HT4100 4.1, 4.5, 4.9 Discussion, engine shake - 91 el dorado 4.9 in Cadillac Engine Technical Discussion; hello everyone let me first say i'm lovin the forum
i have a 91 el dorado. it was having missfires ...
hello everyone let me first say i'm lovin the forum
i have a 91 el dorado. it was having missfires and a high idle. i replaced the fuel injectors and the car idles fine and doesnt miss. but now upon acceleration i feel the engine shake a little bit. it was 10x worse before the new injectors but it still occurs none the less. does anyone have any ideas what could be causing this? i dont think its related to the injectors even though it seemed to lessen the problem when i replaced them.
the car passed smog today so emissions are running fine. new stuff:
egr valve and solenoid
all 8 fuel injectors
spark plugs, wires, and distributor + rotor
oil and filter
Alot of instances where there are no codes, it is a fuel problem. You might want to check the fuel pressure with a test kit. Harbor Freight has them for $20. Also, with the key on and engine off, pull the vacuum hose off of the fuel pressure regulator and look for any signs of fuel inside. There should be none.