[Miata] '02 Miata Bucking Without CEL - Big Mystery!

[Bryan Wyatt]

It's worth noting that this happened with the tank about 1/2 to 3/4 full.  Is there any way to clear out the condensation?  Some sort of alcohol-based solution?
 
-Bryan

--- On Mon, 5/26/08, Ray Ayala <ayala.ray at gmail.com> wrote:

From: Ray Ayala <ayala.ray at gmail.com>
Subject: Re: '02 Miata Bucking Without CEL - Big Mystery!
To: bryanewyatt at yahoo.com, "Miata Power List" <miatapower at miatapower.net>, "Miata Mailing List" <miata at realbig.com>
Date: Monday, May 26, 2008, 9:42 PM





My dad had that happen once and it turned out to be condensation in the fuel tank.  Apparently a few small puddles of water will drift around on the bottom of the tank and part of one will occasionally get sucked up by the fuel pump.
 
 

----- Original Message ----- 
From: Bryan Wyatt 
To: Miata Power List ; Miata Mailing List 
Sent: Monday, May 26, 2008 4:41 PM
Subject: '02 Miata Bucking Without CEL - Big Mystery!






All,
 
I'm not sure how to describe this in one word, but here goes the long version:
I was on my way home driving across Ohio this weekend and 3 separate times the car (an '02 with stock everything intake/exhaust/ignition and about 60k on the clock) began to buck uncontrollably.  The revs would bounce within a 500rpm range of whatever value they were at when the car began to buck.  The only way to "cure" the problem was to turn the car off and wait for it to cool down.  Unforutnately, the car didn't always start on the first try.  Very frustrating!
 
As I said before, the car is stock everything (I even put on a stock exhaust after I bought it).  I replaced the plugs about a month (and 1000mi) ago, but the car did this same thing on the old plugs.  It will even repeat the behavoir at random in the parking lot at work driving at no more than 25mph.
 
Any ideas?  Could heat soak be affecting the coils or wires?  Maybe even the Cam Angle Sensor?  The car seems to start up after I let the engine cool.  Is there a way I could effectively cool off the engine bay?
 
To repeat one last time...the car does not throw a CEL even after the car is restarted.
 
Thanks for your help!
 
-Bryan and The Tick




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