Riviera Performance
Would you like to react to this message? Create an account in a few clicks or log in to continue.

The 8th Gen Riviera Resource
 
HomeDashboardSearchRiviera Questions & AnswersWrite-Ups IndexRegisterRelated LinksLog in

 

 car runs rough when it gets up to operating temp

Go down 
Go to page : Previous  1, 2, 3, 4
AuthorMessage
robotennis61
Guru
robotennis61

Name : robotennis
Age : 58
Location : las vegas
Joined : 2007-12-17
Post Count : 5561
Merit : 142

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyThu Apr 04, 2013 6:53 pm

LARRY70GS wrote:
Actually, a vacuum gauge is an excellent diagnostic tool. IMHO, it should be in every mechanics tool box. I use it all the time, but I realize that late model engines with ECM and fuel injection have less use for a vacuum gauge. You can still diagnose valve and ring problems. In any case, a stock 3800 should pull 20" of vacuum fully warm and in Park. Any less than that and you have a leak somewhere, or other problems. My boost gauge is actually partly a vacuum gauge.

Say, Larry,where do you hook the vac gauge up? I hooked it up to the throttle body and to the vac tree atop the S/C and I got zero vac. Am I doing something wrong?
Back to top Go down
bigdave
Fanatic


Name : Dave
Age : 56
Location : Cheektowaga , NY (Buffalo)
Joined : 2010-10-17
Post Count : 399
Merit : 22

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyThu Apr 04, 2013 6:56 pm

Robo, Dave Jr hooked his up to the line that runs to the fuel pressure regulator and it shows vacuum and boost.
Back to top Go down
LARRY70GS
Aficionado
LARRY70GS

Name : Larry
Age : 63
Location : Oakland Gardens, NY
Joined : 2007-01-23
Post Count : 1835
Merit : 122

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyThu Apr 04, 2013 7:30 pm

robotennis61 wrote:
LARRY70GS wrote:
Actually, a vacuum gauge is an excellent diagnostic tool. IMHO, it should be in every mechanics tool box. I use it all the time, but I realize that late model engines with ECM and fuel injection have less use for a vacuum gauge. You can still diagnose valve and ring problems. In any case, a stock 3800 should pull 20" of vacuum fully warm and in Park. Any less than that and you have a leak somewhere, or other problems. My boost gauge is actually partly a vacuum gauge.

Say, Larry,where do you hook the vac gauge up? I hooked it up to the throttle body and to the vac tree atop the S/C and I got zero vac. Am I doing something wrong?

I did as Dave did and hooked up a boost gauge to the hard line that goes over the rear valve cover. Shows vacuum and boost. There has to be a spot to check just manifold vacuum.

_________________
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
Back to top Go down
robotennis61
Guru
robotennis61

Name : robotennis
Age : 58
Location : las vegas
Joined : 2007-12-17
Post Count : 5561
Merit : 142

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyFri Apr 05, 2013 1:11 am

bigdave wrote:
Robo, Dave Jr hooked his up to the line that runs to the fuel pressure regulator and it shows vacuum and boost.
hey Dave thanks for that! I hooked it up and am getting a steady 18lbs of vac,I think thats how you say it? I suppose if it stays in one place its a good thing!
thanks!
Back to top Go down
sniperdude
Fanatic
sniperdude

Name : Mike
Location : Chicago
Joined : 2012-06-04
Post Count : 250
Merit : 18

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyWed Apr 10, 2013 6:27 pm

On that scan data log I took the other day, I checked out the O2 data. The two oxygen sensors (reported as O2-A and O2-B) are both reported in the logs.

O2-A has continuously varying voltage (mV), which is a good thing when watching oxygen sensor data in closed loop (from what I read).

O2-B, however - sits at 448.44mV, occasionally going as high as 452.88mV, but never changing between those two readings.

I'm not sure which sensor is which. But from that data I would say one of them is not reporting changes whatsoever.

Check out the graph I made of the data. (Blue = RPM / Red = O2-A / Green = O2-B)

car runs rough when it gets up to operating temp - Page 4 Scandata
Back to top Go down
sniperdude
Fanatic
sniperdude

Name : Mike
Location : Chicago
Joined : 2012-06-04
Post Count : 250
Merit : 18

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyWed Apr 10, 2013 6:43 pm

Haha, I think there is only one O2 sensor on the 95's, but I'm not sure.

