Coil Pack Resistance

[aridgecko]

Hello to all - On my 2003 996 C4, all 6 of the coils read 0.9 to 1.0 ohms, I see this is outside the range, but because it was consistent across all 6, I thought in not a problem. What do you think. I am not able to idle at all in it's current state, but I do not know whether it is spark, fuel or something else.  It ran fine before I pulled the engine for IMS bearing upgrade, so the rough idle could certainly be as a result of something else I fouled up during the IMS repair, but at this time, simply wondering if 0.9 to 1.0 is unusual enough to be causing the engine not to idle.  Side note:  it will run OK between 2k and 3K rpm, but if I try to rev higher, it is being limited through some fail-safe means at exactly 4k rpm.

 

Thank you,

Randy

[JFP in PA]

Hello to all - On my 2003 996 C4, all 6 of the coils read 0.9 to 1.0 ohms, I see this is outside the range, but because it was consistent across all 6, I thought in not a problem. What do you think. I am not able to idle at all in it's current state, but I do not know whether it is spark, fuel or something else.  It ran fine before I pulled the engine for IMS bearing upgrade, so the rough idle could certainly be as a result of something else I fouled up during the IMS repair, but at this time, simply wondering if 0.9 to 1.0 is unusual enough to be causing the engine not to idle.  Side note:  it will run OK between 2k and 3K rpm, but if I try to rev higher, it is being limited through some fail-safe means at exactly 4k rpm.

 

Thank you,

Randy

 

Coil packs can read within resistance range and still break down with heat or under electrical load, causing a miss.  But being out of range is never a good indicator.

 

Did you run cam deviation values before and after the IMS retrofit?

[aridgecko]

JFP, Thank you for the reply.  I did not run the deviation, but I did lock in place and have subsequently checked and was able to insert the locking tool in place on both 1-3 and 4-6 after running the engine.  I have durametric reader on the way at this time....a little late I guess.

 

I failed to mention that I am not getting CEL nor any fault codes on my reader.

 

Thanks,

Randy

[Ahsai]

You can try to do the e-gas calibration first. Leave the key in the last position before cranking for 60s with foot off the gas pedal. Then turn key to OFF for 10s and it's done.