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 1998 Riv jerking when crusing and also accelerating

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18tyweslow
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18tyweslow

Name : Tyler Weslow
Location : Green Bay, WI
Joined : 2018-02-26
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PostSubject: 1998 Riv jerking when crusing and also accelerating   Thu Dec 27, 2018 8:10 pm

Hi everyone,

I have a 1998 Riv with around 175k on it. I noticed recently the car likes to jerk. I'll have cruise control on going 60MPH, the car will make a big jerk and the cruise will turn off. It happens with and without cruise control on. It also happens when I'm accelerating, just less so. Happens at all speeds as well, not just high speeds.

Anyone have any idea? Please don't tell me my tranny is going. frown
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Abaddon
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Abaddon

Name : Scott
Location : Macomb, Michigan
Joined : 2010-02-24
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PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Fri Dec 28, 2018 8:43 am

18tyweslow wrote:
Hi everyone,

I have a 1998 Riv with around 175k on it. I noticed recently the car likes to jerk. I'll have cruise control on going 60MPH, the car will make a big jerk and the cruise will turn off. It happens with and without cruise control on. It also happens when I'm accelerating, just less so. Happens at all speeds as well, not just high speeds.

Have you noticed the RPMs going up, and then a big bang? Does it jerk in reverse? From a take off?
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18tyweslow
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18tyweslow

Name : Tyler Weslow
Location : Green Bay, WI
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PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Fri Dec 28, 2018 11:16 am

I have not noticed it jerking in reverse or take off. Itís normally just cruising. It jerks a tiny tiny bit when Iím giving it a lot of gas when already moving, for example on a 35 road turning on to an onramp. I have not noticed anything strange with the RPMs.
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LARRY70GS
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LARRY70GS

Name : Larry
Age : 62
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PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Fri Dec 28, 2018 1:16 pm

Does it stutter when you get on it, like misfire?

_________________
98 Riviera SC3800 †All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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Abaddon
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Abaddon

Name : Scott
Location : Macomb, Michigan
Joined : 2010-02-24
Post Count : 4286
Merit : 179

PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Fri Dec 28, 2018 2:39 pm

18tyweslow wrote:
I have not noticed it jerking in reverse or take off. Itís normally just cruising. It jerks a tiny tiny bit when Iím giving it a lot of gas when already moving, for example on a 35 road turning on to an onramp. I have not noticed anything strange with the RPMs.

The reason I asked is to rule out the transmission wink
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pbrktrt
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Name : patrick gervais
Location : muskegon.mi
Joined : 2011-07-18
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PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Sun Dec 30, 2018 11:34 am

Ignition control module starting to fail perhaps?
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albertj
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albertj

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PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Mon Dec 31, 2018 11:00 am

18tyweslow wrote:
Hi everyone,

I have a 1998 Riv with around 175k on it. I noticed recently the car likes to jerk. I'll have cruise control on going 60MPH, the car will make a big jerk and the cruise will turn off. It happens with and without cruise control on. It also happens when I'm accelerating, just less so. Happens at all speeds as well, not just high speeds.

Anyone have any idea? Please don't tell me my tranny is going. frown

Is the Check Engine or Service Engine Soon light on, and if so did you read the codes and what are they.

Does "jerk" mean sudden acceleration or sudden loss of power?

It is quite important to know whether you have or haven't a code set. If you have a code set, it is important to know what it is. A set code may indicate a failure in some other component.

What I would actually do: connect a Tech II or other comprehensive scanner (on my Riv I generally use CarCode and a laptop) and take a driving log of the (entire) OBD II data stream until experiencing the problem, then limp back to the shop and read the log (and review the car's maintenance history) to see what the data pattern points to.

Albertj
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18tyweslow
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18tyweslow

Name : Tyler Weslow
Location : Green Bay, WI
Joined : 2018-02-26
Post Count : 7
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PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Wed Jan 02, 2019 6:21 pm

albertj wrote:
18tyweslow wrote:
Hi everyone,

I have a 1998 Riv with around 175k on it. I noticed recently the car likes to jerk. I'll have cruise control on going 60MPH, the car will make a big jerk and the cruise will turn off. It happens with and without cruise control on. It also happens when I'm accelerating, just less so. Happens at all speeds as well, not just high speeds.

