I have a 1999 Honda accord ex v6 that surges intermittently when it warms up but does not have any fault light. Any ideas?harold
When you say surges I take it you mean that the RPM's are going up then down? Try cleaning your Idle Air Control Valve. Here's a short "how to" video: http://www.youtube.com/watch?v=gOECtpdfqyk
Thanks for the suggestion. I replaced the entire throttle body, cleaned the IAC, replaced the distributer and the roto, the fuel pump relay and the ignition electrical body. The car runs good idling. The problem surfaces when the engine is warm, that is, it loses power like it is not getting any gas. I press the gas but nothing happen then suddenly it kicked in and run good then it happen again. the RPM drops when this happens. It acts like when it gets hot something closes off and when it cools off it reopens. This usually happens when on the highway. I let my foot off the gas and the car coasts with no problem. as soon as I put my foot back on the gas it reoccurs. Could it be after the fuel pump been stressed for a while it becomes intermittent? This is very difficult to diagnose. What makes this so difficult is there is no CEL. I took it to a Honda garage and they don't know what's causing it and they want to keep it to try different things. That would cost me for every item tried even it did not fix the problem. HELP!, HELP!
Sounds like a bad TPS. Throttle Position Sensor. I was checking out some sites and I ran across one where people were having a similar problem as you. Apparently, when doing some major repairs, the MAP sensor and the TPS sensor where accidently plugged into the wrong connectors. They are very close to one another, and they are identical connections. Very easy to plug one into the other. Here is the site: http://autotechdiagnostics.com/?p=344 If you didn't mistakenly swap the plugs, you may just have a bad TPS.
Thanks, I changed out the entire throttle body and no fix. The connector to the MAP and The TPS are the same but the location would be intentional to swap them. Could a O2 sensor cause this? How about the CAT? Thanks, Harold
A bad O2 sensor shouldn't affect your power. I have a bad O2 sensor on my Camry right now. No loss of power. Your Cat may have started to plug up. You could just unbolt it and let it hang down a bit and give it a test drive to see if you have full power again. A quick change of the O2 sensor wouldn't hurt. Since you have no CEL, it's pretty much anyone's guess. When you changed out the throttle body did it come with a new TPS?
Yes. The TPS on the throttle body is put on with non removable fasteners and the iac sensor with 5 point torx tool. They were put on to not be serviced by owners.
The only other thing I can think of is the VSS. Vehicle Speed Sensor. Have you changed that out also?
No. Is that part of the transmission? thanks, Harold
It fits into the transmission. You can go to Youtube or Google and type in Accord VSS location. Most models you can reach it from the engine compartment. Here is a site that lists the symptoms of a bad VSS: http://www.ehow.com/facts_6779778_symptoms-bad-speed-sensor.html
Reelin68, Thanks for your reply. I disconnected the o2 sensor before the CAT and ran the car for about 30 miles and the problem seems to have gone away. I will replace the sensor later and let you know what expired. I now am getting a P0135 code but that is because of the disconnected o2 sensor. Thanks, Harold
Well that's a relief! What an easy fix!
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