DOG_MORGAN Posted April 28, 2012 Report Share Posted April 28, 2012 got a tr6 pi 1972 which has got a misfire on no 1+2 CYL GOT GOOD COMP ON CYLS GOOD SPARK GAN ANY ONE HELP PLEASE BILLY THANKS Quote Link to post Share on other sites
PJM Posted April 28, 2012 Report Share Posted April 28, 2012 Rotor arm, ht leads, dizzy cap, coil, dirt/water around plugs or any of the usual suspects. Quote Link to post Share on other sites
DOG_MORGAN Posted April 29, 2012 Author Report Share Posted April 29, 2012 All have been replaced I have changed the M/ unit all with no success. Do you think it good be the head gasket. Many thank Billy Quote Link to post Share on other sites
Davidw Posted April 29, 2012 Report Share Posted April 29, 2012 Any salad cream in the filler cap, radiator or dipstick tube? If so then yes it's the head gasket. If not, can you get hold of a compression tester? Quote Link to post Share on other sites
Peter Cobbold Posted April 29, 2012 Report Share Posted April 29, 2012 Injectors? Fuel pressure? Check to see if pulses are healthy Quote Link to post Share on other sites
DOG_MORGAN Posted April 29, 2012 Author Report Share Posted April 29, 2012 no cream in filler cap comp test is 160 which is good on both on cyls Quote Link to post Share on other sites
DOG_MORGAN Posted April 29, 2012 Author Report Share Posted April 29, 2012 good pressure on fuel line new injectors thanks billy Quote Link to post Share on other sites
Mike G Posted April 29, 2012 Report Share Posted April 29, 2012 Try swapping all the bits off No 1&2 cylinders to any of the other 4 and see if misfire migrates. Â Mike G Quote Link to post Share on other sites
Andrew Smith Posted April 29, 2012 Report Share Posted April 29, 2012 got a tr6 pi 1972 which has got a misfire on no 1+2 CYL GOT GOOD COMP ON CYLS GOOD SPARK GAN ANY ONE HELP PLEASE Â Billy, Â How do you know it's 1 & 2? Â Cheers Andrew Quote Link to post Share on other sites
DOG_MORGAN Posted April 29, 2012 Author Report Share Posted April 29, 2012 number 1&2 both not firing have done all the usual checks fuel spark ect cheers Bill Quote Link to post Share on other sites
racey Posted April 29, 2012 Report Share Posted April 29, 2012 Billy I had a similar problem when I rebuilt my '73 CR. When I refitted the engine I treated it to a new rotor arm and cap but could not get it to fun correctly even with all the checks you have completed - good spark etc. Eventually replaced the new cap with an old cap found gathering dust in my garage and hey presto! ran like a dream?? I checked the new cap for any defects and continuity - all checked out OK, just wouldn't do what it said on the tin! Worth a try? Graham Quote Link to post Share on other sites
Peter Cobbold Posted April 29, 2012 Report Share Posted April 29, 2012 number 1&2 both not firing have done all the usual checks fuel spark ect cheers Bill  Do you mean there is no spark on 1 and 2? - or that 1 and 2 do have sparks but are nonetheless not firing? Quote Link to post Share on other sites
Guest ntc Posted April 29, 2012 Report Share Posted April 29, 2012 Billy I had a similar problem when I rebuilt my '73 CR. When I refitted the engine I treated it to a new rotor arm and cap but could not get it to fun correctly even with all the checks you have completed - good spark etc. Eventually replaced the new cap with an old cap found gathering dust in my garage and hey presto! ran like a dream?? I checked the new cap for any defects and continuity - all checked out OK, just wouldn't do what it said on the tin! Worth a try? Graham   Defo good idea Quote Link to post Share on other sites
scorpio Posted April 29, 2012 Report Share Posted April 29, 2012 I had a similar problem last year, turned out to br the leads. Try running your engine at night, with the bonnet open, I could see flashing up and down my leads where the broke down. Worth a try? Steve Quote Link to post Share on other sites
DOG_MORGAN Posted April 29, 2012 Author Report Share Posted April 29, 2012 got a good spark on 1&2 cyl all parts are new leads plugs dissy cap rotor arm last thing is it head gasket billy Quote Link to post Share on other sites
paultr4-6 Posted April 29, 2012 Report Share Posted April 29, 2012 Hi Billy What about the valves? You never no might have a sticky one. Regards Paul Quote Link to post Share on other sites
Peter Cobbold Posted April 29, 2012 Report Share Posted April 29, 2012 If you have spark and compression it has to be fuel, or air. Do the injector hoses 'pulse'? injectors, even new, can block and stop pulsing. Compare 1 or 2 with the others. Are the front two butterflies opening? Â Head gasket are very reliable and you'd be loosing water down the overflow into the catch bottle if jacket pressurising. Quote Link to post Share on other sites
marko Posted April 29, 2012 Report Share Posted April 29, 2012 I would say its unlikely to be the headgasket - especially if you've changed all the electrical bits - more likely to be a faulty "new" rotor arm, dizzy cap or lead.... Â If not, has the Metering unit timing been checked? Are the injector pipes pulsing / ticking if you squeeze them between your thumb and forefinger....?? Â Also check the fuel pressure - any drop below 105 PSI can cause problems / mis-fire... Quote Link to post Share on other sites
DIYBOSSCAT Posted April 29, 2012 Report Share Posted April 29, 2012 Bill, stupid question, the leads are on the cap in the right order aren't they - 1,5,3,6,2,4? 1 and 2 swapped over? Â Vince. Quote Link to post Share on other sites
marko Posted April 29, 2012 Report Share Posted April 29, 2012 That's a good point vince and easily done Quote Link to post Share on other sites
DOG_MORGAN Posted April 30, 2012 Author Report Share Posted April 30, 2012 plugs&leads are in the fireing order thanks biily Quote Link to post Share on other sites
DOG_MORGAN Posted May 3, 2012 Author Report Share Posted May 3, 2012 Thanks to all members who responded to my request for help regarding my misfire. I have now replaced the dizzy cap leads and plugs now firing on all 6 cylinders. the first time it has run in 25years as a complete car Thanks Bill Quote Link to post Share on other sites
Chris Porter Posted May 4, 2012 Report Share Posted May 4, 2012 I'm currently suffering rough running and misfires. On removing the dis cap the little central button fell out. New dis cap, points, condenser and coil have not produced a cure. Two new rotor arms from Moss both snapped, for some reason (no I don't fit them with a hammer!) so now back to the original. Will get a red (?) one next as supposed to be better - though not sure why. Â Timing OK, plug leads in right sequence. About to check fuel side but plugs all look a bit oily after idling. Â Any more ideas much appreciated. Â Chris Porter Quote Link to post Share on other sites
Peter Cobbold Posted May 4, 2012 Report Share Posted May 4, 2012 Chris Try new plugs - the misfiring wont have helped the old ones. Also look in the dark for stray sparks on leads. Petrol is not left over from last year? Suspect the PI last! Peter Quote Link to post Share on other sites
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