| The 8th Gen Riviera Resource |
| | FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load | |
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IBx1 Expert
Name : ILAN Age : 33 Location : College Station, TX Joined : 2007-12-30 Post Count : 4304 Merit : 69
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 10:35 am | |
| He disappeared.....
You gotta give us some info though, like TS89 said.
Riviera's go from '65 to '99 around here, and have everything from a turbo six, to a super six, to a 455. And there's also 87, 89, and 93 fuel that you could be feeding this thing. If you tell us about the car and a more specific description of the problem, we can help you. | |
| | | ericde Enthusiast
Joined : 2008-01-25 Post Count : 108 Merit : 1
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 1:46 pm | |
| its 1996 seris 2 supercharged i dont know much about this car | |
| | | IBx1 Expert
Name : ILAN Age : 33 Location : College Station, TX Joined : 2007-12-30 Post Count : 4304 Merit : 69
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 2:02 pm | |
| If it has high miles it sounds like it's due for a cleanup and tuneup. If you're overdue for a tuneup, that's why you have this problem. If there's no power coming from the enigne, and there doesn't seem to be a transmission problem, then there's probably a lot of gunk inside too. Have your fuel filter checked and cleaned if it needs to be done, and start using something like Z-Max if it's a high mileage engine. When you go for a tuneup, just ask them to check everything that may be holding you back. How many miles are on it? | |
| | | ericde Enthusiast
Joined : 2008-01-25 Post Count : 108 Merit : 1
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 2:07 pm | |
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| | | IBx1 Expert
Name : ILAN Age : 33 Location : College Station, TX Joined : 2007-12-30 Post Count : 4304 Merit : 69
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 2:18 pm | |
| Sounds right, do you know if it had a tune up since the 80,000 mile mark? | |
| | | ericde Enthusiast
Joined : 2008-01-25 Post Count : 108 Merit : 1
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 2:33 pm | |
| thats about when i bought havent done much to it since besides oil change | |
| | | ericde Enthusiast
Joined : 2008-01-25 Post Count : 108 Merit : 1
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 2:34 pm | |
| could the slow response be because the fuel im using | |
| | | IBx1 Expert
Name : ILAN Age : 33 Location : College Station, TX Joined : 2007-12-30 Post Count : 4304 Merit : 69
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 2:52 pm | |
| Fuel shouldn't have much to do with it, unless it's used to premium and you give it regular. The slow response means the engine's interior components are gunked up and there's a lot of resistance. Buy some Z-Max, take a drive, and that should clean it up. | |
| | | ericde Enthusiast
Joined : 2008-01-25 Post Count : 108 Merit : 1
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 3:03 pm | |
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| | | AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18451 Merit : 252
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 5:33 pm | |
| replace the ignition wires, then spark plugs if necessary. Good luck. _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k 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 • 180º 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^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
| | | deekster_caddy Master
Name : Derek Age : 52 Location : Reading, MA Joined : 2007-01-31 Post Count : 7717 Merit : 109
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Fri Jan 25, 2008 7:31 pm | |
| watch your octane (super super super!), basic tune-up, then we can go from there.
Any funny noises coming from the serpentine belts? | |
| | | dreww Junkie
Location : Dallas Joined : 2007-04-10 Post Count : 851 Merit : 9
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Jan 28, 2008 12:42 am | |
| most likely a spark and/or fuel problem. definitely start with plugs (cheap) and perhaps wires ( I still have my originals). a fuel filter is cheap and probably due too. some sea-foam might help too. | |
| | | cragmor Amateur
Name : Jerry Location : Iowa Joined : 2007-02-12 Post Count : 49 Merit : 0
| Subject: FAQ: Hesitation, Stutter, Shudder, Stumbling Under Acceleration/Load Mon Feb 25, 2008 10:48 am | |
| My car started hesitating last week. Missing under load etc. It was idling well enough, starting fine. Under very light accel, it did ok. Once I got on the accel, it would hesitate. I remember an old Regal (81) that did this, and it was timing. Anyhow, put the scanner on while driving. At idle, advance is around 23 degrees. While driving down the interstate, around 3k RPM, advance was at upper 30s. When I got on it, accelerating, advance dropped to between 9-15 degrees. That causes alarm. Would think that it would either stay, or go up when accelerating. Anyhow, knock count goes thru the roof as well when under accel. I am thinking my crank and/or cam sensor might be the culprit. As far as other things go, plugs and wires are < 20k old. Considered gas before, but it started when I needed a fillup. Still doing it after. Put in heat to make sure no water etc. Car also stalls in cold weather. Just stops while driving. Leave it sit for a few minutes, and it starts right up. When it does stall, it cranks fine, just no hint of firing. Has yet to stall on me when above 50 degrees. (not completely sure, could be 40, or maybe 55) | |
| | | deekster_caddy Master
Name : Derek Age : 52 Location : Reading, MA Joined : 2007-01-31 Post Count : 7717 Merit : 109
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 11:16 am | |
| What kind of scanner do you have? Do you have an SES light? Any trouble codes?
The accel problem sounds like a bad spark plug to me. Timing sounds normal, it's generally around 15 but with KR the computer is pulling timing. I suspect your KR could also be due to your bad plug (if that's the issue).
I'd like to see a scan of a number of parameters including MAF Hz as we start our troubleshooting...
What year is your car? It's very helpful to us for you to put info about your car into your signature.
