Help diagnosing a problem
Thread Starter
Melting Slicks
Joined: Jan 2008
Posts: 2,065
Likes: 1
From: Jasper Texas
Help diagnosing a problem
I though I had everything nailed down on this thing, but now I seem to have another issue. The car has a forged 383 bottom end, aluminum fast burn heads, solid roller cam, miniram intake, headers, 36lb injectors, and a few other little things.
The problem is, when I get into the upper rpms (3.5K-6.5K) there seems to be a miss, like a slight jerk, almost like it doesn't want to rev. I also get alittle popping sound like little backfires out of the exhaust when it happens.
I'm not getting any codes, and the car runs fine elsewhere. I'm thinking it may be time for some new plugs and wires.
Any other ideas guys?
The problem is, when I get into the upper rpms (3.5K-6.5K) there seems to be a miss, like a slight jerk, almost like it doesn't want to rev. I also get alittle popping sound like little backfires out of the exhaust when it happens.
I'm not getting any codes, and the car runs fine elsewhere. I'm thinking it may be time for some new plugs and wires.
Any other ideas guys?
Instructor
Joined: Aug 2006
Posts: 143
Likes: 0
From: MD
if your running 93 octane you would be ok as long as it doesnt have too much timing. 89 gas wont be enough. even with octane boosters (im not sure what octanium is) those boosters usually only raise the octane by half a point (1 point at the most) per can.
does the noise seem to change with engine load?
does the noise seem to change with engine load?
Thread Starter
Melting Slicks
Joined: Jan 2008
Posts: 2,065
Likes: 1
From: Jasper Texas
The octanium stuff is the real deal. It costs 18 dollars a can to treat 20 gallons, and raises octane by 60 points. Hopefully thats not nessecary. The noise just speeds up as the engine revs higher, but it isnt present until about 3.5K, and in park doesnt have the problem until about 4.5K.
Intermediate
Joined: Mar 2008
Posts: 48
Likes: 0
Built Small Block Probelms
My friend has a 87 383 Stroker with Dart Pro Heads.
Nothing but problems with the fuel injection./ Had a chip made, nothing bu the best. He is now dumping the fuel injection and going to a carb setup. Cant get the thing to run 100%.
We have done everything to this car. The Carb is the way to go.
Nothing but problems with the fuel injection./ Had a chip made, nothing bu the best. He is now dumping the fuel injection and going to a carb setup. Cant get the thing to run 100%.
We have done everything to this car. The Carb is the way to go.
Instructor
Joined: Aug 2006
Posts: 143
Likes: 0
From: MD
My friend has a 87 383 Stroker with Dart Pro Heads.
Nothing but problems with the fuel injection./ Had a chip made, nothing bu the best. He is now dumping the fuel injection and going to a carb setup. Cant get the thing to run 100%.
We have done everything to this car. The Carb is the way to go.
Nothing but problems with the fuel injection./ Had a chip made, nothing bu the best. He is now dumping the fuel injection and going to a carb setup. Cant get the thing to run 100%.
We have done everything to this car. The Carb is the way to go.
My Syclone ran 11 flats in the quarter mile and got 24 mpg on the highway 16mpg on the street. Thats with 85lb injectors, 22psi max boost. Truck also had NO lockup converter and a 3500 stall. You cant do that with a carb.
Safety Car
Joined: Sep 2001
Posts: 4,150
Likes: 551
From: Glenbeulah Wi
I though I had everything nailed down on this thing, but now I seem to have another issue. The car has a forged 383 bottom end, aluminum fast burn heads, solid roller cam, miniram intake, headers, 36lb injectors, and a few other little things.
The problem is, when I get into the upper rpms (3.5K-6.5K) there seems to be a miss, like a slight jerk, almost like it doesn't want to rev. I also get alittle popping sound like little backfires out of the exhaust when it happens.
I'm not getting any codes, and the car runs fine elsewhere. I'm thinking it may be time for some new plugs and wires.
Any other ideas guys?
The problem is, when I get into the upper rpms (3.5K-6.5K) there seems to be a miss, like a slight jerk, almost like it doesn't want to rev. I also get alittle popping sound like little backfires out of the exhaust when it happens.
I'm not getting any codes, and the car runs fine elsewhere. I'm thinking it may be time for some new plugs and wires.
Any other ideas guys?
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Racer
Joined: Dec 2007
Posts: 345
Likes: 0
From: Flint Michigan, #2 in unemployment, #3 in Violent crimes
if the gap is too far, the induction will "blow out" the flame kernel. in essence, making it miss due to insufficient spark. it will need more power to fire across the gap and still be able to spark under "load" or, regap to a closer tolerance and go from there.
you shouldnt need to go to a high spark system with those mods, only close the gap so the plug can fire efficiently.
Drifting
Joined: Aug 2004
Posts: 1,430
Likes: 2
The octanium stuff is the real deal. It costs 18 dollars a can to treat 20 gallons, and raises octane by 60 points. Hopefully thats not nessecary. The noise just speeds up as the engine revs higher, but it isnt present until about 3.5K, and in park doesnt have the problem until about 4.5K.
Racer
Joined: Dec 2007
Posts: 345
Likes: 0
From: Flint Michigan, #2 in unemployment, #3 in Violent crimes
Thread Starter
Melting Slicks
Joined: Jan 2008
Posts: 2,065
Likes: 1
From: Jasper Texas
i'll check the plug gaps, may just change them and make sure its correct. I'm still using the stock gm distributor and just some accel wires, don't really think I need an upgrade there.
Thanks for the help guys, i'll let yall know what I come up with.
Thanks for the help guys, i'll let yall know what I come up with.
Thread Starter
Melting Slicks
Joined: Jan 2008
Posts: 2,065
Likes: 1
From: Jasper Texas
Yesterday I went and filled up and used a can of octanium. Today I drove it for about 10 mins, then nailed it. Much better! No popping or lack of power, ran better than ever.
The original owner told me he ran premium and booster (didn't say what kind though). Maybe i'll just do this for now on.
The original owner told me he ran premium and booster (didn't say what kind though). Maybe i'll just do this for now on.