really strange issues, multiple

[1995Z/28]

I havent driven the camaro for a couple of weeks and decided tuesday that i was gonna take it for a drive. I went out and fired it up and backed out of the drive way and put it in drive. got half way down the street and realized it was taking an awfully long time in first, i let off the gas and it shifted into 2nd, went to the station around the corner from my house to get some gas in it, shut it off put some gas in it, started it back up but it didnt seem to fire right up, had to hit it twice before it started. took off from the station and realized it was wanting to stay in first again, but simply letting off the gas did not make it shift so i pulled the shifter down to first and poped it into second but after it shifted out of first it was like it was in neutral, i forgot to mention, when i first left the house the "service engine soon" light poped on for some reason but when i re-started the car to leave the gas station, it was off. anyways, limped it home and checked the trans fluid, full, and bright pink. let the car sit for a while and went out to take it for another ride to see if it just had some gremblin from sitting. this time when i went to start it it acted like it was only running on 4 cyl. shaking back and no power, shut it off and restarted it and it was running on all 8 again.went down my road and the light came back on and the tranny did the same thing again. got it home and shut it off and tried to restart it and it was ding nothing, the dash lights would come on but it would not crank. tried it a few times and wiggled the key, tilited the column up and down. and sometimes it would start and sometimes nothing. Im way outta my league with this one guys. where do i even start? im going to hook a scan tool up to it at lunch today when i go home to eat. to see what was throwing the sevice engine soon light. this is totally out of the blue, the last time i drove the car it was running fine. but it is experiencing all of these random issues all at once and im really leaning toward a sensor, a switch, somthing, maybe the PCM took a puke??? i have NO idea?

[LS1Phoenix]

A rat got in there and started chewin sh1t up...lol!

[1995Z/28]

A rat got in there and started chewin sh1t up...lol!

dear God, I hope not!
so I ran a diagnostic scan on it at lunch. it had 2 codes. a code 18 and a code 24 (one of them was something like fuel injector pulse signal) and the other was , I THINK, vehicle speed sensor signal...not positive though.

[hoogiesngrinderz]

18 - Injector driver circuit voltage to PCM was wrong for 4 seconds.
24 - Vehicle speed was 0 MPH when engine speed was between 900 and 3000 RPM and throttle position angle was less than 2% for 5 seconds.

Anyone thinking a bad ground?

[1995Z/28]

18 - Injector driver circuit voltage to PCM was wrong for 4 seconds.
24 - Vehicle speed was 0 MPH when engine speed was between 900 and 3000 RPM and throttle position angle was less than 2% for 5 seconds.

Anyone thinking a bad ground?

bad ground where?
where do i start looking?
could either of these codes be caused by anything in my column if it is loose? my tilt mechanism is loose in my column a little bit
and could code 18 be the reason for my higher rpm sputter i was experiencing?
one more? i had a 12V car charger plugged into the cig lighter socket this whole time, could the slight power draw from this have dropped the system voltage down to a point to confuse the PCM?

[hoogiesngrinderz]

bad ground where?
where do i start looking?
could either of these codes be caused by anything in my column if it is loose? my tilt mechanism is loose in my column a little bit
and could code 18 be the reason for my higher rpm sputter i was experiencing?
one more? i had a 12V car charger plugged into the cig lighter socket this whole time, could the slight power draw from this have dropped the system voltage down to a point to confuse the PCM?

Check the grounds on the back of the heads and to the firewall if present (I don't know all the LT1 grounds). The column harness could be getting bad. PITA to trace down where the weak connections are (connector is easy, in the column...yeah). A weak 12v could cause the flutter, but a car charger wouldn't cause that

[1995Z/28]

Check the grounds on the back of the heads and to the firewall if present (I don't know all the LT1 grounds). The column harness could be getting bad. PITA to trace down where the weak connections are (connector is easy, in the column...yeah). A weak 12v could cause the flutter, but a car charger wouldn't cause that

okay, ill get it to my buddies shop on the lift an check grounds. any idea where to find a schematic that will show where all the grounds are? if i just make a new ground strap and mount it from the head to the fire wall, would that render any existing bad grounds useless? or do the seperate systems have their own grounds in various locations?

[hoogiesngrinderz]

I can find schematics but they don't say where they are located. My Camaro (TPI) had a ground point on the back of each head, the driver side had a strap from the ground stud to the firewall. The battery ground cable is connected to the engine block, a smaller wire wire from the ground terminal is attached to the core support (redundant grounds for the body)

There are two wires to each injector wires. One is hot all the time, fused in the fuse box (either through INJ 1 or INJ 2 fuse). The other goes to the PCM and is connected to an injector driver. The injector drivers are essentially ON/OFF switches to ground...if the ground that they are connected to is so-so, well, the injectors can have trouble - especially at higher RPM.

[1995Z/28]

I can find schematics but they don't say where they are located. My Camaro (TPI) had a ground point on the back of each head, the driver side had a strap from the ground stud to the firewall. The battery ground cable is connected to the engine block, a smaller wire wire from the ground terminal is attached to the core support (redundant grounds for the body)

There are two wires to each injector wires. One is hot all the time, fused in the fuse box (either through INJ 1 or INJ 2 fuse). The other goes to the PCM and is connected to an injector driver. The injector drivers are essentially ON/OFF switches to ground...if the ground that they are connected to is so-so, well, the injectors can have trouble - especially at higher RPM.

that would definitely explain the high end sputter. where did you find the schematics, i havent had much luck. as long as it shows where in the system the grounds are found in relation to the "branches" of the harness, and what ground goes to where, i can chase them down. and just so im understanding clearly, the injector drivers all share a common ground? how many grounds does it show in the system?

[hoogiesngrinderz]

Or it could be bad +12v from the column.

I use PCM pinout diagrams, it will not show where the wire goes or what branch it is in. It just shows that pin A2 & C32 (black/white wires) and A18 & D1 (tan/white wires) are PCM ground

[1995Z/28]

so it IS entirely possible that most of these issues are stemming from the column being a little loose? along with possible some less than perfect ground wires.?

[hoogiesngrinderz]

Yes. It could even be a bad ignition lock cylinder. The PCM gets key on power and VATS key resistance value through the cylinder lock. The injectors/fuel pump/MAF/TDM(security module) get their +12v source through the cylinder lock as well

[1995Z/28]

Yes. It could even be a bad ignition lock cylinder. The PCM gets key on power and VATS key resistance value through the cylinder lock. The injectors/fuel pump/MAF/TDM(security module) get their +12v source through the cylinder lock as well

okay, then ill need to get into that column and tighten up the bolts. becuase it does seem that when i wiggle the column the car will start again or sometimes when i tilt the column up and down. ill start there. THANKS!