The new work includes the following:
Stage I ported heads
Hughes cam
B&F StageII TB
I had a friend hook it up to his scan tool yesterday. Apparently, the computer
is looking for a 600rpm idle speed, but the truck is currently idling around
750. The computer is trying to lean out the mixture to slow the idle speed down.
It also indicated the timing is being retarded at idle speed. Tonight, I'm going
to try to back the idle speed screw off some to see if it will idle at 600rpm. I
don't know if this is related to the hesitation/surge between 1800-2400rpm or
not. Also, I'm going to hook my Jacobs ignition back up as well. Any ideas???
Thanks for everyone's input so far!!!
Andre
Bob Tom wrote:
> At 07:26 PM 9/29/99 -0500, you wrote:
> > <snip> I have the Hughes cam, hughes stage I ported heads, intake mods,
> >Bruce and Frank stage II TB, JBA headers, 3" exhaust, MP computer etc.
> >The truck is very strong from 2500 rpm up with the low end weaker but
> respectable.
> >I'm having a problem at part throttle around 2000 rpm in third or fourth
> gear.
> >The engine surges quite badly and backfires (noticeable pop) through the
> exhaust.
> >My idle speed is normal and I have double checked for vaccum leaks. All
> seems ok
> >(no check engine light). Any ideas?? I'm wondering if the factory
> injectors/pump are
> >insufficient. <snip> Andre Mauboussin 95 Dak
>
> Andre
>
> Your description indicates that the problem occurs in closed loop operation.
> I'd first have the O2 sensor checked to see if it's up to snuff.
>
> When you say that you have just got everything back together, does it mean
> all of the above mods were done or just some? Also, what has been newly
> added before this problem arose?
>
> Bob, Burlington, Ontario
> '97 FR CC Sport, 5.2L, 3.55 SG, auto., 15.268 @ 88.86
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