procharged 96 barely runs
10-16-2017, 08:49 PM
#1
Instructor
Thread Starter
procharged 96 barely runs
this is a total shot in the dark as I know tons of thinks could be the issue.. But I have a 1996 procharged lt1 that has a replaced motor in it from a ton of spun barrings, anyways it never seems to want to start... and if I can get it to start it will run for like 5/10min then start to run pretty rough and die out, then wont start again, seems like its draining the battery out? but I dont know where I would even start with that issue. i've read before that could be a bad opti, but im wondering if anyone has any other opinions? maybe a bad tune thats killing it?
10-17-2017, 08:02 AM
#2
Le Mans Master
Did combination ever run correctly? If procharger is disabled will it run? Condition of plugs, trouble codes? Can you monitor engine data?
10-17-2017, 10:31 PM
#4
Instructor
Thread Starter
I have never had it running properly, traded one project for another apparently lol, I have seen a video of it running but who knows what happened between then and when I got it, plugs have been replaced since I bought it but I feel are pretty beat up for how hard it runs, Havent checked codes recently as I dont remember how to do it atm haha and no not really any way to monitor data
10-17-2017, 11:35 PM
#5
Le Mans Master
Obd2 code readers and scanners aren't that expensive. If it wasn't back dated to a 95, some tuners don't like obd2 so they roll it back to obd1. I would look for a tuner for help. Never running right leaves lots of areas to look. If it will run for 5-10 mins before it quits data may show something.
10-18-2017, 08:23 PM
#7
Instructor
Thread Starter
Oh I didnt think scanners really worked on what im assuming is obd1 with it being a 96, I dont really know how to bring them up on the dash, do I have to be able to start it for them to read/show?
10-19-2017, 02:20 PM
#9
Team Owner
Member Since: Mar 2001
Location: Boston, Dallas, Detroit, SoCal, back to Boston MA
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Here's how they work on my 1995
http://s242.photobucket.com/user/swi...?sort=3&page=1
video I found, different year year
http://s242.photobucket.com/user/swi...?sort=3&page=1
video I found, different year year
10-22-2017, 04:50 PM
#11
Instructor
Thread Starter
tried putting boosters on it today to get some codes, wouldnt take any power, Wouldnt even get sparks on my cables which makes me think my cables might be the problem there, but will I still have stored codes when the car has been dead as a rock for months on end? or will I have to get it to fire up and see if anything pops
10-27-2017, 09:02 PM
#12
Instructor
Thread Starter
Put a new battery in it today, and it gets power, and it would start for 2 seconds then die, I fucked with the fuel a touch and it stayed running today, but started backfiring a lot so I had to turn it off.. scanned it and no codes. Don't know if that's cause if the battery change or if actually no codes? Any ideas on where to go next? as with it backfiring like that I cant let it run.. not to mention its open headers atm so its extremely loud..
10-27-2017, 09:47 PM
#13
Put a new battery in it today, and it gets power, and it would start for 2 seconds then die, I fucked with the fuel a touch and it stayed running today, but started backfiring a lot so I had to turn it off.. scanned it and no codes. Don't know if that's cause if the battery change or if actually no codes? Any ideas on where to go next? as with it backfiring like that I cant let it run.. not to mention its open headers atm so its extremely loud..
The little I know makes me think supercharger = timing/ tuning / fuel adjustments needed.
Time to start reading or just take it to someone that has a clue how to get it going with out destroying something.
10-27-2017, 10:15 PM
#14
Instructor
Thread Starter
Always worries me send it to get tuned, not the tuning part, but the effort that goes into setting up a time/date, renting a trailer, getting it there, just to find out something is wrong that needs to be fixing before tuning can be done you know..
10-27-2017, 11:18 PM
#16
Instructor
Thread Starter
Have not done a compression test yet due to how annoying the SP's are to get at, the motor has been out before and been resealed with some parts replaced (don't remember what lmfao) and all reinstalled with valve done and checked by a crazy gm tech and haven't been touched since.. so I assume would be okay?
10-28-2017, 01:20 AM
#18
Instructor
Thread Starter
10-28-2017, 10:22 AM
#19
In your particular case - I'm afraid that you need to start from the very beginning....
