richwill
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| posted on 14/12/13 at 04:45 PM |
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Engine misfire under load
I have been having trouble getting my engine to run correctly. (Pinto injection 2.0)
The engine misfires under acceleration.
I haven't had it running for a couple of months and have also repaired the exhaust recently after it broke on the weld between the collector and
down pipe. While investigating the trouble I found the coil lead was loose and sparking. I replaced this and all the other leads and distributer cap
but don't seem to have solved the trouble.
I thought this at first had solved the problem however when I took it out today it still misfired under load.
Any suggestions as to what to try next.
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ian locostzx9rc2
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| posted on 14/12/13 at 04:59 PM |
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Spark plugs,rotor arm, old fuel ,blocked jets in carb? Though you had checked coil tower that's worth checking it was sparking on the ht lead
[Edited on 14/12/13 by ian locostzx9rc2]
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britishtrident
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| posted on 14/12/13 at 05:01 PM |
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Plugs
A crack in the coil ht insulation is also a possible cause.
Then check valve clearances and do a compression test
[Edited on 14/12/13 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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richwill
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| posted on 14/12/13 at 05:18 PM |
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I have a new set of plugs so will fit them and I think I may have another coil so will also try that.
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GonzoRacer
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| posted on 15/12/13 at 02:01 PM |
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If it only misfires under a load, you might check the base timing and the spark advance. You mention a distributor, does it have an "old
fashioned" vacuum advance? Might check the vac line on that.
"And it wasn't even a full moon."
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britishtrident
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| posted on 15/12/13 at 02:36 PM |
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quote:
Originally posted by GonzoRacer
If it only misfires under a load, you might check the base timing and the spark advance. You mention a distributor, does it have an "old
fashioned" vacuum advance? Might check the vac line on that.
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[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Oddified
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| posted on 15/12/13 at 02:54 PM |
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Had that on a pinto many years ago. Found to be the ht coil breaking down, ran ok at idle and cruising, but not enough spark to ignite the fuel under
load.
Ian
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Nickp
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| posted on 15/12/13 at 03:01 PM |
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Blocked fuel filter? Allows enough fuel through for tickover and light load but not heavy load?
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richwill
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| posted on 15/12/13 at 04:37 PM |
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Changed the leads,plugs coil and also discovered a fuel leak which I fixed hopefully this has sorted it. Old plugs were very sooty which I think
indicates that it's running rich? I will have to see if I can adjust this but not sure how? Can't test it though as it's chucking it
down.
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britishtrident
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| posted on 15/12/13 at 05:57 PM |
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quote:
Originally posted by richwill
Changed the leads,plugs coil and also discovered a fuel leak which I fixed hopefully this has sorted it. Old plugs were very sooty which I think
indicates that it's running rich? I will have to see if I can adjust this but not sure how? Can't test it though as it's chucking it
down.
Running rich with injection system often points to the coolant temperature sensor or a fault in the associated wiring.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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