1995 Buick Riviera

CMAX13007

MEMBER
1995 BUICK RIVIERA
6 CYL
FWD
AUTOMATIC
183,000 MILES

To whom it may concern:

Not surre if my issue is engine control/electrical or transmission issue. Bellow is a discription of my problem, any help would be greatly appreciated:

At 55mph the engine is turning at approx 1500 rpm and the vehicle starts to bog down in power and jolt (a timing or transmission issue?). Acclereating slowly does nothing, but acclerating faster rids this condition. Its only happens when the vehicle is pushing 1500rpm during driving. Mostly at 55rpm, but recently it is getting worse 55-75 mph! The vehicle was driving at 55mph the majority of its life since it was my grand parents. I am not sure where to start and feel it is more a timing issue than transmission but not sure. Any ideas?

Thanks,

Chris

5 Replies

MIKE H R

MECHANIC
3,094 POSTS

What would do is get a tune up, if not done allready. You can also put some fuel systwem cleaner in the fuel to help in case the injectors to help clean the injectors. Even with it being driven at 55 the engine should be ok. Except for normal maintance. This may not cure the problem but is a place to start.

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Saturday, January 17th, 2009 AT 10:44 AM

CMAX13007

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6 POSTS

Thanks for the recommendations. My next step will be to add fuel sablizers and cleaners, maybe a new fuel filter. This might cure the problem.

I do remember searching the interenet for timing issues and found that the chips on the circuit board of the ECM/ECU (engine control module/unit) get loose and cases timing issues. I wish I could find that article, but cant for the life of me!

Anyways, this is a good place to start with not spending much money.

Please keep the recommendations coming, its greatly appreciated.

Chris

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Sunday, January 18th, 2009 AT 11:07 AM

CMAX13007

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6 POSTS

Ok. Fuel system cleaners kinda worked for a while but jolting or surging is back again. Injectors should be clean now. I also heard by running 93 super plus from a mobile gas station. It containts injector scrubers and fuel cleaners. Not sure whats going on?

Maybe Rusted Gas Tank or Clogged Fuel filter. I might do a quick tune up myself. Plugs, maybe injectors depending on price, wires, and coil pack.
Anyone else have any ideas?

CMAX

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Friday, February 13th, 2009 AT 11:06 AM

MIKE H R

MECHANIC
3,094 POSTS

If fuel system cleaner worked for a little while then I would go ahead and change the fuel filter.

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Sunday, February 15th, 2009 AT 10:36 AM

CMAX13007

MEMBER
6 POSTS

After a joy ride with a friend that works for ford we finally diagnosed the problem. I had thought it was either the tranny or timing=misfire. He agreed that it was probably a misfire. Which is usually caused by old spark plugs with extreme gap. After changing fuel filter, plugs, and plug wireset ($55) the problem was solved.

Warning - the back row spark plugs are a hell to change.

No more misfires and engine runs much better.

Lastly,

Thanks for all the help. Turns out it just need a good tune up.

CMAX