Question about 1995 Buick Riviera

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What causes the rpm needle to jump back and fourth while car is idling in my 1995 buick riviera

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Could be a missfire or faulty connection

Posted on Jul 17, 2009

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Posted on Jan 02, 2017

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1 Answer

Loud Knocking noise coming from engine


Most likely the engine harmonic balancer on the front of the crankshaft is coming apart. This is a fairly common issue.

Nov 06, 2013 | 1995 Buick Riviera

1 Answer

Car will not tac. over 3000 rpm


Hi and welcome to FixYa!

If that's the case then you surely have a faulty TPS (throttle position sensor). If the TPS is faulty you'll have an erratic idle, idle won't go up or the car won't move at all. I strongly suggest that you have it replaced to resolve the issue.

Hope you find this information helpful enough and thank you for using FixYa! Have a good one!

Jan 29, 2011 | 1995 Buick Riviera

1 Answer

1995 buick riviera 3.8 supercharged engine. Cold start issue. have to restart multiple times and it barely runs...spits back again and again until the engine warms up. once warm it runs correctly and...


Hello lysiphlebus2,

((My thoughts: cold START valve IAC at very bottom))

Plenty of places will do FREE diagnostic code reads.

I would rather suggest it be a muffler shop than
AUTOZONE... but either is better than guessing.

AUTOZONE will likely make you buy OXYGEN
sensors... (but that makes about as much sense as
buying a new THERMOMETER every-time you
have a FEVER.

What you are describing sounds (from an old
mechanic's perspective) like a collapsing
catalytic convertor or rotted muffler baffle
(a slightly better blockage will halt operation
completely)...

((again speculation... get your codes read))...

Do not buy OXYGEN SENSORS....

Know your prices before waltzing into any
exhaust shop.

AMAZON
1 24 of 108 results for Automotive 1995 riviera catalytic 1995 riviera...

rockauto
1995 BUICK RIVIERA 3 8L V6 Supercharged Catalytic Converter RockAuto

IAC (cold start valve)
1995 BUICK RIVIERA 3 8L V6 Supercharged Idle Air Control IAC Valve RockAuto

Hope this helps

Carnac the Magnificent

Oct 19, 2017 | 1995 Buick Riviera

1 Answer

1995 buick riviera supercharged after 4000 rpms i lose power seems like its not getting enough fuel. if not this what else could it be


if you are racing the engine up to 4000 rpm in park, you may be hitting the rev limiter - if while driving you have be seeing the start of an ignition problem

Oct 18, 2009 | 1995 Buick Riviera

1 Answer

1995 buick riviera super charged


Check for vacuum leaks and EGR operation - If no vac leaks, I'd bet it was the IAC-AAC Valve -(Idle air control/Aux.Air control) - It can sometimes be cleaned and lubricated, but it depends - I usually replace them when I have determined that to be the problem...Hope that helps or gives you a start point...

Aug 30, 2009 | 1995 Buick Riviera

1 Answer

1995 riviera supercharged with 91000 miles has a


check compression possible burnt valve check fuel pressure check ignition componants

Jul 10, 2009 | 1995 Buick Riviera

2 Answers

1995 Buick Riviera


my 1995 buick riviera loses all power when i accelerate.it does not stall, but when i let go back to its regular idle, it takes a minute or so to get back normal. i have to leave it on its regular idle to get anywere, like back home

Oct 18, 2008 | Buick Riviera Cars & Trucks

2 Answers

1995 Buick Riviera supercharged The tachometer is "jumping" and the car is now stalling intermittently. Starter, Battery and Alternator have beren recently replaced. What would cause the tach...


I had the same problem with stalling & found the throttle sensor helped. It was only a $15 part @ an aftermarket parts supplier. You'll need small fingers to get to the few screws holding it in place. Also make sure it's positioned correctly before installing & tightening the screws.
Good Luck!

Aug 21, 2008 | 1995 Buick Riviera

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