Beretta.net

I have spotted some things I need to due, but if they don't work Ill just add on.

Specs: 1995 3100 V6 Chevy Beretta: The car runs I guess you would say rough.  When I start it up it will idle fine SOMETIMES.  When it does act up its like someone is stepping on the pedal and then lets off. Now when I stop or slow down the car will jerk and and most of the time die. I have 2 video clips of when it acts up.





When I start the car I get a fault.  Ignition Control 24X Signal Circuit Error.  On this error I have done all the steps on the troubleshoot.  On the first step it says to hook up a Tech Scan tool. I did with a Mac reader and when the engine is running the 24X signal RPM should be the same as the engine speed up to 1200RPMs. At 700 RPMs - 800 RPMs I was getting a constant 138 from the CTRL Signal.  It came down to replacing the sensor.  I did that and it did nothing.  If anything it made it worse.  Well Then I omhed out all the wires from the connector back to the PCM. I have also changed the front spark plugs. Didnt change. Oh and after I changed my 24 X sensor I went to work to get the reader well I guess are other shop has it.  I am sure there is now way I can read faults unless I have a reader.  After I changed that sensor I pulled the ground off the battery to reset the computer and yeah nothing changed. This Fault will not throw a light.

PCM (Blue)
C21 to pin B (0.5 Ohms) Signal Wire
C18 to pin C (2.0 Ohms) Ref. Low for cam and crank pos.
Pin A on Crank sensor to Pin A on Camshaft sensor. (0.5 Ohms)

I also had a PCM from a 1994 Z26 3100 and I stuck her in there and nothing changed.


Now when she sits and runs for about 2 - 3 min. she will throw a fault. DTC 44 Heated Oxygen Sensor (H02S) Circuit (Lean Exhaust Indicated)  I have done nothing to this Fault.  I think it has something to due with the next Fault.  This fault with throw the light. ÂÂÂ

Now I used a Mac reader from work and It said I have an injector fault: "A Fault reported by the ECM than an injector wire is shorted or has low resistance") This Fault does not throw a light.

Omhed Injectors:
I omhed from the black plug right next to the Alt. I am thinking I should go from the PCM.  But I got 13.3 Omhs +/- 0.1


I need help!  If needed I will scan my manuals but it wont be till tommrow night when I get to work.

Anything new on this?

Well it runs a little better. it does not die as much but still runs rough.  I am thinkin its the o2 sensor.  I am going to go through the steps before i replace it.  Maybe thursday...

EGR checked out good? Should the O2 be working after only 2 minutes? I think(just like you) that there is something else going on, but I'm not sure what it is. I also have a 95 3100, so I be watching this topic.

(Money pit Beretta @ Sep. 17 2008,21:31)QUOTEEGR checked out good? Should the O2 be working after only 2 minutes? I think(just like you) that there is something else going on, but I'm not sure what it is. I also have a 95 3100, so I be watching this topic.
I am sure the EGR is junk.  Now that you say that. I used to have a fault for my EGR and now I don't.  I don't know really anything about the O2.  I figured it works all the time.  Adjusting for fuel and air mix.  I was thinkin its messed up and thinks its low on fuel so i adds more well then its to much and idle goes up. Then it slows down the fuel and the RPMs drop.  Its what I am thinkin is going on.

Ok had to look it up(the o2). The old ones took a long time to heat up(like my 90). The heated ones do it in a short time. Sorry, have to cut it short on this. Well, if the millivolts are less than 450 the O2 will say it's lean all around(not just one cylinder). If the EGR is on it will put exhaust gas in to occupy volume and that should not be going on at idle. That would give it a rough idle and does end up reducing the total A/F mixture amount. This info is from Chilton's and How to Tune and Modify Chevrolet Fuel Injection. I have read these and a few more books, but it was a long time ago. If this doesn't help I can read them again to get the max info.

Wow Cool well i have some factory manuals and I will check it out.  Thanks for the info.

Yea did some searching on Bnet and found a topic and well I think my first step is going to be clean my EGR.  I hope I can do this tonight at work.  I didnt work on my car at all kinda had problems with a female.

Sure man, just tell me if you don't find what your looking for in the manuals. Problems, that sounds like a new project(lol), my project on that lasted 10 years and is going very well now.

This just a note on what I did today when i got into work.  I found a reader and looked and I only have 1 Fault.  44 again the O2 Sensor.

Well I am glad the crankshaft sensor one cleared.  I started to look at the A/F and normal it would run 14% then when it started to act up it went to 15%.  I looked at the milli volts on the O2 when the key is off.  It would be at a steady 80 but would jump tp 453. but then right back to 80.  Also I notice when the engine was acting up the IAC was jumping around.  I still plan on pulling the EGR tonight maybe at 2 am or so.

Did you check the O2 volts when the engine running? That's when you would get a real reading into what's going on. The computer could be telling the IAC to do that, but it also may be going out. Man, that why I got all those books, it's had to tell what is bad and what is just affected by what's going on.

Well something else that was an easy fix.  I went to Napa to buy an 02 sensor so when I did work on the car and it needed one id have one.  Well the guy there knows me from always going in there and talking circles around this honda kid.  Plus buying all these sensors.  He said well did you check your MAP sensor. I laughed and said shut up old man.  Welllllll   I think you can see where this is going.  I went back home and started to change my front brakes and well it was getting late so I called it a night and started to shut up shop.  I just did a quick check over of the engine and saw something.  My line coming off of the Fuel Regulater that goes into the map sensor had broke.  Well I put some tape on it and it ran fine.  I know its a temp fix but wow I was happy and mad.  So now I got to tell that guy he was right.  I do think that the Crankshaft sensor was bad.  Oh well I didnt check my lines like a should and I payed for it.

That's great man! The thing that gets me is I'm always telling somebody to check for a vac leak when they have trouble. It's so easy to get all into this sensor or that sensor is bad. Well, most of the time I'm wrong on the vac leak(guess I missed a chance to be right ).