1989 Chevy Celebrity Engine Check Light

[rimmy]

I have a 1989 Chevy Celeb is having a weird problem. I have done a search on the forums but have found anything similar to this.

When driving the speedo drops to 0 and then the Check Engine Light goes on. At this point it starts to run rough with little power. If I press on the brake while this is going on, the car sometimes (but not always) stalls out. I have gone through some basic troubleshooting, but still have not fixed the problem. It is a 2.5l 4 cylinder engine, automatic transmission.

Has anyone had similar problems like this? Any help would be greatly appreciated, I am running out of things to do.

Thanks in advance for any advice.

[jsgold]

Have you been able to retrieve any trouble codes from computer since the check engine light is coming on?

[rimmy]

Not yet. It's relatively new.

After messing around w/the speed sensor earlier today and cleaning the fuel injector some it cleared up for about an hour or so. Took the car for a couple drives and everything seemed good. On the way to a movie tonight the same symptoms started happening. Since it's midnight now and I work tomorrow I don't think this is really the best time to take a look at it .

Again, thanks for any help. It's needed

[public]

Check the harness to the Ignition switch. As the contacts get old they can come loose. The switch may be bad, but I would check the plug before replacing anything. The clue is your hitting the brake and causing a change. The harness runs down the top of the steering column and then right above the brake pedal. Your hitting the brakes may be shaking this wire. I cannot think of anything under the hood that would cause this when you hit the brakes othe than a loose ground wire. Good Luck.

[rimmy]

Thanks. I will definitely give this a try before hitting any place else up. Appreciate your help. <crosses fingers>

[rimmy]

After going through pretty much everything, hooked up a reader and got a prom chip error. When talking to a mechanic he said he had only dealt w/that once before and that it was more than likely something w/the onboard computer. Swapped the computer out, working fine now. (Well, three days fine).