misfire or hitting rev limiter?
Thread Starter
Launching!
Joined: Jan 2004
Posts: 213
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misfire or hitting rev limiter? i was almost certain that it was my tranny that had crapped out but i went the track this past friday and something unusal happened spark's or fire was coming out of where the cutout is under the car when the car was missfiring for about 1/2 to a 1 second of pure hissitation .\
what do guy's think is that a missfire or is it the tranny hitting rev limiter ?
i have a 94z28 automatic trans
i have reviewed numerous of time's through my camcorder
what do guy's think is that a missfire or is it the tranny hitting rev limiter ?
i have a 94z28 automatic trans
i have reviewed numerous of time's through my camcorder
TECH Senior Member
Joined: Jun 2003
Posts: 9,339
Likes: 3
From: NYC metro area
umm... where were you in the RPM range? I'm assuming up top? I don't really understand your post, are you sure it was a backfire and not you dropping your tranny? I'm assuming the tranny shifts fine now that you're asking us this question?
Well if it was a backfire, In my opinion a misfire is most likely since the absence of spark would dump a decent amount of unburnt fuel into your exhaust. The unburnt fuel particles in your exhaust would then ignite due to heat, and cause the backfire.
What mods are done to your car? How high do you rev? Does your ignition miss often?
Well if it was a backfire, In my opinion a misfire is most likely since the absence of spark would dump a decent amount of unburnt fuel into your exhaust. The unburnt fuel particles in your exhaust would then ignite due to heat, and cause the backfire.
What mods are done to your car? How high do you rev? Does your ignition miss often?
Thread Starter
Launching!
Joined: Jan 2004
Posts: 213
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it's in the high rpm's right before it's time for the next gear to shift.
well it shift's perfectly when driving normal but on full throttle it hisitates for almost a complete second and then it shift's. would you call that a missfire?
sorry for not making sense i have very poor education being brought up in a small town. i rely on you guy's on figuring out my car problems since the nearest profesional mechanic that knows about working on camaro's is a about an hour away.
my mod's are:
230/236 cam at 112 lsa with 1.6 roller rocker's installed by me.
tci ssf 3500 torque coverter
header's and a bunch of common bolt on's
one thing though my water pump is covered with oil?
well it shift's perfectly when driving normal but on full throttle it hisitates for almost a complete second and then it shift's. would you call that a missfire?
sorry for not making sense i have very poor education being brought up in a small town. i rely on you guy's on figuring out my car problems since the nearest profesional mechanic that knows about working on camaro's is a about an hour away.
my mod's are:
230/236 cam at 112 lsa with 1.6 roller rocker's installed by me.
tci ssf 3500 torque coverter
header's and a bunch of common bolt on's
one thing though my water pump is covered with oil?
TECH Senior Member
Joined: Jun 2003
Posts: 9,339
Likes: 3
From: NYC metro area
Hmm...
Sounds to me like your tranny is about to buy the farm. If it's delaying a shift it might be a slip that you're experiencing. If there's oil on your waterpump, perhaps some spilled or there's a leak somewhere. It could have gotten to the opti and caused a misfire...
A misfire sounds like a slight pop coming from your motor and a delay in acceleration. It happens when no spark gets to the cylinder that i supposed to be ignited, usually due to a plug, wire, or opti. How's your gas mileage?
I really don't have any solutions to the tranny, could be a quirk or something due to the TC, I'm not sure. I'll let one of the other guys handle that....
Sounds to me like your tranny is about to buy the farm. If it's delaying a shift it might be a slip that you're experiencing. If there's oil on your waterpump, perhaps some spilled or there's a leak somewhere. It could have gotten to the opti and caused a misfire...
A misfire sounds like a slight pop coming from your motor and a delay in acceleration. It happens when no spark gets to the cylinder that i supposed to be ignited, usually due to a plug, wire, or opti. How's your gas mileage?
I really don't have any solutions to the tranny, could be a quirk or something due to the TC, I'm not sure. I'll let one of the other guys handle that....
