Elle

"Jim Yanik" <jyanik@abuse.gov> wrote
> "Elle" <honda.lioness@nospam.earthlink.net> wrote
>> Based only on reading here and a bit of googling, I'd
>> also
>> investigate whether the catalytic converter was partly
>> plugged. Google on same for more info. Of course, then
>> the
>> big question is how it got plugged. Related to the EGR
>> system?
>
> If the cat was restricting,it would affect running ALL the
> time,not just
> after warmup.

I think I understand what you're saying, ("If it's plugged,
it's plugged! Even partly plugged... ), but from my reading,
the symptoms of a partly plugged cat converter become more
manifest with, say, acceleration and warmup.

http://www.aa1car.com/library/converter.htm, among other
sites, has some stuff on how temperatures yada affect cat
converter operation.

Grumpy AuContraire

zardozrocks wrote:
> I have a 1987 Honda Prelude 2.0 SI. It's the fuel-injected model. If
> the car is cold, it will start up immediately and runs great - i can
> lay a patch of rubber. It will run perfectly immediately following a
> cold start. Once the car has traveled a few miles, however it starts
> to lose power quite dramatically as I attempt to rev it up past about
> 2000 RPM as though it were starving for fuel or air or something. The
> problem will happen in any gear but seems a teeny bit more pronounced
> in the higher gears. Around this time, the PGM-FI light comes on on
> the dash.
>
> I've been looking at this problem for some time now and I have had
> some repairs done:
> * rebuilt/replaced fuel injectors
> * new fuel pump
> * new air/fuel/oil filters
> * replaced EGR valve
> * checked main relay for broken solder - it seems fine
>
> After posting here previously someone told me to check the ECU codes.
> The ECU code that is blinking is code #12 which for my car means a
> problem with the EGR system. When I took the car in for repairs last
> January to a small shop, the mechanic claims he replaced the EGR valve
> so I'm inclined to rule that out.
>
> Any hints on what it could be? Would a clogged oxygen sensor result
> in the ECU sending code 12? Any advice would be much appreciated! I
> MUST fix this problem and simply cannot afford expensive repairs.
>


You left out the mileage on this vehicle. How many miles on it?

JT

Matt Ion

Tony Hwang wrote:
> zardozrocks wrote:
>>> Hi,
>>> Heat/cold expand/shrink things. You already done quite a few rmedial
>>> tries. Checking vacuum for proper level won't hurt.
>>> Also checking all the ground point like fuel pump ground joint is
>>> good idea.
>>
>>
>> OK I'll buy the heat expansion/contraction, but I'm also wondering if
>> that will solve the car complaining about the EGR problem (code 12 on
>> the ECU).
>>
>> Most importantly, HOW do I check for a vacuum level on the intake
>> manifold? Got any links or suggestions?
> Hi,
> Take a minute and think about how EGR valve operates. Manifold vacuum
> does many things.

I'm wondering, does it also operate the EGR valve, like it does in my
carb'd '87 Accord, via a vacuum diaphragm? There could be a leak in
that vacuum line or even the diaphragm itself, and the leak is only
presenting itself once the car warms up enough to activate the EGR.