Loss of Power

Page 1 of 2  
Hi, got a question about an '86 Accord DX. What might cause a dramatic loss of horsepower (almost as if the car is "choking"). It starts fine
and all regular maintenance is has been kept up. One mechanic suggested carburetor, but when I took it to a specialist, he said the carb looked fine (it had recently been replaced).
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
twb01 wrote:

Could be any number of things - can you be a little more specific with the symptoms? Does it happen all the time? Only when cold? Only when warmed up? On the flat or up hills?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Matt Ion wrote:

Checked fuel pump ground? Make sure fuel pump works well upto spec.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Tony Hwang wrote:

Wouldn't really have the same effect on a carb'd engine - all the pump needs to do is keep the float bowl full.
Still, hard to say for sure without more details from the OP.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Had a similar problem with an 85 (carburated), Make sure the big hose from the exhost manifold to the air cleaner is in place and does not have holes or cracks, also check that the diverter valve in the air cleaner(Where that hose connects) operates properly.(on mine the link from the vaccum motor disengaged fron the valve). HTH JerryR
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
snipped-for-privacy@yahoo.com wrote:

That would (or should) only affect things when the engine is cold... and we still don't know exactly when this problem occurs.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

That is not so!. My problem showed up(intermmittently) when the engine was warm(after 30 min. into an hour trip) and when the engine was colder(during the first 30 min of use) JerryR
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
snipped-for-privacy@yahoo.com wrote:

That hose from the exhaust manifold shroud to the breather is intended to channel warm air from around the manifold into the breather *while the engine is cold*. Once it warms up, the diverter should close and allow cool air to be drawn in from behind the fender, and it should stay that way as long as the engine is warm. Piping in hot air will increase the chance of knocking and definitely NOT help your performance (REMOVING that hose would have helped, if the diverter was sticking or opening intermittantly).
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Matt Ion wrote:

Ever experienced intermittent fuel pump due to poor grounding?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
In my case it malfunctioned whether cold or at operating temp, on flat roads and on hills. Fuel pump had been replaced some time ago.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
twb01 wrote:

Okay, so... when this happens, it just happens randomly? Does the power loss last for a while, or does it come and go? If it's intermittent, what do you do to get power back - pump the gas, turn the car off and restart it, etc.?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Full power never returned. That's why I thought maybe the engine was beyond repair.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
"twb01" wrote

I had a similar problem with my 1973 Toyota Celica. Being that that car is far older than yours, the cause may be entirely different.... My problem turned out to be a bad cylinder head that apparently wasn't getting proper cooling to the cylinders, or something like that. (Turned out that Toyota had a recall on the head, but didn't let their customers know it directly. I found out about it by complaining to a dealer service manager who was willing to listen.) I recall the symptom showed up mostly when trying to climb even a moderate hill, even when getting a good running start up.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

maybe the timing belt jumped a notch(or 2),or the distributor timing is off?
--
Jim Yanik
jyanik
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On Fri, 21 Dec 2007 03:57:01 -0800 (PST), twb01

Does it shake, or is it smooth with its low power?
Will it even get the car up to 55?
I gather there's no smoke or smell?
No potato stuck up the tailpipe?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
There's a bit of a shake. Speed tops out at 17-20 mph. No smoke.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
twb01 wrote:

That sounds more like one or even two cylinders aren't working. At all. Have you checked that all cylinders are getting spark? (Sorry if you already answered that, my stupid newsserver is expiring anything older than a week...)

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
I have not checked the cylinders.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
As maybe the least knowledgeable poster on this newsgroup, might I ask if it could be water in the gas? Did the 86 still actually have distributor points? I had an 87, but unloaded it long since.
J.
On Fri, 28 Dec 2007 16:13:56 -0800 (PST), twb01

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
JXStern wrote:

Pretty sure they were all electronic ignitions by then. The ignitors have been known to fail as well, but that would generally cause it not to run at all. If one or two cylinders aren't working, that would more likely be the distributor cap itself, the spark leads, or the plugs.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Related Threads

    Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.