Thread Starter
Launching!
Joined: Jan 2004
Posts: 213
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well how you defined it, i know it's not a missfire it sound's like tatatatatata but say it really fast 
..
if there was just a way for you to here a sound clip or the video. thank's on the reply.
gas mileage suck's after the cam! well i also pay $2.45 a gallon here in cali
.. if there was just a way for you to here a sound clip or the video. thank's on the reply.
gas mileage suck's after the cam! well i also pay $2.45 a gallon here in cali
Teching In
Joined: Dec 2003
Posts: 19
Likes: 0
From: Cincinnati Ohio
hey my 93 auto does this... When I go from a complete stop and just matt the gas it smacks the rev limiter at 5700 and hesitates to click second??? I've got a B&M shift kit new sprag and clutches, and a vigi 3600. I actually flushed the tranny recently and it seemed to help a little bit but it still loves that rev limiter.
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maybe after you get the tranny fixed if it's needing work get your pcm tuned for whatever performance mods you've done, if you haven't already. Get the rev limited adjusted from 5700 to 6700, also check your 02 sensors.
Thread Starter
Launching!
Joined: Jan 2004
Posts: 213
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i got pcm for less tuning , i my revlimiter is set shift at 6400 rpm.
i'm buying a used tranny off a guy from the board is there any thing i could do the tranny so it could be heavy duty. he also including a electronic shift kit not b&m.
i'm just going to be dissapointed if it's not the tranny but i guess i could sell it. i paid over 1400 to get rebuild 30,000 miles ago which has no more warranty. but i guess i could alway's sell it.
could it be my tci converter it's a 3500 i think
i'm buying a used tranny off a guy from the board is there any thing i could do the tranny so it could be heavy duty. he also including a electronic shift kit not b&m.
i'm just going to be dissapointed if it's not the tranny but i guess i could sell it. i paid over 1400 to get rebuild 30,000 miles ago which has no more warranty. but i guess i could alway's sell it.
could it be my tci converter it's a 3500 i think
TECH Senior Member
Joined: Jun 2003
Posts: 9,339
Likes: 3
From: NYC metro area
I would suggest replacing it with a used Borg-Warner T-56 from an LT1 car. They're far more stout than the LT1 4L60E and quite a few enthusiasts believe that they are far stronger than the Tremec T-56 found in the LS1 cars. There is a guy named Taner Bosnali on this forum running 9.60s in the 140s, cutting 1.2 60's on a BONE STOCK BW T-56 (except for clutch).
Originally Posted by enisguy
I would suggest replacing it with a used Borg-Warner T-56 from an LT1 car. They're far more stout than the LT1 4L60E and quite a few enthusiasts believe that they are far stronger than the Tremec T-56 found in the LS1 cars. There is a guy named Taner Bosnali on this forum running 9.60s in the 140s, cutting 1.2 60's on a BONE STOCK BW T-56 (except for clutch).
Nothing's wrong with your tranny, or your car. Your problem is a 3500 stall in an OBD-1 car. There isn't any surefire/good way around it. The computer reads the stall as slippage, and doesnt shift the trans until after you hit redline (for a second or more in some cases) which is what your experiencing.
Thread Starter
Launching!
Joined: Jan 2004
Posts: 213
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(DIETCOKE) so your saying that it's my pcm not reading right?
is there a cure for that? because my transmission shift's perfectly while driving in the city and i would hate to spend extra money on trans and and then resulting not being the problem.
is there a cure for that? because my transmission shift's perfectly while driving in the city and i would hate to spend extra money on trans and and then resulting not being the problem.
Originally Posted by ram air camaro
(DIETCOKE) so your saying that it's my pcm not reading right?
is there a cure for that? because my transmission shift's perfectly while driving in the city and i would hate to spend extra money on trans and and then resulting not being the problem.
is there a cure for that? because my transmission shift's perfectly while driving in the city and i would hate to spend extra money on trans and and then resulting not being the problem.