Really Odd Problem - Please Read

[Titan]

This problem just started today, out of nowhere.

Yesterday, I did a compression test on my motor. SOHC KA. So I pulled the plugs, coil, and fuel fuse. Everything went fine, and the car drove fine after I was finished.

Today, next morning, I start the car and find it running terribly. The exhaust pulses as if not all cylinders are firing. The motor shakes periodically. But at higher rpm's it smoothed out considerably. The worst was when I give it some throttle from a stop.. the motor will shake quite violently as the exhausts pulses sound like a tractor.

So I checked as many connections as I could. All seemed fine. I disconnected the negative terminal on the battery. When I reconnected it after about 5 minutes, the motor won't even crank over! Which is totally odd, considering it was cranking over perfectly fine before I disconnected the battery terminal. The cabin is getting power (clock, dash, etc), but it won't even crank.

Any ideas? Sounds like a computer problem to me.

[kandyflip445]

Make sure that you have the terminal nice and tight. Check your spark wires, that they are connected good.

[Titan]

The terminal is nice and tight. The wires are a bit loose on the plugs, but they've always been like that.


UPDATE - the car now starts after just sitting for a few minutes. So, I disconnected the negative terminal again, reconnected it, and the car doesn't start again. But after sitting for a few minutes, the car starts.

And still, the motor runs like sh*t. Vibrating the entire car even at idle.

[s13irdie2]

the same things happening to me. try cleaning out the maf or the throttle body. it may help with the idle. you can check if your timing is right. www.240sx.org tells you how to change the timing. hope this helps.

[Titan]

Thanks for the advice, but I don't think that's it.


I mean, she was running perfectly the night before. The the next morning.. all has gone to sh*t.

[s13irdie2]

if it wont even crank at all, the starter might be bad. are all the grounds in tact?

[Titan]

Thats the thing. If I disconnect the battery terminal, then reconnect it, the motor won't crank.

But if I wait for 10 minutes without doing a single thing, then it will crank and start.

[aznpoopy]

imo get a timing gun and check your timing.

[ftrs13]

the problem you are experiencing sounds very similar to mine, Im very interested in what comes of this

[Bradman123]

that does sound pretty wierd. maybe the ground cable is going bad or something. so even though you have it connected to the terminal maybe the actual wire isnt making good contact with the connector deal that goes to the terminal. maybe its the positive. check the voltage at your battery...it really sounds like the main battery cables arent sending the juice the starter and everything else needs to crank. on my sr if the positive starts to come of the battery even a little bit it will start to idle funny or even high but it still gets enough of a connection to run the lights or other accessories. if i go and push it back on tighter it is back to normal. so i would deffinately check it out. i cant see how checking your compression would cause all this.