-Derek | |
| | | cragmor Amateur
Name : Jerry Location : Iowa Joined : 2007-02-12 Post Count : 49 Merit : 0
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 11:30 am | |
| Forgot about the SES. No light, no codes. KR remains at 0 no matter what I do. The car is a 95 Rivi, SC. about 145k miles. Also, no weak cylinders are reported. The scanner is an Auto Xray. I forget the model. | |
| | | Mr.Riviera Expert
Name : Matthew Age : 38 Location : Florida Joined : 2007-01-17 Post Count : 4394 Merit : 101
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 11:39 am | |
| how old is the fuel filter? have you cleaned the maf recently? plugs look ok? that is surprising that no code pops up. _________________ 1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP AMG C400 White on black. Stage 2 w/E30 - 11.9@117 -daily | |
| | | AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18451 Merit : 252
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 11:41 am | |
| What kind of ignition wires did you buy? How long since you changed the fuel filter?
How can knock count be through the roof when KR remains 0 no matter what you do? _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k 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 • 180º 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^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
| | | cragmor Amateur
Name : Jerry Location : Iowa Joined : 2007-02-12 Post Count : 49 Merit : 0
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 11:47 am | |
| - AA wrote:
- What kind of ignition wires did you buy? How long since you changed the fuel filter?
How can knock count be through the roof when KR remains 0 no matter what you do? Well, I guess it happens like this. Scanner shows knock count increasing. It reaches 255 then starts over again. Switch to KR, and no matter how hard I get on it, it never changes from 0. I have to check the plugs yet. The wires are stock, oem wires. The thing that moves me from plugs and wires is that the car had been stalling while driving, like it is now, since last winter. Stalls out, let it sit for a few minutes, starts right up again. I also have had codes for the cam/crank sensor. It does not specify which one, just that one or both have a problem. I do not have the specific code on me. | |
| | | Mr.Riviera Expert
Name : Matthew Age : 38 Location : Florida Joined : 2007-01-17 Post Count : 4394 Merit : 101
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 11:54 am | |
| is this hesitation only once during a drive cycle or does it do it every time you get on the gas? _________________ 1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP AMG C400 White on black. Stage 2 w/E30 - 11.9@117 -daily | |
| | | cragmor Amateur
Name : Jerry Location : Iowa Joined : 2007-02-12 Post Count : 49 Merit : 0
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 12:11 pm | |
| - Mr.Riviera wrote:
- is this hesitation only once during a drive cycle or does it do it every time you get on the gas?
Every time I get on the gas. It appears to get better as time goes by/car warms up, but it is still there. | |
| | | AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18451 Merit : 252
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 12:32 pm | |
| Is cat converter okay? One way to test is to put car in neutral and rev the engine to the 3-4k range (when warm). According to GM:
"If the engine freely accelerates to higher RPM in Neutral, you can assume that the engine and the exhaust system are normal."
If there is any lag in getting into the upper RPMs, you might have a clogged cat. _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k 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 • 180º 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^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
| | | turtleman Expert
Name : Codith Age : 37 Location : Villa Park, IL Joined : 2007-02-08 Post Count : 3671 Merit : 140
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 12:39 pm | |
| - AA wrote:
- Is cat converter okay? One way to test is to put car in neutral and rev the engine to the 3-4k range (when warm). According to GM:
"If the engine freely accelerates to higher RPM in Neutral, you can assume that the engine and the exhaust system are normal."
If there is any lag in getting into the upper RPMs, you might have a clogged cat. I don't get how that would work. That would only be like 5-10% throttle tops. | |
| | | AA Administrator
Name : Aaron Age : 47 Location : C-bus, Ohio Joined : 2007-01-13 Post Count : 18451 Merit : 252
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 12:47 pm | |
| I think it's the speed (time) at which the revs are achieved. If it's delayed compared to normal (whatever that is), the cat is clogged. I copied that out of my GM shop manual. _________________ '05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes'98 SC Riviera • 281k 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 • 180º 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^^^ SOLD ^^^ '70 Ninety-Eight Holiday Coupe 455cid • 116k miles^^^ SOLD ^^^ | |
| | | ibmoses Aficionado
Name : Bert Location : North Alabama Joined : 2008-02-03 Post Count : 1701 Merit : 32
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Mon Feb 25, 2008 6:53 pm | |
| - Mr.Riviera wrote:
- how old is the fuel filter? have you cleaned the maf recently? plugs look ok?
that is surprising that no code pops up. You have replaced the fuel filter? Bert | |
| | | cragmor Amateur
Name : Jerry Location : Iowa Joined : 2007-02-12 Post Count : 49 Merit : 0
| Subject: Re: FAQ: Hesitation, Stutter(Studder), Shudder, Stumbling, on Acceleration/Load Wed Feb 27, 2008 10:02 am | |
| Did not realize that I was posting this in Series II, as mine is a 95. Anyhow, it sounds like a coil is going to pot, and the mechanic (Riv enthusiast) also said that the SC is going bad. He thinks that it is starting to impede air into the engine. I explained that before this happened, it was running great. Ran quick and hard. Not doubting that the unit could be going bad, but I doubt that it is my problem right now. Anyhow, good place to get a cheap SC for my 95? Cheap because I am not looking to drop much more cash into this car. It is about to meet the crusher with all it as cost me. | |
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