symptoms of low compression? - Honda Prelude Forum

knbond1 · 03-21-2008, 04:47 PM

what are some signs of loss of compression on a motor?

Prelude1897 · 03-21-2008, 05:24 PM

if the motor just dies while sitting at idle, that's a major sign

knbond1 · 03-21-2008, 05:42 PM

what about if its running fine on the highway and what not then when i come to a stop light as i let off it idles to the point where it almost stalls out, then rises back the the proper idle but then starts to misfire??? thats my problem.

Artifex · 03-21-2008, 08:24 PM

That's not necessarily a compression issue. Misfires can be caused by poor maintenance in general. Ignition and sensors are the first things to check.

Prelude1897 · 03-21-2008, 08:50 PM

mine sometimes does that, but like Artifex said, it could be a misfire or something along those lines. Is your check engine light on?

knbond1 · 03-21-2008, 11:42 PM

yea it is on, but the entire ignition system has been replaced. i.e. the plugs, wire, cap, rotor, coil, and the ign. control module

boymeetsfence · 03-21-2008, 11:47 PM

Sometimes with a CEL the car is just generally sluggish and idle will dip. I would really look into that CEL tho, that would probably solve your problem

knbond1 · 03-22-2008, 08:00 AM

its a cylinder 2 and 4 misfire, and o2 sensor 2, which is on b/c there is not cat on the car. but then when it misses, theres this p1399 code that says manufacturer ignition control or misfire

98auto · 03-22-2008, 09:51 AM

have you checked the crank sensors?

knbond1 · 03-22-2008, 01:58 PM

yea those are fine, besides wouldnt that throw its own code?

Joja Boi · 05-15-2008, 06:52 PM

did anyone find a resolution for the 1399 code?

98auto · 05-16-2008, 12:05 PM

it may or may not throw a code if they fail intermitently

natemanas · 05-16-2008, 06:44 PM

I'm getting a CEL 71.. is this related to this thread?
I hope my compression is ok..

BBYlude · 05-16-2008, 08:07 PM

I'd go ahead and do a compression test, at the very least it's good information about your engine. You can pick up a cheap compression set and the test is as easy as changing your spark plugs.

TruNinja619 · 05-17-2008, 08:12 PM

Quote:

Originally Posted by knbond1

what about if its running fine on the highway and what not then when i come to a stop light as i let off it idles to the point where it almost stalls out, then rises back the the proper idle but then starts to misfire??? thats my problem.

pop the valve cover off and check for valve clearance on all 4 cylinders. Sounds like you might have some tight valves. It may even be possible you might have some burnt valves. 1st generation CR-Vs are notorious for having tight exhaust valves, and when you don't catch them in time, they usually throw misfire codes and have burnt valves.

edit: I wonder if he solved his problem. I just realize he made this thread like 2 months ago.

knbond1 · 05-18-2008, 08:29 AM

No i still havent fixed the problem in my car, some days are better than others. it is the weirdest thing that i have experienced. but i will look into the valve clearance thing