- Dec 28, 2011
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So, since I built the top end of the 5.0 in my truck, I have had a random engin. shimmy/shudder/shake/whatever. Ive been trying to track down the cause but have been unsuccessful. Here is a video of another engine that looks to have the same "shudder" mine does:
View: https://m.youtube.com/watch?v=tktt4EHNCGM
Have any of you ever seen anything like this? It is completely random and inconsistent. Some shakes are more violent than other. Whenever the engine shudders the rpms dont seem to change nor does the exhaust note change.
Engine mods: tfs 170 61cc track heat heads (thermactor air function turned off in tune), custom ground ed curtis cam, 1.6 probe roller rockers, moss ported lower intake, jba shorty headers, magnaflow y-pipe, dronemaster 40, 3:73 frpp gears. Also turned off in tune: knock sensor function, and egr function. Truck put down 225/267 to the wheels. Poopy numbers if you ask me but when you consider the 205/275 they came with from the factory (to the flywheel) I guess its not terrible.
Some more details and things that have been suggested on other forums:
Fuel pump/fuel trims: This would have shown up in the A/F on the dyno, no?
Spark/miss: New plugs (gapped at .050) and wires, new tfi and coil, original distributor.
Motor mounts: Maybe?
Bad balancer: Not likely?
EGR: Still leaking exhaust gases into upper, despite being turned off in computer. Thoughts?
Anyway, trying to eradicate this engine shudder but havent been able to. Ideas please? No codes, cylinder balance test passes on first go.
If I dont have it figured out by mid-May then its going back to the tuner, and maybe he can uncover something with his data logs. In the mean time, Im bored and like tinkering, so lets figure this out =).
Thanks fellas.
View: https://m.youtube.com/watch?v=tktt4EHNCGM
Have any of you ever seen anything like this? It is completely random and inconsistent. Some shakes are more violent than other. Whenever the engine shudders the rpms dont seem to change nor does the exhaust note change.
Engine mods: tfs 170 61cc track heat heads (thermactor air function turned off in tune), custom ground ed curtis cam, 1.6 probe roller rockers, moss ported lower intake, jba shorty headers, magnaflow y-pipe, dronemaster 40, 3:73 frpp gears. Also turned off in tune: knock sensor function, and egr function. Truck put down 225/267 to the wheels. Poopy numbers if you ask me but when you consider the 205/275 they came with from the factory (to the flywheel) I guess its not terrible.
Some more details and things that have been suggested on other forums:
Fuel pump/fuel trims: This would have shown up in the A/F on the dyno, no?
Spark/miss: New plugs (gapped at .050) and wires, new tfi and coil, original distributor.
Motor mounts: Maybe?
Bad balancer: Not likely?
EGR: Still leaking exhaust gases into upper, despite being turned off in computer. Thoughts?
Anyway, trying to eradicate this engine shudder but havent been able to. Ideas please? No codes, cylinder balance test passes on first go.
If I dont have it figured out by mid-May then its going back to the tuner, and maybe he can uncover something with his data logs. In the mean time, Im bored and like tinkering, so lets figure this out =).
Thanks fellas.