NVW
Well-Known Member
Fuel filter
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454 with 4l80
- Thread starter tanman_2006
- Start date
tanman_2006
Just a farm kid...
On a TBI 350? Never had one cause rough idle, just low power. I really think that would have been changed. The guy is half owner in the local parts store. I'd change the fuel filter for giggles but I'm still thinking it ran like the 95 TBI 305 I had in highschool that kept jumping timing.
NVW
Well-Known Member
This is what I went by, no mention of idle
tanman_2006
Just a farm kid...
Got ya. It was missing at idle pretty bad and dang near shaking the truck like it had one heck of a cam.
- Staff
- #25
The pickup coil in the distributor on those is known to crack, and throw the timing all over the place.
tanman_2006
Just a farm kid...
That's what mine did. It also wore off the gear on the cam by 200k miles
Will L.
Well-Known Member
A great way to learn about the cracked plastic/ spark travel is grab a hold of the top of the distributor. Just remembering that makes my hand and elbow hurt again. "Hey Will, feel the crazy vibration on the distributor- I think thats why it's running funny." No, I didnt catch him, but I sure chased him a ways.
Throw a timing light on it. Compare spark rate between all cylinders. Have you pulled the plugs to see how they are all burning? My favorite chart from hose days:
Throw a timing light on it. Compare spark rate between all cylinders. Have you pulled the plugs to see how they are all burning? My favorite chart from hose days:
- Staff
- #28
The distributor gear problem was moreso on the vortec or roller motors. GM used mellonized gears for there roller cams, and were notorioys for either using the non mellonized gear or having poor mellonize coating on them. Once the surface coating wore off, the gears rapidly chewed up. The flat tappet engines didn't have many gear problems.
tanman_2006
Just a farm kid...
I had to get a new cam at 250k miles (while it was out I "upgraded") and rebuilt the top end. Honestly wasn't up set that's pretty good life. Knowing what I know now I would have kept the OEM cam specs since they seemed to have the best/adequate bottom end performance.