Graham Piccinini
Thread starter
CEL came on, for misfire on cylinders 1 & 4. Yet while driving power was same, no extra vibrations, all smooth. Weird, I'm usually pretty good at spotting a misfire before it even causes a CEL, but not on this FIAT.
Figured I'll give it new plugs to start with. NGKs weren't locally available, so I went with Autolite Iridium's. Here is where it got weird...
Spark plugs on 1 & 4 were properly tight and looked good when removed. But spark plugs on 2 & 3 gave me quite a fight. Both felt seized in head. When removing I did the "loosen-loosen-tighten" pattern in 1/4 turn increments for the full length of that thread. It honestly felt like I'm about to have a case of Ford Modular with stripped threads and helicoil inserts...
Took a while, but they came out thankfully. Both looked more rich than the outside cylinders.
Threw new Autolite plugs with anti seize on threads and dielectric grease on the ignition coil end. It's been three weeks, so far so good.
On my past cars it was always the ignition coils, and new plugs rarely helped. But thankfully here the plugs fixed the CELs. I'm still confused on how the codes were present, but engine ran smooth & proper.
Figured I'll give it new plugs to start with. NGKs weren't locally available, so I went with Autolite Iridium's. Here is where it got weird...
Spark plugs on 1 & 4 were properly tight and looked good when removed. But spark plugs on 2 & 3 gave me quite a fight. Both felt seized in head. When removing I did the "loosen-loosen-tighten" pattern in 1/4 turn increments for the full length of that thread. It honestly felt like I'm about to have a case of Ford Modular with stripped threads and helicoil inserts...
Took a while, but they came out thankfully. Both looked more rich than the outside cylinders.
Threw new Autolite plugs with anti seize on threads and dielectric grease on the ignition coil end. It's been three weeks, so far so good.
On my past cars it was always the ignition coils, and new plugs rarely helped. But thankfully here the plugs fixed the CELs. I'm still confused on how the codes were present, but engine ran smooth & proper.