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 96 Riv S/C Stuttering/Misfiring

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trumbo71
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 1:38 pm

Running the motor without the SC belt wont hurt it will it? I thought I seen the coolant pump on the same belt on a diagram..
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 1:53 pm

On second thought, maybe it's best to leave the belt where it is. I've done it before, but if you don't understand how the belts are routed, it is possible to do damage.

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jonly
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 1:57 pm

I ran my 96 without a sc belt for about a week while I was trying to find time to replace it. sc only on that belt.
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trumbo71
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 1:57 pm

Im probably gonna go ahead and do it just go around the block with it, I tried finding a diagram on the forums but with no luck ill probably draw up one before I take it off..
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 2:03 pm

bad thing is you have to take the mount out to get the belt off and out of the engine compartment.
or cut the belt. worst part of these cars imo.

well, that and trying to smoke when it's raining.
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 2:05 pm

Don't cut the belt, just slip it off the crank pulley and tie it clear with zip ties (pull it tight against the motor mount bracket).

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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trumbo71
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 2:17 pm

kk sounds good.

good thing i got a fresh bag of zip ties smile
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trumbo71
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 3:22 pm

K I removed the Supercharger belt took it for a spin around the block, same symtpoms...

Had someone turn infront of me slowed down, when to accelerate rpms dropped to 1k and stuttered pretty bad let off the gas reapplied got back up to 2k and almost started to stutter but let off the gas just in time to prevent it.
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 3:27 pm

how's the weather? different than it has been at all?
what about gas? different gas station? has this symptom persisted through 2 tanks?
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trumbo71
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 3:28 pm

About 45 degrees clear and sunny

Yeah been about 3 tanks of gas, also my trunk lets water in is it possible for it to reach the gas tank from there?

It did run better then with the supercharger but still was able to produce the misfire/stutter

The previous owner did the spark plug replacement Im wondering if he Gap'd em right whats the proper gap? and is their an easy way to reach the back spark plugs
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 3:41 pm

Did the previous owner do the ignition wires, too?

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
trumbo71
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 3:42 pm

Yup, But I actually bought a new set swapped em same thing, thankfully the guys at autozone let me return them got my $25 back razz

Note : At start up 90% of the time I have to give it gas or itll just chug then die, also usually a pretty strong gas smell but could be from misfires?
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 3:49 pm

trumbo71 wrote:
Yup, But I actually bought a new set swapped em same thing, thankfully the guys at autozone let me return them got my $25 back razz

Note : At start up 90% of the time I have to give it gas or itll just chug then die, also usually a pretty strong gas smell but could be from misfires?

Is the starting issue more apparent once the car is warm - i.e on short trips?
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trumbo71
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 3:54 pm

Well the car had sat for about a month when the guy sold it to me and when he started it it smoked quite a bit.
Now some mornings Ill hop in itll start as soon as I turn the key, but say 4 hours later when I go on lunch from work ill have to hit the gas again.

But most mornings I do have to hit the gas..
But no it is less apparent when its warm..

The smoke when he started it after a month make me wonder if the LIMs leaking..

And I think I just spotted that my oil pan is bent in, I think the previous owner did it when he changed the serpentine, could that cause a misfire, and Im guessing I should probably replace that..


Last edited by trumbo71 on Mon Mar 28, 2011 4:20 pm; edited 1 time in total
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 4:14 pm

From what I've seen, most oil pans are dented on older cars. No need to change it unless its cracked or leaking. That wouldn't cause a misfire.
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Mon Mar 28, 2011 4:44 pm

trumbo71 wrote:
Well the car had sat for about a month when the guy sold it to me and when he started it it smoked quite a bit.
Now some mornings Ill hop in itll start as soon as I turn the key, but say 4 hours later when I go on lunch from work ill have to hit the gas again.

But most mornings I do have to hit the gas..
But no it is less apparent when its warm..

The smoke when he started it after a month make me wonder if the LIMs leaking..

And I think I just spotted that my oil pan is bent in, I think the previous owner did it when he changed the serpentine, could that cause a misfire, and Im guessing I should probably replace that..

jacking on the oil pan to change the serp belt will usually leave the oil pan gasket leaking, even if you don't dent the pan.

Just for information, best way around that is to get a short piece of 4x4 (some of you know this as mailbox post) and use it as a block under one or another engine boss in the vicinity of the front (near the crank pulley) of the engine. I forget exactly where though.

On the 97 and later actually you only need to hold the engine in place and remove a bolt and ferrule that are in the lower right corner of the motor mount (wipe the dirt off it will be obvious). You can slip the belt out/in that opening without actually removing any mounts but in order to get the holes to line up right you might need to jack up the engine a little to relieve strain.

There are other posts on this, and also Len Rapkins some time ago posted good info on repacing the morot mounts without spending a $*#@&$( fortune. Basically there are inserts to get from rockauto.com, and you can also get the front mount for a park avenue and swap inserts with the Riv's mount.
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Tue Mar 29, 2011 12:17 am

So guys Im almost 100% certain its the transmission...

Was driving home from a friends house and decided well, lets try driving it manually switching from gear to gear. Put her in first got on her real good no stuttering, misfiring got to 4k rpms let off the gas put her in second got up to about 4k again no misfiring as of yet or stuttering, put her in 3rd gave it real good throttle and it started to misfire and stutter..

Well hell when I got home I just decided to go around the block, went down the hill from my house getting on her real good no stuttering.. but the first turn from my house is uphill so i tried first was able to get to 4k no misfiring stuttering, switched to second got about 3k maybe lesss and it stuttered not awfully but I could feel it pretty well..

Do transmission problems cause misfiring?
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L67
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Tue Mar 29, 2011 7:03 am

Not necessarily, higher gears result in a greater load on the engine and will cause more of a misfiring problem, which will be amplified if going uphill.
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Tue Mar 29, 2011 1:18 pm

I'd check the plugs before assuming the transmission. As far as I know, the transmission won't cause a missfire.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
Abaddon
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Tue Mar 29, 2011 3:46 pm

A transmission has never and never will cause a misfire.......
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trumbo71
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Tue Mar 29, 2011 5:16 pm

Hrm doesnt explain the fact that during takeoff with it just in drive it will stutter if i go above 2000rpms but leaving it in 2nd I have no stuttering. Possible somesort of shift regulator in the trans is going bad? Idk what it would be called in the riv..

Possibly the stutter and misfire are unrelated?
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Tue Mar 29, 2011 6:19 pm

There is a PWM Solenoid inside the trans that goes bad occasionally. It will cause a launch shudder, delayed shifts from 2-3, and a "hunting" for overdrive at around 55mph. This would be more noticeable going uphill. I've had to replace mine for the same problem......I'd hook up a scan tool if you have access to one and go drive while monitoring the misfire counter. This will lead you in the right direction.....
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Tue Mar 29, 2011 10:15 pm

That sounds similar to my problems at around 45 itll try to jump into overdrive and go to 1.5k rpms I let off the gas and hit it again and it will be at about 2k if i try to accelerate itll go back to 1.5k it feels like its in too high of a gear when it does it..
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Wed Mar 30, 2011 8:43 am

Maybe the converter is locking up? Or that solenoid is just plugged with goo?
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PostSubject: Re: 96 Riv S/C Stuttering/Misfiring   Wed Mar 30, 2011 10:14 am

Quote :
I know the car is misfiring its throwing the codes P0300...
How would the converter or solenoid throw a misfire code?

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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