Rough Idle,Loss Of Power


definitely annoying
Typical Repair Cost:
Average Mileage:
194,000 miles
Total Complaints:
3 complaints

Most Common Solutions:

  1. replace EGR valve (1 reports)
  2. replace mass airflow sensor (1 reports)
  3. swap out bad ignition coil (1 reports)
1995 Pontiac Bonneville engine problems

engine problem

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1995 Pontiac Bonneville Owner Comments

problem #3

Jun 002009

Bonneville SE 3.8L

  • Automatic transmission
  • 240,000 miles


EGR Valve (Engine Gas Recirculation valve) controls gas vapor recirculating into engine. Fitting corroded leaving a hole in tube. It caused poor gas mileage as well as rough idleing (and sometimes stalling at quick stops). (If this doesn't solve it, try replacing MAF sensor (Mass Air Flow Sensor)

- , Fenton, MI, USA

problem #2

May 002010

Bonneville SE 3.8L

  • Automatic transmission
  • 248,000 miles

MAF sensor was causing rough idling. (Occasionally at stops, needle on tachometer would repeatedly sink as if about to stall)

Had it diagnosed with handheld computer tool, (autozone's doesn't work with some older model cars.) said mass air flow sensor error, got taken advantage of- charged for 2 hours labor to diagnose. $120 for sensor $150 for labor.

Save the money and just replace MAF sensor or check EGR valve for leak.

- , Fenton, MI, USA

problem #1

Sep 102008

Bonneville SSE 3.8L

  • Automatic transmission
  • 94,000 miles

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rough idle,loss of power

Intro. My 1995 Pontiac Bonneville SEE hasn't given me problems until now at 95,000. Then again what can you expect for a car that I bought for 1000.00 dollars, right? But so far so go. Until now.

Problem. One day out of the blue my car loses Hp. Doesn't accelerate as fast, has a rough idle to the point where it seams like its going to stall and die out(Revering below 1000rpm at idle), and when I drive, right after the car is shifts into a different gear it Rumbles and Shakes like hell. So I say to my self maybe it was the cheap ass gas I put in it. So I refill with shell v power for 4.09 a gallon. (Not to bad for Romeoville) and even add a bottle of STP total system fuel cleaner and sure enough Nothing Changed.

Solution. So I go online did a little research and found out that there are a million reasons why my car can be doing what is doing. So I started off with the easiest and cheapest ones first. Check the Spark plugs, Spark plug wires, clean the coil posts, air filter, listen for any vacuum leaks, and so on so on so on. Until finally I stumbled across a video on Youtube, called Expert Village How to inspect an ignition coil. Which gave me the idea to check for a bad ignition coil by simple removing two wires from the top of one ignition coil then starting the car (making the car run on 4cylinders instead of 6) and watch the electricity Arch from one post to the next in a back and forth motion .(pretty cool to see and hear but not a recommended way of checking ) did the same thing to the other two coils and found one coil that didn't Arch. Swap the ignition coil with a brand new one for bout 40 bucks and Presto! It Works! Good as New.

- , Romeoville, IL, USA

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