Bad coil pack?

[yellow90tsi]

Is it possible to have good resistance for the secondary test and then none for the primary? And does this make the coil pack a bad one? Im thinking yes it does but not 100% sure. Also for checking primary, what do i need my multimeter set on
20m
2m
200k
20k
2k
200
Any help is appreciated thanks guys.

 

[luv2rallye]

Set meter to lowest scale (200) to read primary. It's spec'd at 0.86 ohms so anything between 0.76 and 0.96 should be ok. Of course some meters can't read this low and might read 0. The secondary is spec'd at 12.1k (12,100 ohms) so meter should be on the 20k scale (and +/- 1k is acceptable). If readings aren't in this range your coil is bad. But even if they are in the proper range it doesn't guarantee your coil is ok. It could still be weak or fail with temperature. If readings are ok but you still suspect the coil, look at the spark strength it produces on the spark plug (Pull plug, reconnect cable, clamp plug casing to ground, crank and watch spark).

 

[yellow90tsi]

Yeah my secondaries spec'd at between 1&4 at 13,240 and the between 2&3 13,000 on the 20k setting, i set it to 200 and i got .9 and a 1.0. Im thinking the coil is good, but like u said once it gets some heat to it, u never know. Thanks.

 

[luv2rallye]

Are you having a problem with the engine or just asking for info? If you suspect the coil, you can heat it up with a heat gun or hair dryer and do the spark test I mentioned (compare to without heat). Usually weak coils break down with heat. Remember bad spark plug wires will also produce weak spark. And those wires get bad with age. The resistance of those should not exceed around 11k ohms. Bend them all over when you test to look for partially broken ones.

 

[yellow90tsi]

Just checking to see if the coil is good,I am switching from a 90 to 91-94 setup with my eprom, so before I tear down i want everything working. but from the looks of it, without buying a new multimeter i will just have to tear down, and deal with any problems i may come across. Thanks for ## time though.

 

[luv2rallye]

Just checking to see if the coil is good,I am switching from a 90 to 91-94 setup with my eprom

Well normally you have to get a 91-94 coil as well (http://www.ecanfix.com/users/mdhamilton/ecuconversion.html) athough this guy claims he has a way to use the 90 coil (http://www.dsmchips.com/1990ecu.html).

 

[DGK215]

how do you test the primary?

 

[DGK215]

bump?

 

[DGK215]

bump again

 

[doubleclutch]

There should be a connector with 3 pins in in smack dab in the middle of the top of your intake, next to the coil pack. You test the primary by going between the single pin on the one side of the green plastic divider and one of the two pins on the other side.

if you jump the wrong two pins you should get double the value of the right pins