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Car Forum / Honda Cars / June 200693 Honda Accord with problems
I have a '93 Accord 10th Anniversary Ed. Automatic. I've owed the car for about 6 months and I have a couple of different problems that I hope someone can help with. 1) The engine has a rough idle when warm (500-750 rpms). When I shift out of gear and into Neutral or Park it smooths out quite a bit, but not completely. It also goes away when driving or pressing the accelerator. 2) When I am cruising at a steady speed (say between 60-70 mph) on level highway, I've noticed that the rpms will jump up about 500 rpms for no reason. It feels like a minor gear shift, but with the level terrain and the constant speed it shouldn't be shifting. It does this "shift" continuoisly back and forth. 3) I've recently noticed the smell of burning oil when the car is parked, but no signs of an oil leak. I had the valve cover and spark plug gaskets replaced a few months ago, but this has only started with in the past few weeks. Occasionally, there is a puff of white/blue smoke that comes from the exhaust on start up. If you have had similar problems or have suggestions to correct them please let me know. Thnx. >I have a '93 Accord 10th Anniversary Ed. Automatic. I've owed the car >for about 6 months and I have a couple of different problems that I [quoted text clipped - 4 lines] >not completely. It also goes away when driving or pressing the >accelerator. This one sounds like a motor mount problem. Same happened to my '92 Accord. All of them have been replaced now. > I have a '93 Accord 10th Anniversary Ed. Automatic. I've owed the car > for about 6 months and I have a couple of different problems that I [quoted text clipped - 19 lines] > If you have had similar problems or have suggestions to correct them > please let me know. Thnx. -------------------------------------------------- Even without knowing the mileage, I'll bet your Throttle Position Sensor is worn out. High mileage and Cruise Control, Prairies? That's the formula for wearing out a TPS, which will cause the RPM fluctuation. It will go away if you drive into a headwind. :-) You don't have to change the whole thing. Search it out thoroughly before paying somebody to fix it. 'Curly' >> I have a '93 Accord 10th Anniversary Ed. Automatic. I've owed the car >> for about 6 months and I have a couple of different problems that I [quoted text clipped - 29 lines] > You don't have to change the whole thing. Search it out thoroughly > before paying somebody to fix it. You can also easily check it with a voltmeter. Backprobe the middle wire and check for smooth voltage transition from closed to wide-open throttle. Use an analog VOM. Autoranging digital ones can switch ranges part way through, causing what appears to be a hitch in power.  SignatureTeGGeR® The Unofficial Honda/Acura FAQ www.tegger.com/hondafaq/ >>>I have a '93 Accord 10th Anniversary Ed. Automatic. I've owed the car >>>for about 6 months and I have a couple of different problems that I [quoted text clipped - 34 lines] > Use an analog VOM. Autoranging digital ones can switch ranges part way > through, causing what appears to be a hitch in power. check the ecu for codes before even bothering. i've had experience with this, and a dodgy tps /definitely/ sets a code. > > I have a '93 Accord 10th Anniversary Ed. Automatic. I've owed the car > > for about 6 months and I have a couple of different problems that I [quoted text clipped - 31 lines] > > 'Curly' I've done some research on what that part does and it does sound like it could be the problem. I will check it out soon and let you know. Do you think simply cleaning the contacts fix it? I don't know if it goes away when i'm in a headwind, but it does usually stop if I punch the throttle or cruise above 80 mph. It mostly occurs between 50-70 mph. Since my original post, I've been watching it a little closer and have determined that the rpm fluctuation is only about 250-300 rpm instead of the 500 I had said before. > > Even without knowing the mileage, I'll bet your Throttle Position Sensor > > is worn out. High mileage and Cruise Control, Prairies? That's the [quoted text clipped - 14 lines] > determined that the rpm fluctuation is only about 250-300 rpm instead > of the 500 I had said before. ------------------------------------- It is SO EASY to confirm. Just go to an open area or road where you can drive SLOW in first gear. When you hit the exact same RPM that it shows up at, it will start 'bucking' as it goes faster / slower. I had a Ford Aerostar with a manual tranny and a bad TPS. You had to wear a seatbelt while hunting for a parking spot or it would nearly throw you out of the seat. Previous owner apparently didn't think it was worthy of fixing!! 'Curly' > > > Even without knowing the mileage, I'll bet your Throttle Position Sensor > > > is worn out. High mileage and Cruise Control, Prairies? That's the [quoted text clipped - 25 lines] > > 'Curly' I tried what you said and the engine ran normal. The problem normally occurs around 3000 rpms. I put the car in first gear and slowly got it up to as high as 3500 and there was no bucking, jerking or anything. Does this mean it's not the TPS? Is there another way to confirm? Thanks > > > > Even without knowing the mileage, I'll bet your Throttle Position Sensor > > > > is worn out. High mileage and Cruise Control, Prairies? That's the [quoted text clipped - 32 lines] > > Thanks -------------------------------- You may not have been patient enough. (if) It's a tiny gap in the rheostat, and you could miss it easily if you slipped past it. Everything has to be warmed up just like it is on the highway too. We still don't know the mileage, do we? 'Curly' >>>>Even without knowing the mileage, I'll bet your Throttle Position Sensor >>>>is worn out. High mileage and Cruise Control, Prairies? That's the [quoted text clipped - 32 lines] > > Thanks based on that description, it shouldn't be the tps. but yes, you can confirm: check the ecu for codes. the ecu most /definitely/ registers faulty tps's. other things to check are: . throttle cable - snagging can feed back into the movement the throttle experiences. . ignition system. dodgy plug leads can cause all kinds of bizarre behavior. . engine mounts, particularly the big one behind the engine. i've never yet seen a honda this vintage that didn't have this mounting torn to blazes. . timing belt tightness. when i got my 89 civic used a couple of years ago, i was dismayed to find the timing belt crazy loose. tightening it correctly made all kinds of weird behavioral issues go away [because there's no longer any "wow" in the sensor inputs]. also do a general check for other mechanical health, vacuum control hoses, etc. |
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