ignition coil problem (wierd)
#1
Bang Bang!
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ignition coil problem (wierd)
1994 fd3s
single turbo
all fuel upgrade
fmi
no a/c no p/s
new wires new plugs
ok so my car was fine and all of the sudden it started to ild rough and my a/f was lean at around 17.1:1 at idle.... all the fuel is ok.
so i was checking the plug wires and i pulled the top leading plug half way off the coil to see if it had spark and the car idled perfecr.... so i put the wre all the way back in the coil and it idle like crap...
so it will only idle good *normal* when the top wire from the leading coil is half way off...... anyone ever seen this?? im thinking about replacing that coil but want to make sure its bad before spending 120.00 on it.
any advice will be great.... also the coil bracket has good grounds i even aded one new on..
single turbo
all fuel upgrade
fmi
no a/c no p/s
new wires new plugs
ok so my car was fine and all of the sudden it started to ild rough and my a/f was lean at around 17.1:1 at idle.... all the fuel is ok.
so i was checking the plug wires and i pulled the top leading plug half way off the coil to see if it had spark and the car idled perfecr.... so i put the wre all the way back in the coil and it idle like crap...
so it will only idle good *normal* when the top wire from the leading coil is half way off...... anyone ever seen this?? im thinking about replacing that coil but want to make sure its bad before spending 120.00 on it.
any advice will be great.... also the coil bracket has good grounds i even aded one new on..
#6
Form follows function
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Pulling the wire off is acting as a booster gap. 1) I'd check or change the plugs, again; and, 2) take a closer look at the plug wires & connections if necessary. Your problem is not likely the coil--I'd put my money on a bad plug. Note that plugs and wires can look great and still malfunction. For that reason, you're best to sub them out with know good units, even if used. Been there, done that.
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#9
Bang Bang!
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Pulling the wire off is acting as a booster gap. 1) I'd check or change the plugs, again; and, 2) take a closer look at the plug wires & connections if necessary. Your problem is not likely the coil--I'd put my money on a bad plug. Note that plugs and wires can look great and still malfunction. For that reason, you're best to sub them out with know good units, even if used. Been there, done that.
#12
Racecar - Formula 2000
Booster-Gap Function
On the subject of booster-gap, there used to be plugs made with the booster gap (0.030" or so) internal to the plugs. The booster gap's purpose is to make the spark voltage build-up much more sudden, since the current has to jump the booster gap first, so that the plug will spark before fouling could bleed off the voltage. Booster-gap plugs were fairly common in the old days of poor oil control, lousy carburetors, and the resulting rapidly fouled plugs.
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