1993 Honda Civic Car revs up and down whenever I turn it on

Tiny
REUBEN6969
  • MEMBER
  • 1993 HONDA CIVIC
Engine problem
1993 Honda Civic 4 cyl Wheel Drive Type unknown Manual 216000 miles

I had just recently replaced my thermostat only to find that there wasn't even a thermostat, only an old gasket for a thermostat. After starting my car, the car continued to rev continuously, from about 1500-2500RPMs, and soon after placing more water into the radiator, the car wouldnt die, but the revving still continued. This has been a problem since I have purchased my car back in may, and I have really had it. Tonight when I went to the gym the car revved up from 1500->3000 and stayed there for a while. I waited 5 minutes, and it still continued so I drove to the gym which is about 1 mile away from my house. The whole way there while not in gear the car persisted revving. And while in gear and not having any pressure on the accelerator, my car would drive on as if there was pressure. About half-way home from the gym the car stopped revving. What I dont understand is that I replaced the thermostat and now it seems to be worse. Is there something wrong with my choke or heater? Because the heater doesnt work as well. Any help will be appreciated.
Do you
have the same problem?
Yes
No
Sunday, January 6th, 2008 AT 10:25 PM

3 Replies

Tiny
BRUCE HUNT
  • EXPERT
The surging of the engine most likely continues until the engine is warm. I would check the vacuum hoses for a leak. I would consider pulling off the IAC valve and cleaning it. It can get dirty and cause this problem. Another major player causing this can be the EGR valve BUT considering that it might have gotten worse while messing with the cooling system, first see that the fluid is full and then once the engine is warm, bleed out the air in the system. Air in the cooling system messes up the sensor and causes it to read the wrong temperature. Temperature fluctuations cause the computer to think it must dump extra fuel and realize it did not need it repeatedly.
Was this
answer
helpful?
Yes
No
Monday, January 7th, 2008 AT 3:53 PM
Tiny
REUBEN6969
  • MEMBER
After trying to diagnose the problem today, I have found that there is a hose coming from near the master cylinder going to the carb area. After waiting 20 minutes for the car to stop revving, I had found a hose I would remove, and in doing so caused the car to rev again. I plugged the hole the hose connected to with my finger and the revving ceased. I replugged the hose and everything was normal. The hose was connected to some kind of one way filter, which connected to another hose. I took out the filter and cleaned it. I have no idea what the part is called. It just has an E -> on it. The arrow points to where the air was being sucked. Tomorrow when I turn my car on if it continues to rev, I want to try and replace the part, but idk what the part is called. Any help again, is gladly appreciated
Was this
answer
helpful?
Yes
No
Monday, January 7th, 2008 AT 5:25 PM
Tiny
BRUCE HUNT
  • EXPERT
Is the part behind the master cylinder for the brakes?
Was this
answer
helpful?
Yes
No
Tuesday, January 8th, 2008 AT 11:59 AM

Please login or register to post a reply.

Recommended Guides