Help! Wierd Stuff Happening...
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Joined: May 2006
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Help! Wierd Stuff Happening...
Ok, I own a 1995 Integra GSR. I will be driving down the road at a constant speed, lets say 3000 rpm, running like a champ, then out of the blue, the tach needle will Jump around like crazy up to 4000 ish and down to 2500 ish really fast. Some times the car will die and other times the bouncing will stop. It happens at any rpm, most of the time while crusing but sometimes it happens while stopped at a light.
I have a VAFC installed and when the tach bounces around on the car's guage, the VAFC reads a constant RPM reading where the engine running at. I get a CEL 14 which is idle air control valve. I thought that it was ignition related so I replaced the cap and rotor, spark plugs, sparkplug wires, Distributer, and ignition coil. The problem still exits... I swapped The idle air control valve and the map sensor from another car which runs great and it still happens. The ignition timing is set up perfect.
Could my problem be related to the ECM? Please Help Me, This is driving me crazy, I am pulling out my hair trying to figure out the problem.
I have a VAFC installed and when the tach bounces around on the car's guage, the VAFC reads a constant RPM reading where the engine running at. I get a CEL 14 which is idle air control valve. I thought that it was ignition related so I replaced the cap and rotor, spark plugs, sparkplug wires, Distributer, and ignition coil. The problem still exits... I swapped The idle air control valve and the map sensor from another car which runs great and it still happens. The ignition timing is set up perfect.
Could my problem be related to the ECM? Please Help Me, This is driving me crazy, I am pulling out my hair trying to figure out the problem.
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From: A forum with actual tech
Since everything electrical has been checked, it could possibly be a fuel problem. Check the fuel injectors before you think it is the ECU.
If those look good, swap a known good ECU in and see if the problem goes away.
If those look good, swap a known good ECU in and see if the problem goes away.
Thread Starter
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Joined: May 2006
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I figued it out!
I just fully rebult the motor with CTR pistons last month and it ran great for 200 miles until it started to go nuts. This issue was really pissing me off I could not figure it out. Then yesterday it dawned on me to check the 3 grounds on the engine. One on the valve cover, one on the transmission, and one on the thermostat. After close inspection, I found out that the bolt on the thermostat ground was loose. I took a little bit of sand paper and cleaned the contatct point and torqued down the sucker... And abrakadabra!!!! It runs perfect now. YAY!!!! 
The wirdest thing was that I was getting a CEL code 0 the day before (code for a bad ecu). I am glad that I did not drop $200 on a used ecu from ebay. I am still out of $200 for a distributer and $75 for a coil I did not need. Oh well, Live and Learn... I would have never known that a loose bolt could cause so many problems 
.
The wirdest thing was that I was getting a CEL code 0 the day before (code for a bad ecu). I am glad that I did not drop $200 on a used ecu from ebay. I am still out of $200 for a distributer and $75 for a coil I did not need. Oh well, Live and Learn... I would have never known that a loose bolt could cause so many problems .
...
Joined: Jun 2005
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From: Ottawa
Originally Posted by inline4me
I just fully rebult the motor with CTR pistons last month and it ran great for 200 miles until it started to go nuts. This issue was really pissing me off I could not figure it out. Then yesterday it dawned on me to check the 3 grounds on the engine. One on the valve cover, one on the transmission, and one on the thermostat. After close inspection, I found out that the bolt on the thermostat ground was loose. I took a little bit of sand paper and cleaned the contatct point and torqued down the sucker... And abrakadabra!!!! It runs perfect now. YAY!!!! The wirdest thing was that I was getting a CEL code 0 the day before (code for a bad ecu). I am glad that I did not drop $200 on a used ecu from ebay. I am still out of $200 for a distributer and $75 for a coil I did not need. Oh well, Live and Learn... I would have never known that a loose bolt could cause so many problems .
The wirdest thing was that I was getting a CEL code 0 the day before (code for a bad ecu). I am glad that I did not drop $200 on a used ecu from ebay. I am still out of $200 for a distributer and $75 for a coil I did not need. Oh well, Live and Learn... I would have never known that a loose bolt could cause so many problems .