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Misfire during acceleration - Cars & Trucks

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  • ANDY GOH GIN HOONG
    ANDY GOH GIN HOONG Dec 07, 2014

    Hi Dennis Randolph, I want to help you with your question, but I need more information from you. Can you please add details in the comment box?

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Check ignition system for faults. A good tune-up will usually remedy this type of problem.

Posted on Dec 09, 2014

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Misfiring on bank 1 3 and 5


misfiring is also from injectors and low fuel pressure. To be all on the same side I suspect injector wiring ( possible loose connection on the ECM). Have a compression test done to delete mechanical problems (valves)

Mar 05, 2014 | Cars & Trucks

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I changed the spark plugs and now it's misfiring


The plug wires may have been damaged during the plug change

Jun 08, 2013 | Cars & Trucks

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While merging onto the highway when my car hit 3 and 4th gear the engine seemed to "stutter/misfire" during harder acceleration. Check engine light also flashed briefly during hard acceleration. Dur


Could be a transmission problem or something as simple as bad spark plugs.
The engine is under the most load when RPM is low and you are trying to accelerate, such as when it upshifts.
You should have the computer checked for trouble codes and hopefully that will point you in the right direction to test.
If the spark plugs have more than 50,000 miles of wear you might start with replacing them.

Feb 06, 2013 | 2008 Saturn Astra

1 Answer

What is the drive cycle for a 1999 vw jetta


The drive cycle is as follows
For all OBD2 VW's

OBD-II Drive Cycle Stages
The OBD-II Drive Cycle is an eight-stage course, as illustrated in the
chart on page 3. An explanation of each step is provided below.
Stage 1: Cold Start-The ECM determines the presence of a cold start
by comparing the engine coolant temperature to the ambient air
temperature during startup. The engine is considered cold when:
• Engine coolant temperature is below 122°F (50°C).
• Engine coolant and intake air temperatures are within 11°F (6°C) of
each other at startup.
During this period, the O2S heater, misfire, AIR, fuel system, and EVAP
monitors run.

Stage 2: Idle 2½ Minutes-Turn the air conditioning (A/C) and
headlights on to help the misfire monitor-the additional electrical loads
help even out combustion pulses. During this period, the O2S heater,
AIR, EVAP, misfire, and possibly fuel system (if operating in closed loop)
monitors run.

Stage 3: Accelerate-Prior to accelerating, turn off the A/C and
headlights (if possible). Open the throttle halfway until you reach
55 MPH (89 KPH). During acceleration, the misfire, fuel system, and
EVAP monitors run.

Stage 4: Steady State Cruise-During this portion of the cycle, the
O2S, AIR, EGR, EVAP, misfire, and fuel system monitors run.

Stage 5: Decelerate-Gradually coast down without applying the
brakes. Also, on manual transmission vehicles, remain in high gear and
do not press the clutch. During this period, the EGR, EVAP, and fuel
system monitors run.

Stage 6: Accelerate-Apply ¾ throttle until reaching 60 MPH (97 KPH).
During acceleration, the misfire, fuel system, and EVAP monitors run.

Stage 7: Steady State Cruise-During this period, the CAT, O2S, AIR,
EGR, EVAP, misfire, and fuel system monitors run.

Stage 8: Decelerate-Gradually coast down without applying the
brakes. Also, on manual transmission vehicles, remain in high gear and
do not press the clutch. During this portion of the Drive Cycle, the EGR,
EVAP, and fuel system monitors run.

You can try this a couple times, but if it doesn't work you should go to a VW specialty shop like the dealer or a shop that does mostly European cars and they can use the scan tool to force the car through readiness.


Oct 11, 2010 | 1999 Volkswagen New Jetta

1 Answer

Multilpe misfires during rapid acceleration from 10mph to about 70mph


Most often when an engine idles fine, but misfires under a load, the problem is spark plug wires. I suggest that's where you start.

Apr 21, 2010 | 1998 Chevrolet K1500

1 Answer

Engine code giving misfire on 4 o 5 and P1521 oil contamination


check cam sensor,if the timing isn't adjusting with acceleration then you would have noticable power loss

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2 Answers

2002 Ford Taurus SEL, DOHC Misfiring


Disconnect the battery completely, try turning the key with the battery disconnected. Put the battery back together. The check engine light should be off now..

Jan 31, 2009 | 2002 Ford Taurus

1 Answer

2004 dodge caravan 2.4 Hesitates during Acceleration and at idele


You should definitely replace the fuel filter though this probably won't fix your hesitation. It wouldn't hurt to replace the spark plugs this is usually the culprit on these engine. I have the same engine in a '99 caravan and found the for some reason the spark plugs on cylinder 3 and 4 loosen up after one year and cause a misfire between 45 and 50 mph under load (when mildly accelerating).

Jan 06, 2009 | 2004 Dodge Caravan

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