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Date:         Wed, 24 Sep 2014 21:56:31 -0400
Reply-To:     PSD <psdooley@VERIZON.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         PSD <psdooley@VERIZON.NET>
Subject:      Re: Engine Shudders -2.1L WBX.
Comments: To: John Rodgers <jrodgers113@GMAIL.COM>
In-Reply-To:  <CA+az7_4sOjJWKzia3JPuqQn7c_NAm=8Y8devMB3nsL_CYixHoQ@mail.gmail.com>
Content-type: text/plain; charset=US-ASCII

Sometimes TQ problems can cause shudder. Or maybe a bad mount? CV joint?

If it feels like the engine drops a cylinder under load, I would suspect an ignition problem. You can check the wires for arching in the pitch dark and mist them with a spray bottle to stress test them.

One way to isolate a specific cylinder misfire is to disable each cylinder one-by-one and see if the problem gets worse. If it doesn't, that's your dead cylinder. Of course on a 4 cylinder engine, this means your running on 2 cylinders sometimes. This could be problematic on a rolling test so do your testing in a traffic-free area.

Or wait for better advice from someone else :)

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of John Rodgers Sent: Wednesday, September 24, 2014 8:41 PM To: vanagon@GERRY.VANAGON.COM Subject: Engine Shudders -2.1L WBX.

I have a 1991 Carat with auto tranny. On floorboarding to go up a hill or kick down into a lower gear to pass, the engine seems to drop a cylinder an shudder as if not firing. I have a Shoebox Electronic ECU Monitor hooked up and have the engine fine tuned and all the numbers are good and the lights are correct, yet I get this shudder anyway. I checked with an induction timing light the firing of each ignition wire up 2500 rpm. Each was good. Yet it still shudders on pressing the pedal to the metal.

Any ideas?

John the Gimp


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