Florida tuners chime in please
#1
Florida tuners chime in please
long story short, i had a 98 ls1/4L60e in my 87 Firebird until i spun a bearing in December and bought a 5.3 to replace it.
I was hoping that when i went to fire it over, my ls1 computer (which had a little tuning done to it) would be able to compensate enough to run. I didnt think it was going to run well, but i just wanted it to move. Right now It backfires at idle and sounds like its missing and has a healthy amount of black smoke exiting the tailpipes.
some things about the setup
99+ fbody computer and harness. uses all the sensors off the ls1 block.
LM7 with an ls6 cam, ls6 intake, 853 heads, long tubes, and uses the stock 98 injectors.
whats the easiest/cheapest decision from here?
I was hoping that when i went to fire it over, my ls1 computer (which had a little tuning done to it) would be able to compensate enough to run. I didnt think it was going to run well, but i just wanted it to move. Right now It backfires at idle and sounds like its missing and has a healthy amount of black smoke exiting the tailpipes.
some things about the setup
99+ fbody computer and harness. uses all the sensors off the ls1 block.
LM7 with an ls6 cam, ls6 intake, 853 heads, long tubes, and uses the stock 98 injectors.
whats the easiest/cheapest decision from here?
#2
FormerVendor
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Join Date: May 2003
Location: Jacksonville, Fl
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What did you do with the three interconnects behind the passenger side kick panel? The 98 Fbody has three, 99+up have two.
We could get you on the right path with a mail order for $125 shipped inside of Florida.
Doc
We could get you on the right path with a mail order for $125 shipped inside of Florida.
Doc
#4
On The Tree
iTrader: (19)
it'll run ok enough to check for leaks and what not
I did something similar with mine and the only real issue i had was horrible mileage until I got it dyno tuned.
I wouldn't daily drive it without a tune though.....
Glad to see you decided to keep the car. I was really wanting to buy it, but I have 4 cars now and don't need another.... lol
-jason
I did something similar with mine and the only real issue i had was horrible mileage until I got it dyno tuned.
I wouldn't daily drive it without a tune though.....
Glad to see you decided to keep the car. I was really wanting to buy it, but I have 4 cars now and don't need another.... lol
-jason
#6
FormerVendor
iTrader: (10)
I am guessing the 98 engine in the 87 ran well before hand. My question is did you swap all of the sensors off the old engine over to the new engine (MAP, IAT, MAF, Coolant Temp, Crank Sensor, Cam Sensor, etc.) ??
Somtimes when you mix and match sensors with the wrong computer things can go wacky. If you did swap everything over, it should run at least better then you describe. If it is backfiring and huffing out black smoke, I would check:
1) MAP sensor getting vacuum, this would show excessive load at idle.
2) Coolant temp sensor unplugged or broken. This would read -38* and make her run rich.
After that ther is what Jimmy mentioned also. If you can scan and see if there are any codes or at least see what the MAP and coolant temp it is reading and go from there.
Hope this helps.
Mike Norris
Somtimes when you mix and match sensors with the wrong computer things can go wacky. If you did swap everything over, it should run at least better then you describe. If it is backfiring and huffing out black smoke, I would check:
1) MAP sensor getting vacuum, this would show excessive load at idle.
2) Coolant temp sensor unplugged or broken. This would read -38* and make her run rich.
After that ther is what Jimmy mentioned also. If you can scan and see if there are any codes or at least see what the MAP and coolant temp it is reading and go from there.
Hope this helps.
Mike Norris
#7
10 Second Club
iTrader: (26)
The car was originally tuned with the 98 injectors so that is a moot point. However I did mention that it would be rich strictly for the cam/ci differences. If he doesnt order a scan gauge we can make another cable up so he can use my aeroforce scan gauge to monitor coolant/map.
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#8
i'm so dumb. seriously i dont even want to put this up on tech right now....
little wire pulling and brain scratching led to finding one of the coil harnesses is on backwards. that sure would cause a misfire if i ever heard one. I'll post when its running tomorrow
little wire pulling and brain scratching led to finding one of the coil harnesses is on backwards. that sure would cause a misfire if i ever heard one. I'll post when its running tomorrow