I must have one because I bought the part :-\

I'll go look under the hood now, but Inever have had a car that it wasn't in the rear by the tank. Thanks!

 

I found the fuel filter, it is buried behind the intake manifold, beneath a black electrical box just under the VIN location.

Hopefully this will fix the fuel delivery problem.

 

Alright, the new fuel filter did not fix the problem, so again...

About 30 or 45 minutes after warm up the car will loose power and begin to (intake) back fire.

It does this for less than a minute until the check engine light comes on and the computer goes into back-up mode, then it clears up and runs fine although the light stays on. Upon key off and restart the light will stay out until this happens again.

I looked up this code on an unconfirmed source and it vaguely states, "defective or malfunctioning fuel supply system". Can someone give me a better description of code 43 and perhaps a troubleshooting procedure.

 

Fuel Pump maybe?

 

I sure hope not, first I'd like to try all the cheap and easy things. What's next along those lines? So far I've put a new fuel filter on it. The poor performance will last a few minutes but once the check engine light comes on in back up mode the car runs smooth and fine.

 

Take out the spark plugs & look at them. Compare against the pictures here on this link...

http://www.ngksparkplugs.com/techinf...q/faqread2.asp

You replaced the ECT sensor, otherwise I'd suspect that. Maybe the O2 sensor? How old it that?

I'm not sure but I think code 43 is kind of a catch-all code, when the ECM can't say any single sensor is obviously fried, but overall the system isn't right. For example if the ECT or O2 sensor is reading wrong, but it's not so bad that it isn't reading at all. The ECM can only blame a particular sensor if it's completely dead or unplugged.

Have you managed to get your hands on a Helm book for that car yet?

 

Hi Jim, remembering back to the whole ECT problem, it was never replaced because it was the connecting wire that was broke. I snipped a wire/connector from a wreaked car's harness and replaced it only, the ECT was never pulled so it has an unknown condition.

I have been thinking to doubt the fuel pump is bad because the car runs fine with the check engine light on in back up mode. I'm not sure but to me the computer in back up mode would not fix a failing fuel pump.

The spark plugs/wires are brand new but am I looking for signs of fuel fouling? This "fuel delivery" problem started shortly before all the other problems and is all I have left to fix. No book yet but I feel I'm at the point where I really need to have it.

 

I think you're right, if the fuel pump was bad it wouldn't run well in limp-mode. I'm pretty sure it's either OK or it really doesn't work.

Fuel pressure regulator?? Fuel pressure isn't measured by the ECU, so if it's wrong, the ECU would have to change the injector firing to make the O2 sensor happy. Then the whole system doesn't 'add up' correctly. Code 43 since it doesn't know if the injectors are bad, fuel pressure is wrong, or O2 sensor is wrong.

AutoZone has tools to 'borrow' for free, maybe they have a fuel pressure gauge. Then maybe someone will know what the pressure is supposed to be for 1990??

 

I'm thinking it's got to be something electronic but as you said it runs fine in limp-mode. Well I hate to say it but the car may go to the dealer$hip because it would probably save money and time in the long run.

 

One last clue before I give up, the (described above) problem this car has seems to be worse in cold weather, both engine performance and length in time before it goes into back up check engine light mode. When it's warm outside the problem isn't near as bad.