[melvyn]

My lil Scoupe's been behaving a bit strange lately...

First, I noticed that low speed and partial throttle driving has become somewhat jerky. When I'm getting on the gas, everythings fine, but trundling around city streets the car jerks a lot. Where would be a good place to start looking for a cure??

And then... in the last couple of days the air conditioner compressor has started to cut in and out quickly. Rather than run for several minutes at a time, it runs for a second, then stops for a second, then runs, stops, and repeats for several minutes before coming on as normal. As this happens, the revs rise and fall and I notice the car seems to slow a little. Before I commit to visiting an air-con specialist, is there anything I could check??

 

[jrh382]

melvyn...
That sounds like a fuel related problem to me. If the revs are dropping then picking back up...something may be clogging your fuel line causing to jerk like that. Try this: Go to your local pep boys or car parts store and buy a new fuel filter. Its cheap and you can do it yourself. All fuel filters look different for what type of car you have. My old corolla had this tiny white thing that was located at the top of the engine which was easily replaceable. Nowadays, such things like this and the oil filter are all stowed away out of reach so they can charge you for service. Locate it first, before you go out and buy it. Places like Pep boys have a book that has the year and model car, and you can look it up and get what you need. It shouldn't be too hard. Its a cheap way and could easily fix a problem that could cost a lot in the shop.

Now, for the A/C problem....Bad relay.

2000 Black Hyundai Elantra GLS
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[Random]

I was thinking the Throttle Position sensor.

The AC compressor should cut out at 80% throttle, that is why it would cycle on and off, and also why your car would buck and jump and why the engine rpms would see-saw.

My guess is at low RPM, when the TPS kicks up, it it litteraly drowning your car in fuel, hence the bog.

Leave it to Random to Needlessly complicate things.

 

[melvyn]

Thanks for the input guys.

I managed to download the workshop manual as a bunch of .pdf files from the Hyundai Webtech site (http://www.hmaservice.com/webtech/). It's been a long time since I've had to do any wrenching on my cars... guess I better get some practice in. <img src=icon_smile_big.gif border=0 align=middle><img src=icon_smile_big.gif border=0 align=middle><img src=icon_smile_big.gif border=0 align=middle>