Hesitation, vibration, and noise after clutch install
#1
Hesitation, vibration, and noise after clutch install
I installed a flyinmiata stage 1 clutch kit and a resurfaced flywheel. Now I'm getting vibration, hesitation/bogging/possible clutch slippage, and a squeaking noise during idle and acceleration. It has a lot less power and only boosts to 7 psi where it used to boost to 11. During the install I replaced the throw out bearing, pilot bearing, main seals and gasket.
So far I adjusted the pedal adjustment, bled the slave cylinder a few times, added more grease to the slave cylinder rod, tightened all ground wires, and changed the spark plugs, to no avail.
During the install I re-calibrated my LC1. My AFR levels seem typical to preinstall. I checked my ECU maps and gauges and everything seemed fine. I tried adding to my master fuel trim and oddly enough 40% trim stopped the noise and slowed vibration a bit. Power also increased a bit and was able to boost to 9 psi. AFR was 12ish at idle and 9ish at WOT. There was still a bit of bogging and exhaust noise. Tomorrow I'll re-calibrate to see if it's way off and causing it to run super lean without me realizing.
When I get a chance again I intend on dropping the transmission to see if something was installed wrong or got hit out of whack during the install.
Any suggestions on what it could be? It's miserable to drive and I regret the install. It drove better with the pilot bearing shot.
So far I adjusted the pedal adjustment, bled the slave cylinder a few times, added more grease to the slave cylinder rod, tightened all ground wires, and changed the spark plugs, to no avail.
During the install I re-calibrated my LC1. My AFR levels seem typical to preinstall. I checked my ECU maps and gauges and everything seemed fine. I tried adding to my master fuel trim and oddly enough 40% trim stopped the noise and slowed vibration a bit. Power also increased a bit and was able to boost to 9 psi. AFR was 12ish at idle and 9ish at WOT. There was still a bit of bogging and exhaust noise. Tomorrow I'll re-calibrate to see if it's way off and causing it to run super lean without me realizing.
When I get a chance again I intend on dropping the transmission to see if something was installed wrong or got hit out of whack during the install.
Any suggestions on what it could be? It's miserable to drive and I regret the install. It drove better with the pilot bearing shot.
#6
Too bad you weren't close to Detroit as we have fancy scopes, pressure transducers and vibration accelerometers to and we could probably drill down on your issue and at least help you sleep a little better.
#9
Ok, so I tried pulling plug wires to see if it changed idle and all wires lowered idle except for cylinder 3. I remember seeing a lot of fuel on the spark plug when I changed earlier this week. Does this indicate a definite blown cylinder 3, or could it also be a bad plug wire (already ordered) or bad coil? Also why would a clutch change blow a cylinder? Would I need a new motor or is one cylinder serviceable?
#10
Today I switched plug wires 2 and 3 on the coil to see if idle would lower when I pulled the plug out of cylinder 3 and it didn't. Wouldn't this indicate that the coil pack is fine? I changed the plug wires and pulling cylinder 3 wire out still didn't lower cars idle? Could a leaking injector be causing this? I'm also getting a check engine code for an 02 sensor after cat, but I read this had no effect on idle and power.
The last thing I did was check compression to make sure the cylinder was in good condition. Cylinder 3 seemed decent.
1,2,3,4
Dry 180 168 168 180
wet 200 181 187 205
The last thing I did was check compression to make sure the cylinder was in good condition. Cylinder 3 seemed decent.
1,2,3,4
Dry 180 168 168 180
wet 200 181 187 205
#11
Ok, so I tried pulling plug wires to see if it changed idle and all wires lowered idle except for cylinder 3. I remember seeing a lot of fuel on the spark plug when I changed earlier this week. Does this indicate a definite blown cylinder 3, or could it also be a bad plug wire (already ordered) or bad coil? Also why would a clutch change blow a cylinder? Would I need a new motor or is one cylinder serviceable?
#15
Did you install the map sensor and adaptronic at the same time as the clutch?
Those are maf, tps, iac, and o2s codes, no misfire codes. Are you getting spark on 3? I would guess you left something unplugged or damaged some wiring/grounds upon install of the trans?
I don't like the #'s on cylinders 2&3, but 168psi is not low enough to cause incomplete combustion and a dead miss like your seeing. How about a leaky injector? What is your wideband reading at idle?
Those are maf, tps, iac, and o2s codes, no misfire codes. Are you getting spark on 3? I would guess you left something unplugged or damaged some wiring/grounds upon install of the trans?
I don't like the #'s on cylinders 2&3, but 168psi is not low enough to cause incomplete combustion and a dead miss like your seeing. How about a leaky injector? What is your wideband reading at idle?
Last edited by flounder; 04-22-2012 at 01:18 PM.
#18
I checked the o ring of the injectors and all seemed fine.
But what confused me is after re-installing everything. I pulled the plug wires during idle again this time cylinder 4 didn't lower idle instead of cylinder 3. I didn't make a point to put the injectors back to the same cylinder it was in before. Now I am wondering if the one injector is bad and I put it back in cylinder 4.
I did an injector test(not really sure how to read it) in wari. But it looks like they're working normal.
I don't know what the hell is going on.
But what confused me is after re-installing everything. I pulled the plug wires during idle again this time cylinder 4 didn't lower idle instead of cylinder 3. I didn't make a point to put the injectors back to the same cylinder it was in before. Now I am wondering if the one injector is bad and I put it back in cylinder 4.
I did an injector test(not really sure how to read it) in wari. But it looks like they're working normal.
I don't know what the hell is going on.
Last edited by PhantomRoadster; 04-22-2012 at 09:44 PM.
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