Question about 1993 Pontiac Bonneville

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Loping engine The engine lopes and stutters along the road for the first 5-10 mins and then acts normally. However, I am seeing a lack of power when accelerating from 50-75 mph range. Fuel pump replaced Fuel Filter replace Spark plugs replaced new wires for spark plugs installed.

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  • Pontiac Master
  • 9,587 Answers

Try cleaning the mass air flow meter. There;s a spray cleaner you can get at an auto parts store

Posted on Dec 06, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

polarcycle
  • 1392 Answers

SOURCE: 1999 pontiac grand prix gt 3.8L v6 cranks wont start

Is the security light on? If you have spark and fuel, it should run. Any codes? Could be bad crank sensor or cam sensor.

Posted on Mar 07, 2009

garputo22
  • 127 Answers

SOURCE: CAR WILL NOT START EVEN THO FUEL FILTER,SPARK

crankshaft position sensor is the issue

Posted on Jun 05, 2009

  • 2 Answers

SOURCE: Fiero Engine is spitting

Try replacing the Idle Air Control Valve. If that does not work (which it should) try fixing the Throttle Postion Sensor.

Posted on Aug 03, 2009

duane_wong
  • 6826 Answers

SOURCE: 1997 pontiac grand prix gt stutters on take off

Check the coil packs and EGR:
Exhaust Gas Recirculation System Operation Application of the Exhaust Gas Recirculation (EGR) gases is regulated by the Powertrain Control Module (PCM). It is based on engine coolant temperature, engine speed, vehicle speed, throttle angle and Manifold Absolute Pressure (MAP). The operation of the EGR system is monitored by the PCM, which allows gases to flow at a calculated rate and compares it against MAP sensor and oxygen sensor activity. The PCM anticipates an increase in MAP voltage and an increase in O2 sensor voltage.
Electrically operated vacuum control solenoids used to control the flow of vacuum to the EGR valve, rely on pulse-width duty cycle commands from the PCM to control its operation. Using input values and the operating conditions previously mentioned the PCM completes the electrical circuit for the solenoid to allow vacuum operation of the EGR.
In addition to solenoids controlling vacuum flow, the incorporation of a back pressure transducer regulates vacuum signals independently of electrical signals. When back pressure in the exhaust system is low, the transducer pintle is open and manifold vacuum is allowed to bleed off. As back pressure increases the amount of vacuum allowed to bleed off is reduced resulting in more vacuum being applied to the valve. This allows air pressure to open the valve.
The following symptoms can be caused by a faulty EGR valve due to loose connection, bad grounds, high resistance in the circuit, or opens in the circuit.
Related Symptoms

  • Stalling on deceleration
  • Stall at idle
  • Surging off idle
  • Unstable idle
  • Running rough off idle
  • Hesitation
  • Stumble
  • Chuggle
  • Low idle
  • Poor fuel economy
  • Spark knock
  • Stalling on acceleration
---
coil packs:
Diagnosis and Testing Secondary Spark Test These spark tester looks just like a spark plug, attach the clip to ground and crank the engine to check for spark 91052p10.jpg
This spark tester has an adjustable air-gap for measuring spark strength and testing different voltage ignition systems 91052p11.jpg
Attach the clip to ground and crank the engine to check for spark 91052p12.jpg
This spark tester is the easiest to use just place it on a plug wire and the spark voltage is detected and the bulb on the top will flash with each pulse 91052p10.jpg
The best way to perform this procedure is to use a spark tester (available at most automotive parts stores). Three types of spark testers are commonly available. The Neon Bulb type is connected to the spark plug wire and flashes with each ignition pulse. The Air Gap type must be adjusted to the individual spark plug gap specified for the engine. The last type of spark plug tester looks like a spark plug with a grounding clip on the side, but there is no side electrode for the spark to jump to. The last two types of testers allows the user to not only detect the presence of spark, but also the intensity (orange/yellow is weak, blue is strong).
  1. Disconnect a spark plug wire at the spark plug end.
  2. Connect the plug wire to the spark tester and ground the tester to an appropriate location on the engine.
  3. Crank the engine and check for spark at the tester.
  4. If spark exists at the tester, the ignition system is functioning properly.
  5. If spark does not exist at the spark plug wire, perform diagnosis of the ignition system using individual component diagnosis procedures.
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Posted on Jul 13, 2010

  • 1596 Answers

SOURCE: 1995 pontiac firebird ,I replaced

Your OIL Pressure Sensor Serves as A Protection Device Along with its Primary Purpose, If It Sesces NO OIL PRESSURE >> (Or it Malfunctions) It WILL NOT Provide the GROUND that the FUEL PUMP RELAY Or Fuel PUMP REQUIRE to Turn ON the Fuel PUMP, To Check this Disconnect the Sensor and LOACTE the KEY ON POSITIVE WIRE of the 3 WIRES on It>> K THIS WIRE DO NOT BOTHER it Identifie it & MARK IT)) and Use the Other 2 Wires>. JUMPER Wire Accross the 2 Remaining Wires on this Sensor PLUG This Should Cause the Fuel Pump RELAY to CLICK Thus GROUNDING the Relsy Allowing it to Provide ground Resulting in POWER to FUEL PUMP. If This Jumper Procedure Works REPLACE the 3 Wire OIL SENDING UNIT Some have 2 an you ONLY NEED the 1. I am Sure this Has and WIll Give you MORE INSIGHT On this System and Help you get it Running. Have a GOOD DAY !!

Posted on Aug 17, 2010

Testimonial: "i am going to my garage to try it now,will reply if it works, thanks."

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