yamatokh

This happen to me a few times, but today it was pretty bad. When i start the engine, it idle as normal, but when you press on the gas padel, the rpm rev up to 2K and drop down to 1K, and go up again. It sounds like this - Zoom...(2K).....po po po (1K).....zoom...(2K)....po po po down to 1K. And the car won't run!

The worst thing is that it comes and goes, can't fiture out why it does that. When i doesnt' do that, the car runs perfect, just sometimes when you start the engine it does that. Normally i can just restart the engine and it will go away, but not today. As I was runing in the mountains, the engine surging all of the sudden, so i had to pull aside and see what's going on. For 20 min, no matter what i do, the engine just won't rev. Lucky after endless try, the car rev again, so I drove down the mountain immediately. For 40min, it run fine. Until I pull into a restaurant and had lunch, when i came out, the car does that again. It scared me so bad that i went straight home.

oh, and when the car surges like that, i smell gasoline in the car, but didn't smell anything in the engine bay, must came from the exhaust or something.....

Does anyone expeirence this before? What could be causing this? The only mod to the engine i have done is K&N cone filter (airbox gone) and racing beat exhaust.....

Please help me, I don't feel safe driving this car anymore until i can pin point what's going on. Thannks.

wonder1and

What gen do you have?

yamatokh

1990 GXL

FC3S\AE86

I had that proplem last week....and it runs find after I changed my plugs.

David Hu$tlerhoff

"oh, and when the car surges like that, i smell gasoline in the car, but didn't smell anything in the engine bay, must came from the exhaust or something..... "

i think it must be something with the ignition, coz that gasoline you smell must be from unburned fuel.

David Hu$tlerhoff

or maybe it is the fuel injection. when the rpm goes down, the engine doens't get enough fuel (for any reason). the gasoline you smell could mean that the engine runs very rich. could be a freakened ecu or so. i don't know, just guessing and try to analyse a bit

David Hu$tlerhoff

it's me again
could it be a broken exhaust sensor, or any other sensor?

yamatokh

I think i might have solve the problem.

THe problem might be caused by the throtte position sensor, which got stucked. I solved the problem with some WD40

But that was just my guess, ever since that problem never occur (after 3 days) If it happen again, that means it's something else, but for now, it seems like it's working...

thanks for all the advise