Long version: skip below for the question.
Late last year I did the intake manifold gasket. Couldn’t start afterwards and chased it down to crank sensor, the plug was left in the coolant drain bucket and the sensor itself was bad. Cleaned it off, sprayed it good with contact cleaner and had a couple hiccups where unplugging and re-plugging that connection got me running right. Replaced: ICM, coil, distributor (broke on the 30th reinstall), spider upgrade, plugs and wires. Mostly Delco parts (tho the new plugs are .040 instead of .060).
In December the transmission wasn’t acting right. Had the filter/fluid change done but the truck still didn’t like high rpms in 3rd and shook violently. Threw no codes. Lately it started shaking at 60. Back off or speed up and mostly ok. Got new tires (mine were dry rotted). Ran premium gas with B12 cleaner in the tank.
Got a cheap scanner and started monitoring closer. It was misfiring at 60ish then moved up to 70 (60 now good). P0300 and P0305 if I left it in the angry zone long enough. Several hundred times according to scanner, felt like I was driving on square tires. Wires are tight on plugs and cap.
Yesterday the crank sensor connector (harness not sensor) finally gave out. In the space of 10 miles I had to get under and jiggle the wires 3 times until I could hear the fuel pump. Got a new plug I’ve been waiting on nicer weather to install and spliced it in. It’s a hack job I did in a Walmart parking in 40degree rain. But it runs again, will clean it up soon. Truck runs nice but still misfires at highway speed. 70 is now OK, 75+ still angry.
Ran the gas down, added Seafom at around 10gals remaining.Ran that as low as I dared but no misfire now. Refilled and still good. Double checked air filter connections and hit that reset button (WTF IS THAT GUY??) on the little valve.
Questions/theory:
The transmission issue when gunning on the highway seems to have been fuel/ignition related. Outside temps have not changed significantly.
Bad gas? Fouled injector?
Late last year I did the intake manifold gasket. Couldn’t start afterwards and chased it down to crank sensor, the plug was left in the coolant drain bucket and the sensor itself was bad. Cleaned it off, sprayed it good with contact cleaner and had a couple hiccups where unplugging and re-plugging that connection got me running right. Replaced: ICM, coil, distributor (broke on the 30th reinstall), spider upgrade, plugs and wires. Mostly Delco parts (tho the new plugs are .040 instead of .060).
In December the transmission wasn’t acting right. Had the filter/fluid change done but the truck still didn’t like high rpms in 3rd and shook violently. Threw no codes. Lately it started shaking at 60. Back off or speed up and mostly ok. Got new tires (mine were dry rotted). Ran premium gas with B12 cleaner in the tank.
Got a cheap scanner and started monitoring closer. It was misfiring at 60ish then moved up to 70 (60 now good). P0300 and P0305 if I left it in the angry zone long enough. Several hundred times according to scanner, felt like I was driving on square tires. Wires are tight on plugs and cap.
Yesterday the crank sensor connector (harness not sensor) finally gave out. In the space of 10 miles I had to get under and jiggle the wires 3 times until I could hear the fuel pump. Got a new plug I’ve been waiting on nicer weather to install and spliced it in. It’s a hack job I did in a Walmart parking in 40degree rain. But it runs again, will clean it up soon. Truck runs nice but still misfires at highway speed. 70 is now OK, 75+ still angry.
Ran the gas down, added Seafom at around 10gals remaining.Ran that as low as I dared but no misfire now. Refilled and still good. Double checked air filter connections and hit that reset button (WTF IS THAT GUY??) on the little valve.
Questions/theory:
The transmission issue when gunning on the highway seems to have been fuel/ignition related. Outside temps have not changed significantly.
Bad gas? Fouled injector?
