[Shotimes] 95 MTX Running Terribly Rich

[David Rosicke]

Check the little black vent valve on the top of the tank.  If you have filled the tank to the brim many times, then that valve stays open, leaking the fumes out.  I replaced mine and it helped with the smell.

 

Dave R.

 

 

Message: 1
Date: Sun, 16 Oct 2005 01:05:57 -0400 (Eastern Daylight Time)
Subject: Re: [Shotimes] 95 MTX Running Terribly Rich
From: "Carl Prochilo" 
To: "M Khan" 
Cc: "shotimes" 

Mike, This doesn't necessarily mean the car is running rich.

When you open the gas cap, do you hear a loud hissing noise. If so,
it mean you have a restriction in the venting path back to the gas
tank causing excessive pressure in the fuel system. In many
instances, the smell can come from the front of the car. Two possoble
causes is that the CANP solenoid has failed or there is restriction in
the return line back to the tank. I've had a situation on my 92 where
the T junction right by the radiator drain cock had become plugged
with a white parrafin substance that I was able to clear with a paper
clip. One way to test this is to disconnect the tubing in one of
several places, and with the gas cap removed, take a baggie and cover
the filler neck with a baggie and use a rubberband to secure it to the
neck. While a help watches, blow into the tubing up front of the car
and ensure the baggie inflates. If there is a restriction, the gas
fumes need a place to go.
Play around with this and you will figure out what's wrong.
-- 
Cheers,
Carl Prochilo
92 Ultra Red Crimson

On Sat, October 15, 2005 1:02, M Khan said:
> Need some help here,
>
> My 95 MTX has been running terribly rich lately. The
> smell of gas gets really, really strong when sitting
> at idle after the engine is fully heated.
>
> Some symptoms:
>
> - Hard to start, long cranking periods. Often only
> starts on second attempt.
> - Codes 211 and 214, CKP and CPS. (542 also....not
> worried about it.)
>
> Tach operation is fine. No real driveabiltiy issues,
> drives fine.
>
> What's my best plan of action? Should I change the
> CPS? Some searching on shoforum leads to a possible
> bad DIS?
>
> Help me out everyone....
>
> Mike
> 95 MTX