I guess O2-B is just reporting garbage data, since there is no O2-B...
Back to top Go down
Mr.Riviera
Expert
Mr.Riviera

Name : Matthew
Age : 34
Location : Florida
Joined : 2007-01-17
Post Count : 4394
Merit : 101

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyWed Apr 10, 2013 6:57 pm

Rockauto only shows an upstream O2 sensor for the 95's in whcih case yours is performing as it should. Fast response and should be around 850-900 at WOT (which i dont think you did on your run)

Can you read MAF voltage or flow?

_________________
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 -daily
car runs rough when it gets up to operating temp - Page 4 Dsc_0110
Back to top Go down
sniperdude
Fanatic
sniperdude

Name : Mike
Location : Chicago
Joined : 2012-06-04
Post Count : 250
Merit : 18

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyWed Apr 10, 2013 7:19 pm

Yup. Red = RPM, Blue = Fuel Base pulse, Green = Airflow. No MAF, unfortunately. frown

car runs rough when it gets up to operating temp - Page 4 Datascan2

Back to top Go down
sniperdude
Fanatic
sniperdude

Name : Mike
Location : Chicago
Joined : 2012-06-04
Post Count : 250
Merit : 18

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyWed Apr 10, 2013 7:28 pm

This was in park gear, btw. The car is not in motion.
Back to top Go down
sniperdude
Fanatic
sniperdude

Name : Mike
Location : Chicago
Joined : 2012-06-04
Post Count : 250
Merit : 18

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyWed Apr 10, 2013 7:31 pm

If anyone wants to take a look at the scan with Tunerpro RT, my log is here: 2shared.com/file/7OfX2fnD/riviera_scan1.html

You need these def files: http://www.tunerpro.net/download/bindefs/GM/5B_TPV5.xdf and http://www.tunerpro.net/download/datastreams/GM/5B_V5.adx

Back to top Go down
sniperdude
Fanatic
sniperdude

Name : Mike
Location : Chicago
Joined : 2012-06-04
Post Count : 250
Merit : 18

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyThu Apr 11, 2013 5:00 pm

My next plans are to try what Abaddon suggested last week and spray brake cleaner around the vac lines and gasket areas.

If it's the LIM and S/C gasket, I think I could probably do that work on my own. Hell, I've done everything else already, pretty much. razz

I may try and use some thicker oil to boost the compression in Cylinder 4 as well.
Back to top Go down
sniperdude
Fanatic
sniperdude

Name : Mike
Location : Chicago
Joined : 2012-06-04
Post Count : 250
Merit : 18

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyThu Apr 11, 2013 5:02 pm

I'll probably send out the injectors to Mr. Injector to get sonically cleaned as well.
Back to top Go down
sniperdude
Fanatic
sniperdude

Name : Mike
Location : Chicago
Joined : 2012-06-04
Post Count : 250
Merit : 18

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyFri Apr 26, 2013 7:04 pm

Don't wanna leave anyone hanging here.

I ended up getting lucky with some financing and got a new truck.

I really liked the Riv, but there were just too many problems to be financially viable for me.

Not sure what was actually wrong with it, but I suspect the LIM was one of many problems on it.
Back to top Go down
robotennis61
Guru
robotennis61

Name : robotennis
Age : 58
Location : las vegas
Joined : 2007-12-17
Post Count : 5561
Merit : 142

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptyFri Apr 26, 2013 8:16 pm

That sux.I know the felling. But ya gotta move on


Last edited by robotennis61 on Sat Apr 27, 2013 12:31 am; edited 2 times in total
Back to top Go down
joshuadalegrimes
Addict
joshuadalegrimes

Name : josh
Age : 39
Location : harrodsburg, ky
Joined : 2012-09-02
Post Count : 501
Merit : 13

car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 EmptySat Apr 27, 2013 12:24 am

so you gonna sell it?
Back to top Go down
Sponsored content




car runs rough when it gets up to operating temp - Page 4 Empty
PostSubject: Re: car runs rough when it gets up to operating temp   car runs rough when it gets up to operating temp - Page 4 Empty

Back to top Go down
 
car runs rough when it gets up to operating temp
Back to top 
Page 4 of 4Go to page : Previous  1, 2, 3, 4
 Similar topics
-
» Terracan Pro Comp/Rough Country shocks
» New hunting Crossbow
» Composites - Prepregs, Pre-imregnated, Cloths/Tapes, Roving...
» Jas Top Ten
» And I thought the Eglu was expensive...

Permissions in this forum:You cannot reply to topics in this forum
Riviera Performance ::   Supercharged 3800 Tech :: Series I Engine & Transmission-
Jump to: