bought a car from a guy who let the car sit for 5-10 because fuel pump went out so i put in fuel pump now it has no power idles rough backfires through the filter. and if u leave it idliling it dies after a minute or 2. i checked timing it was fine check fuel pressure 45psi. so i checked codes on it is said code 43. when i pulled out spark plugs one side was covered in fuel and other side was fine. any ideas? it a 90 camaro 3.1

 

here is some info I pulled off another post.....



Check the following:

Wiring and connections to ECM terminal L.

Wiring and connections from the ESC controller to the ECM.

Wiring and connections from the knock sensor to ESC controller.

Voltage at ECM A-B connector terminal B7 should be over 6 volts unless the system is sensing detonation.

If the above is OK you might have a faulty ESC sensor or module.



sounds like might be a knock sensor problem.....somewhere to start anyways.

 

also, was the only reason the car was parked was fuel pump?? could of had other problems....was it 5-10 years....you might want to go through everything and give it a major tune up, replace all filters, wires, plugs, etc. etc..

 

When I bought my '88 GTA that had sat for two years, that was what I had to go through to get it running. Also, consider changing the CAT and O2 sensor.

 

I tried to tAke o2 off but it is swelled up Inside and it also gets glowing red when Tring to drive it I heard the cat may have got stopped up and that's why it is running like that

 

I would definitely change both - in addition to the full tune-up. My understanding is that if the O2 sensor is not reading right and the mixture is too rich, then the CAT will fail.

My experience with my GTA was a lot of rough running, stalls, etc. I did the tune-up, O2, CAT and had about 14,000 trouble-free km before I parked it.

These cars do not like to sit!!!! Keep them running to keep them healthy.

 

For the cat, you may be able to take from the cat back off from the cat and then beat the cat with a hammer and all the inside crud will pour out. I'd replace that o2 sensor because it's pretty cheap as well. I don't know how your trying to take it out but, are you using a persuasion bar?

 

Didn't have long to mess with it today but Ill definately get it out Tuesday but another thing that gets me is that one banks spark plugs web u take them out are literaly Dripping with gas

 

i would say do a full tune up cause 5-10 years is a long while for the car to sit there the wires are probably deteriorated and the plugs are prolly all gunked up the dizzy cap and then the rotor also i think would help..cause it sounds like a fire problem not fuel

 

bump

 

bump

 

im thinking coil and timing.. coil first.. haynes manual shows you how to check it. all you need is a paper clip and a ohms meter. except in the hanyes manual ignore the coil windings test.. just primary and secondary. then check your spark plugs..

 

First off, don't pay too much attention to the V8 guys concerning this. They don't have the basic system our 3.1s do... theirs has an additional control module for the ESC system that the knock sensor (right next to the starter solenoid if you need to know) connects to. Go and get a knock sensor. But, be warned, the old one may NOT want to come out without a fight.

Does the engine run better with the ESC (timing) bypass connector disconnected? Also check the wire to the sensor... I have a spare pigtail for the fan switch on my 87 that's just hanging there if yours is bad. It's the same connector with a different color wire.

FYI, for the 3.1, the KS signal goes straight to the ECM, not through any ESC module or anything like that, and the computer adjusts the timing accordingly. Here is a wiring diagram... The KS is in the middle, labeled as a detonation sensor.

:edit: Also, the cat MAY be clogged, but your engine doesn't run long enough to know. The other reason that exhaust parts tend to glow red is because of running excessively lean (possibly because of the KS). The first thing I would do is a full tune up (like you should if the car has been in storage for a long time anyways). Also check and replace your vacuum hoses and lines accordingly. If you touch one and it either breaks or it leaves a black dust similar to brake dust on your fingers, it's bad.

 

i dont think the cat is clogged because i took off the y pipe form the manafold and it ran the same. i also checked the injectors and they were fine.

 

Check your fuses for inj1 and inj2 if one is bad only three injectors will fire and the fuelpump will still work .

 

One of the first things you should have done when you got the car home was to go over it with a magnifying glass. Generally, when a car sits for THAT long, a number of things start going south. Namely, brake and fuel lines, brakes (altogether), rubber parts (tires, suspension bushings, vacuum hoses), and especially whatever fluids are trapped within the running parts (gas, oil, trans fluid, rear gear oil). Not only that, but, depending on where the car was stored, you may also have the problem of infestation by both nature and animals, particularly mice and birds.

First thing I would do is look all over the engine bay for mouse and animal problems, namely chewed/corroded/otherwise damaged wiring, which may be the root cause of your knock sensor failure.

 

would a knock sensor make it run like that. and i already checked the fuses month ago they were fine but i checked the injectors and they were fine i think it has something to do with not getting spark.

 

It's not that you're not getting spark, the ECM is ignoring the knock sensor and setting a base timing scale as a result, running like crap. Like I said before, if you disconnect the "Set Timing" connector above the heater box and the engine runs better, I would look at the sensor next. Code 43 sets when the ECM isn't receiving the proper signal from the knock sensor (in this case, about 4.0K ohms) after about 3-5 seconds after the engine starts.