Anyone have any idea? Please don't tell me my tranny is going. frown

Is the Check Engine or Service Engine Soon light on, and if so did you read the codes and what are they. †

Does "jerk" mean sudden acceleration or sudden loss of power?

It is quite important to know whether you have or haven't a code set. †If you have a code set, it is important to know what it is. †A set code may indicate a failure in some other component.

What I would actually do: †connect a Tech II or other comprehensive scanner (on my Riv I generally use CarCode and a laptop) and take a driving log of the (entire) OBD II data stream until experiencing the problem, then limp back to the shop and read the log (and review the car's maintenance history) to see what the data pattern points to.

Albertj

No, it has no check engine light on. I've scanned it and no codes are being thrown.
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albertj
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albertj

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Location : Finger Lakes of New York State
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PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Sat Jan 05, 2019 4:51 pm

Off the top of my head I suspect the crank sensor or the ignition switch. What do the rest of you think?

18tyweslow wrote:
albertj wrote:
18tyweslow wrote:
Hi everyone,

I have a 1998 Riv with around 175k on it. I noticed recently the car likes to jerk. I'll have cruise control on going 60MPH, the car will make a big jerk and the cruise will turn off. It happens with and without cruise control on. It also happens when I'm accelerating, just less so. Happens at all speeds as well, not just high speeds.

Anyone have any idea? Please don't tell me my tranny is going. frown

Is the Check Engine or Service Engine Soon light on, and if so did you read the codes and what are they. †

Does "jerk" mean sudden acceleration or sudden loss of power?

It is quite important to know whether you have or haven't a code set. †If you have a code set, it is important to know what it is. †A set code may indicate a failure in some other component.

What I would actually do: †connect a Tech II or other comprehensive scanner (on my Riv I generally use CarCode and a laptop) and take a driving log of the (entire) OBD II data stream until experiencing the problem, then limp back to the shop and read the log (and review the car's maintenance history) to see what the data pattern points to.

Albertj

No, it has no check engine light on. I've scanned it and no codes are being thrown.
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LARRY70GS
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LARRY70GS

Name : Larry
Age : 62
Location : Oakland Gardens, NY
Joined : 2007-01-23
Post Count : 1628
Merit : 111

PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Sun Jan 06, 2019 11:37 am

It sounds like misfire to me. Very easy to rule misfire out by using a decent (not expensive) scan tool. OBD2 has a misfire monitor for each cylinder. It keeps a running count for each cylinder. It will not light the CEL unless it is severe or often enough. If you see a single cylinder misfiring, suspect that wire or spark plug. If a pair of companion cylinders are misfiring (1-4, 2-5, 3-6), suspect that coil. The OP needs to do some scan tool diagnostics first. It could also be Torque Converter Clutch problems as well. Very difficult to diagnose this over the internet. Other than that, we can just guess, and the OP will replace parts he may not have to, and waste money.

_________________
98 Riviera SC3800 †All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
https://www.youtube.com/watch?v=sfT2tEO4XcU
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albertj
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albertj

Name :
Location : Finger Lakes of New York State
Joined : 2007-05-31
Post Count : 7160
Merit : 137

PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Mon Jan 07, 2019 11:19 am

LARRY70GS wrote:
It sounds like misfire to me. †Very easy to rule misfire out by using a decent (not expensive) scan tool. †OBD2 has a misfire monitor for each cylinder. †It keeps a running count for each cylinder. †It will not light the CEL unless it is severe or often enough. †If you see a single cylinder misfiring, suspect that wire or spark plug. †If a pair of companion cylinders are misfiring (1-4, 2-5, 3-6), suspect that coil. †The OP needs to do some scan tool diagnostics first. †It could also be Torque Converter Clutch problems as well. †Very difficult to diagnose this over the internet. Other than that, we can just guess, and the OP will replace parts he may not have to, and waste money.

