79 C10 with LM7 issues
Thread Starter
Teching In
Joined: Mar 2014
Posts: 3
Likes: 0
From: Temple, TX
79 C10 with LM7 issues Hi all looking for my next step in this headache. I swapped a LM7 into my C10 back in February and it was running great up until about a month ago. Started running rough only code P0300 random misfire. AT first it was just cylinder 3 & 7 now all of bank 1 is dead i can disconnect the coil harness and it does not effect the engine. Below is the diagnosis steps i've taken so far.
swapped coils, plugs, and wires
checked for intake leaks with carb cleaner
checked compression all cylinders @ 150psi
swapped pre cat o2 sensors
removed valve cover bank 1 nothing stood out
swapped injectors
checked injector signal with noid light
check power to coils
checked spark with a spare plug
Everything checked out problem is not found yet. Next up is i'm trying to find an ECU to swap i'm at whits end. Anybody seen anything like this before? Thank You
swapped coils, plugs, and wires
checked for intake leaks with carb cleaner
checked compression all cylinders @ 150psi
swapped pre cat o2 sensors
removed valve cover bank 1 nothing stood out
swapped injectors
checked injector signal with noid light
check power to coils
checked spark with a spare plug
Everything checked out problem is not found yet. Next up is i'm trying to find an ECU to swap i'm at whits end. Anybody seen anything like this before? Thank You
Thread Starter
Teching In
Joined: Mar 2014
Posts: 3
Likes: 0
From: Temple, TX
Yes cat on each side i used the stock manifolds and cats from my '14 1LE they were essentially new when put on as i put LTs on as soon as i got my camaro. after each cat is just a dump, its easy enough to remove the cat i can give it a try or i might be able to get a backpressure gauge from work
