I have a pretty stout vibration at idle that smooth up if I press the gas or raise the rpm above 900. It's driving me nuts, especially since it wasn't doing it before. It runs fine otherwise.
It's a used engine I dropped in, it has brand new
Rotor Cap and Finger
Main and rod bearing
I can take the serpentine belt out, doesn't change, no codes stored, balancer doesn't shake at all. Compression are fine, cam is alright.
No loose bolts/nuts, no vacuum leaks. I hooked up my timing light and it showed about 18* of advance at idle, though light hasn't been used in years and once I took it out, it wouldn't work until I popped it open, so I don't want to rely on what it says until I double check with another one.
If you guys can point something I forgot, that would be great.
Injectors are all spraying fine, I check the connections twice.
I kept the original flywheel, but I took it out to clean it up while replacing the tranny. It is on torque and I still have the same vibration. I just cleaned up a spare throttle body from the old engine and will swap it out monday.
I need to get somebody else timing light to double check my result. If it is my problem, I guess I can only get a new ECM.
Well, I checked the MAP sensor and it is on specs, tried a new one for the heck of it, same result. I also swapped the throttle body, TPS and IAC for a different unit and still the same.
I'm going to get a different timing light to double check the advance.
When I pay attention, I can tell the idle wave up and down slightly. Also, it takes a few engine revolutions to start it, but it may be the way all 2.5L starts.
I just checked the timing with another light, It shows 14 to 16 of advance. It hoovers between the 2 aa the idle goes up and down. I also find I have a partially clogged cat, thanks to that sweet whistle and smell of rotten eggs in the cap when I take the rear window down.
At 8* of advance on the harmonic balancer, the dizzy gear is past number 1 plugs, but not by much. I'm trying to take the dizzy out but the nut won't budge.