pretty much the same pace, dropped it off frequently as if stuck in traffic to replicate yesterday, and couldn't get it to repeat what it was doing. Did 30 or so miles and all seems good.Could it be that simple?? Could I be that lucky
??? Only real difference to yesterday was it was cooler today Edited by 400SE Dave on Sunday 20th April 17:43
jon haines said:
it turned to be the thingy attached to the side of the dizzy
Ignition amp....Its also good to remove the dizzy cap and plastic cover and give it some electrical contact cleaner/Lubricant..Squirt some around the insides to help keep the weights lubed up...(ooo missus)...ZigaGassing Station | Wedges | Top of Page | What's New | My Stuff