Re: [tech] random misfire problem

[TBerk16@aol.com]

In a message dated 10/26/98 7:52:05 AM Pacific Standard Time, aventari@cts.com
writes:

> Yeah, the fuel pump is suspect, but i dont think it could cause misfiring
>  like this and then supply enough fuel for the new engine to run up to
>  7000rpm easily in 3rd. But i'll give it a try
>  	I did check voltage at the fuel pump a few months ago, and it was around
>  11 volts. I get 13.1 volts at the battery when the alt is charging, and
>  12.0 with the lights on drving around. pretty low to begin with. 
>  What I'm going to do is get some stereo power wire like Stinger 8 or 10
>  gauge and run it to a good relay next to the pump with power directly from
>  the battery, and switch the relay with the original power wire. 
>  Where can I get a good weatherproof relay?? Pref. Hella?
>  


How about encasing it in a small weathertight box? I saw something like this
in a Maritime catalog once while looking for block and tackle stuff. Even may
find a weather rated relay.

Here is a rethink; since it's not auto sound then maybe you'd want to keep the
relay inside the cabin somewhere and just run the switched power to the pump.
By replacing the wire for a larger gauge one as you suggest it should loose
less voltage over the run than the old wire that's been in there all this
time. Plus you'd be replacing the contacts in there at the same time, I'll bet
these are some of the problem as well.

Since I'm off and running with the fuel delivery tangent then how about the
filter(s) and pick up in the tank? Clogged? Gummy? 

The air leak thing is a probable cause as well.  Any way to get this thing on
a 'scope ?

TBerk
all over the map diagnosis a specialty.

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