Mike,
I'm not as familiar with 1500 Midgets (my partner, Steve, usually takes care
of them and the 1500 Spitfires, as he's the Z-S expert). However, if the
engine has a Gulp valve (and I'm at home now where I do not have a reference
book to check), I'd say that's still a possible culprit.
Since you replaced each of the electrical components and the problem didn't
go away, I'd have to start looking for a non-electrical problem.
Mal-adjusted valves or vacuum leaks would be my first thought. Have you - as
Larry Hoy suggested, done a compression check?
Lawrie
British Sportscar Center
-----Original Message-----
From: Michael Graziano <mgrazian@ltcm.com>
To: 'Lawrie Alexander' <Lawrie@britcars.com>
Date: Tuesday, July 06, 1999 7:39 AM
Subject: RE: #2 Cylinder Not Firing -> Ignition....
>Larry,
>
>Here's the origninal post. It's a '78 Midget
>
><inserted here>
>
>Well, the saga continues. I bought a $20 coil this weekend to try and get
>the car past emissions. That sport coil I bought 400 miles ago died
>already. It'll have to go back....
>
>Once again, almost running smooth, but my #2 cylinder is not firing
>consistantly. I'm
>pretty sure it's ignition related b/c when I put the timing light on the #2
>wire, I only get it to light intermittently as if there is no spark going
>to the plug. The misses revealed by the timing light coincide with mini
>backfires from the exhaust.
>
>I put a new cap and rotor, a new wire (Accel 8mm Silicone, and I tried
>different ones, even ones I KNEW to be good), and a new NGK plug. It
>still only gets intermittent spark. The spark is more consistant at higher
>RPM's, BTW. Any ideas. Here are the car specks (you guys should know
these
>by heart already <grin>)
>
>'78 Midget 1500 (Spit Engine)
>Optronic Lumenition Ignition System
>Standard Lucas 45DE4 electronic distributor (The electronics are disabled)
>ZS Carb
>No ballast resistor
>Conductive Jelly on wire connector at distributor cap.
>
>Michael
>
> __/__,_
> _____(_o___o_)_______________________
> / \
>| Michael Graziano |
>| Long Term Capital Management L.P. |
>| Phone: 203-552-5706 |
>| Fax: 203-552-5869 |
>| Email: mgrazian@ltcm.com |
> \_____________________________________/
>
>-----Original Message-----
>From: Lawrie Alexander [mailto:Lawrie@britcars.com]
>Sent: Tuesday, July 06, 1999 10:31 AM
>To: Larry Hoy; Michael Graziano; MGList (E-mail); Spridgets (E-mail)
>Subject: Re: #2 Cylinder Not Firing -> Ignition....
>
>
>Somewhere I missed the original post but............
>
>If a 1968 or later MGB misfires only on No. 2 cylinder, 9 times out of 10
>it's because the Gulp Valve has gone bad. Try removing the valve and
>plugging off the hoses fittings. If the valve is bad, the misfire will
stop.
>
>Lawrie
>British Sportscar Center
>-----Original Message-----
>From: Larry Hoy <larryhoy@cwix.com>
>To: Michael Graziano <mgrazian@ltcm.com>; MGList (E-mail)
><mgs@autox.team.net>; Spridgets (E-mail) <spridgets@autox.team.net>
>Date: Tuesday, July 06, 1999 7:16 AM
>Subject: RE: #2 Cylinder Not Firing -> Ignition....
>
>
>>Yeah, I thought a bit more about that after I pushed "send".
>>
>>Seems that if it is only #2, and it is intermittent, that it's gotta be
the
>>distributor cap, the plug wire or the spark plug.
>>
>>Pull the plug wire off the spark plug, replace the spark plug with a screw
>>driver. Hold the plastic handle of the screw driver and hold the shank of
>>the screw driver about 1/4 inch from the engine block. Crank the engine
>and
>>check for spark. If you have spark then do the same thing but use the
plug
>>instead of the screwdriver (use insulated pliers to hold the wire/spark
>>plug). When this technique was last mentioned on this list someone
>>suggested you don't lean against the car while doing this. Good idea.
>>
>>Another thing is to try is to swap plugs around and see if the problem
>>moves.
>>
>>Larry Hoy, Denver, CO USA
>>1970 MGB Daily Driver ~ 1967 MGB Vintage Racer ~ 1969 MGB Undergoing V8
>>conversion
>>http://home.cwix.com/~larryhoy@cwix.com/
>>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>>> Larry,
>>>
>>> Compression is OK. 130lbs cold and within 10% of all except #3 which is
>>110.
>>>
>>> Michael
>>
>
>
>
|