Rough Idle!
10-03-2005 | 11:59 AM
#1
Rough Idle! Ok heres a few things going on with my car, first ill give some details, feel free to let me know what you think about any of these. 01 z28 around 54,000 miles, bone stock. I run nothing but 93 or 91 gas in it and have the oil changed frequently with 5x30w val. synpower. The problems are....
1) a clear antifreeze smell when i pop my hood, but only after i have drove it.
2) after letting off of the throttle or holding 1/4 throttle it sounds like beads or something are rattling around in my intake/engine....then it quits once its back to idle
3) also at idle the engine seems to have picked up a ticking noise, ive listened to a few piston slap clips, but it doesnt sound quite as loud, but could possibly be the same. The only thing is the ticking quits as soon as you give it some gas and doesnt come back until it is at full idle, it does seem to vibrate the car, which is a new one also.
as you can see most of these issues come at idle. The car performs fine and i have no surging of any sort. All the gauges are fine and the car idles at around 600rpms. I was told maybe the water pump was the issue....any ideas?
1) a clear antifreeze smell when i pop my hood, but only after i have drove it.
2) after letting off of the throttle or holding 1/4 throttle it sounds like beads or something are rattling around in my intake/engine....then it quits once its back to idle
3) also at idle the engine seems to have picked up a ticking noise, ive listened to a few piston slap clips, but it doesnt sound quite as loud, but could possibly be the same. The only thing is the ticking quits as soon as you give it some gas and doesnt come back until it is at full idle, it does seem to vibrate the car, which is a new one also.
as you can see most of these issues come at idle. The car performs fine and i have no surging of any sort. All the gauges are fine and the car idles at around 600rpms. I was told maybe the water pump was the issue....any ideas?
10-03-2005 | 02:41 PM
#4
Antifreeze smell will probably go away if you get your
fans programmed to more sensible temps. Like 195/196
and 197/198 for off/on temps, low & high. Stock settings
are stupid hot and will let the heads boil on shutdown if
you sit without cooling airflow. Then you crack the cap
and puke to the reservior, voila!, coolant stank.
I forgot about this until one time I reloaded a stock
tune to my car. Then, gurgle, gurgle, smell.
Check exhaust manifold heat shields and other stuff as a
source of rattle, also AIR checkvalves. Use a bit of tubing
as a stethoscope. Listen inside the valve cover. Some
internal issues like rocker arms losing bearings, etc. can
make top end clatter. Just work to localize the noise -
in, on, off-motor.
fans programmed to more sensible temps. Like 195/196
and 197/198 for off/on temps, low & high. Stock settings
are stupid hot and will let the heads boil on shutdown if
you sit without cooling airflow. Then you crack the cap
and puke to the reservior, voila!, coolant stank.
I forgot about this until one time I reloaded a stock
tune to my car. Then, gurgle, gurgle, smell.
Check exhaust manifold heat shields and other stuff as a
source of rattle, also AIR checkvalves. Use a bit of tubing
as a stethoscope. Listen inside the valve cover. Some
internal issues like rocker arms losing bearings, etc. can
make top end clatter. Just work to localize the noise -
in, on, off-motor.