+1 this.
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18tyweslow
Newbie
18tyweslow

Name : Tyler Weslow
Location : Green Bay, WI
Joined : 2018-02-26
Post Count : 7
Merit : 0

PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Tue Jan 22, 2019 3:45 pm

albertj wrote:
LARRY70GS wrote:
It sounds like misfire to me. †Very easy to rule misfire out by using a decent (not expensive) scan tool. †OBD2 has a misfire monitor for each cylinder. †It keeps a running count for each cylinder. †It will not light the CEL unless it is severe or often enough. †If you see a single cylinder misfiring, suspect that wire or spark plug. †If a pair of companion cylinders are misfiring (1-4, 2-5, 3-6), suspect that coil. †The OP needs to do some scan tool diagnostics first. †It could also be Torque Converter Clutch problems as well. †Very difficult to diagnose this over the internet. Other than that, we can just guess, and the OP will replace parts he may not have to, and waste money.

+1 this.

LARRY70GS wrote:
It sounds like misfire to me. †Very easy to rule misfire out by using a decent (not expensive) scan tool. †OBD2 has a misfire monitor for each cylinder. †It keeps a running count for each cylinder. †It will not light the CEL unless it is severe or often enough. †If you see a single cylinder misfiring, suspect that wire or spark plug. †If a pair of companion cylinders are misfiring (1-4, 2-5, 3-6), suspect that coil. †The OP needs to do some scan tool diagnostics first. †It could also be Torque Converter Clutch problems as well. †Very difficult to diagnose this over the internet. Other than that, we can just guess, and the OP will replace parts he may not have to, and waste money.

LARRY70GS wrote:
Does it stutter when you get on it, like misfire?

Hiya guys, just giving a quick update.. I did some testing on the coilpacks and found that one of them was acting a little strange with the test I did with a little device that tests if a wire is live or not. I went out on a whim and tried replacing it, and viola! No more misfiring and jerking!
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albertj
Guru
albertj

Name :
Location : Finger Lakes of New York State
Joined : 2007-05-31
Post Count : 7160
Merit : 137

PostSubject: Re: 1998 Riv jerking when crusing and also accelerating   Wed Jan 23, 2019 8:58 pm

18tyweslow wrote:
albertj wrote:
LARRY70GS wrote:
It sounds like misfire to me. †Very easy to rule misfire out by using a decent (not expensive) scan tool. †OBD2 has a misfire monitor for each cylinder. †It keeps a running count for each cylinder. †It will not light the CEL unless it is severe or often enough. †If you see a single cylinder misfiring, suspect that wire or spark plug. †If a pair of companion cylinders are misfiring (1-4, 2-5, 3-6), suspect that coil. †The OP needs to do some scan tool diagnostics first. †It could also be Torque Converter Clutch problems as well. †Very difficult to diagnose this over the internet. Other than that, we can just guess, and the OP will replace parts he may not have to, and waste money.

+1 this.

LARRY70GS wrote:
It sounds like misfire to me. †Very easy to rule misfire out by using a decent (not expensive) scan tool. †OBD2 has a misfire monitor for each cylinder. †It keeps a running count for each cylinder. †It will not light the CEL unless it is severe or often enough. †If you see a single cylinder misfiring, suspect that wire or spark plug. †If a pair of companion cylinders are misfiring (1-4, 2-5, 3-6), suspect that coil. †The OP needs to do some scan tool diagnostics first. †It could also be Torque Converter Clutch problems as well. †Very difficult to diagnose this over the internet. Other than that, we can just guess, and the OP will replace parts he may not have to, and waste money.

LARRY70GS wrote:
Does it stutter when you get on it, like misfire?

Hiya guys, just giving a quick update.. I did some testing on the coilpacks and found that one of them was acting a little strange with the test I did with a little device that tests if a wire is live or not. I went out on a whim and tried replacing it, and viola! No more misfiring and jerking!

Looks like Larry almost nailed it, way to go. +1 to the OP for checking the coils.
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