Engine Ticking

[RICHARD TILL]

I replaced my coils with MSD`S last year due to no spark on #3 cylinder only. A month later i was pulling the plenum again. I`ll never pull it again without cleaning the contacts inside the starter solenoid.

[Dynomite]

Originally Posted by RICHARD TILL

I`ll never pull it again without cleaning the contacts inside the starter solenoid.

Great suggestion
Starter Rebuild

......and I might add........Never pull the Plenum without blocking TB Coolant at the Injector Housing

To accomplish that without removing the Injector Housings would require the removal of the Injector Housing Coolant Manifolds (use heat on those stubborn Coolant Manifold Bolts heating the Coolant Manifolds/Injector Housing in the area of each bolt). The Coolant Manifolds are removed to make sure you keep out aluminum shavings that may drop into each Injector Housing Coolant Port during installing of the TB Coolant Port threaded 1/8 inch pipe plug.

Injector Housing TB Coolant Blocking

[Paul Workman]

Originally Posted by Dynomite

*...To accomplish that without removing the Injector Housings would require the removal of the Injector Housing Coolant Manifolds...*

Hmmm..... Cliff, I'm scratchin' my head, trying to think of why drilling/tapping the TB passages would require removing the coolant tubes (mounted on each side of the motor). I don't believe I did, but I've slept since then and may have forgotten. I did mask off the rest of the holes in the IH, of course, and was careful of filings, but a tiny filing or two in the coolant jacket would be no big deal, no?

[Dmod81]

OK, so I checked resistance of wire pairs, no differences there, all around 20k Ohms. Tested spark on #6 and #1, no spark on 6, spark on 1- but it might be weak. I'm not quite sure. The engine didn't seem to run too much worse without #1 firing.

Good points about blocking the coolant. I'm still trying to decide on that and porting. I don't want to get to far along a path if coils and wires aren't my problem. My parts came in from Jerry's Gaskets today, so I'm starting the teardown.

[Dynomite]

Originally Posted by Paul Workman

Hmmm..... Cliff, I'm scratchin' my head, trying to think of why drilling/tapping the TB passages would require removing the coolant tubes (mounted on each side of the motor). I don't believe I did, but I've slept since then and may have forgotten. I did mask off the rest of the holes in the IH, of course, and was careful of filings, but a tiny filing or two in the coolant jacket would be no big deal, no?

Because.






It is just easier to stuff a paper towel in the injector housing which collects all aluminum from drilling and tapping for 1/8 NPT aluminum allen head Pipe plug.

Those coolant manifold bolts being stuck in manifolds along shank and in injectore housing threads is an issue with many LT5s as you know. So what a better time to install new coolant manifold gaskets and SS Allen Head bolts in coolant Manifolds when you remove Plenum.

[Dmod81]

Well, I've got it off. Have a few broken vacuum lines: the connectors on both the driver and passenger side plenum, and the coiled one that goes to the front underside of the plenum. Does anyone have any idea where I can get these?

The old wires all seem to read about 5k ohms, whereas the new ones are all between .4 and .9 k ohms. The old coils are about 7.5k ohms and the new are about 5.2k ohms. Nothing really points to #6 being any different than the other cylinders.