FridgeFreezer Posted January 21, 2009 Share Posted January 21, 2009 I've recently noticed a slight misfire, literally like one cylinder just misses a single beat when pulling away/changing gear and when, for example, driving along steadily around the 1500-2000rpm range on light throttle, where it will cough once every few seconds-ish. Under hard acceleration, cruising, or deceleration it's either not there or not noticeable. Pulling away it's almost like a clutch judder, I thought it was until it did it going along as well. I'm suspecting the ignition but not knowing a lot about the FL lumps does anyone have a pointer as to what's likely to be the culprit? It's the early engine with a distributor and single coil. Oh and before anyone says it, no it's not using coolant etc. etc. - the lump itself was brand new less than 10k ago, with the pukka head gasket and stat relocation kit fitted. Quote Link to comment Share on other sites More sharing options...
oddballrovers Posted January 21, 2009 Share Posted January 21, 2009 I've recently noticed a slight misfire, literally like one cylinder just misses a single beat when pulling away/changing gear and when, for example, driving along steadily around the 1500-2000rpm range on light throttle, where it will cough once every few seconds-ish. Under hard acceleration, cruising, or deceleration it's either not there or not noticeable. Pulling away it's almost like a clutch judder, I thought it was until it did it going along as well.I'm suspecting the ignition but not knowing a lot about the FL lumps does anyone have a pointer as to what's likely to be the culprit? It's the early engine with a distributor and single coil. Oh and before anyone says it, no it's not using coolant etc. etc. - the lump itself was brand new less than 10k ago, with the pukka head gasket and stat relocation kit fitted. Hi John If I understand it right, it is only under light/medium load so it is when the lamda sensor does it influense rigth! It does sound like running lean, check for that. Regards Ole. Ps why is it not MS'ed yet Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted January 21, 2009 Share Posted January 21, 2009 Measure the resistance of the rotor arm - if its more than 1k ohms replace it with a new LR one. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 21, 2009 Author Share Posted January 21, 2009 Measure the resistance of the rotor arm - if its more than 1k ohms replace it with a new LR one. Ta - Is that measured from the centre to the tip of the arm, or across the HT terminals on the cap? Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted January 21, 2009 Share Posted January 21, 2009 Centre out to the tip of the arm. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2009 Author Share Posted January 22, 2009 Well it's now developed into a total "not starting at all" sort of situation that's what happens when you wash a car Quote Link to comment Share on other sites More sharing options...
Dave W Posted January 22, 2009 Share Posted January 22, 2009 Megasquirt it, you KNOW you want to... go on, go on, go on.... Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2009 Author Share Posted January 22, 2009 Megasquirt it, you KNOW you want to... go on, go on, go on.... I know - it's only the alarm system stopping me and I may have a lead on that... Quote Link to comment Share on other sites More sharing options...
oddballrovers Posted January 22, 2009 Share Posted January 22, 2009 I know - it's only the alarm system stopping me and I may have a lead on that... Hi John Know this is OT but re MS is the od flywheel pattern solved?? Regards Ole. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2009 Author Share Posted January 22, 2009 Know this is OT but re MS is the od flywheel pattern solved?? I believe so. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 22, 2009 Author Share Posted January 22, 2009 Just been out and tried again after reading a few posts about locking/unlocking sometimes curing it. That wasn't the problem, but I think I've found what is. AllyV8 was closest and may well be bang on but new bits on order for tomorrow now Here's the problem - to the main stealer first thing tomorrow mehtinks! Quote Link to comment Share on other sites More sharing options...
freeloader Posted January 28, 2009 Share Posted January 28, 2009 I've recently noticed a slight misfire, literally like one cylinder just misses a single beat when pulling away/changing gear and when, for example, driving along steadily around the 1500-2000rpm range on light throttle, where it will cough once every few seconds-ish. Under hard acceleration, cruising, or deceleration it's either not there or not noticeable. Pulling away it's almost like a clutch judder, I thought it was until it did it going along as well.I'm suspecting the ignition but not knowing a lot about the FL lumps does anyone have a pointer as to what's likely to be the culprit? It's the early engine with a distributor and single coil. Oh and before anyone says it, no it's not using coolant etc. etc. - the lump itself was brand new less than 10k ago, with the pukka head gasket and stat relocation kit fitted. Hi I had a simular sort of issue with my F/lander, I changed the usual suspects, plugs , leads , rotor etc etc and it would be ok for a couple of days then it'd come back and got slowly worse, in the end it was the fuel pump. as you need to clean the filter every now and then 50K or so. (which is in the tank on the pump). take it to an auto eletrical place get them to check, even if they test drive with laptop plugged in, so that miss fire is detected. (as a pump could cost £100+) hope you get it sorted Quote Link to comment Share on other sites More sharing options...
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