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I need help with a misfire problem

I get a misfire between 2000 & 3000 rpm. Vortec v 6 4.3. The truck will not maintain speed in this RPM range in any gear.

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: RPM range for 95 nissan 2.4L truck

install an aftermarket tach?

Posted on Nov 24, 2008

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SOURCE: 2003 Crown Vic Misfiring after acceleration

I just came up with that exact issue in my 2003 with 98K police crown vic. And the last time I had this issue in a 2001 police Crown vic it was the crank shaft position sensor. A $20 part and about 30 mins to put it in. located near the bottom of the engine. I had to un bolt the A/C compressor and push it out of the way a few inches to get to the sensor. If you have about 100K mile on it and its an idled heavy police car, this sensor should be changed out anyway. It can leave you on the road dead and some dealers have a hard time find out whats wrong as the OBD 2 does not see it as a problem when it goes bad or becomes touchy as I think mine is.

Posted on Jan 12, 2009

  • 15 Answers

SOURCE: High Idle speed on 1989 Merc Sable, 3.0L V-6. Approx 2000 RPM

My wife had a 93 ford tempo 4 cylinder with same problem.It turned out to be the idle air solenoid mounted on the air intake manifold.

Posted on Jan 17, 2009

  • 110 Answers

SOURCE: High rpm at cruising

good afternoon and welcome to fixya
what speed are you listing as cruising speed? this will help alot.
let me know so we can get you figured out

Posted on Mar 11, 2009

  • 1 Answer

SOURCE: 05 ford f150 shaking when turn on

replace coils to misfired cyls

Posted on Oct 26, 2009

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After service my Mazda etude16 valve engine,the car misfires and drives stable in high speed but I'm low gears it has no power.


You don't say what year it is, but some have an ignition module with two or more sections for different rpm ranges. The later models may have variable cam timing and if this fails in high rpm mode it will cause this too.

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Why does my 1998 gmc jimmy rpm drop so low when its warm causing a miss in the engine


The truck ECM computer controls the idle speed based on a number of engine parameters. Idle drops to a minimum preset level when engine coolant reaches normal operating range and the engine goes into closed loop control. This idle is typically set at around 575 rpm, and cannot be changed without reprogramming the ECM. The miss is not caused by the idle speed - unless the engine is tuned properly and has not lost compression, this idle speed can result in a rough running engine at idle (typical with older 4.3L Vortec engines). Best bet is to get a complete tuneup which will include checking the O2 sensors, catalytic converter and cleaning the IAC valve and throttle body.

May 20, 2014 | 1998 GMC Jimmy

1 Answer

RUNS ROUGH AT MID RPM


Need to be more specific here. Runs rough...like misfiring? or vibrating excessively at about 1500, and again about 3000 rpm? If it's the latter, chances are your engine's balance shaft is not timed correctly. This causes a heavy high-frequency vibration/buzz throughout the car, at the aforementioned rpm ranges. If it's more like a misfire/stumble, look into your ignition system, or possibly a sticking EGR valve. (This will cause a mild surge/bucking under light accel, peaking between 45-50mph. Good luck!

Apr 07, 2014 | 1997 Honda Accord

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What does obd code p0301 on 2002 pt cruiser mean?


Trouble Code: P0301

Cylinder No. 1, 2, 3 or 4 Misfire Detected

Trouble Code Conditions: Engine is running; atmospheric pressure, fuel level, battery voltage, engine speed, engine load are above minimal predetermined specifications; the engine is not in fuel cutoff and intake air temperature and coolant temperature are within normal operating ranges; there are no DTCs relating to ECT, CMP, CKP, MAP or IAT Sensor, to Crank rationality, to Crank Sensor Learn invalid, or to System Voltage. If total misfires detected are greater than 7% during the first 1000 rpm, or are over 3% after the first 1000 rpm, or are 25% during any 200 rpm with suspect cylinder misfire counter more than 80% and no other cylinder misfire counters above 80%, this DTC will set. The MIL will flash after first trip occurrence and will be steady after second trip.

Possible Causes:


Fuel system problems existErratic CMP or CKP Sensor signalsIgnition system problems existEngine mechanical problems existPCM has failed

Jan 29, 2013 | 2002 Chrysler PT Cruiser

1 Answer

Car stutters at 2000 rpm range and has a hard time starting when warm


Well, If you have changed all of the above the only thing left is the cat. converter. If they are stopped up the engine will shut down to protect itself, it can't breathe. Look under car and see the cat. converter? Is it purple? kick it and see if it rattles.

Jun 05, 2017 | Chevrolet Monte Carlo Cars & Trucks

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Vehicle unused with dead battery for 6 months will start but not maintain idle


The automatic idle speed control system has lost its adaptive idle learning due to the dead battery. To help to correct this in the short term run the engine at 2000 RPM until warm, then back down to 1500 RPM for 3 minutes, then 1000 RPM for 3 minutes, then let it idle for 5 minutes, this should get the system to a point in the idle learn that it doesn't stall out, then drive it for 20 miles under varied conditions of highway and stop and go and low speed operation, that should get all to work again. If you still have problems you will need to have the system scanned to see what is going on that is causing a stall. Also add fresh fuel, gas goes bad in about 3 months. Use the recommended grade of fuel.

Jan 20, 2012 | 2001 Mitsubishi Montero

1 Answer

Using more rpm to maintain speed than before, cat converter and o2 sensor replaced within 6 months but peoblem showed up approx 2 months after r&r of parts, ran fuel treatment of injectors & fuel...


If the RPM is higher at any particular speed than before, the only cause could be that the transmission is slipping. Things like O2 sensors, Catalytic converters, fuel treatments, etc. have absolutely nothing to do with incresed engine (input) speed to axle (output) speed ratios.

Aug 06, 2011 | 2005 Toyota Camry Solara

1 Answer

My 95 nissan is bucking and having acceleration loss. And shes so stubborn that she can't maintain the same speed. Also when she idles she fluxuates from half an rpm to 1 rpm. Does anyone know where to...


it is most likely the throttle position sensor. it could be mass airflow sensor. are there any codes? best bet get it scoped and see which sensors out of range.

Feb 12, 2011 | 1995 Nissan Pathfinder

1 Answer

2003 B3000 v-6 idles rough but does not stall and runs well at highway speeds


Try turning on the ac or turning the steering. The increased load on the engine should lower the the rpm. If the Idle Air Control valve is working correctly it should sense the load and maintain the rpm or even increase it a bit.. Also this should be cover under warrenty.

Jul 30, 2009 | 2007 Mazda B3000

2 Answers

Stick shift # Automatic RPM


That is normal,If you do the same speed in 4th gear the rpm's will almost double.

The rpm's will repond faster in a manual than an automatic.

In a manual the engine supplies the power required directly to the gear that you have selected thus the engine rpm's will increase or decrease as needed.

Jan 07, 2009 | 2002 Nissan Altima

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