All four o2 sensors going out and fuel rail pressure low?

[bengltn]

i put a new fuel pump in my car and the check engine light went off for a few minutes, but turned back on and started bogging again... chinazones reader said that all the o2 sensors were going bad and my fuel rail pressures low.... wtf? :nonono:

 

[R-code]

What codes did it throw specifically?

~Mike~

 

[Marky]

All four O2 sensors going bad may an electrical, specifically a wiring problem. Get under the car, have a look. I had a similar problem.

 

[bengltn]

alright ill take your advice.. my friend thinks it the voltage regulator because my headlights flicker when you rev the engine, but its alot easier on the wallet to check underneath for wires than to rebuild an alternator. lol

 

[R-code]

alright ill take your advice.. my friend thinks it the voltage regulator because my headlights flicker when you rev the engine, but its alot easier on the wallet to check underneath for wires than to rebuild an alternator. lol

That's a dead alternator, had that exact problem.

~Mike~

 

[projectSHO89]

There ain't a snowball's chance in you know where that all four sensors failed at once. Code readers do NOT tell you a part is bad - they tell you the results of a specific test performed by the PCM.

Flickering lights is NOT an alternator problem, it is usually a problem in the battery voltage sensing circuit for the alternator. While annoying, it is harmless.

Go get the flippin' codes read and start over. When you come back with those results, identify the specifics of your vehicle.

 

[R-code]

Flickering lights is NOT an alternator problem, it is usually a problem in the battery voltage sensing circuit for the alternator. While annoying, it is harmless.

Why did replacing my alternator fix the flickering lights, then? Caps lock won't be necessary, if I missed something I would like to know.

~Mike~

 

[projectSHO89]

A dead alternator is one that doesn't charge the battery. The battery voltage sense problem that causes flickering or pulsating lighting is different.

THIS IS AN EXAMPLE OF USING THE CAPS LOCK KEY.

THIS is an example of a single word that is being capitalized for emphasis.

 

[R-code]

A dead alternator is one that doesn't charge the battery. The battery voltage sense problem that causes flickering or pulsating lighting is different.

THIS IS AN EXAMPLE OF USING THE CAPS LOCK KEY.

THIS is an example of a single word that is being capitalized for emphasis.

You're really not convincing me here, I had flickering lights, I replaced the alternator, the lights stopped flickering. Is the voltage regulator part of an alternator? If not, where is it located and what needs to be done to replace it? And seriously, capitalizing isn't necessary.

~Mike~

 

[2000ZxT]

What codes does it have? Im guessing all lean and slow response (possibly rich if it's trying to overcorrect). Did you replace the whole sender unit or swap the pump? If you just swapped the pump maybe it's sucking air from one of the connections inside the tank. Low fuel pressure will trip all your o2's to read faulty, they/pcm is only so smart. The operator must be smarter.

 

[FIND]

OP, start by getting the actual codes, and check for vacuum leaks.

You're really not convincing me here, I had flickering lights, I replaced the alternator, the lights stopped flickering. Is the voltage regulator part of an alternator? If not, where is it located and what needs to be done to replace it? And seriously, capitalizing isn't necessary.

~Mike~

It is attached to the alternator. New or reman alternators come with that part. You can replace that part separately as well if you only want to spend $30 instead of $150. He was trying to emphasize the difference between the two. You can see it on the back of this alternator, the little box thing on the lower left side of it.

Also, I have seen the stud that your power wire goes to on the alternator break loose (the one at the top of this image)... this can also cause flickering lights.

 

[bengltn]

that the o2 sensors are going bad, and the fuel rail pressure is low.. I only swaped the pump, not the whole unit.

 

[amc49]

Quit with your interpretation of what the codes mean, you're totally lost.

The EXACT number, or PO# is what people use here, anything else you offer is worthless. You're putting your tilt on things and obviously you're not good enough to cure your problem.

That's what he means by 'actual codes'.

 

[2000ZxT]

that the o2 sensors are going bad, and the fuel rail pressure is low.. I only swaped the pump, not the whole unit.

Your pump is most likely sucking air (from connections from the pump to the bulkhead), if a pump has a leak it will just suck air not whatever liquid you are trying to push.

You realize what the chances of 4 o2 sensors going out at one time? Basically impossible unless you ran leaded gas or something.

 

[R-code]

OP, start by getting the actual codes, and check for vacuum leaks.

It is attached to the alternator. New or reman alternators come with that part. You can replace that part separately as well if you only want to spend $30 instead of $150. He was trying to emphasize the difference between the two. You can see it on the back of this alternator, the little box thing on the lower left side of it.

Also, I have seen the stud that your power wire goes to on the alternator break loose (the one at the top of this image)... this can also cause flickering lights.

Thank you for the very thorough answer, actually learned something from this post.

~Mike~

 

[amc49]

I've seen lights flicker at highway speeds up and away from idle. The brushes were worn enough to barely be touching rotor. Changing brushes alone fixed the problem, that on a model that allowed such.

 

[bengltn]

sorry guys, havent had the time to get on here for a while. but i got all the codes it throws here:
P0190
P0135
P0141
P0155
P0161
P0174
P1000

 

[BrApple]

P0190 Fuel Rail Pressure Sensor Circuit Malfunction


P0135 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0141 02 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0155 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0161 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)

P0174 System too Lean (Bank 2)

sounds like you have a blown fuse for the O2 sensor heater circuit, I believe there is only one.

not sure what the P0190 means. do you have a late 99 or 2k car?

the P0174 could indicate a O2 sensor. However with a popential fuel issue I am not sure about that at the moment.

 

[SVT Doood]

You need to go back and check the work you did on the fuel pump, and make sure you did that correctly. Lotsa people only replace the fuel pump and not the whole contraption...that's not an issue. I changed mine several months ago...and seem to recall a few small tubes that need to be connected properly for operation. Then reset PCM and see what codes come up.

 

[bengltn]

BrApple, Its a 2000 svt... im guessing the fuse would be in the fuse box?

SVT Doood, I'v taken it apart twice and tried to see if that helped, but its still no worky. So unless i failed twice on getting that thing in then it isnt the issue