[Bulk] Re: [Gmecm] Gmecm - Does anyone know if there are any tricks tousingabig cap HEI on a 747 ecm?

[Jason M.]

check out your other sensors, I had a similiar problem with my 92 caprice, 
dead spot on the throttle position sensor.  At idle the TPS values 
constantly changed, just off idle they went to zero, then were fine up to 
WOT.  Caused surging in rpm, I didnt' check to see what the timing was doing 
since I just hooked up my scan tool and saw the TPS problem, then verified 
with an Ohm meter.

btw, when running smooth timing on that caprice jumps around a bit, maybe 8 
degrees total.  Really it's more of a sweeping from advance to retarded then 
back.  I'm not sure as to the cause.
----- Original Message ----- 
From: "Mark Romans" <romans at starstream.net>
To: <gmecm at diy-efi.org>
Sent: Friday, June 02, 2006 10:42 AM
Subject: [Bulk] Re: [Gmecm] Gmecm - Does anyone know if there are any tricks 
tousingabig cap HEI on a 747 ecm?


> It surges with the est hooked up.
> Mark
>
> ----- Original Message ----- 
> From: "Steve Ravet" <Steve.Ravet at arm.com>
> To: <gmecm at diy-efi.org>
> Sent: Friday, June 02, 2006 6:28 AM
> Subject: RE: [Gmecm] Gmecm - Does anyone know if there are any tricks to 
> usingabig cap HEI on a 747 ecm?
>
>
>
>
>> -----Original Message-----
>> From: gmecm-bounces at diy-efi.org
>> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Mark Romans
>> Sent: Thursday, June 01, 2006 10:54 PM
>> To: gmecm at diy-efi.org
>> Subject: [Gmecm] Gmecm - Does anyone know if there are any
>> tricks to using abig cap HEI on a 747 ecm?
>>
>> Gmecm - Does anyone know if there are any tricks to using a
>> big cap HEI on a
>> 747 ecm?
>>
>> I have a friend who put a 747 ecm in his 80 Buick and is
>> running a big cap HEI and a 747 ecm.
>> The Car runs great with the EST Bypass disconnected, except
>> it doesn't have any power due to low timing advance in the
>> module, when he hooks up the EST bypass the timing jumps all
>> over the place.
>
> I've seen that at idle also on my TBI blazer.  I think it's "normal".
> Ignoring the timing light, how does it run?
>
> --steve
>
>
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