[Diy_efi] desperate need of help
Programmer
nwester at eidnet.org
Wed May 28 03:29:30 GMT 2003
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>> I have spoken to
> them many times and cannot get any answers for my
> problem. The engine idles pretty good in open loop.=20
> Once in closed loop the idle will not stabilize. It
> will surge up and down about 200 rpm. I have checked
> for a vacuum leak and have none. The block learns are
> around 114 at idle and map kpa is about 44. The iac
> counts stay steady around 20 to 24 counts. Under no
> load in park while holding the accelerator steady
> about 1500rpm the rpm will flucuate up and down about
> 100 rpm.<<
That's a characteristic of a slow O2 sensor. Depending on where
you've got the O2 placed, it may never get any better than that.
>> The engine runs well under load. I have
> checked the usual things like compression, valve adj.
> vacuum is good at around 21 in hg. I spent time
> drifting propane around all vacuum fittings and into
> the crankcase to check for a leak under the intake. I
> can't find one. I need help to determine what the
> problem is and how I can go about fixing it. I wound
> appreciate any input.
>=20
> Thanks,
> Mike Opp
Your only solution may be an open loop calibration (at idle). Disconnect =
the O2
sensor and see if your "surge" is gone.
Lyndon.
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<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial =
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<DIV><FONT face=3DArial><BR><FONT size=3D2></FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>>> I have spoken to<BR>> =
them many=20
times and cannot get any answers for my<BR>> problem. The =
engine idles=20
pretty good in open loop. <BR>> Once in closed loop the idle will not =
stabilize. It<BR>> will surge up and down about 200 rpm. =
I have=20
checked<BR>> for a vacuum leak and have none. The block learns=20
are<BR>> around 114 at idle and map kpa is about 44. The =
iac<BR>>=20
counts stay steady around 20 to 24 counts. Under no<BR>> load =
in park=20
while holding the accelerator steady<BR>> about 1500rpm the rpm will =
flucuate=20
up and down about<BR>> 100 rpm.<<</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>That's a characteristic of a slow O2 =
sensor.=20
Depending on where</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>you've got the O2 placed, it may never =
get any=20
better than that.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>>> The engine runs well =
under=20
load. I have<BR>> checked the usual things like compression, =
valve=20
adj.<BR>> vacuum is good at around 21 in hg. I spent =
time<BR>>=20
drifting propane around all vacuum fittings and into<BR>> the =
crankcase to=20
check for a leak under the intake. I<BR>> can't find one. I =
need help=20
to determine what the<BR>> problem is and how I can go about fixing =
it. =20
I wound<BR>> appreciate any input.<BR>> <BR>> Thanks,<BR>> =
Mike=20
Opp<BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Your only solution may be an open loop =
calibration=20
(at idle). Disconnect the O2</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>sensor and see if your "surge" is=20
gone.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Lyndon.</DIV></FONT></BODY></HTML>
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