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1991 Honda Accord Runs ok for until warmed up.

Tiny
DK012377
  • MEMBER
  • 1991 HONDA ACCORD
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
Runs ok for a minute or 2 then once it warms up the idle drops down and the engine runs poorly. Check engine light comes on at the same time that you hear it start to run bad. Code comes up as the crank angle sensor. We have tested it using an ohmeter as desc in the Haynes repair manual we have, but it tests good.
Also this may be unrelated but there is a knocking noise coming from the engine, it can be heard more towards the drivers side and it is always there whether it is warmed up or not
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Saturday, November 14th, 2009 AT 3:34 PM

6 Replies

Tiny
HONDA TECH 1818
  • MECHANIC
  • 536 POSTS
Remove the distributor and check the bearing on it, sometimes when the distributor bearing binds it will cause codes and misfire.
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Sunday, November 15th, 2009 AT 10:24 PM
Tiny
DK012377
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  • 20 POSTS
How do we check the bearing?
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Monday, November 16th, 2009 AT 5:14 AM
Tiny
HONDA TECH 1818
  • MECHANIC
  • 536 POSTS
Make a mark on the top bolt hold down, so you don't have to adjust the ignition timing. Remove the three distributor hold-down bolts. Remove the distributor and spin the rotor shaft to see if it spins smoothly or binding. Most likely you will need a new distributor if the ecu stores a crank angle sensor code. Was it a code 4?
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Tuesday, November 17th, 2009 AT 2:19 AM
Tiny
DK012377
  • MEMBER
  • 20 POSTS
Yes it was a code 4. The repair manual we have for it said to use an ohmmeter to test the crank angle sensor at the electrical connection for the distributor, but it tested fine (engine is off at time of test). I am wondering since it runs ok at 1st, if it is opening after it warms to a partticular temp. Even if we turn off key and then restart it will run fine again for 10-30 seconds. 1st start of the day it runs for a couple minutes good before it messes up.
I would hate to put that much money into replacing distributor and then find out it still does it. I just don't see the problem anywhere else. Maybe we will have to replace and pray for the best.
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Tuesday, November 17th, 2009 AT 11:13 AM
Tiny
DK012377
  • MEMBER
  • 20 POSTS
I guess we are more worried about the other noise it makes (described in original post) that we are going to fix the way it runs but then still have to deal with something more major with whatever is causing that noise.
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Tuesday, November 17th, 2009 AT 11:15 AM
Tiny
HONDA TECH 1818
  • MECHANIC
  • 536 POSTS
You tested the sensor and is ok, it could be distributor bearing is worn and when the engine is on the shaft inside the distributor will wobbles, then the crank angle sensor will have wrong inputs to the ecm, then causes misfire and it will cause engine noise also. The best way to check is to remove the distributor and check the shaft.
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Wednesday, November 18th, 2009 AT 1:09 AM

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