Question about 1993 Buick Riviera

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1993 buick riviera miss in engine loses power on inclines has ruff idle. Replaced 2 coil packs, fuel filter, and the PCM. Still having the problem

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  • 444 Answers

Change the spark plugs end wires. One bad plug or a wire can cause a miss like you wouldn,t belive. Evan on a vehicle with low miles on it.

Posted on Oct 27, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

greg_margo
  • 1959 Answers

SOURCE: engine misses at 35 mph code po 304 coil pack plug wire replaced

Information courtesy of http://obd-codes.com

A code P0304 may mean that one or more of the following has happened:

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor (s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
Possible Solutions If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Hope this helps with your problem. Best of luck.
Greg

Posted on May 21, 2009

Blackberry_U
  • 223 Answers

SOURCE: 1993 Buick Century Custom 3.3L Runs Rich, Ruff at idle; 10MPG

Check the fuel filter, it might be clogged.

Posted on Jun 15, 2009

  • 23 Answers

SOURCE: 1990 Buick is cranking but not starting. replaced

Need to know if there is a spark? If there is a spark check the modular which is behind the coil pack

Posted on Jul 12, 2009

  • 784 Answers

SOURCE: My 1993 buick lesabre limited is losing power

I think the compression pressure from each cylinder needs to be checked. There are built-up carbon residues around valve seats causing poor compression hence losing power under load. If this is a case then only a valve job could improve the situation. Depending on the mileage, worn out piston rings could contribute to the reduction of compression ratio, but it can be determined at the time of the valve job. Good luck. 

Posted on Oct 11, 2009

TDISLine
  • 1874 Answers

SOURCE: i have a 92 buick

If everything seems to be all right with the ignition & fuel systems, then you need to perform an engine compression test. The air pressure should be around 210 psi ... 175 psi. Minimum air pressure value = 150 psi. The most important thing is that the difference of air pressure between cylinders
If the engine compression test will be all right, then you need to scan the Engine Control Module (ECM) using a diagnostic scantool connected to the data link connector of the car in order to find out all Diagnostic Trouble Codes (DTC) memored. It's possible to find bad oxygen sensor, weared catalytic converter, ....

Posted on Oct 17, 2010

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The code reads: ignition coil #1 primary circuit. If the coil pack has been replaced, then it is likely the PCM (computer package) is defective and needs to be replaced. That circuit is driven directly by the PCM. This information was taken from a '96 Dodge Caravan service manual (3.3 V6 engine with coil pack ignition system), and should be similar. If your engine uses a distributor instead of a coil pack, then the above code doesn't apply. Even if it does apply, the code implies a 'miss' situation, not complete engine stoppage unless the computer operates the 'automatic shut down relay'??

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have you swap the fuel filter it might just be a dirty one or maybe your air filter hose might have a puncture in the air boot

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if you have fuel and no spark try the crank sensor

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