Please help diagnose chirp from back of motor only when hot???
07-20-2009, 09:15 AM
#1
Please help diagnose chirp from back of motor only when hot??? Going crazy here with this problem. I recently swapped motors and I'm getting going with the new one, everything is installed now.
A chirping type noise has been present since the install. It sounds like a squeaky belt. AND, it only happens when the motor is hot and at RPMs.... so never when cold, and ALMOST never at idle.
At first I thought it was the belts, changed belts, idle pulley tensioner, problem still exists.
Spun all the accessories, squirted with WD-40, no luck.
I bought a mechanics stethoscope to isolate the problem but no luck. But while using it I realized the sound is coming from the back of the motor (which is just awesome since its so easy to work on back there
). So I thought maybe I have an intake manifold or header leak. Torqued down the headers, loosened and then tightened the FAST 92 again using the specified sequence and not overtightening. Still chirping!! I think that I have a good seal on the MAP sensor, I've held it down tight while revving but still get the chirp.
WTH is going on? What else can I troubleshoot here?! Help would be GREATLY appreciated!
A chirping type noise has been present since the install. It sounds like a squeaky belt. AND, it only happens when the motor is hot and at RPMs.... so never when cold, and ALMOST never at idle.
At first I thought it was the belts, changed belts, idle pulley tensioner, problem still exists.
Spun all the accessories, squirted with WD-40, no luck.
I bought a mechanics stethoscope to isolate the problem but no luck. But while using it I realized the sound is coming from the back of the motor (which is just awesome since its so easy to work on back there
). So I thought maybe I have an intake manifold or header leak. Torqued down the headers, loosened and then tightened the FAST 92 again using the specified sequence and not overtightening. Still chirping!! I think that I have a good seal on the MAP sensor, I've held it down tight while revving but still get the chirp.WTH is going on? What else can I troubleshoot here?! Help would be GREATLY appreciated!
07-21-2009, 06:23 AM
#3
On The Tree
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Yeah check it with the clutch in (if it is an m6). I also had a car do this once and it turned out to be the starter gear rubbing on the flywheel. Do you have an aftermarket starter?
07-22-2009, 10:33 PM
#6
FormerVendor
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It could be a vacuum leak or a bad PCV valve. I have had both cause a high piched whistle that sounded like a squeak. Also, make sure nothing is pinched between the bellhousing and the block that could be causing an input shaft to pilot bearing mis-alignment.
Shane
Shane
