98 Prelude SH running rich, need advice

#11

Were the 02 sensore(s) you replaced from Honda or aftermarket?
because from what i know aftermarket sensores dont tend to work as good as
Honda O.E. ones unfortanetly there a one of a kind. also check your ignition wires
plugs cap roter sounds like your computer is getting misguided info from a sensore(s)
to send more fuel to try and compensate for something. i would do an emission test
and collect the data it may help.
www.tegger.com/hondafaq/misc/Causes%20of%20high%20emissions.pdf

--
johnin

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#12

"qslim" <Suckers@suckersdotcom> wrote

Quote:

I'm trying to help my friend fix his 98 type SH (everything stock), and I
wanted to see if anyone here with a lot of Prelude experience has any
ideas. Heres what I have:
Got an o2 code (P0135) and a rich code (P0172). We replaced the 02 sensor
first, hoping it was the root cause of both problems. It wasn't. Now we
have a rich code, and the data list figures confirm it. After running long
enough to get into closed loop, the car idles low and stalls. It will run
at speed okay sometimes, but once in a while it will also cut out while
driving. We checked fuel pressure, and the #s are within spec. The fuel
damper is new. Drained the gas tank to be sure we're working with good
fuel. The map sensor is reading accurately. TPS voltage curve is linear
with no spikes or abnormalities. 02 sensor voltage occiliates from .2v -
.8v normally.
The fuel trim #s on this puppy are both around -18%, but of course, we
can't figure out why. Today we pulled the fuel rail and turned the pump on
to see if an injector may be leaking, but didn't see any leaks. I'll be
checking timing next as a matter of due course, though I don't suspect it
because the problem seems to come and go. If timing was the issue I'd
think the problem would be baseline and never leave.
We are considering injectors, but I'd like to know for sure that we
haven't overlooked anything as these suckers are about $500 for a set!
Anyone out there have any ideas for me? Thanks.

As a former Prelude owner I found this site very useful for info

http://www.absoluteprelude.com/

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98 Prelude SH running rich, need advice

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Re: 98 Prelude SH running rich, need advice - 07-21-2006 , 04:28 PM

Re: 98 Prelude SH running rich, need advice - 07-21-2006 , 07:38 PM