First - do you know if the injectors are factory original - or if they were changed to larger ones (the OE injectors won't support the power levels that the supercharger can easily create). If larger injectors were installed - the PCM software has to be modified to run with the larger injectors. As other posters have said - depending on who worked on the car and when - they may have substituted an earlier PCM, which they better understood. If you hook up a OBDII code scanner - it should work with a 1996 car - if it doesn't I'd suspect the PCM has been swapped out for an earlier one. The 96 uses a Mass Airflow sensor, and that is what you would want on a supercharged car - but again - they have flow limitations, and the previous owner may have either discarded it or changed it to one that can handle higher flow rates - which would have also required PCM software changes. Did the previous owner do things to "improve" fuel flow - to support the higher power levels, or is the fuel system stock ?? You should check fuel pressure while running to verify.
So - if I were in your shoes - I'd start at the very beginning...
Verify the ignition system is making a good spark, and check voltage while running. If both of those seem good - I would try to look at the fuel pressure, and at Air Fuel ratio while idling, and while running at steady state (no load). If you don't have the ability to do this - you're probably going to need to get the car to a tuner who can.
First - do you know if the injectors are factory original - or if they were changed to larger ones (the OE injectors won't support the power levels that the supercharger can easily create). If larger injectors were installed - the PCM software has to be modified to run with the larger injectors. As other posters have said - depending on who worked on the car and when - they may have substituted an earlier PCM, which they better understood. If you hook up a OBDII code scanner - it should work with a 1996 car - if it doesn't I'd suspect the PCM has been swapped out for an earlier one. The 96 uses a Mass Airflow sensor, and that is what you would want on a supercharged car - but again - they have flow limitations, and the previous owner may have either discarded it or changed it to one that can handle higher flow rates - which would have also required PCM software changes. Did the previous owner do things to "improve" fuel flow - to support the higher power levels, or is the fuel system stock ?? You should check fuel pressure while running to verify.
So - if I were in your shoes - I'd start at the very beginning...
Verify the ignition system is making a good spark, and check voltage while running. If both of those seem good - I would try to look at the fuel pressure, and at Air Fuel ratio while idling, and while running at steady state (no load). If you don't have the ability to do this - you're probably going to need to get the car to a tuner who can.
10-28-2017, 03:10 PM
#20
Instructor
Thread Starter
In your particular case - I'm afraid that you need to start from the very beginning....
First - do you know if the injectors are factory original - or if they were changed to larger ones (the OE injectors won't support the power levels that the supercharger can easily create). If larger injectors were installed - the PCM software has to be modified to run with the larger injectors. As other posters have said - depending on who worked on the car and when - they may have substituted an earlier PCM, which they better understood. If you hook up a OBDII code scanner - it should work with a 1996 car - if it doesn't I'd suspect the PCM has been swapped out for an earlier one. The 96 uses a Mass Airflow sensor, and that is what you would want on a supercharged car - but again - they have flow limitations, and the previous owner may have either discarded it or changed it to one that can handle higher flow rates - which would have also required PCM software changes. Did the previous owner do things to "improve" fuel flow - to support the higher power levels, or is the fuel system stock ?? You should check fuel pressure while running to verify.
So - if I were in your shoes - I'd start at the very beginning...
Verify the ignition system is making a good spark, and check voltage while running. If both of those seem good - I would try to look at the fuel pressure, and at Air Fuel ratio while idling, and while running at steady state (no load). If you don't have the ability to do this - you're probably going to need to get the car to a tuner who can.
First - do you know if the injectors are factory original - or if they were changed to larger ones (the OE injectors won't support the power levels that the supercharger can easily create). If larger injectors were installed - the PCM software has to be modified to run with the larger injectors. As other posters have said - depending on who worked on the car and when - they may have substituted an earlier PCM, which they better understood. If you hook up a OBDII code scanner - it should work with a 1996 car - if it doesn't I'd suspect the PCM has been swapped out for an earlier one. The 96 uses a Mass Airflow sensor, and that is what you would want on a supercharged car - but again - they have flow limitations, and the previous owner may have either discarded it or changed it to one that can handle higher flow rates - which would have also required PCM software changes. Did the previous owner do things to "improve" fuel flow - to support the higher power levels, or is the fuel system stock ?? You should check fuel pressure while running to verify.
So - if I were in your shoes - I'd start at the very beginning...
Verify the ignition system is making a good spark, and check voltage while running. If both of those seem good - I would try to look at the fuel pressure, and at Air Fuel ratio while idling, and while running at steady state (no load). If you don't have the ability to do this - you're probably going to need to get the car to a tuner who can.