7afe low idle Options

[SAE-HI]

Ok so i just performed an oil change on my 7afe. The first couple of weeks the car was fine but now when the engine is at normal operating temperature the rpm idle drops to about 600-700 rpm and the car feels like its about to die. Anybody know why it does this? nothing is wrong with any vacuum lines, everything has been kept up to date.

[Bitter]

Jump E1 and TE1 in the diag box and then start the engine, the engine should be warmed to operating temp before starting and all accessories should be off. This places the engine into base timing mode with no advance or retard, do not drive the vehicle in this mode. To check timing allow idle to stabilize and then check timing off plug wire #1, snap the throttle a couple times while checking timing to ensure it always settles back down to the correct position. It should be 10 degrees BTDC, only non OBD2 are adjustable, later models are fixed timing even if the distributor is rotatable as the ECU uses crankshaft and camshaft position to set ignition and fuel injection timing. Timing set too advanced will cause a high idle and possibly preignition or ping under load without the use of higher octane fuel, ignition timing set too low will cause sluggish acceleration and high emissions as well as a low idle. The 7A with adjustable timing runs very well with 15 degrees timing and 89 octane or better fuel, pairs well with bolt ons such as an air intake and ebay header+exhaust.


But if you're idling at specification and it still feels rough either you have one or more cylinders not running correctly or worn mounts or both issues going on. The passenger side mount is responsible for most of the idle quality issues reported. Assuming your engine is running perfectly with good compression across the board and all cylinders contributing 100% the mount is the cause of a rough feeling idle, it's not that the engine is running roughly it's that you're feeling it in the cabin due to a worn mount transmitting too much vibration. If it feels 'boomy' in the cabin at idle it's the mount worn out.