LT-4 with black smoke??
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,363
Likes: 429
From: Birmingham Al
LT-4 with black smoke??
My 96 LT-4 was sitting for 60 days ( Have too many can't drive them all,this one needs new home ) and got in and black smoke , ran it for a little wile I guess a little better..Ran great when last drove it ??? Something stuck ..Help... thanks...
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,363
Likes: 429
From: Birmingham Al
I put some techron in it and drove it 50 miles runs better but a low speed still ruff ,I can wind it up and it goes like a rocket .. I guess a big tune up is in the cards... thanks...
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,363
Likes: 429
From: Birmingham Al
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,363
Likes: 429
From: Birmingham Al
Thanks ,I am going to pull out a few plugs and take a look.. I runs way better after the techron so that's telling me something in the fuel sys. I thinking injector , will just haul after around 40 mph ,I had it on 130 MPH and was ready for more ? About the only thing left Org. are the injectors all else is new .It's been tuned WOT ,I realy don't know what that has to do with it ,I don't how that works on the front ones?,the back O2s are not even installed ..I let it sit for a wile I guess not good ..Thanks..
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Heel & Toe
Joined: Nov 2011
Posts: 16
Likes: 0
From: Tulsa OK
Thanks ,I am going to pull out a few plugs and take a look.. I runs way better after the techron so that's telling me something in the fuel sys. I thinking injector , will just haul after around 40 mph ,I had it on 130 MPH and was ready for more ? About the only thing left Org. are the injectors all else is new .It's been tuned WOT ,I realy don't know what that has to do with it ,I don't how that works on the front ones?,the back O2s are not even installed ..I let it sit for a wile I guess not good ..Thanks..
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,363
Likes: 429
From: Birmingham Al
Looks ok, I checked it out ,both gauges seem to be the same temp and as far as I can tell .. I thinking fuel sys.. but in same Techron runs a little better and no black smoke on the rear bumber as befor..Just ruff at low speed..I am going to check the injectors out they have 150,000 miles opn them ,I have never cleaned them ? I guess now is a good time for that..
Racer
Joined: Dec 2007
Posts: 312
Likes: 0
From: San Antonio Texas
OK.....this can be a problem UNLESS you had the rear O2's tuned out via the PCM.
Did you?
It may be best to have them reconditioned versus you just trying to "clean" them. There should be somebody out in your area that does this service.
Here in San Antonio, there is "Fuel Injection Specialties" that does this work; turnaround = a couple days or so....... If you can't get them serviced in Houston, you could send your to FIS.....
http://www.fuelinjection.com/injector.html
KW
Did you?
Here in San Antonio, there is "Fuel Injection Specialties" that does this work; turnaround = a couple days or so....... If you can't get them serviced in Houston, you could send your to FIS.....
http://www.fuelinjection.com/injector.html
KW
Last edited by Kevin Woods; Jul 8, 2013 at 12:14 PM.
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,363
Likes: 429
From: Birmingham Al
OK.....this can be a problem UNLESS you had the rear O2's tuned out via the PCM.
Did you?
It may be best to have them refurbished versus you just trying to "clean" them. There should be somebody out in your area that does this service.
Here in San Antonio, there is "Fuel Injection Specialties" that does this work; turnaround = a couple days or so....... If you can't get them serviced in Houston, you could send your to FIS.....
http://www.fuelinjection.com/
KW
Did you?
It may be best to have them refurbished versus you just trying to "clean" them. There should be somebody out in your area that does this service.
Here in San Antonio, there is "Fuel Injection Specialties" that does this work; turnaround = a couple days or so....... If you can't get them serviced in Houston, you could send your to FIS.....
http://www.fuelinjection.com/
KW
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,363
Likes: 429
From: Birmingham Al
Thanks for asking. Not yet, I am right now cleaning out a place to work on it . The garage is full I have to move vets around to have a place to work on them and get some out of the way ,Late this aftermoon or first thing in the morning start looking.. First thing is pull a plug or two take a look them pulling all the injectors and clean check if all working then clean throttle body check wires .It runs good for about a mile then runs bad up to about 50 mph then hauls butt ??? Should take about a day or two to check it all out ... If all looks good I will have to call my tuner and sak about the O2s ,don't have a clue what WOT does to the O2s ,I know the back ones or not installed ,I hopeing this will be easy to find ...RIGHT.... All but the injectors are new the injectors are ORG...OPIT new ,wires ETC... ..Thanks for asking...
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
If I were diagnosing my car, I would take all engine readings with my Tech 1 and compare the readings to a base line or what is a proper measurement would be. Then that might give you a direction if anything is way out of tolerance. Sometimes a Tech 1 helps and sometimes is doesn't. But I understand to do this a Tech 1 or similar scanner need to be available and a knowledge of using it is required.
Guessing and trial and error can be time consuming especially on some of these kind of symptoms.
Guessing and trial and error can be time consuming especially on some of these kind of symptoms.
Heel & Toe
Joined: Nov 2011
Posts: 16
Likes: 0
From: Tulsa OK
Look at your o2 readings. Tech 1 is for obd 1. I thought you had a 96 obd 2 so you would need a tech2. Could be you run fine until closed loop. If it starts fine and then goes to hell it makes sense that you have a sensor malfunctioning. It would not be a problem at more throttle because you're engine isn't drowning in its own pudding.
Thread Starter
Safety Car
Joined: Dec 2009
Posts: 4,363
Likes: 429
From: Birmingham Al
Thanks for the input , I don't have a scanner or tech 1 or 2 and it is a 96 LT-4 ..It needs to be gone over anyway ,It's been a wile ,the injectors need to be looked at, just sitting around is not good for it a few things need to be cleaned ..After I check a few things out and it's still not right I go get it scanned ,there is a shop in town ( Houston ) that can check it.. One of the O2s may be bad ...
Le Mans Master
Joined: Jan 2006
Posts: 5,621
Likes: 206
From: Orlando FL
Look at your o2 readings. Tech 1 is for obd 1. I thought you had a 96 obd 2 so you would need a tech2. Could be you run fine until closed loop. If it starts fine and then goes to hell it makes sense that you have a sensor malfunctioning. It would not be a problem at more throttle because you're engine isn't drowning in its own pudding.
(Tech 1 and Tech 1A uses different interface cables).
If you have the individual cartages (modules) like 88 to 95, then you will not be able to test a 96 car.
Last edited by pcolt94; Jul 12, 2013 at 10:31 AM.