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Car Vibrates...Rough Idle


Chad989of2000
blows both ways and is skilled in magic with any mention of diarrhea
989/2000
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Galant VR-4 org Post #: 1042577 posted 12/29/11 02:43 PM     Remind Me!  Send Private Message   Edit Post      
Recap: Just put the engine back in after having to pull it to replace freeze plugs and put on a new tranny + clutch. Also replaced the intake mani gasket which works great, making good vacuum with no more leaking.

The car starts out by revving really high at 3k rpm and then drops sharply and stalls. After a few tries the car will eventually settle down but still surges slowly between 750 rpm and 1200 rpm. The car also vibrates very significantly. The steering wheel is also vibrating, not with the surge of the engine but constantly, enough so my keys make a constant ringing noise vibrating off one another. The car goes into gear and drives forward and backward just fine (amazingly in fact with the new clutch and transmission. The check engine light also came on, never seen it on in this car before.
I'm now beginning to suspect timing belt or balance shaft belt. Both were replaced, and I used the marks to line them up. But all the research I've done points me in that direction. The car vibrates at all rpm ranges. What could be causing the car to vibrate so badly?



Chad A.
-'91 GVR-4 989/2000
-'92 GVR-4 141/1000
-'92 Miata
-'15 Forester XT Touring
-'14 Fiesta ST
-'93 NSX


Posts: 1775 | From: Livermore, CA | Member Since: 01/13/05 | IP: (76.114.200.244) | Report this post to a Moderator

Chad989of2000
blows both ways and is skilled in magic with any mention of diarrhea
989/2000
141/1000


Galant VR-4 org Post #: 1042645 posted 12/29/11 09:54 PM     Remind Me!  Send Private Message   Edit Post      
Update:

Car drives fine...amazing actually, until you come to a stop sign and it goes into idle surge vibration mode. The car feels so good, pulls strong to redline and no surging/vibrating. Oh well, idle issues it is.



Chad A.
-'91 GVR-4 989/2000
-'92 GVR-4 141/1000
-'92 Miata
-'15 Forester XT Touring
-'14 Fiesta ST
-'93 NSX


Posts: 1775 | From: Livermore, CA | Member Since: 01/13/05 | IP: (76.114.200.244) | Report this post to a Moderator

Chad989of2000
blows both ways and is skilled in magic with any mention of diarrhea
989/2000
141/1000


Galant VR-4 org Post #: 1042649 posted 12/29/11 10:08 PM     Remind Me!  Send Private Message   Edit Post      
Still hear a "whooshing" air sound from TB area (different from "hissing") when idling and car likes to rev high then stall out on cold start up. Anyone venture to guess?



Chad A.
-'91 GVR-4 989/2000
-'92 GVR-4 141/1000
-'92 Miata
-'15 Forester XT Touring
-'14 Fiesta ST
-'93 NSX


Posts: 1775 | From: Livermore, CA | Member Since: 01/13/05 | IP: (76.114.200.244) | Report this post to a Moderator

Terry Posten
Old Balls
425/1000


Galant VR-4 org Post #: 1042655 posted 12/29/11 10:53 PM     Remind Me!  Send Private Message   Edit Post      
Have you done a boost leak test?

I wonder if you have an issue with the FAIV. Maybe a blown rubber gasket.

What BOV are you using? Is it recirc or ATM?



1992 Galant VR4 click
2010 Outlander GT S-AWC Premium w/nav (wife daily)
2010 Jaguar XF Premium Luxury (my daily

Posts: 9009 | From: Davenport, Iowa USA | Member Since: 12/16/03 | IP: (50.82.187.169) | Report this post to a Moderator

stealthtt24
Holy deer monkey donkey balls looking for a pole


Galant VR-4 org Post #: 1042666 posted 12/30/11 12:18 AM     Remind Me!  Send Private Message   Edit Post      
Boost leak test and how is your ecu?



91 GVR4s 1332, 1635, 1507, all sold

Posts: 2746 | From: Orlando, FL | Member Since: 05/25/05 | IP: (174.252.135.48) | Report this post to a Moderator

Chad989of2000
blows both ways and is skilled in magic with any mention of diarrhea
989/2000
141/1000


Galant VR-4 org Post #: 1042669 posted 12/30/11 12:37 AM     Remind Me!  Send Private Message   Edit Post      
Passed boost leak test fine after installing new intake mani gasket. I'm seeing good vacuum with the car. Plus with any leak wouldn't I see a drastic effect when driving the car? I had a small hole in my other Galant's intercooler piping and that thing wanted to fall on its face if getting on it. This one drives fine.
ECU has a Keydiver chip that reflects the car's current setup. All ECU caps have been redone thanks to Terry. I really don't see any issues in that department.



Chad A.
-'91 GVR-4 989/2000
-'92 GVR-4 141/1000
-'92 Miata
-'15 Forester XT Touring
-'14 Fiesta ST
-'93 NSX


Posts: 1775 | From: Livermore, CA | Member Since: 01/13/05 | IP: (76.114.200.244) | Report this post to a Moderator

Chad989of2000
blows both ways and is skilled in magic with any mention of diarrhea
989/2000
141/1000


Galant VR-4 org Post #: 1042670 posted 12/30/11 12:38 AM     Remind Me!  Send Private Message   Edit Post   
Also...BOV is a stock 1G (crushed)recirculating.



Chad A.
-'91 GVR-4 989/2000
-'92 GVR-4 141/1000
-'92 Miata
-'15 Forester XT Touring
-'14 Fiesta ST
-'93 NSX


Posts: 1775 | From: Livermore, CA | Member Since: 01/13/05 | IP: (76.114.200.244) | Report this post to a Moderator


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